杂多酸改性生物材料催化氧化处理染料废水
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摘要
采用磷钨杂多酸处理贝壳粉,制备了负载型光催化复合材料,经X射线衍射(XRD)分析表明,其主要成分是CaWO_4/Ca_3(PO_3)_2/CaCO_3。扫描电镜分析显示,贝壳粉经煅烧形成了0.5～2μm的CaCO_3颗粒,CaWO_4和Ca_3(PO_3)_2以分散的形式负载于CaCO_3颗粒表面。这类催化剂对染料废水具有良好的可见光催化氧化活性。当pH=5时在太阳光照射下该催化剂降解刚果红反应80 min,刚果红的降解率可以达到90%以上。动力学研究表明该催化过程符合拟一级动力学模型。
The photocatalytic composites were prepared by treating shell powder with phosphotungstic heteropolyacid, and characterized by XRD to obtain the main elements CaWO_4/Ca_3(PO_3)_2/CaCO_3. SEM showed CaCO_3 particles were 0.5～2 μm formed from calcination of shell powder; and CaWO_4 and Ca_3(PO_3)_2 loaded on the surface of CaCO_3 particles in a dispersed form.This catalyst had good visible light catalytic oxidation activity to dye wastewater. The experimental results showed that the degradation rate of Congo red of spw-a1 samples reached over 90% after the reaction for 80 min at pH=5 and under the irradiation of sunlight. Kinetic studies showed that the catalytic process conformed to the quasi-first-order kinetic model.
The photocatalytic composites were prepared by treating shell powder with phosphotungstic heteropolyacid, and characterized by XRD to obtain the main elements CaWO_4/Ca_3(PO_3)_2/CaCO_3. SEM showed CaCO_3 particles were 0.5～2 μm formed from calcination of shell powder; and CaWO_4 and Ca_3(PO_3)_2 loaded on the surface of CaCO_3 particles in a dispersed form.This catalyst had good visible light catalytic oxidation activity to dye wastewater. The experimental results showed that the degradation rate of Congo red of spw-a1 samples reached over 90% after the reaction for 80 min at pH=5 and under the irradiation of sunlight. Kinetic studies showed that the catalytic process conformed to the quasi-first-order kinetic model.
引文
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[3]任南琪,周显娇,郭婉茜,等.染料废水处理技术研究进展[J].化工学报,2013,64(1):84-94.
[4]李田.光化学氧化法的类型及研究进程[J].环境污染与防治,1993(1):32-34.
[5]赵进才,赵伟,马万红.具有可见光相应的光催化剂及其制备方法和应用[J].科学观察,2005(5):45-45.
[6]李富民.磷钨酸盐可见光催化降解染料的性能研究[D].上海:东华大学,2011.
[7]温郎友,沈师孔.二氧化硅负载磷钨杂多酸催化剂的表征及催化性质[J].催化学报,2000,21(6):529-532.
[8]王少鹏,薛建伟,刘春丽.分子筛负载杂多酸催化剂的研究[J].山西化工,2006,26(6):26-29.
[9]陈佳明,庞博,盖宏辉.杂多酸催化剂应用性研究进展[J].广州化工,2011,39(6):7-8.
[10]李红.生物材料为载体的纳米广谱光催化剂的制备与性能研究[D].青岛:中国科学院海洋研究所,2012.