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Influence of the Type and the Amount of Surfactant in Phillipsite on Adsorption of Diclofenac Sodium. Catalysts 2022. [DOI: 10.3390/catal13010071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Modified phillipsite samples were prepared with two different amounts (monolayer and bilayer coverage) of surfactants octadecyldimethylbenzylammonium chloride (O) and dodecylamine (D). Composites were characterized by Fourier transform infrared spectroscopy with attenuated total reflectance (FTIR–ATR), thermal analysis and determination of zeta potential, and subsequently tested for removal of diclofenac sodium (DCF). Drug adsorption experiments were performed under different initial DCF concentrations and different contact times. In order to investigate the influence of the chemical structure of surfactants used for modification of phillipsite on the preparation and properties of composites and DCF adsorption, experimental data were compared with previously published results on DCF adsorption by composites containing phillipsite and the same amounts of surfactants cetylpyridinium chloride (C) and Arquad®2HT-75 (A). DCF adsorption isotherms for O and D composites showed a better fit with the Langmuir model with maximum adsorption capacities between 12.3 and 38.4 mg/g and are similar to those for C and A composites, while kinetics run followed a pseudo-second-order model. Composites containing either benzyl or pyridine functional groups showed higher adsorption of DCF, implying that surfactant structure has a significant impact on drug adsorption. Drug adsorption onto O, D, C and A composites was also confirmed by FTIR–ATR spectroscopy and zeta potential measurements.
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Abstract
Nano-zeolite is an innovative class of materials that received recognition for its potential use in water and tertiary wastewater treatment. These applications include ion-exchange/sorption, photo-degradation, and membrane separation. The aim of this work is to summarize and analyze the current knowledge about the utilization of nano-zeolite in these applications, identify the gaps in this field, and highlight the challenges that face the wide scale applications of these materials. Within this context, an introduction to water quality, water and wastewater treatment, utilization of zeolite in contaminant removal from water was addressed and linked to its structure and the advances in zeolite preparation techniques were overviewed. To have insights into the trends of the scientific interest in this field, an in-depth analysis of the variation in annual research distribution over the last decade was performed for each application. This analysis covered the research that addressed the potential use of both zeolites and nano-zeolites. For each application, the characterization, experimental testing schemes, and theoretical analysis methodologies were overviewed. The results of the most advanced research were collected, summarized, and analyzed to allow an easy visualization and comparison of these research results. Finally, the gaps and challenges that face these applications are concluded.
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Smiljanić D, Daković A, Obradović M, Ožegović M, Izzo F, Germinario C, de Gennaro B. Application of Surfactant Modified Natural Zeolites for the Removal of Salicylic Acid-A Contaminant of Emerging Concern. MATERIALS 2021; 14:ma14247728. [PMID: 34947322 PMCID: PMC8708488 DOI: 10.3390/ma14247728] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Revised: 12/06/2021] [Accepted: 12/10/2021] [Indexed: 11/23/2022]
Abstract
This work aimed to test composites (surfactant modified zeolites prepared by treatment of natural zeolites—clinoptilolite (IZ CLI) and/or phillipsite (PHIL75)-rich tuffs with two different amounts of cationic surfactants: cetylpyridinium chloride (CPyCl) and Arquad® 2HT-75 (ARQ)) for the adsorption of salicylic acid (SA)—a common contaminant of emerging concern. Adsorption of SA was studied at different initial drug concentrations (in the range of 2–100 mg/L) in water solution. The Langmuir isotherm model showed the highest adsorption was achieved by bilayer composite of IZ CLI and CPyCl—around 11 mg/g. Kinetic runs were performed by using the initial drug concentration of 20 mg/L in the time interval from 0 to 75 min and pseudo-second order had good correlation with experimental data. The influence of the four different temperatures on the SA adsorption was also investigated and thermodynamic parameters suggested that the adsorption drug onto composites is an exothermic and nonspontaneous process, followed by the decrease of randomness at the solid/liquid interface during the adsorption. Zeta potential and Fourier-transform infrared spectroscopy with attenuated total reflectance (FTIR-ATR) had been performed for the characterization of composites after adsorption of SA confirming the presence of the drug at composite surfaces.
