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Bao Y, Qi Y, Li Q, Wang L, Cao Z, Li J, Wu M, Chen J, Zhang H, Guo Q, Jiang B, Zhong J, Li J. Fluoride removal from coal mining water using novel polymeric aluminum modified activated carbon prepared through mechanochemical process. J Environ Sci (China) 2024; 146:226-236. [PMID: 38969450 DOI: 10.1016/j.jes.2023.07.041] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2023] [Revised: 07/26/2023] [Accepted: 07/31/2023] [Indexed: 07/07/2024]
Abstract
Defluoridation of coal mining water is of great significance for sustainable development of coal industry in western China. A novel one-step mechanochemical method was developed to prepare polymeric aluminum modified powder activated carbon (PAC) for effective fluoride removal from coal mining water. Aluminum was stably loaded on the PAC through facile solid-phase reaction between polymeric aluminum (polyaluminum chloride (PACl) or polyaluminum ferric chloride (PAFC)) and PAC (1:15 W/W). Fluoride adsorption on PACl and PAFC modified PAC (C-PACl and C-PAFC) all reached equilibrium within 5 min, at rate of 2.56 g mg-1 sec-1 and 1.31 g mg-1 sec-1 respectively. Larger increase of binding energy of Al on C-PACl (AlF bond: 76.64 eV and AlFOH bond: 77.70 eV) relative to that of Al on C-PAFC (AlF bond: 76.52 eV) explained higher fluoride uptake capacity of C-PACl. Less chloride was released from C-PACl than that from C-PAFC due to its higher proportion of covalent chlorine and lower proportion of ionic chlorine. The elements mapping and atomic composition proved the stability of Al loaded on the PAC as well as the enrichment of fluoride on both C-PACl and C-PAFC. The Bader charge, formation energy and bond length obtained from DFT computational results explained the fluoride adsorption mechanism further. The carbon emission was 7.73 kg CO2-eq/kg adsorbent prepared through mechanochemical process, which was as low as 1:82.3 to 1:8.07 × 104 compared with the ones prepared by conventional hydrothermal methods.
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Affiliation(s)
- Yixiang Bao
- State Key Laboratory of Water Resource Protection and Utilization in Coal Mining, National Institute of Clean and Low Carbon Energy, Beijing 102209, China
| | - Yonghui Qi
- School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
| | - Qiao Li
- State Key Laboratory of Water Resource Protection and Utilization in Coal Mining, National Institute of Clean and Low Carbon Energy, Beijing 102209, China
| | - Lei Wang
- China Coal Society, Chaoyang District, Beijing 100013, China
| | - Zhiguo Cao
- State Key Laboratory of Water Resource Protection and Utilization in Coal Mining, National Institute of Clean and Low Carbon Energy, Beijing 102209, China
| | - Jie Li
- Guoneng Shendong Coal Technology Research Institute, Yulin 719315, China
| | - Min Wu
- State Key Laboratory of Water Resource Protection and Utilization in Coal Mining, National Institute of Clean and Low Carbon Energy, Beijing 102209, China
| | - Jun Chen
- Bulianta Coal Mine, Shendong Coal Group Co. Ltd., Erdos 017209, China
| | - Haiqin Zhang
- State Key Laboratory of Water Resource Protection and Utilization in Coal Mining, National Institute of Clean and Low Carbon Energy, Beijing 102209, China
| | - Qiang Guo
- State Key Laboratory of Water Resource Protection and Utilization in Coal Mining, National Institute of Clean and Low Carbon Energy, Beijing 102209, China
| | - Binbin Jiang
- State Key Laboratory of Water Resource Protection and Utilization in Coal Mining, National Institute of Clean and Low Carbon Energy, Beijing 102209, China
| | - Jinkui Zhong
- State Key Laboratory of Water Resource Protection and Utilization in Coal Mining, National Institute of Clean and Low Carbon Energy, Beijing 102209, China
| | - Jingfeng Li
- State Key Laboratory of Water Resource Protection and Utilization in Coal Mining, National Institute of Clean and Low Carbon Energy, Beijing 102209, China.
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Xie S, Xiao Y, Huang L, Li J, Yan J, Li Q, Li M, Zhang H. The Constructing of the Oxide Phase Diagram for Fluoride Adsorption on La-Fe-Al: A Collaborative Study of Density Functional Calculation and Experimentation. NANOMATERIALS (BASEL, SWITZERLAND) 2024; 14:619. [PMID: 38607153 PMCID: PMC11013458 DOI: 10.3390/nano14070619] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2024] [Revised: 03/24/2024] [Accepted: 03/30/2024] [Indexed: 04/13/2024]
Abstract
In recent years, fluoride pollution in water is a problem that has attracted much attention from researchers. The removal of fluoride-containing wastewater by adsorption with metal oxide as an adsorbent is the most common treatment method. Based on this, the effect of the doping ratio of La2O3, Fe2O3, and Al2O3 on the fluoride-removal performance was discussed by constructing a phase diagram. In this study, the adsorption mechanism of nanocrystalline lanthanum oxide terpolymer was investigated by density functional theory calculation and experiment. The optimal pH condition selected in the experiment was three, and the adsorption kinetics of fluoride ions were more consistent with the quasi-second-order kinetic model. The adsorption thermodynamics was more consistent with the Langmuir model. When the La-Fe-Al ternary composite oxides achieved the optimal adsorption efficiency for fluoride ions, the mass synthesis ratio was Al2O3:(Fe2O3:La2O3 = 1:2) = 1:100, resulting in a fluoride ion removal rate of up to 99.78%. Density functional calculations revealed that the La-Fe-Al ternary composite oxides had three important adsorption sites for La, Fe, and Al. Among them, the adsorption capacity for HF was Fe2O3 > La2O3 > Al2O3, and for F- was La2O3 > Al2O3 > Fe2O3. This provided good guidance for designing adsorbents to remove fluoride.
