化工新型材料

化工新型材料 ›› 2018, Vol. 46 ›› Issue (9) : 209-212.

科学研究

BiOI/Fe₃O₄光催化耦合过一硫酸氢盐降解酸性橙Ⅱ研究

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Activited peroxymonosulfate (PMS) degradation of acid orange Ⅱ by visible light-driven photocatalytic material BiOI/Fe₃O₄

Wang Jingquan, Zhang Yongli, Zhai Guanxing, Tang Peng

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Received
2017-04-24
Issue Date	Revised Date
2018-11-05	2017-04-24

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摘要

采用水热/共沉淀法合成新型磁性纳米可见光光催化材料BiOI/Fe₃O₄,通过X射线衍射仪和扫描电镜对材料进行表征分析。采用氙灯模拟太阳光照射,构建可见光照射下BiOI/Fe₃O₄催化剂耦合过一硫酸氢盐(PMS)催化氧化水环境中残留的水溶性偶氮染料酸性橙Ⅱ的体系。考察了催化剂投加量、PMS浓度等因素对酸性橙Ⅱ降解效果的影响,并通过自由基淬灭实验初步探讨了催化作用机理。结果表明:磁性纳米颗粒Fe₃O₄均匀地负载在花球状的BiOI上;在催化剂投加量为0.5g/L、PMS浓度为0.25mmol/L的优化条件下,浓度为20mg/L的酸性橙Ⅱ在1h内降解率可达到99.2%,并符合拟一级动力学模型;材料循环使用3次后,酸性橙Ⅱ降解率仍可达到98%以上;实验证明体系中主要的活性物种为羟基自由基(·OH)和硫酸根自由基(·SO^-₄)。

Abstract

The magnetic nanocomposite photocatalyst BiOI/Fe₃O₄ was synthesized by a hydrothermal-precipitation method,and characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM).Photocatalytic oxidation system was constructed to degrade water-soluble azo dye acid orange Ⅱ residual in the water by using a xenon lamp.Furthermore,the effects of pH,photocatalyst dosage,peroxymonosulfate concentration and other factors on degradation of acid orange Ⅱ and photo-mechanism of catalysis reaction were investigated by the test of scavenging free radical activity.The results showed that the magnetic nanoparticles Fe₃O₄ spheres were firmly immobilized on BiOI homogeneously and the degradation rate of 20mg/L mass concentration of acid orange Ⅱ in 60 min was 99.2% under the optimized conditions of BiOI/Fe₃O₄ catalyst dosage 0.5g/L,PMS concentration 0.25mmol/L.After 3 times recycling,the reaction rate of acid orange Ⅱ was still more than 98%,and the main active species were hydroxyl radical (·OH) and sulfate radical (·SO^-₄) in reaction system.

关键词

碘氧化铋 / 四氧化三铁 / 过一硫酸氢盐 / 可见光 / 催化降解 / 酸性橙Ⅱ

Key words

bismuth oxyiodide / magnetic oxide / peroxymonosulfate / visible light / catalytic degradation / acid orange Ⅱ

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BiOI/Fe₃O₄光催化耦合过一硫酸氢盐降解酸性橙Ⅱ研究[J]. 化工新型材料, 2018, 46(9): 209-212 DOI:

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