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Flores-Valenzuela J, Leal-Perez JE, Almaral-Sanchez JL, Hurtado-Macias A, Borquez-Mendivil A, Vargas-Ortiz RA, Garcia-Grajeda BA, Duran-Perez SA, Cortez-Valadez M. Structural Analysis of Cu + and Cu 2+ Ions in Zeolite as a Nanoreactor with Antibacterial Applications. ACS OMEGA 2023; 8:30563-30568. [PMID: 37636981 PMCID: PMC10448675 DOI: 10.1021/acsomega.3c03869] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/01/2023] [Accepted: 07/27/2023] [Indexed: 08/29/2023]
Abstract
In this work, we report the structural analysis of Cu+ and Cu2+ ions in zeolite as a nanoreactor with antibacterial applications. A simple one-step process was implemented to obtain Cu ions in zeolite A (ZA4) by controlling the temperature in the solutions to guarantee the ions' stability. Samples were characterized by scanning electron microscopy, energy-dispersive X-ray spectroscopy, and Fourier transform infrared (FT-IR) spectroscopy, showing the characteristic zeolite elements as well as the characteristic bands with slight modifications in the chemical environment of the zeolite nanoreactor attributed to Cu ions by FT-IR spectroscopy. In addition, a shift of the characteristic peaks of ZA4 in X-ray diffraction was observed as well as a decrease in relative peak intensity. On the other hand, the antibacterial activity of Cu ions in the zeolite nanoreactor was evaluated.
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Affiliation(s)
- J. Flores-Valenzuela
- Universidad
Autónoma de Sinaloa, Fuente de Poseidón y Prol. Ángel
Flores S/N, Los Mochis, Sinaloa 81223, México
| | - J. E. Leal-Perez
- Universidad
Autónoma de Sinaloa, Fuente de Poseidón y Prol. Ángel
Flores S/N, Los Mochis, Sinaloa 81223, México
| | - J. L. Almaral-Sanchez
- Universidad
Autónoma de Sinaloa, Fuente de Poseidón y Prol. Ángel
Flores S/N, Los Mochis, Sinaloa 81223, México
| | - A. Hurtado-Macias
- Centro
de Investigación en Materiales Avanzados, S. C., Miguel de Cervantes #120,
Complejo Industrial Chihuahua, Chihuahua, Chihuahua 31136, México
| | - A. Borquez-Mendivil
- Universidad
Autónoma de Sinaloa, Fuente de Poseidón y Prol. Ángel
Flores S/N, Los Mochis, Sinaloa 81223, México
| | - R. A. Vargas-Ortiz
- Universidad
Autónoma de Sinaloa, Fuente de Poseidón y Prol. Ángel
Flores S/N, Los Mochis, Sinaloa 81223, México
| | - B. A. Garcia-Grajeda
- Universidad
Autónoma de Sinaloa, Fuente de Poseidón y Prol. Ángel
Flores S/N, Los Mochis, Sinaloa 81223, México
| | - S. A. Duran-Perez
- Doctorado
en Biotecnología, Facultad de Ciencias Químico Biológicas, Universidad Autónoma de Sinaloa, Calzada de las Americas Norte #2771, Burócrata, Culiacán Rosales, Sinaloa 80030, México
| | - Manuel Cortez-Valadez
- Departamento
de Investigación en Física, Universidad de Sonora, Apdo. Postal 5-88, Hermosillo, Sonora 83190, México
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Yang N, Gou L, Bai Z, Cheng F, Guo M, Zhang M. A Simple and Mild Synthesis of Zeolite Y from Bauxite Tailings for Lead Adsorption: Reusable, Efficient and Highly Selective. J Inorg Organomet Polym Mater 2022. [DOI: 10.1007/s10904-022-02377-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Lei L, Cui X, Li C, Dong M, Huang R, Li Y, Li Y, Li Z, Wu J. The cadmium decontamination and disposal of the harvested cadmium accumulator Amaranthus hypochondriacus L. CHEMOSPHERE 2022; 286:131684. [PMID: 34346323 DOI: 10.1016/j.chemosphere.2021.131684] [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: 05/10/2021] [Revised: 07/22/2021] [Accepted: 07/25/2021] [Indexed: 06/13/2023]
Abstract
