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Shao Y, Wang P, Zheng R, Zhao Z, An J, Hao C, Kang M. Preparation of molecularly imprinted ratiometric fluorescence sensor for visual detection of tetrabromobisphenol A in water samples. Mikrochim Acta 2023; 190:161. [PMID: 36976361 DOI: 10.1007/s00604-023-05745-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Accepted: 03/10/2023] [Indexed: 03/29/2023]
Abstract
A sensitive molecularly imprinted ratiometric fluorescence sensor was constructed for the first time to visually detect tetrabromobisphenol A (TBBPA). The blue fluorescent carbon quantum dots (CQDs) were coated with SiO2 through the reverse microemulsion method to obtain a stable internal reference signal CQDs@SiO2. The ratiometric fluorescence sensor was finally prepared using red fluorescent CdTe QDs as the response signal in the presence of CQDs@SiO2. When the molecularly imprinted polymers were combined with TBBPA, the fluorescence of CdTe QDs (Ex = 365 nm, Em = 665 nm) was rapidly quenched, while that of CQDs (Ex = 365 nm, Em = 441 nm) remained stable, resulting in a noticeable fluorescence color change. Moreover, the fluorescence intensity ratio (I665/I441)0/(I665/I441) of the sensor showed a linear response to TBBPA in the concentration range 0.1 to 10 μM with a low detection limit of 3.8 nM. The prepared sensor was successfully applied to detect TBBPA in water samples. The recoveries were in the range 98.2-103%, with relative standard deviations lower than 2.5%. Furthermore, a fluorescent test strip for visual monitoring of TBBPA was constructed to streamline the procedure. The excellent results demonstrate that the prepared test strip has a broad prospect for the offline detection of pollutants.
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Affiliation(s)
- Yanming Shao
- College of Chemistry and Chemical Engineering, Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry, Ministry of Education, Shaanxi Key Laboratory of Chemical Additives for Industry, Shaanxi University of Science and Technology, Xi'an, Shaanxi, 710021, People's Republic of China.
| | - Peng Wang
- College of Chemistry and Chemical Engineering, Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry, Ministry of Education, Shaanxi Key Laboratory of Chemical Additives for Industry, Shaanxi University of Science and Technology, Xi'an, Shaanxi, 710021, People's Republic of China
| | - Rui Zheng
- College of Chemistry and Chemical Engineering, Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry, Ministry of Education, Shaanxi Key Laboratory of Chemical Additives for Industry, Shaanxi University of Science and Technology, Xi'an, Shaanxi, 710021, People's Republic of China
| | - Zhizhen Zhao
- College of Chemistry and Chemical Engineering, Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry, Ministry of Education, Shaanxi Key Laboratory of Chemical Additives for Industry, Shaanxi University of Science and Technology, Xi'an, Shaanxi, 710021, People's Republic of China
| | - Jun An
- College of Chemistry and Chemical Engineering, Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry, Ministry of Education, Shaanxi Key Laboratory of Chemical Additives for Industry, Shaanxi University of Science and Technology, Xi'an, Shaanxi, 710021, People's Republic of China
| | - Caifeng Hao
- College of Chemistry and Chemical Engineering, Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry, Ministry of Education, Shaanxi Key Laboratory of Chemical Additives for Industry, Shaanxi University of Science and Technology, Xi'an, Shaanxi, 710021, People's Republic of China
| | - Mengyi Kang
