1
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C Dos Santos C, Almeida AA, Pulcinelli SH, Santilli CV. Relevance of Specific Surface of Mixed Oxide Derived from Layered Double Hydroxides on the Rheological Properties and Porosity of Cement Pastes. ACS APPLIED MATERIALS & INTERFACES 2024. [PMID: 38837200 DOI: 10.1021/acsami.4c01949] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2024]
Abstract
Cement-based products are the synthetic materials most used by humans, with consequent environmental impacts. One strategy that can assist in mitigating the adverse environmental effects of these materials involves the incorporation of multifunctional nanostructured additives. The objective of this work was to demonstrate the efficacy of incorporating mixed oxides (MO) derived from layered double hydroxides (LDH) to control the rheology and porosity of cement-based matrices. Thermal aging of LDH enabled the preparation of MO with different specific surface areas (SSA) for incorporation in different amounts in Portland cement. A low proportion of MO and low SSA increased workability by 22%. In contrast, a high proportion of MO and high SSA led to a 2.4-fold acceleration of cement consolidation and a 36.9% decrease of the porosity of the composite. These features could be attributed to additive-matrix interactions, with the LDH memory effect playing key roles in the cement crystal seed process and in competition for the absorption of free water within the cement paste. Therefore, the unprecedent results obtained suggest that the quantity and SSA of MO are key parameters to fine-tune the paste rheology and structure of hidrated cement. The MO materials showed easy adaptability and excellent potential for use as multifunctional additives in the production of eco-friendly, high-performance cement paste formulations with controllable properties according to the desired application.
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Affiliation(s)
- Caio C Dos Santos
- Chemistry Institute of São Paulo State University (UNESP), Araraquara 14800-900, SP, Brazil
| | - Adriana A Almeida
- Chemistry Institute of São Paulo State University (UNESP), Araraquara 14800-900, SP, Brazil
| | - Sandra H Pulcinelli
- Chemistry Institute of São Paulo State University (UNESP), Araraquara 14800-900, SP, Brazil
| | - Celso V Santilli
- Chemistry Institute of São Paulo State University (UNESP), Araraquara 14800-900, SP, Brazil
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2
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Momeni S, Ghorbani-Vaghei R. Copper Immobilized on Modified LDHs as a Novel Efficient Catalytic System for Three-Component Synthesis of Pyrano[2,3- d]pyrimidine and pyrazolo[4',3':5,6]pyrano[2,3- d]pyrimidine Derivatives. ACS OMEGA 2024; 9:10332-10342. [PMID: 38463312 PMCID: PMC10918776 DOI: 10.1021/acsomega.3c07913] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Revised: 01/31/2024] [Accepted: 02/09/2024] [Indexed: 03/12/2024]
Abstract
A novel catalyst based on layered double hydroxides coated with copper nitrate [LDH@(3-chloropropyl)trimethoxysilane@N1,N4-bis(4,6-diamino-1,3,5-triazin-2-yl)benzene-1,4-disulfonamide@Cu] was successfully synthesized. The structure of the new synthesized catalyst was investigated and confirmed using different analytical techniques, such as Fourier-transform infrared spectroscopy (FTIR), energy-scattered X-ray spectroscopy (EDX) mapping, X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), and heat gravity/heat derivatization (TGA/DSC). The skilled catalyst proved its efficiency for one-pot three-component synthesis of pyrano[2,3-d]pyrimidine and new dihydropyrazolo[4',3':5,6]pyrano[2,3-d]pyrimidine-dione derivatives. Using this efficient catalyst, products were synthesized with a high yield, in a short time, and under soft and solvent-free conditions. The catalyst can be recovered and reused four times without a significant loss of efficiency.
