ADSORPTION PERFORMANCE AND MECHANISM OF NATURAL PYRRHOTITE FOR As (Ⅲ) IN WATER

GUAN Meng-sha; LUO Li-yu; SHEN Si-wen; ZHOU Li-song; QIU Jiang-kun; LI Rui-hua

doi:10.13205/j.hjgc.202102006

Volume 39 Issue 2

Jul. 2021

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GUAN Meng-sha, LUO Li-yu, SHEN Si-wen, ZHOU Li-song, QIU Jiang-kun, LI Rui-hua. ADSORPTION PERFORMANCE AND MECHANISM OF NATURAL PYRRHOTITE FOR As (Ⅲ) IN WATER[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(2): 33-40. doi: 10.13205/j.hjgc.202102006

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GUAN Meng-sha, LUO Li-yu, SHEN Si-wen, ZHOU Li-song, QIU Jiang-kun, LI Rui-hua. ADSORPTION PERFORMANCE AND MECHANISM OF NATURAL PYRRHOTITE FOR As (Ⅲ) IN WATER[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(2): 33-40. doi: 10.13205/j.hjgc.202102006

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ADSORPTION PERFORMANCE AND MECHANISM OF NATURAL PYRRHOTITE FOR As (Ⅲ) IN WATER

doi: 10.13205/j.hjgc.202102006

School of the Environment, Nanjing University, Nanjing 210046, China

Received Date: 2020-04-11
Available Online: 2021-07-19

Abstract

Abstract

As one of the most common pollutants in groundwater, excessive arsenic intake will seriously threaten human health. The kinetics, isotherm and thermodynamics in the adsorption process were analyzed, and the effects of pH and inorganic anions on the adsorption of As(Ⅲ) in water by natural pyrrhotite were studied. It was found that adsorption of As(Ⅲ) by pyrrhotite reached equilibrium in 48 h. Adsorption processes followed the Langmuir isothermal model, in the range of 1~200 mg/L for initial concentration, and the saturated adsorption capacity of As(Ⅲ) on natural pyrrhotite from 23℃ to 33℃ was 3.5~4.5 mg/g (by As element). The adsorption capacity increased with the increase of temperature, and the adsorption process was a spontaneous endothermic reaction. And the best effect occurred when pH was 7,where the removal rate of As(Ⅲ) was (95.51±0.30)%. PO₄^3- had obvious inhibition on the adsorption. X-ray photoelectron spectroscopy analysis showed that the adsorption involved physical adsorption and chemical adsorption, including site attraction caused by the defect structure of minerals, As and S coordination ion exchange, and the coordination precipitation of iron hydroxide oxide. The results showed that the adsorption of As(Ⅲ) by pyrrhotite simplified the tedious steps of the oxidation of As(Ⅲ) to As(Ⅴ) by materials and methods, and had good prospect of utilization.
- adsorption,
- pyrrhotite,
- arsenite As(Ⅲ),
- X-ray photo electron spectroscopy

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References(43)

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