PDF《污染物》

第39 卷第

6 期2019 年6月环境科学学报Acta Scientiae Circumstantiae Vol.

39,No.6 Jun.,

2019 收稿日期:2018?11?16 修回日期:2018?12?23 录用日期:2018?12?23 基金项目: 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) 作者简介: 晋兵营(1972―),男,副教授(博士),E?mail:jby996@ 163.com;

?责任作者 DOI:10.13671 / j.hjkxxb.2018.0471 晋兵营, 胡明江.2019.MoS2 / g?C3 N4 纳米纤维光催化降解柴油机苯系排放污染物[J].环境科学学报,39(6):1970?1978 Jin B Y, Hu M J. 2019.Photocatalytic degradation of benzene homologues in diesel engine by MoS2 / g?C3 N4 nanofibers[J].Acta Scientiae Circumstantiae, 39(6):1970?1978 MoS2 / g?C3 N4 纳米纤维光催化降解柴油机苯系排放 污染物 晋兵营1,? , 胡明江2 1. 郑州铁路职业技术学院机电工程学院,郑州

451460 2. 河南城建学院能源与建筑工程学院,平顶山

467036 摘要:采用同轴静电纺丝法制备了 MoS2 / g?C3 N4 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?C3 N4 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?C3 N4 纳米纤维具有较强的光催化降解苯系物能力. 关键词:柴油机;

苯系物;

光催化降解;

二硫化钼;

氮化碳 文章编号:0253?2468(2019)06?1970?09 中图分类号:X701 文献标识码:A Photocatalytic degradation of benzene homologues in diesel engine by MoS2 / g? C3N4 nanofibers JIN Bingying1,? , HU Mingjiang2 1. Institute of Mechanical &

Electrical Engineering, Zhengzhou Railway Vocational &

Technical College, Zhengzhou

451460 2. School of Energy and Building Environmental Engineering, Henan University of Urban Construction, Pingdingshan

467036 Abstract: MoS2 / g?C3 N4 composite nanofibers were prepared by the coaxial electrospinning method. The crystalline phase and microstructure of MoS2 / g?C3 N4 catalysts were displayed by X?ray diffraction ( XRD) and Fourier transform infrared spectroscopy ( FTIR). Absorption characteristics and electrochemical properties of MoS2 / g?C3 N4 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?C3 N4 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?C3 N4 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?C3 N4 catalyst had better photocatalytic activity in reducing benzene homologues emissions from diesel engine exhaust. Keywords: diesel engine;