- College of Chemistry and Chemical Engineering, Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry, Ministry of Education, Shaanxi Key Laboratory of Chemical Additives for Industry, Shaanxi University of Science and Technology, Xi'an, Shaanxi, 710021, People's Republic of China
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Khanam J, Hasan MR, Biswas B, Jahan SA, Sharmin N, Ahmed S, Al-Reza SM. Development of ceramic grade red iron oxide pigment from waste iron source. Heliyon 2023; 9:e12854. [PMID: 36685414 PMCID: PMC9853363 DOI: 10.1016/j.heliyon.2023.e12854] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Revised: 12/25/2022] [Accepted: 01/04/2023] [Indexed: 01/10/2023] Open
Abstract
Ceramic grade red iron oxide (α-Fe2O3) nanoparticles pigments have been synthesized from waste condensed milk containers which contain a prominent amount of iron (93.2%). The synthesis method comprised of two steps: in the first step ferrous sulfate was prepared following an acid leaching method; while the second step was oxidation and calcination of ferrous sulfate to produce desired α-Fe2O3 in nano form. The structure, functional groups, chemical state, morphology, particle size, surface area, elemental, thermal analysis and magnetic properties of the samples were investigated using XRD, FTIR, XPS, SEM, BET, EDS, TG-DT and VSM respectively. Pure hematite (α-Fe2O3) phase was confirmed by XRD and the average crystal sizes were in the range 34-126 nm have been performed by Debye-Scherer's formula, which are consistent with the results as achieved from SEM images. Agglomerated irregular spherical nanoparticles (45-149 nm) were found in SEM image. The surface chemistry and the chemical state (Fe3+) of the hematite nanoparticles was also confirmed by XPS. The mesoporous nature of the nanoparticles with high surface area were measured by BET and it has been revealed that the BET specific surface area (33.55 m2/g) was marginally higher than the commercial one. The magnetic nature of the nanoparticles was portrayed by VSM and the nanoparticles showed the ferromagnetic behavior. Moreover, particle size distributions and zeta potential values have been also measured by DLS.
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Affiliation(s)
- Juliya Khanam
- Institute of Glass and Ceramic Research and Testing (IGCRT), Bangladesh Council of Scientific and Industrial Research (BCSIR), Dhaka, 1205, Bangladesh,Corresponding author. ;
| | - Md. Rashib Hasan
- Department of Applied Chemistry and Chemical Engineering, Islamic University, Kushtia, Bangladesh
| | - Bristy Biswas
- Institute of Glass and Ceramic Research and Testing (IGCRT), Bangladesh Council of Scientific and Industrial Research (BCSIR), Dhaka, 1205, Bangladesh
| | - Shirin Akter Jahan
- Institute of Glass and Ceramic Research and Testing (IGCRT), Bangladesh Council of Scientific and Industrial Research (BCSIR), Dhaka, 1205, Bangladesh
| | - Nahid Sharmin
- Institute of Glass and Ceramic Research and Testing (IGCRT), Bangladesh Council of Scientific and Industrial Research (BCSIR), Dhaka, 1205, Bangladesh
| | - Samina Ahmed
- Institute of Glass and Ceramic Research and Testing (IGCRT), Bangladesh Council of Scientific and Industrial Research (BCSIR), Dhaka, 1205, Bangladesh
| | - Sharif Md. Al-Reza
- Department of Applied Chemistry and Chemical Engineering, Islamic University, Kushtia, Bangladesh
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Xiao Y, Helal AS, Mazario E, Mayoral A, Chevillot-Biraud A, Decorse P, Losno R, Maurel F, Ammar S, Lomas JS, Hémadi M. Functionalized maghemite nanoparticles for enhanced adsorption of uranium from simulated wastewater and magnetic harvesting. ENVIRONMENTAL RESEARCH 2023; 216:114569. [PMID: 36244439 DOI: 10.1016/j.envres.2022.114569] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Revised: 10/05/2022] [Accepted: 10/07/2022] [Indexed: 06/16/2023]
