摘要
为了提升碳纳米管对过硫酸盐的催化活性,通过化学处理分别得到表面氨基化、羟基化和羧基化改性的碳纳米管材料(CNT-NH_(2)、CNT-OH、CNT-COOH)。采用SEM和XPS对材料结构进行了表征,并测试了其激活过硫酸盐(PDS)降解偶氮染料酸性橙(AO7)的性能。结果表明:氨基和羟基改性能够显著增强CNT的催化活性,其中,CNT-NH_(2)在60 min内能够降解超过95%的AO7溶液(0.1 mmol/L,100 mL),反应速率远高于原始CNT以及CNT-OH和CNT-COOH,这是由于氨基改性提高了CNT表面的正电性,从而促进PDS和AO7在CNT-NH_(2)上的吸附和反应;机理研究表明,非自由基电子转移是CNT-NH_(2)/PDS体系的主要氧化途径,因此,该催化体系在pH值为3~11的范围内保持稳定的催化活性且对于实际水体具有较好的适应能力。
To improve the catalytic activity of carbon nanotubes in persulfate activation,amino,hydroxyl and carboxyl modified carbon nanotubes(CNT-NH_(2),CNT-OH,CNT-COOH)were prepared by chemical treatment.The as-prepared materials were characterized by SEM and XPS,and the oxidation of azo dye AO7 by CNT were also tested.The results showed that amino and hydroxyl modification could significantly enhance AO7 oxidation.Among them,CNT-NH_(2) could degrade more than 95%0.1 mmol/L AO7 solution(100 mL)within 60 min,and the reaction rate was much higher than that of the original CNT,CNT-OH and CNT-COOH.This was attributed to the amino modification which improved the positively charge of CNT surface,thereby promoting the adsorption and reaction of PDS and AO7 on CNT-NH_(2).Mechanistic studies implied that non-radical electron-transfer process was the main oxidation pathway of CNT-NH_(2)/PDS system,which maintained stable catalytic activity in a wide pH value range(3-11),and had good adaptability to actual water matrixes.
作者
王骏
佟显东
叶布天
尚雨佳
于子钧
张阳
WANG Jun;TONG Xiandong;YE Butian;SHANG Yujia;YU Zijun;ZHANG Yang(State Key Laboratory of Separation Membranes and Membrane Processes,Tiangong University,Tianjin 300387,China;School of Environmental Science and Engineering,Tiangong University,Tianjin 300387,China;School of Material Science and Engineering,Tiangong University,Tianjin 300387,China;School of Textile Science and Engineering,Tiangong University,Tianjin 300387,China)
出处
《天津工业大学学报》
CAS
北大核心
2023年第4期28-35,43,共9页
Journal of Tiangong University
基金
国家自然科学基金资助项目(21906117,52170008)
中国博士后科学基金(2018T110201,2017M620092)
天津市高等学校大学生创新创业训练计划项目(202110058123)。
关键词
官能团改性
碳纳米管
表面改性
过硫酸盐
催化降解
水体净化
非自由基氧化
functional group modifyication
carbon nanotubes
surface modification
persulfate
catalytic degradation
water purification
nonradical oxidation
作者简介
第一作者:王骏(1990-),男,博士,副教授,主要研究方向为环境功能材料与污染控制化学。E-mail:jun.wang@tiangong.edu.cn;通信作者:于子钧(1988-),男,博士研究生,讲师,主要研究方向为多孔碳和纤维材料的制备及其环境功能应用。E-mail:yuzijun@tiangong.edu.cn。