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Affiliation(s)
- Danijela Smiljanić
- Institute for Technology of Nuclear and Other Mineral Raw Materials, Franche D’ Epere 86, 11000 Belgrade, Serbia; (A.D.); (M.O.); (M.O.)
- Correspondence:
| | - Aleksandra Daković
- Institute for Technology of Nuclear and Other Mineral Raw Materials, Franche D’ Epere 86, 11000 Belgrade, Serbia; (A.D.); (M.O.); (M.O.)
| | - Milena Obradović
- Institute for Technology of Nuclear and Other Mineral Raw Materials, Franche D’ Epere 86, 11000 Belgrade, Serbia; (A.D.); (M.O.); (M.O.)
| | - Milica Ožegović
- Institute for Technology of Nuclear and Other Mineral Raw Materials, Franche D’ Epere 86, 11000 Belgrade, Serbia; (A.D.); (M.O.); (M.O.)
| | - Francesco Izzo
- Department of Earth Sciences, Environment and Resources, Federico II University, Via Cinthia, 80126 Napoli, Italy;
| | - Chiara Germinario
- Department of Science and Technology, University of Sannio, Via F. De Sanctis, 82100 Benevento, Italy;
| | - Bruno de Gennaro
- Department of Chemical, Materials and Production Engineering, Federico II University, Piazzale V. Tecchio 80, 80125 Naples, Italy;
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Smiljanić D, de Gennaro B, Daković A, Galzerano B, Germinario C, Izzo F, Rottinghaus GE, Langella A. Removal of non-steroidal anti-inflammatory drugs from water by zeolite-rich composites: The interference of inorganic anions on the ibuprofen and naproxen adsorption. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2021; 286:112168. [PMID: 33636624 DOI: 10.1016/j.jenvman.2021.112168] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2020] [Revised: 02/07/2021] [Accepted: 02/08/2021] [Indexed: 05/27/2023]
Abstract
Composites of two natural zeolites - clinoptilolite and phillipsite, and cationic surfactants (cetylpyridinium chloride and Arquad® 2HT-75) were tested for the removal of two emerging contaminants - ibuprofen and naproxen. For each zeolite-rich rock, two different modifications of the zeolitic surfaces were prepared (monolayer and bilayer surfactant coverage). The influence of the initial drug concentrations and contact time on adsorption of these drugs was followed in buffer solution. The Langmuir model showed the highest adsorption capacity for the composite characterized by a bilayered surfactant at the clinoptilolite surface: 19.7 mg/g and 16.1 mg/g for ibuprofen and naproxen, respectively. Also, to simulate real systems, drug adsorption isotherms were conducted in natural water (Grindstone creek water - Columbia, Missouri, USA) by using the best performing adsorbent; in this case, a slight decrease of drug adsorption was recorded. Kinetic runs were performed in distilled water as well as in the presence of ions such as sulfates and bicarbonates; also, in this case, the interfering agents defined an adsorption decrease for bilayer composites.
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Affiliation(s)
- Danijela Smiljanić
- Department of Science and Technology, University of Sannio, Via F. De Sanctis, 82100, Benevento, Italy.