Abstract
Maghemite (γ-Fe2O3) nanoparticles (MNPs) were functionalized with 3-aminopropyltriethoxysilane (APTES) to give APTES@Fe2O3 (AMNP) which was then reacted with diethylenetriamine-pentaacetic acid (DTPA) to give a nanohybrid DTPA-APTES@Fe2O3 (DAMNP). Nano-isothermal titration calorimetry shows that DTPA complexation with uranyl ions in water is exothermic and has a stoichiometry of two DTPA to three uranyl ions. Density functional theory calculations indicate the possibility of several complexes between DTPA and UO22+ with different stoichiometries. Interactions between uranyl ions and DAMNP functional groups are revealed by X-photoelectron and Fourier transform infrared spectroscopies. Spherical aberration-corrected Scanning Transmission Electron Microscopy visualizes uranium on the particle surface. Adsorbent performance metrics were evaluated by batch adsorption studies under different conditions of pH, initial uranium concentration and contact time, and the results expressed in terms of equilibrium adsorption capacities (qe) and partition coefficients (PC). By either criterion, performance increases from MNP to AMNP to DAMNP, with the maximum uptake at pH 5.5 in all cases: MNP, qe = 63 mg g-1, PC = 127 mg g-1 mM-1; AMNP, qe = 165 mg g-1, PC = 584 mg g-1 mM-1; DAMNP, qe = 249 mg g-1, PC = 2318 mg g-1 mM-1 (at 25 °C; initial U concentration 0.63 mM; 5 mg adsorbent in 10 mL of solution; contact time, 3 h). The pH maximum is related to the predominance of mono- and di-cationic uranium species. Uptake by DAMNPs follows a pseudo-first-order or pseudo-second-order kinetic model and fits a variety of adsorption models. The maximum adsorption capacity for DAMNPs is higher than for other functionalized magnetic nanohybrids. This adsorbent can be regenerated and recycled for at least 10 cycles with less than 10% loss in activity, and shows high selectivity. These findings suggest that DAMNP could be a promising adsorbent for the recovery of uranium from nuclear wastewaters.
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Affiliation(s)
- Yawen Xiao
- Université Paris Cité, CNRS, ITODYS, F-75013, Paris, France
| | - Ahmed S Helal
- Université Paris Cité, CNRS, ITODYS, F-75013, Paris, France; Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, USA; Nuclear Materials Authority, P.O. Box 540, El Maadi, Cairo, Egypt
| | - Eva Mazario
- Université Paris Cité, CNRS, ITODYS, F-75013, Paris, France
| | - Alvaro Mayoral
- Universidad de Zaragoza Instituto de Nanociencia de Aragón Zaragoza, Aragon, Spain
| | | | | | - Rémi Losno
- Université Paris Cité, Institut de Physique du Globe de Paris, CNRS, F-75005, Paris, France
| | | | - Souad Ammar
- Université Paris Cité, CNRS, ITODYS, F-75013, Paris, France
| | - John S Lomas
- Université Paris Cité, CNRS, ITODYS, F-75013, Paris, France
| | - Miryana Hémadi
- Université Paris Cité, CNRS, ITODYS, F-75013, Paris, France.
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Shan X, Zhang L, Ye H, Shao J, Shi Y, Tan S, Su K, Zhang L, Cao C. Magnetic solid phase extraction of lead ion from water samples with humic acid modified magnetic nanoparticles prior to its fame atomic absorption spectrometric detection. Microchem J 2022. [DOI: 10.1016/j.microc.2022.107417] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Ji J, Xu S, Ma Z, Mou Y. Trivalent antimony removal using carbonaceous nanomaterial loaded with zero-valent bimetal (iron/copper) and their effect on seed growth. CHEMOSPHERE 2022; 296:134047. [PMID: 35183581 DOI: 10.1016/j.chemosphere.2022.134047] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Revised: 01/29/2022] [Accepted: 02/16/2022] [Indexed: 06/14/2023]
Abstract
