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Enhanced removal of chromium(III) for aqueous solution by EDTA modified attapulgite: Adsorption performance and mechanism.
Sci Total Environ. 2020 Jun 10; 720:137391.ST

Abstract

Ethylenediaminetetraacetic acid modified attapulgite (EDTA-ATP) was developed as a novel and promising adsorbent for removal of aqueous Cr(Ш). The structure and surface properties of EDTA-ATP were characterized and the results indicated that EDTA moieties have been successfully anchored on the surface of ATP. Adsorption of Cr(III) on EDTA-ATP and aminopropyl-modified attapulgite (APTES-ATP) monotonously reduced with decreasing pH, and Cr(III) adsorption on EDTA-ATP is substantially higher than APTES-ATP in tested pH range, especially at lower pH. Presence of citric acid and gelatin had no obvious influence on Cr(III) adsorption to EDTA-ATP, but significantly reduced Cr(III) adsorption on APTES-ATP. Coexisting cations resulted in decreased Cr(III) adsorption on EDTA-ATP by competition with Cr(III) for surface-bound EDTA groups of the adsorbent. Adsorption isotherm of Cr(III) on EDTA-ATP followed the Langmuir model and the maximum adsorption capacity of the adsorbent for Cr(III) was 131.37 mg/g at 25 °C and pH 3.0. Cr(Ш) loaded adsorbent could be regenerated easily in HCl solution and the regenerated adsorbent still exhibited high adsorption capacity for Cr(III). XPS analysis confirmed that the enhanced Cr(III) adsorption on EDTA-ATP was ascribed to form the stable complexes between Cr(III) and surface-bound carboxyl and amino groups of the adsorbents.

Authors+Show Affiliations

College of Environmental Science and Engineering, Shaanxi University of Science & Technology, Xi'an 710021, China; Shaanxi Key Laboratory of Green Preparation and Functionalization of Inorganic Materials, Xi'an 710021, China. Electronic address: wangjiahong@sust.edu.cn.College of Environmental Science and Engineering, Shaanxi University of Science & Technology, Xi'an 710021, China; Shaanxi Key Laboratory of Green Preparation and Functionalization of Inorganic Materials, Xi'an 710021, China.College of Environmental Science and Engineering, Shaanxi University of Science & Technology, Xi'an 710021, China; Shaanxi Key Laboratory of Green Preparation and Functionalization of Inorganic Materials, Xi'an 710021, China.College of Environmental Science and Engineering, Shaanxi University of Science & Technology, Xi'an 710021, China; Shaanxi Key Laboratory of Green Preparation and Functionalization of Inorganic Materials, Xi'an 710021, China. Electronic address: wangchuanyi@sust.edu.cn.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

32143033

Citation

Wang, Jiahong, et al. "Enhanced Removal of chromium(III) for Aqueous Solution By EDTA Modified Attapulgite: Adsorption Performance and Mechanism." The Science of the Total Environment, vol. 720, 2020, p. 137391.
Wang J, Zhang D, Liu S, et al. Enhanced removal of chromium(III) for aqueous solution by EDTA modified attapulgite: Adsorption performance and mechanism. Sci Total Environ. 2020;720:137391.
Wang, J., Zhang, D., Liu, S., & Wang, C. (2020). Enhanced removal of chromium(III) for aqueous solution by EDTA modified attapulgite: Adsorption performance and mechanism. The Science of the Total Environment, 720, 137391. https://doi.org/10.1016/j.scitotenv.2020.137391
Wang J, et al. Enhanced Removal of chromium(III) for Aqueous Solution By EDTA Modified Attapulgite: Adsorption Performance and Mechanism. Sci Total Environ. 2020 Jun 10;720:137391. PubMed PMID: 32143033.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Enhanced removal of chromium(III) for aqueous solution by EDTA modified attapulgite: Adsorption performance and mechanism. AU - Wang,Jiahong, AU - Zhang,Dan, AU - Liu,Shaochong, AU - Wang,Chuanyi, Y1 - 2020/02/19/ PY - 2019/10/19/received PY - 2020/02/13/revised PY - 2020/02/16/accepted PY - 2020/3/7/pubmed PY - 2020/3/7/medline PY - 2020/3/7/entrez KW - Adsorption KW - Chromium(III) KW - EDTA modified attapulgite KW - Mechanism SP - 137391 EP - 137391 JF - The Science of the total environment JO - Sci. Total Environ. VL - 720 N2 - Ethylenediaminetetraacetic acid modified attapulgite (EDTA-ATP) was developed as a novel and promising adsorbent for removal of aqueous Cr(Ш). The structure and surface properties of EDTA-ATP were characterized and the results indicated that EDTA moieties have been successfully anchored on the surface of ATP. Adsorption of Cr(III) on EDTA-ATP and aminopropyl-modified attapulgite (APTES-ATP) monotonously reduced with decreasing pH, and Cr(III) adsorption on EDTA-ATP is substantially higher than APTES-ATP in tested pH range, especially at lower pH. Presence of citric acid and gelatin had no obvious influence on Cr(III) adsorption to EDTA-ATP, but significantly reduced Cr(III) adsorption on APTES-ATP. Coexisting cations resulted in decreased Cr(III) adsorption on EDTA-ATP by competition with Cr(III) for surface-bound EDTA groups of the adsorbent. Adsorption isotherm of Cr(III) on EDTA-ATP followed the Langmuir model and the maximum adsorption capacity of the adsorbent for Cr(III) was 131.37 mg/g at 25 °C and pH 3.0. Cr(Ш) loaded adsorbent could be regenerated easily in HCl solution and the regenerated adsorbent still exhibited high adsorption capacity for Cr(III). XPS analysis confirmed that the enhanced Cr(III) adsorption on EDTA-ATP was ascribed to form the stable complexes between Cr(III) and surface-bound carboxyl and amino groups of the adsorbents. SN - 1879-1026 UR - https://www.unboundmedicine.com/medline/citation/32143033/Enhanced_removal_of_chromium(III)_for_aqueous_solution_by_EDTA_modified_attapulgite:_Adsorption_performance_and_mechanism L2 - https://linkinghub.elsevier.com/retrieve/pii/S0048-9697(20)30901-3 DB - PRIME DP - Unbound Medicine ER -
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