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Affiliation(s)
- Shaojian Xie
- School of Environmental Science and Engineering, Guangzhou University, Guangzhou Higher Education Mega Center, Guangzhou 510006, China; (S.X.); (Y.X.); (J.L.); (J.Y.); (Q.L.); (M.L.)
| | - Yao Xiao
- School of Environmental Science and Engineering, Guangzhou University, Guangzhou Higher Education Mega Center, Guangzhou 510006, China; (S.X.); (Y.X.); (J.L.); (J.Y.); (Q.L.); (M.L.)
| | - Lei Huang
- School of Environmental Science and Engineering, Guangzhou University, Guangzhou Higher Education Mega Center, Guangzhou 510006, China; (S.X.); (Y.X.); (J.L.); (J.Y.); (Q.L.); (M.L.)
| | - Jiaxin Li
- School of Environmental Science and Engineering, Guangzhou University, Guangzhou Higher Education Mega Center, Guangzhou 510006, China; (S.X.); (Y.X.); (J.L.); (J.Y.); (Q.L.); (M.L.)
| | - Jia Yan
- School of Environmental Science and Engineering, Guangzhou University, Guangzhou Higher Education Mega Center, Guangzhou 510006, China; (S.X.); (Y.X.); (J.L.); (J.Y.); (Q.L.); (M.L.)
| | - Qian Li
- School of Environmental Science and Engineering, Guangzhou University, Guangzhou Higher Education Mega Center, Guangzhou 510006, China; (S.X.); (Y.X.); (J.L.); (J.Y.); (Q.L.); (M.L.)
| | - Meng Li
- School of Environmental Science and Engineering, Guangzhou University, Guangzhou Higher Education Mega Center, Guangzhou 510006, China; (S.X.); (Y.X.); (J.L.); (J.Y.); (Q.L.); (M.L.)
| | - Hongguo Zhang
- School of Environmental Science and Engineering, Guangzhou University, Guangzhou Higher Education Mega Center, Guangzhou 510006, China; (S.X.); (Y.X.); (J.L.); (J.Y.); (Q.L.); (M.L.)
- Guangzhou University-Linköping University Research Center on Urban Sustainable Development, Guangzhou University, Guangzhou 510006, China
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Zeng Z, Li Q, Yan J, Huang L, Arulmani SRB, Zhang H, Xie S, Sio W. The model and mechanism of adsorptive technologies for wastewater containing fluoride: A review. CHEMOSPHERE 2023; 340:139808. [PMID: 37591373 DOI: 10.1016/j.chemosphere.2023.139808] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2023] [Revised: 08/06/2023] [Accepted: 08/11/2023] [Indexed: 08/19/2023]
Abstract
With the continuous development of society, industrialization, and human activities have been producing more and more pollutants. Fluoride discharge is one of the main causes of water pollution. This review summarizes various commonly used and effective fluoride removal technologies, including ion exchange technology, electrochemical technology, coagulation technology, membrane treatment, and adsorption technology, and points out the outstanding advantages of adsorption technology. Various commonly used fluoride removal techniques as well as typical adsorbent materials have been discussed in published papers, however, the relationship between different adsorbent materials and adsorption models has rarely been explored, therefore, this paper categorizes and summarizes the various models involved in static adsorption, dynamic adsorption, and electrosorption fluoride removal processes, such as pseudo-first-order and pseudo-second-order kinetic models, Langmuir and Freundlich isotherm models, Thomas and Clark dynamic adsorption models, including the mathematical equations of the corresponding models and the significance of the models are also comprehensively summarized. Furthermore, this comprehensive discussion delves into the fundamental adsorption mechanisms, quantification of maximum adsorption capacity, evaluation of resistance to anion interference, and assessment of adsorption regeneration performance exhibited by diverse adsorption materials. The selection of the best adsorption model not only predicts the adsorption performance of the adsorbent but also provides a better description and understanding of the details of each part of the adsorption process, which facilitates the adjustment of experimental conditions to optimize the adsorption process. This review may provide some guidance for the development of more cost-effective adsorbent materials and adsorption processes in the future.
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Affiliation(s)
- Zhen Zeng
- School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510006, China
| | - Qian Li
- School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510006, China
| | - Jia Yan
- School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510006, China
| | - Lei Huang
- School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510006, China.
| | - Samuel Raj Babu Arulmani
- Université de Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes), Campus de Beaulieu, 35000, Rennes, France
| | - Hongguo Zhang
- School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510006, China; Guangzhou University-Linköping University Research Center on Urban Sustainable Development, Guangzhou University, Guangzhou, 510006, China.
| | - Shaojian Xie
- School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510006, China
| | - Wenghong Sio
- Institute of Applied Physics and Materials Engineering, University of Macau, Macao SAR, 999078, China
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Zheng M, Wang J, Fu D, Ren B, Song X, Kan K, Zhang X. Anchored growth of highly dispersed LDHs nanosheets on expanded graphite for fluoride adsorption properties and mechanism. JOURNAL OF HAZARDOUS MATERIALS 2023; 442:130068. [PMID: 36303341 DOI: 10.1016/j.jhazmat.2022.130068] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2022] [Revised: 09/20/2022] [Accepted: 09/23/2022] [Indexed: 06/16/2023]
Abstract
In this study, a new composite with layered double hydroxides (LDHs) anchored grown on expanded graphite (EG) interlayers was prepared by vacuum-assisted intercalation and hydrothermal method. Both sides of EG were completely covered by highly dispersed LDHs nanosheets and formed a sandwich-like structure. The unique structure made expanded graphite/layered double hydroxides (EG/LDHs) composites which had excellent F- adsorption performance. The adsorption performance of F- on EG/LDHs was evaluated, and the results indicated that the adsorption process was consistent with the pseudo-second-order kinetic model and the Langmuir model. Pseudo-second-order kinetic model indicated that the adsorption sites were the main factor in the adsorption process. Moreover, the maximum adsorption capacity (Qm) reached 63.21 mg·g-1 at 30 min at room temperature, which was better than most of the same type of adsorbents. The highly dispersed of LDHs anchored growth on EG overcame the disadvantage of aggregation, which exposed more adsorption sites and improved the removal efficiency of F-. In addition, the effects of pH, anion interference, different water quality, and regeneration tests on the EG/LDHs composites were also analyzed, showing that the composites have good stability.
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Affiliation(s)
- Mingming Zheng
- Heilongjiang Academy of Sciences, Institute of Advanced Technology, Harbin 150020, PR China
| | - Jue Wang
- Heilongjiang Academy of Sciences, Institute of Advanced Technology, Harbin 150020, PR China
| | - Dong Fu
- Heilongjiang Academy of Sciences, Institute of Advanced Technology, Harbin 150020, PR China
| | - Binqiao Ren
- Heilongjiang Academy of Sciences, Institute of Advanced Technology, Harbin 150020, PR China
| | - Xiaoxiao Song
- Heilongjiang Academy of Sciences, Institute of Advanced Technology, Harbin 150020, PR China
| | - Kan Kan
- Heilongjiang Academy of Sciences, Institute of Advanced Technology, Harbin 150020, PR China.
| | - Xiaochen Zhang
- Heilongjiang Academy of Sciences, Institute of Advanced Technology, Harbin 150020, PR China.