As rapid industrial and social growth, antimony mines are the overexploited, leading to the accumulation of trivalent antimony in the aquatic environment near smelters, which harm human health. To eradicate trivalent antimony from water, an innovative nanomaterial in the form of sludge biochar loaded with zero-valent bimetal was synthesized using a liquid-phase reduction method. The adsorption performance of the nanomaterial for trivalent antimony was investigated based on a series of adsorption experiments using sludge biochar, nano zero-valent iron biochar, and nano zero-valent bimetal biochar. The results showed that the optimal adsorption performance of the three nanomaterials for trivalent antimony, considering the economic practicability, was highlighted at solution pH of 3 and 0.05 g of nanomaterial. Additionally, the maximum adsorption capacity of sludge biochar, nano zero-valent iron biochar, and nano zero-valent bimetal biochar is 3.89 mg g-1 at 35 °C, 32.01 mg g-1 at 25 °C, 50.96 mg g-1 at 25 °C, respectively. The adsorption process of sludge biochar is endothermic, resulting in an increase in the adsorption capacity with increasing temperature, whereas the exothermic reaction contributes to decrease in the adsorption capacity at increasing temperature for the other two carbon nanomaterials. The inhibitory effect of coexisting ions was in the order: Al3+ > NH4+ > Na+ > K+; CO32- > CH3COO- > H2PO4- > S2-. Additionally, nanomaterials promoted seed germination and growth. Investigation of the adsorption mechanism using X-ray photoelectron spectroscopy showed that trivalent antimony was oxidised to pentavalent antimony, and Fe(III) was reduced to Fe(II). The formed primary battery formed by copper ions and iron acclerated electron transfer and improved the adsorption rate. This implied that trivalent antimony could be removed through the synergistic action of the adsorption behaviour and redox reaction. Therefore, the biochar loaded with the zero-valent bimetal serves as a pathway for eradicating trivalent antimony.
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Affiliation(s)
- Jianghao Ji
- Key Laboratory of Karst Georesources and Environment, Ministry of Education, Guizhou University, Guiyang, 550025, China; College of Resources and Environmental Engineering, Guizhou University, Guizhou, 550025, Guiyang, China
| | - Siqin Xu
- Key Laboratory of Karst Georesources and Environment, Ministry of Education, Guizhou University, Guiyang, 550025, China; College of Resources and Environmental Engineering, Guizhou University, Guizhou, 550025, Guiyang, China; Guizhou Karst Environmental Ecosystems Observation and Research Station, Ministry of Education, Guiyang, 550025, China.
| | - Zhiqiang Ma
- Key Laboratory of Karst Georesources and Environment, Ministry of Education, Guizhou University, Guiyang, 550025, China; College of Resources and Environmental Engineering, Guizhou University, Guizhou, 550025, Guiyang, China
| | - Yizhen Mou
- Key Laboratory of Karst Georesources and Environment, Ministry of Education, Guizhou University, Guiyang, 550025, China; College of Resources and Environmental Engineering, Guizhou University, Guizhou, 550025, Guiyang, China
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Zhang X, Guo Y, Li W, Zhang J, Wu H, Mao N, Zhang H. Magnetically Recyclable Wool Keratin Modified Magnetite Powders for Efficient Removal of Cu 2+ Ions from Aqueous Solutions. NANOMATERIALS (BASEL, SWITZERLAND) 2021; 11:1068. [PMID: 33919408 PMCID: PMC8143369 DOI: 10.3390/nano11051068] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Revised: 04/15/2021] [Accepted: 04/16/2021] [Indexed: 11/16/2022]
Abstract
