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Volume 38 Issue 1
Mar.  2020
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Article Contents
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

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

doi: 10.13205/j.hjgc.202001016
  • Received Date: 2018-12-18
  • 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 SO2-4 and CO2-3 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 SiO2-3 and PO43- 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.
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