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Mahajan T, Paikaray S. Fluoride retention kinetic and equilibrium studies on layered double hydroxides under ambient conditions: Implications on pond-stream-hot spring-well water remediation. WATER ENVIRONMENT RESEARCH : A RESEARCH PUBLICATION OF THE WATER ENVIRONMENT FEDERATION 2022; 94:e10804. [PMID: 36346371 DOI: 10.1002/wer.10804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2022] [Revised: 09/19/2022] [Accepted: 10/09/2022] [Indexed: 06/16/2023]
Abstract
Fluoride deficiency and toxicity severely affect a large population globally. Hence, a low-cost geosorbent is in demand to overcome fluorosis hazards where in situ retardation is prioritized over pilot-scale waste water treatment. This study reports the fluoride removal potential of MgFe-type layered double hydroxide (HT-LDH) and its calcined form at 500 and 800°C for their usability for treatment of polluted streams, ponds, wells, and hot spring water. Rapid uptake with >33% removal in 24 h was found by the adsorptive method, whereas the co-precipitation process removed >16 mg/L (>83%) in 1 h. The efficiency was further enhanced upon calcination at 500°C with >95% removal up to five times regeneration, unlike that at 800°C. It was demonstrated that multilayer sorption onto heterogeneous surface sites is majorly controlled by surface adsorptive and ion exchange mechanisms. Acidic pH, low aqueous F - , and temperature >25°C favored greater uptake, whereas competitive anions slightly enhanced its potential in the order N O 3 - > S O 4 2 - > P O 4 3 - in adsorptive removal. In the co-precipitation process, competing anions slightly hindered F - retention, whereas high temperature and low aqueous F - led to greater F - retention. No F-bearing solid phases were evidenced upon its retention, except lowering the HT-LDH crystallinity and rearrangement of C O 3 2 - surface functional groups. The fluoride contents of natural water were lowered drastically up to 77% in 60 min upon precipitation of HT-LDH by maintaining alkalinity and a di-/trivalent cationic ratio of 2.0. PRACTITIONER POINTS: F^- uptake is rapid on heterogeneous surface sites with multilayer sorption mechanism Greater F^- removed by coprecipitation technique compared with adsorptive pathway Acidic medium and temperature >25°C favor greater F^- retention NO_3^-+PO_l4^(3-) slightly enhanced F^- uptake by adsorption but lowered in coprecipitation Formation of LDH from natural waters lowered F^- content up to <77.
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Affiliation(s)
- Tanuj Mahajan
- Environmental Geochemistry Group, Department of Geology, Panjab University, Chandigarh, India
| | - Susanta Paikaray
- Environmental Geochemistry Group, Department of Geology, Panjab University, Chandigarh, India
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Synthesis of stable flowerlike MgAl-LDH@MIL-88A and its adsorption performance for fluoride. JOURNAL OF CHEMICAL RESEARCH 2022. [DOI: 10.1177/17475198221106680] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
MgAl-LDH@MIL-88A as an effective adsorbent was successfully prepared by a simple stirring method in water bath through loading MIL-88A onto the surface of flowerlike MgAl-LDH, which was synthesized via solvothermal method. Interestingly, the results of characterizations showed that the MIL-88A could still grow, but extrude the brucite-like layers of MgAl-LDH. The influences of initial solution pH, contact time, temperature, and co-existing ions on the adsorption performance of MgAl-LDH@MIL-88A were studied systematically by batch static adsorption experiments. It was found that MgAl-LDH@MIL-88A represented the highest adsorption loading of fluoride (14.00 mg g−1) at initial pH 7.0 in 420 min. The uptake process was described appropriately by the pseudo-second-order, the Temkin and the Freundlich isotherm models. The thermodynamic parameters confirmed the endothermic and spontaneous nature of adsorption. MgAl-LDH@MIL-88A was the green adsorbent as the residual mental contents ([Mg2+] = 1.095 mg L−1, [Fe3+] = 0.007 mg L−1, [Al3+] = 0.076 mg L−1) after adsorption met the Chinese sanitary standard for drinking water (GB 5749-2006). The mechanism of fluoride removal by MgAl-LDH@MIL-88A involved the electrostatic interactions between Fe3+ of MIL-88A and fluoride, and ligand exchange among hydroxyl groups of MgAl-LDH, carboxylate groups of the C4H4O4 and fluoride.
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Adusei JK, Agorku ES, Voegborlo RB, Ampong FK, Danu BY, Amarh FA. Removal of Methyl red in aqueous systems using synthesized NaAlg-g-CHIT/nZVI adsorbent. SCIENTIFIC AFRICAN 2022. [DOI: 10.1016/j.sciaf.2022.e01273] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022] Open
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Ren C, Wang H, Ji J, Li W. Molecular scale assessment of defluoridation of coal-mining wastewater by calcined Mg/Al layered double hydroxide using 19F solid-state NMR, XPS, and HRTEM. CHEMOSPHERE 2022; 303:135072. [PMID: 35618073 DOI: 10.1016/j.chemosphere.2022.135072] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Revised: 05/12/2022] [Accepted: 05/20/2022] [Indexed: 06/15/2023]
Abstract
Calcination is an effective way to improve the F- adsorption capacity of layered double hydroxide (LDH) materials, however, a molecular scale understanding of the enhanced defluoridation capability of calcined LDHs (CLDH) is lacking. This study investigated the mechanisms of F- adsorption by CLDH using 19F solid-state NMR, X-ray photoelectron spectroscopy (XPS), and high-resolution TEM. Under calcination process, LDH underwent three periods: surface dehydration below 200 °C, structural dehydroxylation at 200-400 °C, and release of interlayer carbonate groups above 400 °C. Additionally, XPS and XRD characterization showed that CLDH could not recover to the original structural symmetry even after rehydration and reconstitution. The F- affinity was greatly enhanced for the calcined LDH, especially at high pH. At pH 10, the adsorption capacity could reach 22.0 mg F-/g for CLDH (500 °C calcined), about 6 times larger than that of LDH. The XRD analyses revealed that the F-adsorbed CLDH had a poorer crystalline degree as the calcination temperature increased, consistent with the TEM observation of abundant defects and Mg/Al oxides on the CLDH sheets. 19F solid-state NMR spectra of the CLDH after F- adsorption showed that the formation of surface Al-F is the predominant F- adsorption mode at pH 7, whereas the Mg-F local coordination mode is the pronounced F- adsorption mechanism under alkaline conditions (pH 10). The present study provided a comprehensive understanding of CLDH in F- adsorption and suggested that calcination is a promising treatment for promoting the efficacy of polluted anion scavenging.