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Affiliation(s)
- Sarieh Momeni
- Department of Organic Chemistry,
Faculty of Chemistry and Petroleum Sciences, Bu-Ali Sina University, Hamedan 65174, Iran
| | - Ramin Ghorbani-Vaghei
- Department of Organic Chemistry,
Faculty of Chemistry and Petroleum Sciences, Bu-Ali Sina University, Hamedan 65174, Iran
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3
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Wang Y, Ying Z, Gao Y, Shi L. Layered Double Hydroxide Nanosheets: Synthesis Strategies and Applications in the Field of Energy Conversion. Chemistry 2024; 30:e202303025. [PMID: 37902103 DOI: 10.1002/chem.202303025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2023] [Revised: 10/24/2023] [Accepted: 10/25/2023] [Indexed: 10/31/2023]
Abstract
In recent years, layered double hydroxides (LDH) nanosheets have garnered substantial attention as intriguing inorganic anionic layered clay materials. These nanosheets have captured the attention of researchers due to their unique physicochemical properties. This review aims to showcase the latest advancements in laboratory research concerning LDH nanosheets, with a specific emphasis on their methods of preparation. This review provides detailed insights into the factors influencing the anionic conductivity of LDH, along with delineating the applications of LDH nanosheets in the realm of energy conversion. Notably, the review highlights the crucial role of LDH nanosheets in the oxygen evolution reaction (OER), a vital process in water splitting and diverse electrochemical applications. The review emphasizes the significant potential of LDH nanosheets in enhancing supercapacitor technology, owing to their high surface area and exceptional charge storage capacity. Additionally, it elucidates the prospective application of LDH nanosheets as anion exchange membranes in anion exchange membrane fuel cells, potentially revolutionizing fuel cell performance through improved efficiency and stability facilitated by enhanced ion transport properties.
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Affiliation(s)
- Yindong Wang
- Center of Nanomaterials for Renewable Energy (CNRE), School of Electrical Engineering State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, P. R. China
| | - Zhixuan Ying
- Center of Nanomaterials for Renewable Energy (CNRE), School of Electrical Engineering State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, P. R. China
| | - Yushuan Gao
- Center of Nanomaterials for Renewable Energy (CNRE), School of Electrical Engineering State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, P. R. China
| | - Le Shi
- Center of Nanomaterials for Renewable Energy (CNRE), School of Electrical Engineering State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, P. R. China
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4
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Li K, Yuan G, Dong L, Deng G, Duan H, Jia Q, Zhang H, Zhang S. Boehmite aerogel with ultrahigh adsorption capacity for Congo Red removal: Preparation and adsorption mechanism. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.122065] [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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5
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Li Z, Fang X, Yuan W, Zhang X, Yu J, Chen J, Qiu X. Preparing of layered double hydroxide- alginate microspheres for Cr(VI)-contaminated soil remediation. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.130655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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6
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Adsorptive Detoxification of Congo Red and Brilliant Green Dyes Using Chemically Processed Brassica Oleracea Biowaste from Waste Water. ADSORPT SCI TECHNOL 2022. [DOI: 10.1155/2022/9995335] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Water pollution being a potential risk to mankind is treated in several ways which includes chemical treatments. Among them, adsorption took a prominent position for the removal of many hazardous dyes from waste water. Here in this study, an environment-friendly, inexpensive, and broadly available leaves of Brassica oleracea were utilized for adsorption of two carcinogenic dyes, i.e., Congo red and brilliant green. The adsorbent Brassica oleracea leaves were collected, dried, and characterized by FTIR and SEM and then utilized in batch manner for dye removal. Isothermal modeling was carried out on data obtained after experiment which show the best fitting of Langmuir with
42.553 and 103.093 mg.g-1 for Congo red (CR) and brilliant green (BG), respectively. Consequently, a homogenous, monolayer mode of adsorption was followed. Kinetic modeling supported pseudosecond order and Elovich model in most suitable manner. It was also found that a spontaneous, exothermic process provided by the values of thermodynamic parameters (
,
, and
) was calculated.
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7
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Cornu D, Coustel R, Renaudin G, Rogez G, Renard A, Durand P, Carteret C, Ruby C. Synthesis and characterization of a new monometallic layered double hydroxide using manganese. Dalton Trans 2022; 51:11787-11796. [PMID: 35861427 DOI: 10.1039/d2dt01835g] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This article reports for the first time the synthesis of an LDH using only manganese as the divalent and trivalent metallic ion. Analysis of the pH, redox potential, and chemical composition during the oxidation of a manganese basic salt using persulfate indicates the oxidation of 1/3 of the initial MnII ions, in agreement with the paramagnetic structure and XPS analysis. Infrared, Raman spectra and thermogravimetric analysis results were similar to the ones obtained with Fe-LDH also known as green rust. X-Ray diffractograms and Rietveld refinement were used to determine the structure of this solid. Thermodynamic considerations predict that this solid could reduce nitrate into gaseous nitrogen without further reduction to ammonium or ammonia unlike what is observed for Fe-LDH.