The heavy metal accumulated biomass after phytoremediation needs to be decontaminated before disposal. Liquid extraction is commonly used to remove and recycle toxic heavy metals from contaminated biomass. In this study, we examined the cadmium (Cd) removal efficiency using different chemical reagents (hydrochloric acid, nitric acid, sulfuric acid, and ethylenediaminetetraacetic acid disodium) of the post-harvest Amaranthus hypochondriacus L. biomass. The purifications for the extracted liquids and ecological risk assessments for the extracted residues were also investigated. We have found that 77.8% of Cd in stems and 62.1% of Cd in leaves were removed by 0.25 M HCl after 24 h. In addition, K2CO3, KOH, and 4 Å molecular sieve could remove ≥89.0% of Cd in the extracted liquids. Finally, after we returned the extracted residues to the earthworm-incubated soil, the extracted biomass negatively affected the growth (weight loss ≥ 11.0%) and survival (mortality ≥ 33.3%) of Eisenia fetida. It should be noted that earthworms decreased soil available Cd concentrations from 0.14-0.05 mg kg-1 to 0.11-0.04 mg kg-1 and offset the negative effects of the Cd-contaminated biomass on soil microbes. Overall, given the cost of reagents, the Cd removal efficiency, and the ecological risks of the extracted biomass, using 0.25 M HCl for liquid extraction and K2CO3 for purification should be recommended. This work highlights the potential of liquid extraction for immediately and directly removing the Cd from fresh contaminated accumulator biomass and the resource cycling potential of the extracted liquids and biomass after purification.
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Affiliation(s)
- Long Lei
- Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Xiaoying Cui
- Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Cui Li
- Northwestern Polytechnical University, School of Ecology and Environment, Xi'an, 710072, China
| | - Meiliang Dong
- Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Rong Huang
- Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Yongxing Li
- Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650, China
| | - Yingwen Li
- Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650, China
| | - Zhian Li
- Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650, China; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, 511458, China.
| | - Jingtao Wu
- Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650, China.
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Preparation and characterization of zeolite from waste Linz-Donawitz (LD) process slag of steel industry for removal of Fe3+ from drinking water. ADV POWDER TECHNOL 2021. [DOI: 10.1016/j.apt.2021.07.023] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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5
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Smičiklas I, Coha I, Jović M, Nodilo M, Šljivić-Ivanović M, Smiljanić S, Grahek Ž. Efficient separation of strontium radionuclides from high-salinity wastewater by zeolite 4A synthesized from Bayer process liquids. Sci Rep 2021; 11:1738. [PMID: 33462266 PMCID: PMC7814134 DOI: 10.1038/s41598-021-81255-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Accepted: 01/01/2021] [Indexed: 01/29/2023] Open
Abstract
The efficient, selective, and economical sorbents for the removal of Sr radionuclides are largely needed for the decontamination of effluents with high salinity. In this study, the removal of Sr was investigated using the zeolite produced from the Bayer process liquids. Based on the XRD, SEM/EDS analysis, the product was pure and highly crystalline zeolite 4A (Z4A). Removal of Sr was fast (5 min for 100% removal at 8.80 mg/L), with high maximum sorption capacity (252.5 mg/L), and independent on the initial pH in the range 3.5-9.0. Specific sorption of Sr by protonated groups on the Z4A surface was operating in addition to ion-exchange with Na ions. The selectivity of Z4A decreased in the order Sr > Ca > K > Mg > Na. 84% of Sr was separated from seawater within 5 min, at the Z4A dose of 5 g/L, while efficiency increased to 99% using the dose of 20 g/L. Desorption of radioisotope 89Sr from seawater/Z4A solid residue was very low in deionized water (0.1-0.2%) and groundwater (0.7%) during 60 days of leaching. Z4A is a cost-effective, selective, and high-capacity medium for Sr removal, which provides high stability of retained radionuclides.
