Preparation of N-TiO2 photocatalyst and its degradation of organic pollutants under blue LED light
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摘要: 分别采用机械化学法、水解沉淀法和溶胶−凝胶法合成了氮掺杂二氧化钛（N-TiO2)催化剂，以亚甲基蓝（Methylene Blue, MB）和盐酸四环素（Tetracycline hydrochloride, TTC）为目标污染物. 光催化实验及催化剂的形貌表征对比表明，水解沉淀法合成的N-TiO2-H具有较高蓝光催化活性且颗粒分布均匀，无团聚现象. 选用N-TiO2-H进一步探讨煅烧温度、催化剂投加量、pH及降解底物初始浓度对光催化降解反应的影响. 研究表明，400 ℃煅烧下制备的N-TiO2-H具有最佳蓝光催化活性. 当反应pH=7时，0.5 g/L N-TiO2-H在460 nm蓝光照射下2 h可将初始浓度为5 mg/L的MB去除89.7%；当pH=5时，光照1.5 h可将初始浓度为50 mg/L的TTC，去除75.2%.Abstract: Nitrogen-doped titanium dioxide (N-TiO2) photocatalyst was synthesized by mechanochemical, hydrolysis precipitation and sol-gel method respectively. With the application of Methylene blue (MB) and tetraccycline hydrochloride (TTC) as the target pollutants, N-TiO2-H synthesized by hydrolysis precipitation method has high photocatalysis activity under blue LED irradiation, uniform particle distribution and no agglomeration. Therefore, N-TiO2-H was selected to study the effects of calcination temperature, catalyst dosage, pH and initial concentration of organic pollutants by photocatalysis. The results showed that N-TiO2-H calcined at 400 ℃ had the best photocatalytic activity under blue LED light irradiation. Under the dosage of 0.5 g/L N-TiO2-H, the photocatalytic degradation of MB with initial concentration of 5 mg/L, pH=7, MB removal was 89.7% after 2 h, and the photocatalytic degradation of TTC with initial concentration of 50 mg/L, pH=5, TTC removal was 75.2% after 1.5 h.
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图 5 制备方法对N-TiO2光催化降解有机污染物的影响
Figure 5. Effect of preparation methods on photocatalytic degradation of organic pollutants by N-TiO2
图 6 煅烧温度对N-TiO2-H光催化降解有机污染物的影响
Figure 6. Effects of calcination temperatures on photocatalytic degradation of organic pollutants by N-TiO2-H
图 7 投加量对N-TiO2-H光催化降解有机污染物的影响
Figure 7. Effect of dosage on photocatalytic degradation of organic pollutants by N-TiO2-H
图 8 溶液pH对N-TiO2-H光催化降解有机污染物的影响
Figure 8. Effect of solution pH on photocatalytic degradation of organic pollutants by N-TiO2-H
图 9 N-TiO2-H对不同浓度有机污染物降解的影响
Figure 9. Effect of N-TiO2-H on degradation of organic pollutants in different concentrations
图 10 重复使用N-TiO2-H对有机污染物降解的影响
Figure 10. Effect of reuse of N-TiO2-H on degradation of organic pollutants
表 1 实验试剂
Table 1. List of reagents
试剂名称 规格 供应单位 氨水（质量分数25%~28%） 分析纯，AR 上海泰坦科技股份有限公司 尿素 分析纯，AR 国药集团化学试剂有限公司 钛酸四丁酯 分析纯，AR 上海泰坦科技股份有限公司 无水乙醇 分析纯，AR 上海泰坦科技股份有限公司 硝酸 分析纯，AR 上海泰坦科技股份有限公司 TiO2（P25型） 纯度 ≥ 99.5% 德国Degussa有限公司 盐酸四环素（TTC） 分析纯，AR 阿拉丁试剂（上海）有限公司 亚甲基蓝（MB） 分析纯，AR 国药集团化学试剂有有限公司 
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