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Affiliation(s)
- Chao Ren
- Key Laboratory of Surficial Geochemistry, Ministry of Education, School of Earth Sciences and Engineering, Nanjing University, 163 Xianlin Road, Nanjing, 210023, China; Research Center for Environmental Nanotechnology (ReCENT), Nanjing University, 163 Xianlin Road, Nanjing, 210023, China; Frontiers Science Center for Critical Earth Material Cycling (FSC-CEMaC), Nanjing University, Nanjing, 210023, China
| | - Hongtao Wang
- Key Laboratory of Surficial Geochemistry, Ministry of Education, School of Earth Sciences and Engineering, Nanjing University, 163 Xianlin Road, Nanjing, 210023, China; Frontiers Science Center for Critical Earth Material Cycling (FSC-CEMaC), Nanjing University, Nanjing, 210023, China.
| | - Junfeng Ji
- Key Laboratory of Surficial Geochemistry, Ministry of Education, School of Earth Sciences and Engineering, Nanjing University, 163 Xianlin Road, Nanjing, 210023, China; Frontiers Science Center for Critical Earth Material Cycling (FSC-CEMaC), Nanjing University, Nanjing, 210023, China
| | - Wei Li
- Key Laboratory of Surficial Geochemistry, Ministry of Education, School of Earth Sciences and Engineering, Nanjing University, 163 Xianlin Road, Nanjing, 210023, China; Research Center for Environmental Nanotechnology (ReCENT), Nanjing University, 163 Xianlin Road, Nanjing, 210023, China; Frontiers Science Center for Critical Earth Material Cycling (FSC-CEMaC), Nanjing University, Nanjing, 210023, China.
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Ahmad T, Danish M. A review of avocado waste-derived adsorbents: Characterizations, adsorption characteristics, and surface mechanism. CHEMOSPHERE 2022; 296:134036. [PMID: 35202667 DOI: 10.1016/j.chemosphere.2022.134036] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Revised: 02/06/2022] [Accepted: 02/16/2022] [Indexed: 06/14/2023]
Abstract
Avocado is one of the most important fruits with a high nutritional content; this fruit is consumed and cultivated worldwide. It is originally grown in Central America and the West Indies islands. But it is now cultivated in the tropical and subtropical regions of the world. Avocado waste is an abundantly available raw material that can be converted into adsorbents to remove different pollutants from aqueous solutions. This review article explores the utilization of avocado waste as raw material to develop an efficient adsorbent and its use against various toxicants. Many research papers have been published on the use of avocado waste-derived adsorbents in the recent past. The factors that affect the adsorption processes are examined in light of published references. Some critical adsorption parameters, such as equilibrium (isotherms), kinetics, and thermodynamics, have been reported in the published literature; these parameters and their data are critically discussed. The characterization, mechanism, and surface chemistry of avocado waste-derived adsorbents are also discussed. To date, no review article on avocado waste-derived adsorbents is available, where researchers can get an overview of the preparation, characterization, and adsorption attributes of avocado waste adsorbents against various pollutants. Recent literature demonstrates the effective utilization of avocado waste as a cleaner and sustainable raw material for the production of adsorbents.
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Affiliation(s)
- Tanweer Ahmad
- Department of Chemistry, School of Mathematics and Natural Science, The Copperbelt University, Kitwe, Zambia
| | - Mohammed Danish
- Bioresource Technology Division, School of Industrial Technology, Universiti Sains Malaysia, Minden Campus, Penang, 11800, Pulau Pinang, Malaysia.
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Olejarczyk M, Rykowska I, Urbaniak W. Management of Solid Waste Containing Fluoride-A Review. MATERIALS 2022; 15:ma15103461. [PMID: 35629486 PMCID: PMC9147173 DOI: 10.3390/ma15103461] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/18/2022] [Revised: 04/22/2022] [Accepted: 05/09/2022] [Indexed: 02/01/2023]
Abstract
Technological and economic development have influenced the amount of post-production waste. Post-industrial waste, generated in the most considerable amount, includes, among others, waste related to the mining, metallurgical, and energy industries. Various non-hazardous or hazardous wastes can be used to produce new construction materials after the “solidification/stabilization” processes. They can be used as admixtures or raw materials. However, the production of construction materials from various non-hazardous or hazardous waste materials is still very limited. In our opinion, special attention should be paid to waste containing fluoride, and the reuse of solid waste containing fluoride is a high priority today. Fluoride is one of the few trace elements that has received much attention due to its harmful effects on the environment and human and animal health. In addition to natural sources, industry, which discharges wastewater containing F− ions into surface waters, also increases fluoride concentration in waters and pollutes the environment. Therefore, developing effective and robust technologies to remove fluoride excess from the aquatic environment is becoming extremely important. This review aims to cover a wide variety of procedures that have been used to remove fluoride from drinking water and industrial wastewater. In addition, the ability to absorb fluoride, among others, by industrial by-products, agricultural waste, and biomass materials were reviewed.
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Affiliation(s)
- Małgorzata Olejarczyk
- Faculty of Chemistry, Adam Mickiewicz University, ul. Uniwersytetu Poznańskiego 8, 61-614 Poznań, Poland; (M.O.); (I.R.)
- Construction Company “Waciński” Witold Waciński, ul. Długa 15, 83-307 Kiełpino, Poland
| | - Iwona Rykowska
- Faculty of Chemistry, Adam Mickiewicz University, ul. Uniwersytetu Poznańskiego 8, 61-614 Poznań, Poland; (M.O.); (I.R.)
| | - Włodzimierz Urbaniak
- Faculty of Chemistry, Adam Mickiewicz University, ul. Uniwersytetu Poznańskiego 8, 61-614 Poznań, Poland; (M.O.); (I.R.)
- Correspondence:
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Sharma R, Sharma R, Parveen K, Pant D, Malaviya P. Comprehensive and critical appraisal of plant-based defluoridation from environmental matrices. CHEMOSPHERE 2021; 281:130892. [PMID: 34044304 DOI: 10.1016/j.chemosphere.2021.130892] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Revised: 05/03/2021] [Accepted: 05/08/2021] [Indexed: 06/12/2023]
Abstract
Fluoride is recognized as one of the global environmental threats because of its non-biodegradable nature and long-term persistence in the environment. This has created the dire need to explore various defluoridation techniques (membrane process, adsorption, precipitation, reverse osmosis, ion exchange, and electrocoagulation). Owing to their cost ineffectiveness and high operational costs, these technologies failed to find any practical utility in fluoride remediation. Comparatively, defluoridation techniques involving the use of low-cost plant-derived adsorbents and fluoride phytoremediators are considered better alternatives. Through this review, an attempt has been made to critically synthesize information about various plant-based bioadsorbents and hyperaccumulators from existing literature. Moreover, mechanisms underlying the fluoride adsorption and accumulation by plants have been thoroughly discussed that will invigorate the researchers to develop novel ideas about process/product modifications to further enhance the removal potential of the adsorbents and plants. Literature survey unravels that various low-cost plant-derived adsorbents have shown their efficacy in defluoridation, yet there is an urgent need to explore their pragmatic application on a commercial scale.
