无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2023, Vol. 55 ›› Issue (7): 130-136.doi: 10.19964/j.issn.1006-4990.2022-0565

• 催化材料 • 上一篇    

g-C3N4/TiO2复合材料制备及其处理罗丹明B研究

陈彰旭1,2,3(), 朱丹琛1,2,3, 傅明连1,2,3   

  1. 1.莆田学院环境与生物工程学院,福建 莆田 351100
    2.福建省新型污染物生态毒理效应与控制重点实验室,福建 莆田 351100
    3.福建省高校生态环境及其信息图谱重点实验室,福建 莆田 351100
  • 收稿日期:2022-09-19 出版日期:2023-07-10 发布日期:2023-07-13
  • 作者简介:陈彰旭(1977— ),男,博士,副教授,主要从事环境功能材料研究;E-mail:xuzhangchen@163.com
  • 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

CHEN Zhangxu1,2,3(), ZHU Danchen1,2,3, FU Minglian1,2,3   

  1. 1. College of Environmental and Biological Engineering,Putian University,Putian 351100,China
    2. Fujian Provincial Key Laboratory of Ecology-Toxicological Effects & Control for Emerging Contaminants,Putian 351100,China
    3. Key Laboratory of Ecological Environment and Information Atlas,Fujian Provincial University,Putian 351100,China
  • Received:2022-09-19 Published:2023-07-10 Online:2023-07-13

摘要:

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。

关键词: g-C3N4, TiO2, 罗丹明B, 印染废水

Abstract:

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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