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Affiliation(s)
- Damien Cornu
- Université de Lorraine, CNRS, LCPME, F-54000 Nancy, France.
| | - Romain Coustel
- Université de Lorraine, CNRS, LCPME, F-54000 Nancy, France.
| | - Guillaume Renaudin
- Université Clermont Auvergne, Clermont Auvergne INP, CNRS, ICCF, F-63000 Clermont-Ferrand, France
| | - Guillaume Rogez
- Université de Strasbourg, CNRS, IPCMS, F-67000 Strasbourg, France
| | | | | | | | - Christian Ruby
- Université de Lorraine, CNRS, LCPME, F-54000 Nancy, France.
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8
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Adsorptive Behavior of Tartaric Acid Treated Holarrhena antidysenterica and Citrullus colocynthis Biowastes for Decolourization of Congo Red Dye from Aqueous Solutions. J CHEM-NY 2022. [DOI: 10.1155/2022/5724347] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The aim of the present work is to eradicate Congo red (CR) dye from aqueous solutions since the dye compounds are harmful to human life and the environment leading to detrimental results. For this purpose, Holarrhena antidysenterica (HA) and Citrullus colocynthis (CC) adsorbents were used for the adsorptive removal of Congo red dye from wastewaters. The unmodified adsorbents (U-HA and U-CC) were chemically modified using tartaric acid (TA). Morphological structures were examined by FTIR and SEM. Batch adsorption studies were tested at a variety of pH, time exposure, temperatures, and adsorbent dosages. Thermodynamic parameters such as Gibbs free energy (
), enthalpy (
), entropy changes (
), and energy of activation (
) were also calculated. The results revealed that tartaric acid-Citrullus colocynthis (TA-CC) gave optimum conditions of time of contact (35 min), temperature conditions (40°C), pH (3), and dosage of adsorbent (1.6 g) for maximum dye removal. Tartaric acid-Holarrhena antidysenterica (TA-HA) gave equilibrium time of contact (30 min), temperature (40°C), and pH optimum (2) along with a 1.6 g dosage of adsorbent. Mechanistic understanding of adsorption isotherm provided that the Langmuir model was followed by raw and modified adsorbents. Maximum adsorption capacities
attained were 60.61 (mg g-1), 128.21 (mg g-1), 87.71 (mg g-1), and 131.57 (mg g-1), respectively, for U-HA, TA-HA, U-CC, and TA-CC. The results of kinetic modeling displayed a high value of
(0.99) along with minimal error (RMSE) for dye removal showing that the pseudo-second-order kinetic model has acceptable accuracy. Fourier transform infrared proposed the electrostatic, pi-pi interactions, and hydrogen bonding as dominant adsorption mechanisms at acidic pH, respectively. Rate-determining steps comprise both surface and intraparticle diffusions. Thermodynamics indicated that the dye adsorption of CR is spontaneous, exothermic, and favorable in nature. These agricultural wastes due to specific points such as low cost, availability, and high removal rates of adsorption are highly competent for the expulsion of anionic dye like CR from wastewaters.