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Affiliation(s)
- Ritika Sharma
- Department of Botany, Central University of Jammu, Samba, Jammu and Kashmir, India
| | - Rozi Sharma
- Department of Environmental Sciences, University of Jammu, Jammu, Jammu and Kashmir, India
| | - Khalida Parveen
- Department of Environmental Sciences, University of Jammu, Jammu, Jammu and Kashmir, India
| | - Deepak Pant
- Separation & Conversion Technology, Flemish Institute for Technological Research (VITO), Boeretang 200, Mol, 2400, Belgium
| | - Piyush Malaviya
- Department of Environmental Sciences, University of Jammu, Jammu, Jammu and Kashmir, India.
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Sahu S, Mallik L, Pahi S, Barik B, Sahu UK, Sillanpää M, Patel RK. Facile synthesis of poly o-toluidine modified lanthanum phosphate nanocomposite as a superior adsorbent for selective fluoride removal: A mechanistic and kinetic study. CHEMOSPHERE 2020; 252:126551. [PMID: 32217412 DOI: 10.1016/j.chemosphere.2020.126551] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Revised: 03/14/2020] [Accepted: 03/17/2020] [Indexed: 06/10/2023]
Abstract
This work reports the synthesis of a new adsorbent material (LaP-POT), synthesised by sol-gel polymerisation method from lanthanum phosphate (LaP) and poly o-toluidine (POT). The sustainability and selectivity of the material as a potential adsorbent is evaluated for the removal of fluoride from aqueous as well as real water samples using batch experimental techniques. FESEM and TEM images showed the successful incorporation of rod-shaped lanthanum phosphate into the poly o-toluidine polymer matrix. The increased degradation temperature of LaP-POT from TGA curve inferred a definite interaction between two. XPS study revealed the successful binding of fluoride onto LaP-POT. The selectivity of fluoride ion onto LaP-POT material was ascertained by the distribution coefficient value. The co-anions showed little effect on fluoride removal. Kinetic study suggested that intraparticle diffusion is not the only rate controlling step; the external mass transfer or chemical interaction also impacts the fluoride adsorption. The maximum adsorption was observed at room temperature with a maximum Langmuir uptake capacity of 10.94 mg g-1. The reusability of the material is tested up to 5 successive cycles for a workable commercial application purpose. The results showed that LaP-POT provides more active sites, thus making it a promising adsorbent for the removal of fluoride.
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Affiliation(s)
- Sumanta Sahu
- Department of Chemistry, National Institute of Technology, Rourkela, 769008, India
| | - Laxmi Mallik
- Department of Chemistry, National Institute of Technology, Rourkela, 769008, India
| | - Souman Pahi
- Department of Chemistry, National Institute of Technology, Rourkela, 769008, India
| | - Bapun Barik
- Department of Chemistry, National Institute of Technology, Rourkela, 769008, India
| | - Uttam Kumar Sahu
- State Key Laboratory of Geohazard Prevention and Geoenvironment Protection (Chengdu University of Technology), Dongsanlu, Erxianqiao, Chengdu, 610059, Sichuan, PR China
| | - Mika Sillanpää
- Department of Green Chemistry, LUT University, Sammonkatu 12, FI-50130, Mikkeli, Finland
| | - Raj Kishore Patel
- Department of Chemistry, National Institute of Technology, Rourkela, 769008, India.
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13
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Kumari U, Siddiqi H, Bal M, Meikap B. Calcium and zirconium modified acid activated alumina for adsorptive removal of fluoride: Performance evaluation, kinetics, isotherm, characterization and industrial wastewater treatment. ADV POWDER TECHNOL 2020. [DOI: 10.1016/j.apt.2020.02.035] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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14
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Wang H, Yang H, Zhao L. A Facile Synthesis of Core-Shell SiO 2@Cu-LBMS Nano-Microspheres for Drug Sustained Release Systems. MATERIALS 2019; 12:ma12233978. [PMID: 31801258 PMCID: PMC6926544 DOI: 10.3390/ma12233978] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/16/2019] [Revised: 11/26/2019] [Accepted: 11/28/2019] [Indexed: 12/28/2022]
Abstract
A well-dispersed SiO2@Layered hydroxide cupric benzoate (SiO2@Cu-LBMS) with a hierarchical structure have been synthesized by a facile method. The layered hydroxide cupric benzoate with a structure of layered basic metal salt (Cu-LBMS) was directly deposited on the surface of silica spheres without any blinder. The morphology of the SiO2@Cu-LBMS nano-microsphere was observed by SEM, and the reaction conditions was also discussed. In addition, the XRD patterns and FTIR spectra provide consistent evidence to the formation of SiO2@Cu-LBMS nano-microspheres. The release behavior and drug loading capability of SiO2@Cu-LBMS microspheres were also investigated by using ibuprofen, aspirin and salicylic acid as model drugs. The results indicated that the drug loading capability of SiO2@Cu-LBMS nano-microspheres was much larger than layered hydroxide cupric benzoate, and the releasing time was significantly prolonged than layered hydroxide cupric benzoate and their physical mixture.
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Affiliation(s)
- Hui Wang
- College of Chemistry and Chemical Engineering, Shaanxi Key Laboratory of Phytochemistry, Baoji University of Arts and Sciences, Baoji 721013, China; (H.W.); (L.Z.)
| | - Haifeng Yang
- College of Physics and Optoelectronics Technology, Medical Micro-nano Materials Research Center, Baoji University of Arts and Sciences, Baoji 721016, China
- Correspondence:
| | - Lifang Zhao
- College of Chemistry and Chemical Engineering, Shaanxi Key Laboratory of Phytochemistry, Baoji University of Arts and Sciences, Baoji 721013, China; (H.W.); (L.Z.)