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Affiliation(s)
- Ivana Smičiklas
- grid.7149.b0000 0001 2166 9385“VINČA” Institute of Nuclear Sciences, National Institute of the Republic of Serbia, University of Belgrade, Mike Petrovića Alasa 12-14, 11001 Belgrade, Serbia
| | - Ivana Coha
- grid.4905.80000 0004 0635 7705Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia
| | - Mihajlo Jović
- grid.7149.b0000 0001 2166 9385“VINČA” Institute of Nuclear Sciences, National Institute of the Republic of Serbia, University of Belgrade, Mike Petrovića Alasa 12-14, 11001 Belgrade, Serbia
| | - Marijana Nodilo
- grid.4905.80000 0004 0635 7705Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia
| | - Marija Šljivić-Ivanović
- grid.7149.b0000 0001 2166 9385“VINČA” Institute of Nuclear Sciences, National Institute of the Republic of Serbia, University of Belgrade, Mike Petrovića Alasa 12-14, 11001 Belgrade, Serbia
| | - Slavko Smiljanić
- grid.449657.d0000 0000 9873 714XUniversity of East Sarajevo, Faculty of Technology , Karakaj 34A, 75400 Zvornik, Republic of Srpska Bosnia and Herzegovina
| | - Željko Grahek
- grid.4905.80000 0004 0635 7705Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia
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Harja M, Buema G, Lupu N, Chiriac H, Herea DD, Ciobanu G. Fly Ash Coated with Magnetic Materials: Improved Adsorbent for Cu (II) Removal from Wastewater. MATERIALS (BASEL, SWITZERLAND) 2020; 14:E63. [PMID: 33375597 PMCID: PMC7795148 DOI: 10.3390/ma14010063] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Revised: 12/17/2020] [Accepted: 12/21/2020] [Indexed: 01/14/2023]
Abstract
Fly ash/magnetite material was used for the adsorption of copper ions from synthetic wastewater. The obtained material was characterized by scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDAX), X-ray diffractometer (XRD), Fourier transform infrared spectroscopy (FTIR), Brunauer-Emmett-Teller (BET) surface area, and vibrating sample magnetometer (VSM). Batch adsorption experiments were employed in order to investigate the effects of adsorbent dose, initial Cu (II) concentration and contact time over adsorption efficiency. The experimental isotherms were modeled using Langmuir (four types of its linearization), Freundlich, Temkin, and Harkins-Jura isotherm models. The fits of the results are estimated according to the Langmuir isotherm, with a maximum adsorption capacity of 17.39 mg/g. The pseudo-second-order model was able to describe kinetic results. The data obtained throughout the study prove that this novel material represents a potential low-cost adsorbent for copper adsorption with improved adsorption capacity and magnetic separation capability compared with raw fly ash.
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Affiliation(s)
- Maria Harja
- Chemical Engineering Department, Faculty of Chemical Engineering and Environmental Protection, “Gheorghe Asachi” Technical University of Iasi, 73 Prof.dr.doc. Dimitrie Mangeron Street, 700050 Iasi, Romania;
| | - Gabriela Buema
- National Institute of Research and Development for Technical Physics, 47 Mangeron Boulevard, 700050 Iasi, Romania; (N.L.); (H.C.); (D.D.H.)
| | - Nicoleta Lupu
- National Institute of Research and Development for Technical Physics, 47 Mangeron Boulevard, 700050 Iasi, Romania; (N.L.); (H.C.); (D.D.H.)
| | - Horia Chiriac
- National Institute of Research and Development for Technical Physics, 47 Mangeron Boulevard, 700050 Iasi, Romania; (N.L.); (H.C.); (D.D.H.)
| | - Dumitru Daniel Herea
- National Institute of Research and Development for Technical Physics, 47 Mangeron Boulevard, 700050 Iasi, Romania; (N.L.); (H.C.); (D.D.H.)
| | - Gabriela Ciobanu
- Chemical Engineering Department, Faculty of Chemical Engineering and Environmental Protection, “Gheorghe Asachi” Technical University of Iasi, 73 Prof.dr.doc. Dimitrie Mangeron Street, 700050 Iasi, Romania;
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Synthesis of Zeolites from Greek Fly Ash and Assessment of Their Copper Removal Capacity. MINERALS 2020. [DOI: 10.3390/min10100844] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The objective of this study was to synthesize zeolites through fusion of lignite fly ash and NaOH or KOH pellets at 600 °C and assess their removal efficiency in terms of decontamination of solutions containing Cu(II) ions. The removal efficiency of the produced zeolites was tested in batch kinetic experiments using different zeolites and Cu(II) ion concentrations. Experimental data revealed that zeolites synthesized with the use of NaOH exhibited higher removal efficiency compared with those synthesized with the use of KOH. Kinetic data showed that the pseudo-second-order equations described well the removal process. Copper removal was mainly accomplished through the concerted action of chemisorption and intraparticle diffusion. Analytical techniques involving XRF, XRD, FTIR, SEM/EDS and XPS were used for the characterization and morphology analysis of the produced zeolites. SEM/EDS confirmed the presence of copper on the zeolite surface. XPS spectra of Cu2p at 934.3 eV proved the presence of Cu(II) oxidation state, confirming the possible formation of CuO and/or Cu-Cl.
