摘要
采用水热法合成铈掺杂MCM-41(Ce-MCM-41)介孔分子筛,并将其用于臭氧氧化水中腐殖酸,研究了催化剂质量浓度、铈掺杂量、反应温度和初始pH对腐殖酸降解及矿化的影响.结果表明,腐殖酸在Ce-MCM-41/O3体系内可实现有效降解.与单独臭氧氧化相比,Ce-MCM-41催化剂的加入可提高臭氧氧化腐殖酸的矿化效果.催化剂质量浓度为100 mg/L时,具有较好的催化活性,反应60 min,溶解性有机碳(DOC)去除率为70.58%(n(Si)∶n(Ce)=80);3种铈掺杂量催化剂的添加均能提高腐殖酸矿化效果.在278~308 K实验范围内,腐殖酸溶液的DOC去除率和UV254去除率均随反应温度升高而提高.溶液初始pH为6.0~8.5时,DOC去除率随碱性增强而略微下降.表明温度和溶液初始pH影响催化臭氧氧化去除腐殖酸的效果.此外,还考察了添加Ce-MCM-41对含溴水臭氧氧化过程中溴酸盐生成的影响,与单独臭氧相比,加入1.00 g Ce-MCM-41分子筛,溴酸盐生成量减少了46.94%,表明添加Ce-MCM-41分子筛可抑制溴酸盐的生成.因此,Ce-MCM-41分子筛可用于提高臭氧氧化腐殖酸效果和减少含溴水臭氧氧化过程中溴酸盐的生成.
Ce-MCM-41 was directly synthesized by a hydrothermal method and applied as a heterogeneous catalyst for ozonation of humie acid （HA） in aqueous solution. The influences of different factors on removal and minerali- zation of humic acid were investigated, such as catalyst dosage, cerium doped content, temperature and initial pH. The results showed that humic acid could be efficiently degraded in Ce-MCM-41/03 system. Compared with ozona- tion alone, Ce-MCM-41 can enhance the mineralization of HA. As the catalyst dosage was 100 rag/L, the catalyst have good activity for ozonation of HA and DOC removal was 70.58% （n（Si） ：n（Ce） = 80） after 60 rain reaction. The addition of three different amounts of cerium doped catalysts was good for mineralization of HA. And DOC re- moval and reduction of UV254 were increased with reaction temperature in the range of 288-308 K. As the range of initial pH was 6.0-8.5, DOC removal was slightly decreased with the increase of initial pH of HA solution. It showed that temperature and initial pH of HA solution had an impact on the removal of HA. Additionally, the effects of Ce-MCM-41 on bromate formation in bromide-containing water were also investigated. Compared with ozonation alone, adding 1.00 g Ce-MCM-41 contributed to reducing 46.94% bromate. The results implied that the bromate formation was effectively inhibited by Ce-MCM-41. Ce-MCM-41 could improve the efficiency of ozona- tion of HA and reduction of bromate formation during ozonation of bromide-containing water.
出处
《华南师范大学学报（自然科学版）》
CAS
北大核心
2017年第2期73-79,共7页
Journal of South China Normal University(Natural Science Edition)
基金
国家自然科学基金项目(21247004)