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15
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Ma W, Zhang W, Chen Y, Wang Y, Yu F, Liu C. Enhanced removal of fluoride and arsenate ions from aqueous solution by magnetic Mg–Al composite oxides (Fe3O4@Mg–Al–O). INORG NANO-MET CHEM 2019. [DOI: 10.1080/24701556.2019.1661461] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Wenqing Ma
- School of Chemistry and Chemical Engineering, Qinghai Normal University, Xining, Qinghai, PR China
| | - Wei Zhang
- School of Chemistry and Chemical Engineering, Qinghai Normal University, Xining, Qinghai, PR China
| | - Yuantao Chen
- School of Chemistry and Chemical Engineering, Qinghai Normal University, Xining, Qinghai, PR China
| | - Yunsheng Wang
- School of Chemistry and Chemical Engineering, Qinghai Normal University, Xining, Qinghai, PR China
| | - Fang Yu
- School of Chemistry and Chemical Engineering, Qinghai Normal University, Xining, Qinghai, PR China
| | - Chen Liu
- School of Chemistry and Chemical Engineering, Qinghai Normal University, Xining, Qinghai, PR China
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16
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Hoxha A, Gillam DG, Bushby AJ, Agha A, Patel MP. Layered Double Hydroxide Fluoride Release in Dental Applications: A Systematic Review. Dent J (Basel) 2019; 7:dj7030087. [PMID: 31480648 PMCID: PMC6784472 DOI: 10.3390/dj7030087] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2019] [Revised: 08/17/2019] [Accepted: 08/20/2019] [Indexed: 11/16/2022] Open
Abstract
This systematic review appraises studies conducted with layered double hydroxides (LDHs) for fluoride release in dentistry. LDH has been used as antacids, water purification in removing excess fluoride in drinking water and drug delivery. It has great potential for controlled fluoride release in dentistry, e.g., varnishes, fissure sealants and muco-adhesive strips, etc. The Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) Statement was followed with two reviewers performing a literature search using four databases: PubMed, Web of Science, Science Direct and Ovid Medline with no date restrictions. Studies including any LDH for ion/drug release in dentistry were included, while assessing the application of LDH and the value of the methodology, e.g., ion release protocol and the LDH production process. Results: A total of 258 articles were identified and four met the inclusion criteria. Based on two in vitro studies and one clinical study, LDH was previously studied in dental materials, such as dental composites and buccal muco-adhesive strips for fluoride release, with the latter studied in a clinical environment. The fourth study analysed LDH powder alone (without being incorporated into dental materials). It demonstrated fluoride release and the uptake of volatile sulphur compounds (VSC), which may reduce halitosis (malodour). Conclusion: LDHs incorporated in dental materials have been previously evaluated for fluoride release and proven to be clinically safe. LDHs have the potential to sustain a controlled release of fluoride (or other cariostatic ions) in the oral environment to prevent caries. However, further analyses of LDH compositions, and clinical research investigating any other cariostatic effects, are required.
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Affiliation(s)
- Agron Hoxha
- Oral Bioengineering, Barts and the London School of Medicine and Dentistry, Institute of Dentistry, Queen Mary University of London, Mile End Road, London E1 4NS, UK.
| | - David G Gillam
- Centre for Adult Oral Health, Barts and the London School of Medicine and Dentistry, Institute of Dentistry, Queen Mary University, New Road, London E1 2AD, UK
| | - Andy J Bushby
- School of Engineering and Materials Science, Queen Mary University of London, London E1 4NS, UK
| | - Amani Agha
- Oral Bioengineering, Barts and the London School of Medicine and Dentistry, Institute of Dentistry, Queen Mary University of London, Mile End Road, London E1 4NS, UK
| | - Mangala P Patel
- Oral Bioengineering, Barts and the London School of Medicine and Dentistry, Institute of Dentistry, Queen Mary University of London, Mile End Road, London E1 4NS, UK
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17
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Kabir H, Gupta AK, Debnath D. Synthesis, optimization and characterization of mesoporous Mg-Al-Fe tri-metal nanocomposite targeting defluoridation: Synergistic interaction of molar ratio and thermal activation. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.07.073] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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18
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Patra G, Das P, Chakraborty S, Meikap BC. Removal of fluoride from wastewater using HCl-treated activated alumina in a ribbed hydrocyclone separator. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART A, TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING 2018; 53:601-608. [PMID: 29381416 DOI: 10.1080/10934529.2018.1429728] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Excessive fluoride concentration in wastewater is a major health concern worldwide. The main objective of wastewater treatment is to allow industrial effluents to be disposed of without danger to the human health and the natural environment. In this current study, experiments have been conducted to remove fluoride from aqueous solution using alumina and HCl (Hydrochloric acid) treated activated alumina in a continuous mode. A spiral rib was introduced in the cylindrical part of the conventional hydrocyclone to increase the performance, and the new hydrocyclone is dubbed as ribbed hydrocyclone. Experiments were carried out to analyze the performance of the ribbed hydrocyclone and compared the results with the conventional hydrocyclone of the same dimension. The efficiency of conventional and ribbed hydrocyclone at a slurry flow rate of 50 LPM (liter per minute) for the solid concentration of 1.4 wt% were 80% and 93.5% respectively. The cut size d50 of the conventional and ribbed hydrocyclone was 18 µm and 13 µm respectively at a slurry velocity of 50 LPM. Fluoride removal efficiency using alumina and HCl-treated alumina was also investigated in a continuous mode by the ribbed hydrocyclone. Maximum fluoride removal efficiency was 49.5%, and 80% for alumina and HCl-treated alumina for the initial concentration of 10 mg/L at a slurry flow rate of 50 LPM.
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Affiliation(s)
- Gayatree Patra
- a Department of Chemical Engineering , Indian Institute of Technology (IIT) , Kharagpur , West Bengal , India
| | - Priyam Das
- a Department of Chemical Engineering , Indian Institute of Technology (IIT) , Kharagpur , West Bengal , India
| | - S Chakraborty
- a Department of Chemical Engineering , Indian Institute of Technology (IIT) , Kharagpur , West Bengal , India
| | - B C Meikap
- a Department of Chemical Engineering , Indian Institute of Technology (IIT) , Kharagpur , West Bengal , India
- b Department of Chemical Engineering, School of Engineering, Howard College , University of Kwazulu-Natal (UKZN) , Durban , Kwazulu-Natal , South Africa
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19
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Yadav KK, Gupta N, Kumar V, Khan SA, Kumar A. A review of emerging adsorbents and current demand for defluoridation of water: Bright future in water sustainability. ENVIRONMENT INTERNATIONAL 2018; 111:80-108. [PMID: 29190529 DOI: 10.1016/j.envint.2017.11.014] [Citation(s) in RCA: 86] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2017] [Revised: 11/17/2017] [Accepted: 11/18/2017] [Indexed: 06/07/2023]
Abstract
Fluoride contamination of groundwater is a serious problem in several countries of the world because of the intake of excessive fluoride caused by the drinking of the contaminated groundwater. Geological and anthropogenic factors are responsible for the contamination of groundwater with fluoride. Excess amounts of fluoride in potable water may cause irreversible demineralisation of bone and tooth tissues, a condition called fluorosis, and long-term damage to the brain, liver, thyroid, and kidney. There has long been a need for fluoride removal from potable water to make it safe for human use. From among several defluoridation technologies, adsorption is the technology most commonly used due to its cost-effectiveness, ease of operation, and simple physical process. In this paper, the adsorption capacities and fluoride removal efficiencies of different types of adsorbents are compiled from relevant published data available in the literature and represented graphically. The most promising adsorbents tested so far from each category of adsorbents are also highlighted. There is still a need to discover the actual feasibility of usage of adsorbents in the field on a commercial scale and to define the reusability of adsorbents to reduce cost and the waste produced from the adsorption process. The present paper reviews the currently available methods and emerging approaches for defluoridation of water.
