钒酸铋催化氧化米糊中的三价砷

Photooxidation of arsenate(III) with Bi VO_4 in rice suspensions

摘要: 为研究单斜相钒酸铋(Bi VO4)对米糊中三价砷(As(III))的氧化作用。首先通过水热法合成了Bi VO4,并以X射线衍射仪(XRD)确定其晶态,场发射扫描显微镜(FESEM)测定其形态,再将制备的单斜相Bi VO4光催化氧化米糊中的As(III)。结果表明,经过光催化反应,米糊中99.8%的As(III)能被除去,其中,86%的As(III)被氧化生成As(V),经推测,其余As(III)可能被Bi VO4吸附。往米糊中加入100ppb的As(III),再以单斜相的Bi VO4光催化氧化米糊,米糊中As(III)的最大光氧化效率为86%,最大光氧化率的参数条件是:Bi VO4反应液p H为2,使用量为2.6mmol/L,米糊浓度为1%,p H为11。

Abstract: The photooxidation of monoclinic Bi VO4 on trivalent arsenic( As( III)) in rice suspensions was studied.Bi VO4 was synthesized through hydrothermal method,and its crystalline phases was analyzed by X- ray diffraction( XRD) and its morphologies was examined by field emission scanning electron microscope( FESEM). Then the synthesized monoclinic Bi VO4 were used to photooxidize As( III) in rice suspensions.The results indicated that the removal ration of As( III) was up to 99.8% : 86% of them were oxidized to pentavalent arsenic( As( V)),and the rest were absorbed by Bi VO4.Photooxidation parameters were optimized : Bi VO4 of 2.6mmol / L synthesized at p H2 was effective to photooxidize 1% rice suspensions contain 100 ppb As( III) in alkaline solution.