介质阻挡放电诱导固定碳基还原床低温脱除NO的研究

针对低温脱硝的技术需求,本文建立了介质阻挡放电(DBD)诱导固定碳基还原床(FCRB)负载锰催化剂的新型原位还原脱硝系统(DBD-Mn/FCRB),与单DBD和DBD-FCRB系统相比,该系统具有最佳的脱硝性能,NO转化率和N_(2)选择性可分别达到90.9%和79.9%。该系统具有较强的抗氧冲击性能和抗水性。此外,结合表面微观特性分析,提出了3种可能的脱硝反应路径。研究结果可为低温脱硝提供参考思路。

Enhancing CO_(2) transport with plasma-functionalized ionic liquid membranes

The ionic liquid(IL) 1-butyl-3-methylimidazolium tetrafluoroborate treated with radiofrequency plasma is proposed for functionalization and immobilization on polyethersulfone supports to form supported ionic liquid membranes for CO_(2) separation.The effects of treatment time and transmembrane pressure difference on CO_(2) permeance were evaluated.The best gas permeation performance was obtained with a treatment time of 10 min and the transmembrane pressure difference was 0.25 MPa.Characterization of the materials by Fourier transform infrared spectroscopy,x-ray photoelectron spectroscopy and nuclear magnetic resonance spectroscopy demonstrates that the IL is grafted with carboxyl groups and deprotonated through plasma treatment.A preliminary mechanism for the plasma treatment and facilitated transport of CO_(2)has been proposed on this basis.

低温等离子体技术在VOCs治理中的应用及局限性

针对低温等离子体技术在VOCs治理领域存在的困境,介绍了当前该技术的应用现状及存在的主要问题,并对应用技术的适用范围、关键因素进行了分析,总结了低温等离子体去除VOCs效果的影响因素,如放电方式、反应器结构、运行参数、装机功率等,并对该技术的应用前景进行了展望。

紫外LED光催化降解三甲胺的实验研究

设计了一个光催化降解三甲胺用平板型反应装置,分别以紫外LED灯(UV-LED,峰值波长367.4 nm,半宽7.2 nm)与紫外荧光灯(主波长354.2 nm,半宽37.4 nm)作为光源,纳米TiO_2薄膜作为光催化剂。实验研究了三甲胺浓度、相对湿度和含氧量对三甲胺降解率的影响,比较了UV-LED灯与紫外荧光灯降解三甲胺的效率以及优缺点。实验结果表明,在相同辐照度下,UV-LED辐照的三甲胺的降解率、碳平衡、CO_2和CO产率都高于紫外荧光灯,说明UV-LED灯可取代紫外荧光灯用于光催化降解三甲胺;三甲胺初始浓度越高,降解率越低;对于两种光源,相对湿度在20%时光催化效果最佳。最后分析了三甲胺光催化降解的中间产物。