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Affiliation(s)
- Krishna Kumar Yadav
- Institute of Environment and Development Studies, Bundelkhand University, Jhansi 284128, India.
| | - Neha Gupta
- Institute of Environment and Development Studies, Bundelkhand University, Jhansi 284128, India.
| | - Vinit Kumar
- Institute of Environment and Development Studies, Bundelkhand University, Jhansi 284128, India
| | - Shakeel Ahmad Khan
- Centre for Environment Science and Climate Resilient Agriculture, Indian Agricultural Research Institute, New Delhi 110012, India
| | - Amit Kumar
- Centre for Environment Science and Climate Resilient Agriculture, Indian Agricultural Research Institute, New Delhi 110012, India
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20
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Clark I, Dunne PW, Gomes RL, Lester E. Continuous hydrothermal synthesis of Ca2Al-NO3 layered double hydroxides: The impact of reactor temperature, pressure and NaOH concentration on crystal characteristics. J Colloid Interface Sci 2017; 504:492-499. [DOI: 10.1016/j.jcis.2017.05.105] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2017] [Revised: 05/09/2017] [Accepted: 05/25/2017] [Indexed: 10/19/2022]
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21
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Synthesis and environmental application of zirconium–chitosan/graphene oxide membrane. J Taiwan Inst Chem Eng 2017. [DOI: 10.1016/j.jtice.2017.04.029] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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22
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Ji H, Wu W, Li F, Yu X, Fu J, Jia L. Enhanced adsorption of bromate from aqueous solutions on ordered mesoporous Mg-Al layered double hydroxides (LDHs). JOURNAL OF HAZARDOUS MATERIALS 2017; 334:212-222. [PMID: 28414999 DOI: 10.1016/j.jhazmat.2017.04.014] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2016] [Revised: 04/03/2017] [Accepted: 04/05/2017] [Indexed: 05/05/2023]
Abstract
An ordered mesoporous Mg-Al layered double hydroxide (meso-LDH350) with a fairly high Brunauer-Emmett-Teller (BET) surface area (126m2g-1) has been facilely synthesized and then evaluated for the adsorptive removal of bromate from aqueous solutions. Adsorbents were characterized by a variety of techniques (e.g., XRD, FTIR, SEM, TG-DSC, N2 physisorption, XPS, etc.). The adsorption studies indicated that the presence of background electrolytes and competitive anions can obviously repress the uptake of bromate on LDHs. The adsorption isotherms agree well with the Langmuir model, giving a maximum adsorption capacity of 59.34mgg-1 (pH 7.5, 10°C) for meso-LDH350, which is much higher than other LDH-type adsorbents reported in literature. The adsorption kinetic data can be well fitted with the pseudo-second-order rate model. Based on the macroscopic and microscopic studies, bromate adsorption on meso-LDH350 was associated with two mechanisms: the reconstruction of the layered structures of meso-LDH350 and the anion-exchange between bromate and the intercalated anions.
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Affiliation(s)
- Huashun Ji
- CICAEET Center, AEMPC Lab, School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, 219 Ningliu Road, Nanjing 210044, China
| | - Wenhao Wu
- CICAEET Center, AEMPC Lab, School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, 219 Ningliu Road, Nanjing 210044, China
| | - Feihu Li
- CICAEET Center, AEMPC Lab, School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, 219 Ningliu Road, Nanjing 210044, China.
| | - Xiaoxue Yu
- CICAEET Center, AEMPC Lab, School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, 219 Ningliu Road, Nanjing 210044, China
| | - Jingjing Fu
- CICAEET Center, AEMPC Lab, School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, 219 Ningliu Road, Nanjing 210044, China
| | - Luyao Jia
- CICAEET Center, AEMPC Lab, School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, 219 Ningliu Road, Nanjing 210044, China
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24
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Ghosal PS, Gupta AK. Determination of thermodynamic parameters from Langmuir isotherm constant-revisited. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2016.11.058] [Citation(s) in RCA: 158] [Impact Index Per Article: 22.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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25
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Zhang J, Chen N, Tang Z, Yu Y, Hu Q, Feng C. A study of the mechanism of fluoride adsorption from aqueous solutions onto Fe-impregnated chitosan. Phys Chem Chem Phys 2016; 17:12041-50. [PMID: 25872764 DOI: 10.1039/c5cp00817d] [Citation(s) in RCA: 64] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
UNLABELLED The adsorption of fluoride from aqueous solutions onto an Fe-impregnated chitosan (Fe-CTS) granular adsorbent was studied, and the adsorption capacity was determined to be 1.9736 mg g(-1) at an initial fluoride concentration of 10 mg L(-1). The effects of the initial fluoride concentration, dosage, and temperature were investigated using factorial design and analysis. The results indicated that high initial fluoride concentrations, low dosages, and low temperatures could enhance the fluoride adsorption capacity. In addition, Fe-CTS exhibited high selectivity for fluoride removal in the presence of high levels of several coexisting anions (nitrate, chloride, bicarbonate, and phosphate), except carbonate and sulfate. The adsorption process followed the Langmuir model at low fluoride concentrations and the Freundlich model at high initial fluoride concentrations. The data also fit the pseudo-second-order model. Scanning electron microscopy (SEM), Fourier-transform infrared (FTIR) spectroscopy, and extended X-ray absorption fine-structure (EXAFS) spectroscopy were used to elucidate the adsorption mechanism. The FTIR and EXAFS analyses revealed that Fe was chelated with -NH2 and -OH groups on the CTS, and fluoride adsorption on the Fe-CTS occurred due to ion exchange between chloride and fluoride. HIGHLIGHTS a granular Fe-impregnated chitosan (Fe-CTS) adsorbent was synthesized via chelation of Fe ions to -OH and -NH2 groups of CTS. The Fe-CTS granular adsorbent exhibited high performance for the adsorption of fluoride. The mechanism of fluoride adsorption on Fe-CTS was elucidated using EXAFS and FTIR analyses. Fluoride adsorption on Fe-CTS occurred via ion exchange between chloride and fluoride.
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Affiliation(s)
- Jing Zhang
- School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, China.
