ADSORPTION OF As(Ⅲ) ON La<sub>2</sub>O<sub>3</sub> NANOPARTICLES IN AQUEOUS SOLUTION

YE Qian-ling; JIN Xin; CHEN Xiao; SHI Lin; YANG Qi; LIU Zhao-xiang; WANG Jing; ZHANG Xiao-lan; WANG Shu-tang

doi:10.13205/j.hjgc.202001016

Volume 38 Issue 1

Mar. 2020

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2020 > 38(1): 105-111,134

YE Qian-ling, JIN Xin, CHEN Xiao, SHI Lin, YANG Qi, LIU Zhao-xiang, WANG Jing, ZHANG Xiao-lan, WANG Shu-tang. ADSORPTION OF As(Ⅲ) ON La2O3 NANOPARTICLES IN AQUEOUS SOLUTION[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(1): 105-111,134. doi: 10.13205/j.hjgc.202001016

Citation:

YE Qian-ling, JIN Xin, CHEN Xiao, SHI Lin, YANG Qi, LIU Zhao-xiang, WANG Jing, ZHANG Xiao-lan, WANG Shu-tang. ADSORPTION OF As(Ⅲ) ON La₂O₃ NANOPARTICLES IN AQUEOUS SOLUTION[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(1): 105-111,134. doi: 10.13205/j.hjgc.202001016

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ADSORPTION OF As(Ⅲ) ON La₂O₃ NANOPARTICLES IN AQUEOUS SOLUTION

doi: 10.13205/j.hjgc.202001016

1. Beijing Key Laboratory of Water Resources&Environmental Engineering Laboratory of Groundwater Circulation and Evolution, School of Water Resources and Environment, China University of Geosciences(Beijing), Beijing 100083, China;
2. Foreign Economic Cooperation Office, Ministry of Ecology and Environment, Beijing 100035, China

Received Date: 2018-12-18

Abstract

Abstract

La₂O₃ nanoparticles, using cetrimonium bromide(CTMAB) as the surfactant, were prepared by co-precipitation method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and N₂ adsorption-desorption isotherms(BET). A series of batch experiments were carried out to study the effects of solution pH, coexisting anions and ionic strength on the adsorption of As(Ⅲ) by La₂O₃ nanoparticles. Adsorption kinetics and adsorption isotherm models were used to simulate the adsorption process and explore the adsorption mechanism. The results showed that La₂O₃ prepared with 0.2% CTMAB had a higher adsorption capacity on As(Ⅲ). The optimum pH range of As(Ⅲ) adsorption was 5~9. The effect of SO^2-₄ and CO^2-₃ on the adsorption of As(Ⅲ) was insignificant, while the efficiencies of As(Ⅲ) adsorption were separately decreased to 39.14% and 25.36%, when the concentrations of SiO^2-₃ and PO₄^3- were increased to 10 mmol/L. The negligible influence of ionic strength on the adsorption indicated that the adsorption was an inner layer adsorption; the adsorption of As(Ⅲ) by La₂O₃ nanoparticles fitted with the pseudo-secondary reaction kinetics and the Langmuir adsorption isotherm model, demonstrating that the adsorption was a monolayer adsorption. The theoretical maximum adsorption capacity of La₂O₃ nanoparticles was 45.5 mg/g. The mechanism for As(Ⅲ) adsorption was as follows: the hydroxyl group La—OH formed by hydroxylation of La₂O₃ reacted with As(Ⅲ) and generated a monodentate or bidentate complex, which removed As(Ⅲ) from aqueous solution.
- La₂O₃ nanoparticles,
- adsorption,
- arsenic,
- mechanism,
- kinetics

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