The treatment of wastewater containing heavy metals and the utilization of wool waste are very important for the sustainable development of textile mills. In this study, the wool keratin modified magnetite (Fe3O4) powders were fabricated by using wool waste via a co-precipitation technique for removal of Cu2+ ions from aqueous solutions. The morphology, chemical compositions, crystal structure, microstructure, magnetism properties, organic content, and specific surface area of as-fabricated powders were systematically characterized by various techniques including field emission scanning electron microscopy (FESEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), vibrating sample magnetometer (VSM), thermogravimetric (TG) analysis, and Brunauer-Emmett-Teller (BET) surface area analyzer. The effects of experimental parameters such as the volume of wool keratin hydrolysate, the dosage of powder, the initial Cu2+ ion concentration, and the pH value of solution on the adsorption capacity of Cu2+ ions by the powders were examined. The experimental results indicated that the Cu2+ ion adsorption performance of the wool keratin modified Fe3O4 powders exhibited much better than that of the chitosan modified ones with a maximum Cu2+ adsorption capacity of 27.4 mg/g under favorable conditions (0.05 g powders; 50 mL of 40 mg/L CuSO4; pH 5; temperature 293 K). The high adsorption capacity towards Cu2+ ions on the wool keratin modified Fe3O4 powders was primarily because of the strong surface complexation of -COOH and -NH2 functional groups of wool keratins with Cu2+ ions. The Cu2+ ion adsorption process on the wool keratin modified Fe3O4 powders followed the Temkin adsorption isotherm model and the intraparticle diffusion and pseudo-second-order adsorption kinetic models. After Cu2+ ion removal, the wool keratin modified Fe3O4 powders were easily separated using a magnet from aqueous solution and efficiently regenerated using 0.5 M ethylene diamine tetraacetic acid (EDTA)-H2SO4 eluting. The wool keratin modified Fe3O4 powders possessed good regenerative performance after five cycles. This study provided a feasible way to utilize waste wool textiles for preparing magnetic biomass-based adsorbents for the removal of heavy metal ions from aqueous solutions.
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Affiliation(s)
- Xinyue Zhang
- School of Environmental and Chemical Engineering, Xi′an Polytechnic University, Xi′an, Shaanxi 710048, China; (X.Z.); (Y.G.)
- Research Centre for Functional Textile Materials, School of Textile Science and Engineering, Xi’an Polytechnic University, Xi’an, Shaanxi 710048, China; (W.L.); (J.Z.)
| | - Yani Guo
- School of Environmental and Chemical Engineering, Xi′an Polytechnic University, Xi′an, Shaanxi 710048, China; (X.Z.); (Y.G.)
| | - Wenjun Li
- Research Centre for Functional Textile Materials, School of Textile Science and Engineering, Xi’an Polytechnic University, Xi’an, Shaanxi 710048, China; (W.L.); (J.Z.)
- Key Laboratory of Functional Textile Material and Product, Xi’an Polytechnic University, Ministry of Education, Xi’an, Shaanxi 710048, China;
| | - Jinyuan Zhang
- Research Centre for Functional Textile Materials, School of Textile Science and Engineering, Xi’an Polytechnic University, Xi’an, Shaanxi 710048, China; (W.L.); (J.Z.)
- Key Laboratory of Functional Textile Material and Product, Xi’an Polytechnic University, Ministry of Education, Xi’an, Shaanxi 710048, China;
| | - Hailiang Wu
- Key Laboratory of Functional Textile Material and Product, Xi’an Polytechnic University, Ministry of Education, Xi’an, Shaanxi 710048, China;
| | - Ningtao Mao
- Performance Textiles and Clothing Research Group, School of Design, University of Leeds, Leeds LS2 9JT, UK;
| | - Hui Zhang
- Research Centre for Functional Textile Materials, School of Textile Science and Engineering, Xi’an Polytechnic University, Xi’an, Shaanxi 710048, China; (W.L.); (J.Z.)
