Yang Jun, Xu Ren-Kou
State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.
Huan Jing Ke Xue. 2008 Nov;29(11):3219-24.
Toxicity and mobility of As(III) in environments is greater than As(V). The transformation of As(III) to As(V) is in favor of the adsorption and fixation of arsenic on adsorbents. TiO2 photocatalyzed As(III) oxidation in the suspension systems of variable charge soils and the adsorption of oxidation products by the soils were investigated with a batch method. The photocatalysis experiments were conducted in a reaction box made by authors. The experiment results show that the photocatalyzed As(III) oxidation increased with the increase in the amount of TiO2 added and the time of irradiation, and 1.0 g x L(-1) of TiO2 and 90 min of irradiation were enough for photocatalyzed As(III) oxidation in the soil suspension systems. The TiO2 photocatalyzed As(III) oxidation in the variable charge soils and the adsorption of oxidation products by the soils increased the removal of arsenic from water and the similar processes were observed in TiO2O-Fe/Al oxides' systems. The results also indicated that gamma-Al2O3 was able to induce the photocatalyzed oxidation of As(III) in suspension systems.
环境中三价砷（As(III)）的毒性和迁移性大于五价砷（As(V)）。As(III)向As(V)的转化有利于砷在吸附剂上的吸附和固定。采用批量法研究了可变电荷土壤悬浮体系中TiO₂光催化As(III)氧化及土壤对氧化产物的吸附。光催化实验在作者自制的反应箱中进行。实验结果表明，光催化As(III)氧化随着TiO₂添加量和光照时间的增加而增加，1.0 g·L⁻¹的TiO₂和90分钟的光照足以使土壤悬浮体系中的As(III)发生光催化氧化。可变电荷土壤中TiO₂光催化As(III)氧化及土壤对氧化产物的吸附增加了水中砷的去除，在TiO₂/铁铝氧化物体系中也观察到了类似过程。结果还表明，γ-Al₂O₃能够在悬浮体系中诱导As(III)的光催化氧化。
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