NaY分子筛疏水改性及其对汽车涂装VOCs废气的吸附  

Hydrophobic modification of NaY molecular sieve and its adsorption on VOCs exhaust gas from automobile painting

作　　者：刘霞 党小庆[1,2] 曹利 屈嘉鑫[1,2] 寇永康 LIU Xia;DANG Xiaoqing;CAO Li;QU Jiaxin;KOU Yongkang(School of Environment&Municipal Engineering,Xi’an University of Architecture&Technology,Xi’an 710055,China;Key Laboratory of Environmental Engineering of Shaanxi Province,Xi’an 710055,China)

机构地区：[1]西安建筑科技大学环境与市政工程学院,西安710055 [2]陕西省环境工程重点实验室,西安710055

出　　处：《环境工程学报》2023年第11期3689-3697,共9页Chinese Journal of Environmental Engineering

基　　金：国家重点研发计划资助项目(2017YFC0212204);陕西省重点研发计划资助项目(2018ZDCXL-SF-02-04)。

摘　　要：针对水分存在条件下分子筛吸附VOCs吸附容量急剧下降的问题,以汽车涂装过程产生的二甲苯、甲苯、乙酸丁酯为VOCs代表,采用三甲基氯硅烷(TMCS)/正己烷对NaY分子筛进行疏水改性,以提高高湿度条件下分子筛对VOCs的吸附性能。结果表明,最佳的TMCS/正己烷体积比为1:7(NaY-4),在RH=65%条件下,NaY-4对甲苯的吸附量为7.15 mg·g^(-1),是未改性NaY分子筛吸附量的2.58倍,且经5次吸附脱附循环实验,吸附容量仍保持在92.56%以上。BET、XRD、FTIR及接触角等表征结果表明,改性并未对分子筛的晶型结构造成影响,但会减小其比表面积;改性后Si—CH3和Si—O—Si疏水官能团增多,接触角由13.2°增加到121.6°,疏水性增强。该研究结果可为分子筛转轮VOCs吸附技术的工业应用提供参考。In view of the sharp decline of VOCs adsorption capacity in the presence of moisture,the NaY molecular sieve was modified by trimethylchlorosilane(TMCS)/hexane to improve the adsorption performance of molecular sieve for VOCs under high humidity,using xylene,toluene and butyl acetate in automotive painting process as VOCs representatives.The results showed that the optimal volume ratio of TMCS/hexane was 1:7(NaY-4),and the adsorption capacity of NaY-4 for toluene was 7.15 mg·g^(-1)at RH=65%,which was2.58 times as much as the adsorption capacity of unmodified NaY molecular sieve,and the adsorption capacities remained above 92.56%after five adsorption and desorption cycles.The characterization results of BET,XRD,FTIR and contact angle showed that the modification did not affect the crystalline structure of molecular sieve,but reduced its specific surface area.After modification,hydrophobic functional groups of Si—CH_(3)and Si—O—Si increased,the contact angle increased from 13.2°up to 121.6°,and the hydrophobicity was enhanced.The research results can provide references for the industrial application of the molecular sieve runner VOCs adsorption technology.

关 键 词：VOCs吸附 分子筛 涂装行业 疏水改性 

分 类 号：X701[环境科学与工程—环境工程]