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Liu W, Singh RP, Jothivel S, Fu D. Evaluation of groundwater hardness removal using activated clinoptilolite. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:17541-17549. [PMID: 31485935 DOI: 10.1007/s11356-019-06193-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2019] [Accepted: 08/09/2019] [Indexed: 06/10/2023]
Abstract
Current study aimed to investigate modified natural clinoptilolite for removal of calcium and magnesium from the groundwater. Feasibility of clinoptilolite for groundwater hardness removal in production and operation was verified by static adsorption experiment and the experiment of fixed bed and degasification column. Subsequently, the main parameters for groundwater treatment using clinoptilolite were also explored. Results show that in the process of clinoptilolite in adsorption is dominant reaction process. The adsorption equilibrium time was unchanged when the hardness of raw water changes from 450 to 550 mg/L. With respect to comparative analysis of price and performance, NaCl found to be the most suitable clinoptilolite regenerated agent. The adsorption efficiency was high when the residence time was 20-25 min in the pilot experiments. The reaction mechanism was mainly substitution reaction according to ion equilibrium, and the treatment capacity of the degasifier combined with the fixed bed was 20% higher than that of with only fixed bed.
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Affiliation(s)
- Weixing Liu
- School of Civil Engineering, Southeast University, Nanjing, 211189, China
- Southeast University-Monash Joint Research Centre for Future Cities, Nanjing, 211189, China
| | - Rajendra Prasad Singh
- School of Civil Engineering, Southeast University, Nanjing, 211189, China
- Southeast University-Monash Joint Research Centre for Future Cities, Nanjing, 211189, China
| | | | - Dafang Fu
- School of Civil Engineering, Southeast University, Nanjing, 211189, China.
- Southeast University-Monash Joint Research Centre for Future Cities, Nanjing, 211189, China.
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Wang Z, Tan K, Cai J, Hou S, Wang Y, Jiang P, Liang M. Silica oxide encapsulated natural zeolite for high efficiency removal of low concentration heavy metals in water. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2018.10.065] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Kazi IW, Ullah N, Ali SA. A New Resin Containing Aminopropylphosphonate Chelating Ligand for High-Performance Mitigation of Heavy Metal Ions. ChemistrySelect 2018. [DOI: 10.1002/slct.201803045] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Izzat W. Kazi
- Chemistry Department; King Fahd University of Petroleum & Minerals; Dhahran 31261 Saudi Arabia
| | - Nisar Ullah
- Chemistry Department; King Fahd University of Petroleum & Minerals; Dhahran 31261 Saudi Arabia
| | - Shaikh A. Ali
- Chemistry Department; King Fahd University of Petroleum & Minerals; Dhahran 31261 Saudi Arabia
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Wu Z, Xie J, Liu H, Chen T, Cheng P, Wang C, Kong D. Preparation, characterization, and performance of 4A zeolite based on opal waste rock for removal of ammonium ion. ADSORPT SCI TECHNOL 2018. [DOI: 10.1177/0263617418803012] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
In this study, 4A zeolite was prepared from opal waste rock by hydrothermal method and applied in ammonium ion adsorption. To optimize synthesis conditions, the effect of crystallization time (1–8 h), crystallization temperature (65–115°C), Na2O/SiO2 (0.6–2.0), H2O/Na2O (20–70), and SiO2/Al2O3 (1.0–3.5) was investigated. X-ray diffraction, scanning electron microscope imaging, cation exchange capacity, static water adsorption, Fourier transform infrared spectroscopy, and N2 adsorption–desorption isotherm were used for assessing properties of 4A zeolite. Adsorption experiments were performed by 1.0 g l−1 4A zeolite with NH4+ solution (5–300 mg l−1) for 4 h at room temperature. The experiment results revealed with a crystallization time of 3 h, a crystallization temperature of 85°C, Na2O/SiO2=1.0, H2O/Na2O = 40, and SiO2/Al2O3=2.0, the 4A zeolite synthesized had excellent performance with cation exchange capacity of 2.93 mmol (g dry zeolite)−1 and static water adsorption of 22.3%. The adsorption process was described by Freundlich model (R2>0.99) and the maximum adsorption capacity could reach to 53.11 mg g−1. The experimental results provided a novel approach for the utilization of opal waste rock, which is produced during the mining of opal-rich palygorskite, and for the synthesis of 4A zeolite and the removal of ammonium ion.