- Key Laboratory of Functional Textile Material and Product, Xi’an Polytechnic University, Ministry of Education, Xi’an, Shaanxi 710048, China;
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Goncalves MB, Schmidt DVC, Dos Santos FS, Cipriano DF, Gonçalves GR, Freitas JCC, de Pietre MK. Nanostructured faujasite zeolite as metal ion adsorbent: kinetics, equilibrium adsorption and metal recovery studies. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2021; 83:358-371. [PMID: 33504700 DOI: 10.2166/wst.2020.580] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The hydrothermal synthesis of nano-faujasite has been successfully performed and the effects of some crystallization parameters were investigated, along with the use of this material as a heavy-metal ion adsorbent. X-ray diffraction patterns have shown that the structure of the nano-faujasite is strongly dependent on both the crystallization time and the alkalinity of the synthesis medium. According to N2 physisorption, X-ray fluorescence, SEM/EDS, and solid state 29Si and 27Al NMR data, the produced nano-faujasite consists of a solid with low molar Si/Al ratio (1.7), with high availability of ion exchange sites and high surface area/small particle size, allowing easy diffusion of metal ions to adsorbent active sites. As a consequence, an excellent performance on removal of Cd2+, Zn2+ and Cu2+ ions was found for this solid. The adsorption capacity followed the order Cd2+ (133 mg·g-1) > Zn2+ (115 mg·g-1) > Cu2+ (99 mg·g-1), which agrees with the order of increasing absolute values of the hydration energy of the metal ions. Kinetic studies and adsorption isotherms showed that the metal ion removal takes place by ion exchange on the monolayer surface of the nano-faujasite. The electrochemical recovery of copper in metallic form exhibited an efficiency of 80.2% after 120 min, which suggests that this process can be adequately implemented for full-scale metal removal.
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Affiliation(s)
- Mariana B Goncalves
- Department of Chemistry -ICEx, Fluminense Federal University, Rua Desembargador Ellis Hermydio Figueira, 783, 27213-145 Volta Redonda, RJ, Brazil E-mail:
| | - Djanyna V C Schmidt
- Department of Chemistry -ICEx, Fluminense Federal University, Rua Desembargador Ellis Hermydio Figueira, 783, 27213-145 Volta Redonda, RJ, Brazil E-mail:
| | - Fabiana S Dos Santos
- Department of Agribusiness Engineering, Fluminense Federal University, Avenida dos Trabalhadores, 420 Volta Redonda, RJ, Brazil
| | - Daniel F Cipriano
- Laboratory of Carbon and Ceramic Materials, Department of Physics, Federal University of Espírito Santo, 29075-910 Vitória, ES, Brazil
| | - Gustavo R Gonçalves
- Laboratory of Carbon and Ceramic Materials, Department of Physics, Federal University of Espírito Santo, 29075-910 Vitória, ES, Brazil
| | - Jair C C Freitas
- Laboratory of Carbon and Ceramic Materials, Department of Physics, Federal University of Espírito Santo, 29075-910 Vitória, ES, Brazil
| | - Mendelssolm K de Pietre
- Department of Chemistry -ICEx, Fluminense Federal University, Rua Desembargador Ellis Hermydio Figueira, 783, 27213-145 Volta Redonda, RJ, Brazil E-mail:
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Malook K, Khan H. Removal of Cd(II) from water using zero valent iron/copper functionalized spent tea. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2020; 82:2552-2561. [PMID: 33339808 DOI: 10.2166/wst.2020.527] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Zero valent Fe/Cu functionalized spent tea adsorbent was prepared for the decontamination of Cd(II) contaminated water. The synthesized material was characterized for structural and morphological characteristics using various analytical techniques. The material was used as adsorbent for the adsorption of Cd(II) from aqueous solutions in batch study experiments. The effect of initial pH, adsorbent dosage, contact time and adsorbate concentration was investigated. The obtained data well followed the Langmuir adsorption isotherm model and pseudo-second order rate model with maximum adsorption capacity of 89.686 mg·g-1. Based on Langmuir separation factor (R), having a value of 0.706-0.194, the adsorption process was confirmed to be favorable. The adsorbent was used in the form of a column for the sorption of Cd(II) from a running solution with satisfactory results. The spent material was regenerated and reutilized with reduction of adsorption capacity by 1.48% only. Overall, the current adsorbent can be efficiently utilized for the removal of aqueous Cd(II).
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Affiliation(s)
- Khan Malook
- Centralized Resource Laboratory, University of Peshawar, Peshawar 25120, Pakistan E-mail:
| | - Hamayun Khan
- Department of Chemistry, Islamia College Peshawar, Peshawar 25120, Pakistan
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