摘要
采用同轴静电纺丝法制备了MoS2/g-C3N4纳米纤维,采用XRD、FTIR、XPS、UV-Vis和Raman等光谱分析技术表征了催化剂相组成和微观形貌,评价了催化剂表面化学形态和吸光特性,探讨了催化剂对甲苯的光催化降解机理,研究了MoS2含量、光源条件、温度和催化稳定性对降解甲苯的影响规律.结果表明,在MoS2/g-C3N4中掺杂适宜的MoS2有助于提高催化剂活性,改善催化剂比表面积和孔容积.在可见光条件下,催化剂(10%MoS2)对甲苯的降解率为90.24%.由汽车尾气中苯系污染物光催化降解应用可知,在柴油机转速为2000 r·min^-1,油门开度(负荷)分别为25%、50%、75%和100%的条件下,10%MoS2对苯、甲苯、乙苯、对二甲苯、间二甲苯和邻二甲苯的平均降解率分别为88.12%、90.03%、86.25%、87.12%、87.07%和87.23%,表明MoS2/g-C3N4纳米纤维具有较强的光催化降解苯系物能力.
MoS2 / g-C3N4 composite nanofibers were prepared by the coaxial electrospinning method. The crystalline phase and microstructure of MoS2 / g-C3N4 catalysts were displayed by X-ray diffraction ( XRD) and Fourier transform infrared spectroscopy ( FTIR). Absorption characteristics and electrochemical properties of MoS2 / g-C3N4 catalysts were characterized by X-ray photoelectron spectroscopy (XPS), ultraviolet-visible spectrometry (UV- Vis) and Raman spectroscopy. The corresponding influence factors on MoS2 content, light condition, temperature and repeated performance for toluene degradation rate in the photocatalytic activity device were analyzed. The results show that catalytic activity of MoS2 / g-C3N4 was improved through doping appropriate amount of MoS2, and the specific surface area and pore volume of catalysts increased accordingly. with 10% MoS2, MoS2 / g-C3N4 presented 90.24% photocatalytic degradation effieincy for toluene in visible-light illumination. Under four different loads (25%, 50%, 75% and 100%) and diesel engine rotational speed (2000 r·min^-1), average degradation rate of benzene, toluene, ethylbenzene, p-xylene, m-xylene and o-xylene were 88.12%, 90.03%, 86.25%, 87.12%, 87.07% and 87.23% respectively in visible-light illumination. Therefore, it is verified that MoS2 / g-C3N4 catalyst had better photocatalytic activity in reducing benzene homologues emissions from diesel engine exhaust.
作者
晋兵营
胡明江
JIN Bingying;HU Mingjiang(Institute of Mechanical & Electrical Engineering, Zhengzhou Railway Vocational & Technical College, Zhengzhou 451460;School of Energy and Building Environmental Engineering, Henan University of Urban Construction, Pingdingshan 467036)
出处
《环境科学学报》
CAS
CSCD
北大核心
2019年第6期1970-1978,共9页
Acta Scientiae Circumstantiae
基金
国家自然科学基金(No.61803086)
河南省自然科学基金(No.182300410264)
河南省科技攻关计划项目(No.182102210225)
河南省高等学校重点科研项目(No.18A470002)
关键词
柴油机
苯系物
光催化降解
二硫化钼
氮化碳
diesel engine
benzene homologues
photocatalytic degradation
molybdenum disulfide
carbon nitride
作者简介
责任作者:晋兵营(1972-),男,副教授(博士),E-mail:jby996@163.com;.