| | - Bruno de Gennaro
- DICMAPI, Federico II University, Piazzale V. Tecchio 80, 80125, Naples, Italy
| | - Aleksandra Daković
- Institute for Technology of Nuclear and Other Mineral Raw Materials, Franche d' Epere 86, 11000, Belgrade, Serbia
| | - Barbara Galzerano
- DICMAPI, Federico II University, Piazzale V. Tecchio 80, 80125, Naples, Italy
| | - Chiara Germinario
- Department of Science and Technology, University of Sannio, Via F. De Sanctis, 82100, Benevento, Italy
| | - Francesco Izzo
- Department of Earth, Environment, and Resources Sciences, Federico II University, via Cinthia, 80126, Napoli, Italy
| | - George E Rottinghaus
- Veterinary Medical Diagnostic Laboratory, College of Veterinary Medicine, University of Missouri, Columbia, MO, 65211, USA
| | - Alessio Langella
- Department of Earth, Environment, and Resources Sciences, Federico II University, via Cinthia, 80126, Napoli, Italy
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Removal of Carbamazepine onto Modified Zeolitic Tuff in Different Water Matrices: Batch and Continuous Flow Experiments. WATER 2021. [DOI: 10.3390/w13081084] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Carbamazepine (CBZ) is the most frequently detected pharmaceutical residues in aquatic environments effluent by wastewater treatment plants. Batch and column experiments were conducted to evaluate the removal of CBZ from ultra-pure water and wastewater treatment plant (WWTP) effluent using raw zeolitic tuff (RZT) and surfactant modified zeolite (SMZ). Point zero net charge (pHpzc), X-ray diffraction (XRD), X-ray fluorescence (XRF), and Fourier Transform Infrared (FTIR) were investigated for adsorbents to evaluate the physiochemical changes resulted from the modification process using Hexadecyltrimethylammonium bromide (HDTMA-Br). XRD and FTIR showed that the surfactant modification of RZT has created an amorphous surface with new alkyl groups on the surface. The pHpzc was determined to be approximately 7.9 for RZT and SMZ. The results indicated that the CBZ uptake by SMZ is higher than RZT in all sorption tests (>8 fold). Batch results showed that the sorption capacity of RZT and SMZ in WWTP effluent (0.029 and 0.25 mg/g) is higher than RZT and SMZ (0.018 and 0.14 mg/g) in ultrapure water (1.6–1.8 fold). Batch tests showed that the equilibrium time of CBZ removal in the WWTP matrix (47 h) is much longer than CBZ removal in ultrapure water. The sorption capacity of RZT & SMZ in WWTP effluent (0.03, 0.33 mg/g) is higher than RZT and SMZ (0.02 and 0.17 mg/g) in ultrapure water (1.5–2 fold) using column test. This study has clearly demonstrated that the performance of RZT and SMZ is more efficient for the removal of CBZ from realistic wastewater than ultrapure water. It is evident that the surfactant modification of RZT has enhanced the CBZ removal in both matrices.
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Wen J, Yan C, Xing L, Wang Q, Yuan L, Hu X. Simultaneous immobilization of As and Cd in a mining site soil using HDTMA-modified zeolite. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:9935-9945. [PMID: 33159681 DOI: 10.1007/s11356-020-11477-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2020] [Accepted: 10/28/2020] [Indexed: 06/11/2023]
Abstract
Arsenic (As) and cadmium (Cd) co-contamination has been a typical problem in Chinese agricultural land adjacent to historical metal mining and smelting activities. Remediation of As and Cd in soil has encountered many difficulties owing to the distinct nature of the two metal(loid)s. In this study, we developed a remediation scheme by adding a hexadecyltrimethylammonium (HDTMA)-modified zeolite to a mining site soil and evaluated the immobilization effect. The result of the increased surface zeta potential indicates that the HDTMA modification conferred the zeolite with adsorbability towards As through the cationic surfactant head. The addition of the highest dosage of HDTMA-modified zeolite (10%) to the contaminated soil greatly improved soil organic matter by 1.4 times, partly due to the elevated C loading on the zeolite from HDTMA. Sequential extraction results show that the addition of HDTMA-modified zeolite not only increased the residual fraction of As (by 2.7-5.9%) but also reduced the toxicity-related fraction (by 2.3-2.7%) when compared to the unmodified zeolite and blank treatments. The oxidizable fractions of Cd in the modified zeolite treatment were significantly higher than that in the blank soil. Besides, the exchangeable fractions of Cd were all significantly reduced in the zeolite treatments. Enzyme activity assays show that the HDTMA-modified zeolite treatment could greatly improve soil microbial environment. The physiologically based extraction test (PBET) also proved that the bioavailability of As and Cd was reduced after the modified zeolite treatment.