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Affiliation(s)
| | | | - Haibo Liu
- Hefei University of Technology, PR China
| | | | - Peng Cheng
- Hefei University of Technology, PR China
| | - Can Wang
- Hefei University of Technology, PR China
| | - Dianchao Kong
- Anhui Key Laboratory of Sewage Purification and Ecological Remediation Materials, PR China
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Synthesis of 4A Zeolite from Kaolinite-Type Pyrite Flotation Tailings (KPFT). MINERALS 2018. [DOI: 10.3390/min8080338] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
As a solid waste, kaolinite-type pyrite flotation tailings (KPFT) are a type of low-quality kaolin that contain impurities, such as iron and titanium. In this study, KPFT were calcined at 800 °C for two hours. The calcined production (CKPFT), which is mainly metakaolin, was used as the silicon and aluminum source to synthesize 4A zeolite (Na12[(AlO2)12(SiO2)12]·27H2O) via hydrothermal synthesis. The optimal hydrothermal synthesis conditions were determined from X-ray diffraction phase analysis, relative crystallinity (RC), and cation ion exchange capacity (CEC). The optimal hydrothermal synthesis conditions were determined to be a ratio of 5 g CKPFT, 6.5 g NaOH, 65 mL H2O, crystallization temperature 110 °C, and crystallization time of three hours. Under the optimal hydrothermal synthesis conditions, the RC and CEC of the synthesized 4A zeolite were 40.77% and 210.32 mg CaCO3·g−1, respectively. Further characterizations including pore size distribution, scanning electron microscopy, energy dispersive X-ray, thermogravimetry-differential scanning calorimetry, and Fourier transform infrared spectroscopy were performed. The results revealed that impurities in KPFT do not affect the synthesis of 4A zeolite. The surface morphology of the synthesized 4A zeolite was composed of chamfered-edged cubes with a particle size of one to three μm that was thermally stable up to approximately 890 °C.
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Bozorgi M, Abbasizadeh S, Samani F, Mousavi SE. Performance of synthesized cast and electrospun PVA/chitosan/ZnO-NH 2 nano-adsorbents in single and simultaneous adsorption of cadmium and nickel ions from wastewater. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:17457-17472. [PMID: 29656356 DOI: 10.1007/s11356-018-1936-z] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2018] [Accepted: 04/03/2018] [Indexed: 06/08/2023]
Abstract
The performance of synthesized cast and electrospun polyvinyl alcohol/chitosan/zinc oxide/aminopropyltriethoxylsilane (PVA/chitosan/ZnO-APTES) nano-adsorbents were compared in removal of Cd(II) and Ni(II) ions from wastewater. The adsorbents were characterized by SEM, BET, FTIR and TGA analyses. Furthermore, the swelling investigations were carried out to study the adsorbent stability in aqueous solution. The effect of several parameters such as contents of ZnO-NH2, contact time, initial Cd(II) and Ni(II) concentration and temperature on the adsorption capacity was investigated in a batch mode. In comparison with cast adsorbent, nanofiber adsorbent indicated the better adsorption performance. The experimental data well fitted the double-exponential kinetic model. In single metal ion system, the maximum adsorption capacity of nanofiber for Cd(II) and Ni(II) ions is estimated to be 1.239 and 0.851 mmol/g, respectively, much higher than qm of cast adsorbent for Cd(II) (0.625 mmol/g) and Ni(II) (0.474 mmol/g) ions. Thermodynamic parameters were investigated to identify the nature of adsorption process. In binary system of Cd(II)-Ni(II) ions, the inhibitory effect of competitive Cd(II) ion on the Ni(II) adsorption was greater than the inhibitory effect of competitive on the Cd(II) adsorption. The selectivity adsorption of both nanofiber and cast adsorbents was in order of Cd(II) > Ni(II).
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Affiliation(s)
- Mehran Bozorgi
- Faculty of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran
| | - Saeed Abbasizadeh
- Young Researchers and Elite Club, Marvdasht Branch, Islamic Azad University, Marvdasht, Iran.
| | - Faranak Samani
- Department of Polymer Engineering, Faculty of Chemical Engineering, Tarbiat Modares University, P.O. Box 14115-114, Tehran, Iran
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