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9
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Wang X, Cheng B, Zhang L, Yu J, Li Y. Synthesis of MgNiCo LDH hollow structure derived from ZIF-67 as superb adsorbent for Congo red. J Colloid Interface Sci 2022; 612:598-607. [PMID: 35016020 DOI: 10.1016/j.jcis.2021.12.176] [Citation(s) in RCA: 34] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Revised: 12/25/2021] [Accepted: 12/27/2021] [Indexed: 11/30/2022]
Abstract
Adsorption materials with large specific surface area and porous structures exert a beneficial impact on improving the adsorption performance. In this work, MgNiCo LDH hollow structure (MNC HS) is fabricated through a simple one-step solvothermal method using ZIF-67 as the sacrificial template. Electron microscopy shows that the MNC HS retains the dodecahedral shape of ZIF-67. The as-prepared sample exhibits efficient adsorption for Congo red (CR) in water, which is due to the hierarchical structure and large specific surface area that provides more adsorption sites and electrostatic interaction. The CR adsorption process fits the pseudo-second-order model better by kinetics simulation; while Langmuir model is more accurate than Freundlich model in describing the adsorption isotherms of CR. The maximum adsorption capacity calculated by the Langmuir model can reach 1194.7 mg g-1, which is much higher than that of the sample MgNiCo LDH (MNC) synthesized by conventional methods. The cycle tests also show that the as-prepared adsorbent has good stability and recycling ability.
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Affiliation(s)
- Xing Wang
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, PR China
| | - Bei Cheng
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, PR China
| | - Liuyang Zhang
- Laboratory of Solar Fuel, Faculty of Materials Science and Chemistry, China University of Geosciences, 388 Lumo Road, Wuhan 430074, PR China.
| | - Jiaguo Yu
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, PR China; Laboratory of Solar Fuel, Faculty of Materials Science and Chemistry, China University of Geosciences, 388 Lumo Road, Wuhan 430074, PR China.
| | - Youji Li
- College of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, Hunan, PR China
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10
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Liu H, Wang S, Gao H, Yang H, Wang F, Chen X, Fang L, Tang S, Yi Z, Li D. A simple polyacrylamide gel route for the synthesis of MgAl2O4 nanoparticles with different metal sources as an efficient adsorbent: Neural network algorithm simulation, equilibrium, kinetics and thermodynamic studies. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2021.119855] [Citation(s) in RCA: 30] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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11
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Tang B, Peng G, Luo D, Zhou X. Preparation and Adsorption Properties of Soybean Dreg/Hydrocalumite Composites. ACS OMEGA 2021; 6:27491-27500. [PMID: 34693170 PMCID: PMC8529653 DOI: 10.1021/acsomega.1c04460] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2021] [Accepted: 09/28/2021] [Indexed: 05/24/2023]
Abstract
The application of biomass-based composites in the field of adsorption has attracted extensive attention. Herein, soybean dreg/hydrocalumite composites were prepared by in situ self-assembly from soybean dregs and applied to the adsorption of Congo Red (CR). The composites were characterized by scanning electron microscopy, X-ray diffraction, Fourier infrared spectroscopy, and N2 physical adsorption-desorption. The results showed that the adsorption property of soybean dregs/hydrocalumite for CR was better than that of soybean dregs or hydrocalumite. Effects of preparation and adsorption conditions on the adsorption of CR by soybean dregs/hydrocalumite were also investigated. The removal rate of soybean dregs/hydrocalumite (30%BD-LDH) prepared under the optimized conditions reached 97.4% with a 486.8 mg·g-1 adsorption capacity. Also, the adsorption capacity of 30%BD-LDH was about 2.4 times and 3.0 times that of hydrocalumite and soybean dregs, respectively. In addition, the adsorption process of CR by 30%BD-LDH was more in line with the pseudo-second-order kinetic and Langmuir isothermal models.
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Affiliation(s)
- Bei Tang
- Department
of Food and Chemical Engineering, Shaoyang
University, Shaoyang, Hunan 422000, P. R. China
| | - Guanping Peng
- Department
of Food and Chemical Engineering, Shaoyang
University, Shaoyang, Hunan 422000, P. R. China
| | - Deyi Luo
- Hunan
Provincial Key Laboratory of Soybean Products Processing and Safety
Control, Shaoyang, Hunan 422000, P.