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26
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Ghosal PS, Gupta AK. An insight into thermodynamics of adsorptive removal of fluoride by calcined Ca–Al–(NO3) layered double hydroxide. RSC Adv 2015. [DOI: 10.1039/c5ra20538g] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A framework for determination of thermodynamic equilibrium constant and Gibbs free surface energy change was presented. The interactive effect of temperature on adsorption process was addressed by RSM. Endothermic, spontaneous reaction was observed.
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Affiliation(s)
- Partha S. Ghosal
- Environmental Engineering Division
- Department of Civil Engineering
- Indian Institute of Technology
- Kharagpur
- India
| | - Ashok K. Gupta
- Environmental Engineering Division
- Department of Civil Engineering
- Indian Institute of Technology
- Kharagpur
- India
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27
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Habuda-Stanić M, Ravančić ME, Flanagan A. A Review on Adsorption of Fluoride from Aqueous Solution. MATERIALS (BASEL, SWITZERLAND) 2014; 7:6317-6366. [PMID: 28788194 PMCID: PMC5456123 DOI: 10.3390/ma7096317] [Citation(s) in RCA: 106] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 07/08/2014] [Revised: 08/19/2014] [Accepted: 08/22/2014] [Indexed: 11/17/2022]
Abstract
Fluoride is one of the anionic contaminants which is found in excess in surface or groundwater because of geochemical reactions or anthropogenic activities such as the disposal of industrial wastewaters. Among various methods used for defluoridation of water such as coagulation, precipitation, membrane processes, electrolytic treatment, ion-exchange, the adsorption process is widely used. It offers satisfactory results and seems to be a more attractive method for the removal of fluoride in terms of cost, simplicity of design and operation. Various conventional and non-conventional adsorbents have been assessed for the removal of fluoride from water. In this review, a list of various adsorbents (oxides and hydroxides, biosorbents, geomaterials, carbonaceous materials and industrial products and by-products) and its modifications from literature are surveyed and their adsorption capacities under various conditions are compared. The effect of other impurities on fluoride removal has also been discussed. This survey showed that various adsorbents, especially binary and trimetal oxides and hydroxides, have good potential for the fluoride removal from aquatic environments.
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Affiliation(s)
- Mirna Habuda-Stanić
- Department of Chemistry and Ecology, Faculty of Food Technology, Josip Juraj Strossmayer University of Osijek, Franje Kuhača 20, HR-31000 Osijek, Croatia.
| | - Maja Ergović Ravančić
- Department of Food Technology, University of Applied Sciences in Požega, Vukovarska 17, HR-34000 Požega, Croatia.
| | - Andrew Flanagan
- HSE Public Analyst's Laboratory Galway, University College Hospital, Seamus Quirke Road, Galway, Ireland.
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28
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Mandal S, Sahu MK, Giri AK, Patel RK. Adsorption studies of chromium (VI) removal from water by lanthanum diethanolamine hybrid material. ENVIRONMENTAL TECHNOLOGY 2014; 35:817-832. [PMID: 24645464 DOI: 10.1080/09593330.2013.852627] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
In the present research work, lanthanum diethanolamine hybrid material is synthesized by co-precipitation method and used for the removal of Cr(VI) from synthetic dichromate solution and hand pump water sample. The sorption experiments were carried out in batch mode to optimize various influencing parameters such as adsorbent dose, contact time, pH, competitive anions and temperature. The characterization of the material and mechanism of Cr(VI) adsorption on the material was studied by using scanning electron microscope, Fourier transform infrared, X-ray diffraction, Brunauer-Emmett-Teller and thermogravimetric analysis-differential thermal analysis. Adsorption kinetics studies reveal that the adsorption process followed first-order kinetics and intraparticle diffusion model with correlation coefficients (R2) of 0.96 and 0.97, respectively. The adsorption data were best fitted to linearly transformed Langmuir isotherm with correlation coefficient (R2) of 0.997. The maximum removal of Cr(VI) is found to be 99.31% at optimal condition: pH = 5.6 of the solution, adsorbent dose of 8 g L(-1) with initial concentration of 10mgL(-1) of Cr(VI) solution and an equilibrium time of 50 min. The maximum adsorption capacity of the material is 357.1 mg g(-1). Thermodynamic parameters were evaluated to study the effect of temperature on the removal process. The study shows that the adsorption process is feasible and endothermic in nature. The value of E (260.6 kJ mol(-1)) indicates the chemisorption nature of the adsorption process. The material is difficult to be regenerated. The above studies indicate that the hybrid material is capable of removing Cr(VI) from water.
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29
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Lin Y, Fang Q, Chen B. Metal composition of layered double hydroxides (LDHs) regulating ClO(-)4 adsorption to calcined LDHs via the memory effect and hydrogen bonding. J Environ Sci (China) 2014; 26:493-501. [PMID: 25079260 DOI: 10.1016/s1001-0742(13)60462-3] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2013] [Revised: 11/25/2013] [Accepted: 12/18/2013] [Indexed: 05/17/2023]
Abstract
A series of calcined carbonate layered double hydroxides (CLDHs) with various metal compositions and different M(2+)/M(3+) ratios were prepared as adsorbents for perchlorate. Adsorption isotherms fit Langmuir model well, and the adsorption amount followed the order of MgAl-CLDHs ≥ MgFe-CLDHs >> ZnAl-CLDHs. The isotherms of MgAl-CLDHs and MgFe-CLDHs displayed a two-step shape at low and high concentration ranges and increased with an increase in the M(2+)/M(3+) ratio from 2 to 4. The two-step isotherm was not observed for ZnAl-CLDHs, and the adsorption was minimally affected by the M(2+)/M(3+) ratio. The LDHs, CLDHs and the reconstructed samples were characterized by X-ray diffraction, SEM, FT-IR and Raman spectra to delineate the analysis of perchlorate adsorption mechanisms. The perchlorate adsorption of MgAl-CLDHs and MgFe-CLDHs was dominated by the structural memory effect and the hydrogen bonds between the free hydroxyl groups on the reconstructed-LDHs and the oxygen atoms of the perchlorates. For ZnAl-CLDHs, the perchlorate adsorption was controlled by the structural memory effect only, as the hydroxyl groups on the hydroxide layers preferred to form strong hydrogen bonds with carbonate over perchlorate, which locked the intercalated perchlorate into a more confined nano-interlayer. Several distinct binding mechanisms of perchlorate by CLDHs with unique M(2+) ions were proposed.
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Affiliation(s)
- Yajie Lin
- Department of Environmental Science, Zhejiang University, Hangzhou 310058, China; Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou 310058, China.
| | - Qile Fang
- Department of Environmental Science, Zhejiang University, Hangzhou 310058, China; Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou 310058, China
| | - Baoliang Chen
- Department of Environmental Science, Zhejiang University, Hangzhou 310058, China; Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou 310058, China.
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