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Affiliation(s)
- Jia Wen
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, People's Republic of China.
- Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, People's Republic of China.
| | - Caiya Yan
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, People's Republic of China
- Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, People's Republic of China
| | - Lang Xing
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, People's Republic of China
- Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, People's Republic of China
| | - Qian Wang
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, People's Republic of China
- Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, People's Republic of China
| | - Li Yuan
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, People's Republic of China
- Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, People's Republic of China
| | - Xiaohong Hu
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, People's Republic of China
- Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, People's Republic of China
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7
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Zeolite-Rich Composite Materials for Environmental Remediation: Arsenic Removal from Water. APPLIED SCIENCES-BASEL 2020. [DOI: 10.3390/app10196939] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Natural zeolites are used as adsorbents in purification processes due to their cation-exchange ability and molecular sieve properties. Surface modified natural zeolites (SMNZs), produced by attaching cationic organic surfactants to the external surface, can simultaneously act as ionic exchangers and organic molecule adsorbents. In this paper, SMNZs were produced and investigated as adsorbents for As(V) removal from wastewater: two natural zeolites, clinoptilolite and phillipsite, were modified using HDTMA-Br and HDTMA-Cl as surfactants. The obtained samples were then characterized under static and dynamic conditions. Results showed that As(V) removal follows a pseudo-second order kinetic, with fast adsorption rates: every sample reached 100 % removal in 2 h, while equilibrium data showed a Langmuir-like behavior, with a greater anion uptake by the HDTMA-Br modified SMNZs due to the formation of a compact and complete micellar structure. Finally, fixed-bed tests were performed to characterize the samples under dynamic conditions assessing the effect of severe operating parameters on the dynamic exchange capacity, selectivity and efficiency of the process. The obtained results demonstrate a good ability of the tested materials to adsorb As(V) from wastewater, confirming the effectiveness of the proposed surface modification technique in expanding the possibility of using natural zeolites in these processes.
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Izzo F, Mercurio M, de Gennaro B, Aprea P, Cappelletti P, Daković A, Germinario C, Grifa C, Smiljanic D, Langella A. Surface modified natural zeolites (SMNZs) as nanocomposite versatile materials for health and environment. Colloids Surf B Biointerfaces 2019; 182:110380. [DOI: 10.1016/j.colsurfb.2019.110380] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2019] [Revised: 07/15/2019] [Accepted: 07/17/2019] [Indexed: 12/20/2022]
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9
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Suazo-Hernández J, Sepúlveda P, Manquián-Cerda K, Ramírez-Tagle R, Rubio MA, Bolan N, Sarkar B, Arancibia-Miranda N. Synthesis and characterization of zeolite-based composites functionalized with nanoscale zero-valent iron for removing arsenic in the presence of selenium from water. JOURNAL OF HAZARDOUS MATERIALS 2019; 373:810-819. [PMID: 30974329 DOI: 10.1016/j.jhazmat.2019.03.125] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Revised: 03/01/2019] [Accepted: 03/30/2019] [Indexed: 06/09/2023]
Abstract
We studied the sorption of As(V) in single and multi-component (As(V)-Se(VI)) aqueous systems using nanoscale zero-valent iron (nZVI) and nZVI-functionalized zeolite (Z-nZVI) adsorbents. Morphological and physico-chemical characterization of the adsorbents was conducted using X-ray diffraction (XRD), scanning electron microscopy (SEM), surface area and electrophoretic mobility measurements. SEM and XRD analyses showed that Fe-nanoparticle size and crystallinity were better preserved in Z-nZVI than nZVI after As(V) sorption. Highly efficient As(V) removal was achieved for all tested adsorbents with a minimal competition effect of Se(VI). In the single-component system, the equilibrium As(V) sorption time on nZVI and Z-nZVI was 40 and 60 min, respectively, while in the multi-component system, this time was 90 min for both the adsorbents. The Freundlich and pseudo-second-order models provided good fittings for the experimental sorption data (r2>0.96). The As(V) removal capacity was higher using Z-nZVI than nZVI both in the single and multi-component systems, suffering minimal differences in removal in both cases. The results suggested that Z-nZVI had more specific surface sites for As(V) than nZVI and zeolite, which makes Z-nZVI a more effective adsorbent than nZVI for the removal of As(V) from aqueous solutions in the presence of other oxyanions.