R. China
| | - Xi Zhou
- Department
of Food and Chemical Engineering, Shaoyang
University, Shaoyang, Hunan 422000, P. R. China
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12
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Shlar I, Poverenov E. A nanohybrid layered double hydroxide as an effective carrier for delivery and application of the phytohormone indole acetic acid. Colloids Surf B Biointerfaces 2021; 207:112032. [PMID: 34412012 DOI: 10.1016/j.colsurfb.2021.112032] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2021] [Revised: 08/08/2021] [Accepted: 08/09/2021] [Indexed: 01/10/2023]
Abstract
The increasing need for agricultural production on the one hand, and requirements for greener and more sustainable agricultural practices on the other, have led to a growing demand for efficient and eco-friendly materials for the delivery of agrochemicals. Here we describe, the use of layered double hydroxide (LDH) particles as a carrier for a plant hormone. Magnesium-aluminum LDH intercalated with indole-3-acetic acid (IAA) was synthesized by co-precipitation method, characterized, and examined for real-life applications. Scanning electron microscopy revealed that both pristine and IAA-intercalated LDH particles exhibit hexagonal platelet morphology. X-ray diffraction showed a hydrotalcite-like structure and, together with Fourier transform infrared spectroscopy, verified the efficacious intercalation of IAA anions. The intercalation protected the IAA from enzymatic degradation and allowed its sustained release, as demonstrated by enzymatic stability and release tests, correspondingly. In-vivo assay revealed that intercalation inside LDH significantly increases the biological activity of IAA in promoting adventitious root development in plant cuttings. Results demonstrate the applicability of LDH as an advanced, effective, and sustainable carrier that overcomes the practical limitations of agrochemicals and significantly enhances their efficiency.
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Affiliation(s)
- Ilya Shlar
- Agro-Nanotechnology and Advanced Materials Research Center, Department of Food Science, Agricultural Research Organization, The Volcani Institute, P.O.B 15159, Rishon Lezion 7505101, Israel; Institute of Biochemistry, Food Science and Nutrition, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot 76100, Israel
| | - Elena Poverenov
- Agro-Nanotechnology and Advanced Materials Research Center, Department of Food Science, Agricultural Research Organization, The Volcani Institute, P.O.B 15159, Rishon Lezion 7505101, Israel.
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13
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Adsorption performance of calcined copper-aluminum layered double hydroxides/CNT/PVDF composite films toward removal of carminic acid. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.115558] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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14
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Adsorptive Separation of Brilliant Green Dye from Water by Tartaric Acid-Treated Holarrhena antidysenterica and Citrullus colocynthis Biowaste. J CHEM-NY 2021. [DOI: 10.1155/2021/6636181] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Holarrhena antidysenterica (Ha) and Citrullus colocynthis (Cc) biowaste from indigenous Pakistan resources was used to remove toxic brilliant green (BG) dye from aqueous solutions in a batch mode. Tartaric acid chemical modification gave promising results than the nonmodified forms of biowaste. Surface characterization was carried out by FT-IR and SEM. The optimum conditions for (BG) dye elimination by Ha-tartaric acid modified (Ha-Ta) were 1.8 g, 45 minutes, 4.0 pH; 40°C, and 100 rpm and with Cc-tartaric acid modified (Cc-Ta) were 1.6 g, 45 minutes, 6.0 pH; 40°C, and 150 rpm dye solution shaking rate, which gave optimum results. Equilibrium data of raw and chemically modified biowaste followed the Langmuir model indicating monolayer chemisorption. Qmax values were found to be 55.24 mg/g, 112.35 mg/g, 50.50 mg/g, and 79.36 mg/g for Ha, Ha-Ta, Cc, and Cc-Ta. Kinetics followed the pseudo-second-order kinetic model. Dye removal involved surface and intraparticle mode of diffusion. Thermodynamic studies proved the process to be spontaneous and exothermic one. The adsorbents can be effectively utilized for the removal of toxic basic dyes, such as BG from wastewaters.
