Adsorption removal of roxarsone, arsenite(Ⅲ),and arsenate(Ⅴ) using iron-modified sorghum straw biochar and its kinetics

作者：Shuyan Zang; Yingying Zuo; Juan Wang^*; Xiuming Liu^*; Mario Alberto Gomez; Lan Wei

来源：Acta Geochimica, 2021, 40(03): 409-418.

Arsenic(As) contamination in groundwater is a major problem in many countries, which causes serious health issues. In this paper, a novel method has been developed for the simultaneous removal of ROX and As(Ⅲ/Ⅴ) using the modified sorghum straw biochar(MSSB). The MSSB was characterized by X-ray diffraction, scanning electron microscopy, Fourier Transform Infrared, and Brunauer–Emmet–Teller(BET) surface area.The removal performance of MSSB for ROX, arsenite[As(Ⅲ)], and arsenate(As(Ⅴ)) was investigated using batch experiments. At pH of 5, the arsenic concentration of 1.0 mg/L, adsorbent dose of 1.0 g/L, the maximum adsorptioncapacities of ROX,As(Ⅲ),and As(Ⅴ) were 12.4, 5.3, and 23.0 mg/g, respectively. The adsorption behaviors were fit well with the Langmuir and the pseudo-second-order rate model. The results showed that MSSB acted as a highly effective adsorbent to simultaneously remove the composite pollution system consisted of ROX and As(Ⅲ/Ⅴ) in aqueous solutions,providing a promising method in environmental restoration applications.

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  环境地球化学国家重点实验室