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Affiliation(s)
- Jonathan Suazo-Hernández
- Programa de Doctorado en Ciencias de Recursos Naturales Universidad de La Frontera, Av. Francisco Salazar 01145, P.O. Box 54-D, Temuco, Chile; Center of Plant, Soil Interaction and Natural Resources Biotechnology, Universidad de La Frontera. UFRO. Temuco, 4780000, Chile.
| | - Pamela Sepúlveda
- Center for the Development of Nanoscience and Nanotechnology, CEDENNA, 9170124, Santiago, Chile; Facultad de Química y Biología, Universidad de Santiago de Chile, Av. B. O'Higgins, 3363, Santiago, Chile
| | - Karen Manquián-Cerda
- Facultad de Química y Biología, Universidad de Santiago de Chile, Av. B. O'Higgins, 3363, Santiago, Chile
| | - Rodrigo Ramírez-Tagle
- Facultad de Ingeniería, Ciencia y Tecnología, Universidad Bernardo O'Higgins, Viel 1497, Santiago, Chile
| | - María Angélica Rubio
- Center for the Development of Nanoscience and Nanotechnology, CEDENNA, 9170124, Santiago, Chile; Facultad de Química y Biología, Universidad de Santiago de Chile, Av. B. O'Higgins, 3363, Santiago, Chile
| | - Nanthi Bolan
- Global Centre for Environmental Remediation, University of Newcastle, Callaghan, NSW 2308, Australia
| | - Binoy Sarkar
- Department of Animal and Plant Sciences, The University of Sheffield, Western Bank, Sheffield S10 2 TN, UK.
| | - Nicolás Arancibia-Miranda
- Center for the Development of Nanoscience and Nanotechnology, CEDENNA, 9170124, Santiago, Chile; Facultad de Química y Biología, Universidad de Santiago de Chile, Av. B. O'Higgins, 3363, Santiago, Chile
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Mahdavi M, Nezamzadeh-Ejhieh A. An aluminum selective electrode via modification of PVC membrane by modified clinoptilolite nanoparticles with hexadecyltrimethyl ammonium bromide (HDTMA-Br) surfactant containing Arsenazo III. J Colloid Interface Sci 2017; 494:317-324. [PMID: 28161503 DOI: 10.1016/j.jcis.2017.01.102] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2016] [Revised: 12/24/2016] [Accepted: 01/25/2017] [Indexed: 10/20/2022]
Abstract
A modified PVC (polyvinyl chloride) membrane with clinoptilolite nanoparticles/hexadecyltrimethyl ammonium bromide surfactant (HDTMABr)/Arsenazo III: (NSMZ-ARS), was used for construction of Al(III) -selective electrode. The raw and modified samples were characterized by XRD, FTIR, SEM and TEM methods. Among the different tested membranes constructed by raw and modified samples, only, the membrane electrode containing NSMZ-ARS showed a suitable Nernstian response to aluminum in the concentration range of 2.04×10-5 to 1.99×10-1M (r=0.9987), with a detection limit of 1.0×10-5molL-1 and a Nernstian slope of 19.6±0.5mV per decade of aluminum concentration. The electrode response to aluminum remained constant in the pH range of 2-4. The sensor was selective for aluminum over a wide variety of other ions and exhibited. The electrode had a rapid response time and its response reached to steady potential at 5s. The electrode had also satisfactory long term stability and held its activity at least 3months.
