TiO_2-Ag_3PO_4光催化剂的制备及其紫外光催化性能 |
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引用本文: | 李大军,贺惠,杨丽. TiO_2-Ag_3PO_4光催化剂的制备及其紫外光催化性能[J]. 化工环保, 2016, 0(1): 53-58. DOI: 10.3969/j.issn.1006-1878.2016.01.011 |
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作者姓名: | 李大军 贺惠 杨丽 |
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作者单位: | 湖南工学院 安全与环境工程学院,湖南 衡阳,421002 |
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基金项目: | 湖南省教育厅科学研究项目,湖南工学院校级科研项目 |
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摘 要: | 采用化学沉淀法(两步法)制备了TiO_2-Ag_3PO_4复合光催化剂,考察了该光催化剂紫外光催化降解阳离子染料番红花红T(简称ST)的性能。实验结果表明:在TiO_2-Ag_3PO_4投加量0.7 g/L,初始ST质量浓度70 mg/L、不调节溶液pH的条件下,紫外光照射35 min时的ST降解率高达97.9%;TiO_2-Ag_3PO_4复合光催化剂的光催化性能明显优于单一光催化剂Ag_3PO_4和TiO_2,同时也明显优于Ag-AgCl/Ag_3PO_4复合光催化剂;避光条件下反应40 min,TiO_2-Ag_3PO_4对ST的吸附量仅为2.3 mg/g;TiO_2-Ag_3PO_4在室内自然光下也具有一定的光催化活性;TiO_2-Ag_3PO_4的光催化活性在酸性条件下要优于碱性条件;TiO_2-Ag_3PO_4重复使用5次后,其光催化活性无明显下降,稳定性较好。
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关 键 词: | 化学沉淀法 光催化剂 染料废水 番红花红T 紫外光 光催化性能 |
Preparation of TiO2-Ag3PO4 photocatalyst and its photocatalytic activity under UV irradiation |
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Abstract: | The TiO2-Ag3PO4 composite photocatalyst was prepared by chemical precipitation method(two-step method), and its photocatalytic activity under UV light to degradation of safranine T(ST)cationic dye was explored. The experimental results show that:Under the conditions of TiO2-Ag3PO4 dosage 0.7 g/L,initial ST mass concentration 70 mg/L,without pH adjustment and UV irradiation time 35 min,the degradation rate of ST is up to 97.9%;The photocatalytic activity of TiO2-Ag3PO4 is obviously higher than that of single photocatalyst Ag3PO4 and TiO2,and also Ag-AgCl/Ag3PO4 composite photocatalyst;The adsorption capacity of ST is only 2.3 mg/g after dark reaction for 40 min;TiO2-Ag3PO4 also has photocatalytic activity under indoor natural light;The photocatalytic activity of TiO2-Ag3PO4 in acidic condition is better than that in alkaline condition;TiO2-Ag3PO4 is stable with same photocatalytic activity after 5 times of reuse. |
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Keywords: | chemical precipitation method photocatalyst dye wastewater safranine T ultraviolet light photocatalytic activity |
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