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15
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Tartaric Acid-Modified Holarrhena antidysenterica and Citrullus colocynthis Biowaste for Efficient Eradication of Crystal Violet Dye from Water. J CHEM-NY 2020. [DOI: 10.1155/2020/8862167] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Two novel adsorbents Holarrhena antidysenterica (HA) and Citrullus colocynthis (CC) were collected from native Pakistan and treated with tartaric acid. The adsorbents were characterized by Fourier-transform infrared spectroscopy (FT-IR) and scanning electron microscopy, and their adsorptive behavior was studied against model cationic dye crystal violet (CV). Role of biosorbent dose, time of contact, temperature studies, agitation rates, and solution pH was investigated. Optimum conditions obtained for the removal of CV dye for H. antidysenterica-tartaric acid modified (HA-TA) were as follows: 0.8 g adsorbent dose, 35 minutes contact time, 5.0 pH, 40°C temperature, and 150 rpm agitation rates as compared to H. antidysenterica that gave 1.4 g adsorbent dose, 40 minutes time of contact, 6.0 pH, 50°C temperature, and 150 rpm agitation speed. C. colocynthis-tartaric acid modified (CC-TA) removed CV dye at 0.6 g adsorbent dose, 30 minutes contact interval, 4.0 pH, 40°C temperature, and 125 rpm agitation speed in contrast to C. colocynthis which gave 0.8 g adsorbent dose, 40 minutes time of contact, 6.0 pH, 50°C temperature, and 125 rpm agitation speed, respectively. Isothermal studies for both raw and modified biosorbents were compliant with the Langmuir model indicating monolayer, chemisorption. The maximum Langmuir capacities were up to 128.20 mg/g, 136.98 mg/g, 144.92 mg/g, and 166.66 mg/g for HA, CC, HA-TA, and CC-TA. Pseudo-second-order kinetic model well fitted the dye removal data. The rate-determining steps involved both surface and intraparticle diffusion mechanisms. Adsorption of dye molecules on active surfaces was governed by electrostatic attractions and chelating abilities. Thermodynamics research revealed the spontaneous and exothermic nature of the reaction. The adsorbents serve promising candidates for the effective removal of hazardous dyes from aqueous solutions.
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16
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Rathee G, Kohli S, Panchal S, Singh N, Awasthi A, Singh S, Singh A, Hooda S, Chandra R. Fabrication of a Gold-Supported NiAlTi-Layered Double Hydroxide Nanocatalyst for Organic Transformations. ACS OMEGA 2020; 5:23967-23974. [PMID: 32984717 PMCID: PMC7513357 DOI: 10.1021/acsomega.0c03250] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Accepted: 09/02/2020] [Indexed: 05/11/2023]
Abstract
This work is mainly focused on the synthesis of an efficient and reusable heterogeneous Au/NiAlTi layered double hydroxide (LDH) nanocatalyst and its applications in the preparation of biologically important xanthene, 1,4-dihydropyridine, polyhydroquinoline, and 4H-pyran derivatives. NiAlTi LDH was designed hydrothermally and then gold was supported over the surface of LDH by using ion-exchange and NaBH4 reduction methods. The synthesized nanocatalyst was physicochemically characterized by X-ray diffractrometry, Fourier-transform infrared spectroscopy, thermogravimetric analysis, scanning electron microscopy, and transmission electron microscopy (TEM). The TEM images confirmed the support of gold nanoparticles over the surface of LDH with a size distribution of 7-9 nm. The well-characterized nanocatalyst was tested for the synthesis of biologically important xanthene, 1,4-dihydropyridine, polyhydroquinoline, and 4H-pyran derivatives. The advantages obtained were excellent yields in a lesser reaction time. Stability and reusability were also accessed; the catalyst was stable even after five cycles. High catalytic efficiency, easy fabrication, and recycling ability of Au/NiAlTi LDH make it a potential catalyst for the synthesis of xanthene, 1,4-dihydropyridine, polyhydroquinoline, and 4H-pyran derivatives.