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Affiliation(s)
- Mostafa Mahdavi
- Department of Chemistry, Shahreza Branch, Islamic Azad University, P.O. Box 311-86145, Shahreza, Isfahan, Iran; Young Researchers and Elite Club, Shahreza Branch, Islamic Azad University, Shahreza, Iran
| | - Alireza Nezamzadeh-Ejhieh
- Department of Chemistry, Shahreza Branch, Islamic Azad University, P.O. Box 311-86145, Shahreza, Isfahan, Iran; Young Researchers and Elite Club, Shahreza Branch, Islamic Azad University, Shahreza, Iran; Razi Chemistry Research Center (RCRC), Shahreza Branch, Islamic Azad University, Isfahan, Iran.
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Pasquino R, Di Domenico M, Izzo F, Gaudino D, Vanzanella V, Grizzuti N, de Gennaro B. Rheology-sensitive response of zeolite-supported anti-inflammatory drug systems. Colloids Surf B Biointerfaces 2016; 146:938-44. [DOI: 10.1016/j.colsurfb.2016.07.039] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2016] [Revised: 07/09/2016] [Accepted: 07/19/2016] [Indexed: 11/29/2022]
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12
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Surfactant modification and adsorption properties of clinoptilolite for the removal of pertechnetate from aqueous solutions. J Radioanal Nucl Chem 2016. [DOI: 10.1007/s10967-016-4850-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Talebi M, Vaezifar S, Jafary F, Fazilati M, Motamedi S. Stability Improvement of Immobilized α-amylase using Nano Pore Zeolite. IRANIAN JOURNAL OF BIOTECHNOLOGY 2016; 14:33-38. [PMID: 28959315 DOI: 10.15171/ijb.1261] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
BACKGROUND Enzyme engineering by immobilization techniques has proven to be well compatible with the other chemical or biological approaches aiming to improve enzyme's functions and stability. Zeolites are porous alumino-silicates with a wide range of porosity and particle size along with the other remarkable properties such as high surface area, high stability against a wide range temperatures, pHs, as well as organic solvents. OBJECTIVES Nano-zeolites are a class of advanced materials that have special properties that has made them ideal candidate for a wide range of applications. MATERIALS AND METHODS In this study, a nano-zeolite which has been synthesized and characterized in our previous work, was used to immobilize α-amylase and activated with glutaraldehyde as a bi-functional agent to improve enzyme properties. RESULTS Studies have shown an increased stability of the immobilized enzyme compared to the free enzyme against a range of temperature change and pHs as well. Also the stability of the immobilized enzyme was increased with respect to storage. The calculated binding efficiency shows that the immobilized α-amylase conserved 58.44 % of its native activity. CONCLUSIONS Using nano pore zeolite for covalent attachment of the α-amylase resulted in an increased resistance of this enzyme against denaturation. The immobilized enzyme demonstrated higher stability compared to the free enzyme at higher temperatures and pH variations. Immobilization also caused an increase in the enzyme stability during storage.
