g-C3N4/TiO2复合材料制备及其处理罗丹明B研究
收稿日期: 2022-09-19
网络出版日期: 2023-07-13
基金资助
国家自然科学基金项目(51778598);福建省自然科学基金项目(2022J011163);2018、2022、2023年福建省科技特派员资金项目;2020、2021、2022年莆田市科技特派员资金项目;莆田学院功能材料研究创新团队项目(科研［2022］10 号)
Study on preparation of g-C3N4/TiO2 composites and application for rhodamine B removal
Received date: 2022-09-19
Online published: 2023-07-13
为高效去除有机染料，分别以g-C3N4和TiO2为有机半导体和无机半导体原料，通过水热法合成一系列不同质量配比的g-C3N4/TiO2复合材料，利用正交实验L16（45）探究g-C3N4/TiO2复合材料处理罗丹明B模拟印染废水的最适宜工艺条件。结果表明，最适宜工艺条件为：光照时间为180 min、m（g-C3N4）:m（TiO2）为20:30、投加量为2.0 g/L、罗丹明B模拟印染废水质量浓度为20 mg/L、pH为6.50，此时罗丹明B去除率可达98.86%。而单一使用g-C3N4或TiO2对比处理罗丹明B模拟印染废水的去除率分别为52.27%和89.71%，说明TiO2掺杂g-C3N4后可以更好地发挥协同去除性能。通过捕获活性物种实验可知，超氧自由基（·O2-）和光生空穴（h+）起关键性作用。g-C3N4/TiO2复合材料重复使用4次后，去除率仍可达90.79%。g-C3N4/TiO2复合材料能够降低能耗且无二次污染，可为今后处理染料废水提供借鉴。
陈彰旭 , 朱丹琛 , 傅明连 . g-C3N4/TiO2复合材料制备及其处理罗丹明B研究[J]. 无机盐工业, 2023 , 55(7) : 130 -136 . DOI: 10.19964/j.issn.1006-4990.2022-0565
In order to improve the organic dye removal performance，a series of g-C3N4/TiO2 composites with different mass ratios were synthesized by hydrothermal method with using g-C3N4 as organic semiconductor and TiO2 as inorganic semiconductor.The orthogonal test L16（45） was used to explore the optimal process conditions for g-C3N4/TiO2 composites to treat rhodamine B simulated printing and dyeing wastewater.The results showed that the optimum conditions were as the following：the light time was 180 min，the mass ratio of g-C3N4 to TiO2 was 20:30，the dosage of g-C3N4/TiO2 was 2.0 g/L，the concentration of rhodamine B was 20 mg/L，the pH value was 6.50，the removal rate was up to 98.86%.However，the removal rate of g-C3N4 and TiO2 for rhodamine B were 52.27% and 89.71%，respectively，which was indicated that g-C3N4 doped with TiO2 could enhance the synergistic removal efficiency of Rhodamine B.Radical scavenger experiments showed that superoxide radical（·O2-） and photogenerated holes（h+） played a crucial role.The removal rate of rhodamine B could reach 90.79% after four cycles of g-C3N4/TiO2 composites.The result indicated that g-C3N4/TiO2 composites could reduce energy consumption and cause no secondary pollution，which would provide reference for wastewater treatment in the future.
Key words： g-C3N4; TiO2; rhodamine B; printing and dyeing wastewater
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