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Affiliation(s)
- Garima Rathee
- Drug
Discovery & Development Laboratory, Department of Chemistry, University of Delhi, Delhi 110007, India
| | - Sahil Kohli
- Drug
Discovery & Development Laboratory, Department of Chemistry, University of Delhi, Delhi 110007, India
| | - Sagar Panchal
- Drug
Discovery & Development Laboratory, Department of Chemistry, University of Delhi, Delhi 110007, India
| | - Nidhi Singh
- Drug
Discovery & Development Laboratory, Department of Chemistry, University of Delhi, Delhi 110007, India
| | - Amardeep Awasthi
- Drug
Discovery & Development Laboratory, Department of Chemistry, University of Delhi, Delhi 110007, India
| | - Snigdha Singh
- Drug
Discovery & Development Laboratory, Department of Chemistry, University of Delhi, Delhi 110007, India
| | - Aarushi Singh
- Drug
Discovery & Development Laboratory, Department of Chemistry, University of Delhi, Delhi 110007, India
| | - Sunita Hooda
- Department
of Chemistry, Acharya Narendra Dev College, University of Delhi, Delhi 110019, India
| | - Ramesh Chandra
- Drug
Discovery & Development Laboratory, Department of Chemistry, University of Delhi, Delhi 110007, India
- Dr.
B. R. Ambedkar Centre for Biomedical Research, University of Delhi, Delhi 110007, India
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Li A, Deng H, Ye C, Jiang Y. Fabrication and Characterization of Novel ZnAl-Layered Double Hydroxide for the Superadsorption of Organic Contaminants from Wastewater. ACS OMEGA 2020; 5:15152-15161. [PMID: 32637788 PMCID: PMC7331050 DOI: 10.1021/acsomega.0c01092] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Accepted: 05/28/2020] [Indexed: 05/05/2023]
Abstract
An imidazole ester skeleton (zeolitic imidazolate framework (ZIF)) was grown on the surface of a ZnAl-layered double hydroxide (ZnAl-LDH) material to form a porous composite (ZIF-ZnAl-LDH). To understand the adsorption characteristics of the two materials, the effects of pH, adsorption time, and adsorption concentration on the adsorption of Congo red (CR) solution were investigated comprehensively. In addition, ZnAl-LDH and ZIF-ZnAl-LDH were characterized by Fourier transform infrared (FTIR), X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), and X-ray photoelectron spectroscopy (XPS). The results clearly showed that ZnAl-LDH had a lamellar structure with a diameter of approximately 200-500 nm and ZIF-ZnAl-LDH had a regular three-dimensional hexagonal structure. The kinetics and thermodynamics of the CR adsorption by ZnAl-LDH and ZIF-ZnAl-LDH can be described using pseudo-second-order (PSO) and Langmuir models, respectively. The highest value of adsorption capacity obtained from the Langmuir equation was equal to 625.00 and 909.09 mg/g for these two compounds, respectively. The values of the standard Gibbs free energy (ΔG°), entropy (ΔS°), and enthalpy (ΔH°) obtained for these adsorption processes prove that the adsorption of CR by ZnAl-LDH and ZIF-ZnAl-LDH is a spontaneous endothermic process. Furthermore, through the analysis of the characterization results, it is concluded that the adsorption mechanisms of ZnAl-LDH and ZIF-ZnAl-LDH on CR are mainly dominated by electrostatic action, functional group action, surface pore adsorption, and anion exchange.
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Affiliation(s)
- Anyu Li
- Key
Laboratory of Ecology of Rare and Endangered Species and Environmental
Protection, Ministry of Education, Guangxi
Normal University, Guilin 541004, China
- College
of Environment and Resources, Guangxi Normal
University, Guilin 541004, China
| | - Hua Deng
- Key
Laboratory of Ecology of Rare and Endangered Species and Environmental
Protection, Ministry of Education, Guangxi
Normal University, Guilin 541004, China
- College
of Environment and Resources, Guangxi Normal
University, Guilin 541004, China
- . The University Key Laboratory
of Karst Ecology and Environmental
Change of Guangxi Province, College of Environment and Resources,
Guangxi Normal University, Guilin 541006, China
| | - Chenghui Ye
- Key
Laboratory of Ecology of Rare and Endangered Species and Environmental
Protection, Ministry of Education, Guangxi
Normal University, Guilin 541004, China
- College
of Environment and Resources, Guangxi Normal
University, Guilin 541004, China
| | - Yanhong Jiang
- Key
Laboratory of Ecology of Rare and Endangered Species and Environmental
Protection, Ministry of Education, Guangxi
Normal University, Guilin 541004, China
- College
of Environment and Resources, Guangxi Normal
University, Guilin 541004, China
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