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Affiliation(s)
- Maedeh Talebi
- Department of Biology, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Sedigheh Vaezifar
- Department of Medical Engineering, Payame Noor University, Tehran, Iran
| | - Fariba Jafary
- Young Researchers and Elite Club, Falavarjan Branch, Islamic Azad University, Isfahan, Iran
| | - Mohamad Fazilati
- Department of Biochemistry, Payame Noor University, Isfahan, Iran
| | - Shima Motamedi
- School of Veterinary Medicine, Razi University, Kermanshah, Iran
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15
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Olguín MT, Deng S. Ce-Fe-modified zeolite-rich tuff to remove Ba(2+)-like (226)Ra(2+) in presence of As(V) and F(-) from aqueous media as pollutants of drinking water. JOURNAL OF HAZARDOUS MATERIALS 2016; 302:341-350. [PMID: 26476322 DOI: 10.1016/j.jhazmat.2015.09.070] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2015] [Revised: 09/18/2015] [Accepted: 09/30/2015] [Indexed: 06/05/2023]
Abstract
The sorption behavior of the Ba(2+)-like (226)Ra(2+) in the presence of H2AsO4(-)/HAsO4(2-) and F(-) from aqueous media using Ce-Fe-modified zeolite-rich tuff was investigated in this work. The Na-modified zeolite-rich tuff was also considered for comparison purposes. The zeolite-rich tuff collected from Wyoming (US) was in contact with NaCl and CeCl3-FeCl3 solutions to obtain the Na- and Ce-Fe-modified zeolite-rich tuffs (ZUSNa and ZUSCeFe). These zeolites were characterized by scanning electron microscopy and X-ray diffraction. The BET-specific surface and the points of zero charge were determined as well as the content of Na, Ce and Fe by neutron activation analysis. The textural characteristics and the point of zero charge were changed by the presence of Ce and Fe species in the zeolitic network. A linear model described the Ba(2+)-like (226)Ra(2+) sorption isotherms and the distribution coefficients (Kd) varied with respect to the metallic species present in the zeolitic material. The As(V) oxianionic chemical species and F(-) affected this parameter when the Ba(2+)-like (226)Ra(2+)-As(V)-F(-) solutions were in contact with ZUSCeFe. The H2AsO4(-)/HAsO4(2-) and F(-) were adsorbed by ZUSCeFe in the same amount, independent of the concentration of Ba(2+)-like (226)Ra(2+) in the initial solution.
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Affiliation(s)
- María Teresa Olguín
- Department of Chemical & Materials Engineering, New Mexico State University, P.O. Box 30001, MSC 3805, Las Cruces, NM 88003, USA; Departamento de Química, Instituto Nacional de Investigaciones Nucleares, A.P. 18-1027, Col. Escandón, Delegación Miguel Hidalgo, C.P. 11801, México D.F., Mexico.
| | - Shuguang Deng
- Department of Chemical & Materials Engineering, New Mexico State University, P.O. Box 30001, MSC 3805, Las Cruces, NM 88003, USA
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Song W, Shi T, Yang D, Ye J, Zhou Y, Feng Y. Pretreatment effects on the sorption of Cr(VI) onto surfactant-modified zeolite: Mechanism analysis. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2015; 162:96-101. [PMID: 26232569 DOI: 10.1016/j.jenvman.2015.07.010] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2014] [Revised: 06/12/2015] [Accepted: 07/03/2015] [Indexed: 06/04/2023]
Abstract
Adsorption of Cr(VI) onto different pretreated zeolites modified with cetylpyridinium chloride (CPC) is investigated using batch studies, Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) measurements and scanning electron microscopy (SEM). The results indicate that acidification after alkalization is the most effective pretreatment method, and only alkalization would significantly reduce the sorption capability. This behavior is due to the precipitates, such as CaCO3 and MgCO3, generated after alkalization on zeolite surface interfere the formation of the CPC bilayer, which provides active sites for sorbing Cr(VI). The schematic of the adsorption mechanism is presented. The results indicate that developing a better understanding of the influence of different pretreatments is quite helpful and suggest that the content of Ca/Mg/Fe could be a good indication of the effectiveness of preprocessing.
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Affiliation(s)
- Wenzhe Song
- School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, PR China
| | - Taihong Shi
- School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, PR China.
| | - Di Yang
- School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, PR China
| | - Jinpeng Ye
- School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, PR China
| | - Yi Zhou
- School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, PR China
| | - Yuxiang Feng
- School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, PR China
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de Gennaro B, Catalanotti L, Cappelletti P, Langella A, Mercurio M, Serri C, Biondi M, Mayol L. Surface modified natural zeolite as a carrier for sustained diclofenac release: A preliminary feasibility study. Colloids Surf B Biointerfaces 2015; 130:101-9. [DOI: 10.1016/j.colsurfb.2015.03.052] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2014] [Revised: 03/21/2015] [Accepted: 03/24/2015] [Indexed: 10/23/2022]
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