摘要
采用水热法合成铁、锰双金属掺杂MCM-41(Fe-Mn-MCM-41),并将其用于控制催化臭氧氧化含溴水体中溴酸盐的生成,研究了初始pH、叔丁醇(TBA)、磷酸盐等对溴酸盐抑制效果的影响.结果表明:当溶液初始pH为5.0~9.0时,溴酸盐生成量随pH的升高而增加,pH=5.0时催化剂对溴酸盐的抑制率达到85.9%.TBA的加入使单独臭氧氧化与催化臭氧氧化体系中溴酸盐的生成量明显降低,当加入0.1mmol/LTBA后,溴酸盐分别减少67.7%和81.1%.磷酸盐的加入(1、5、10mg/L)会降低溴酸盐的生成量,当加入1mg/L磷酸盐时,单独臭氧氧化与催化臭氧氧化体系中溴酸盐的抑制率分别达到29.6%和82.5%.此外,还研究了体系中生成的HOBr与H2O2的浓度,结果表明:单独臭氧氧化体系中次溴酸的浓度高于催化臭氧氧化过程,说明催化臭氧氧化过程是通过阻止Br-氧化生成HOBr/OBr-抑制溴酸盐的生成;Fe-Mn-MCM-41/O3中的H2O2浓度高于O3过程,而H2O2是一种溴酸盐抑制物,证明了催化剂的加入可以提高对溴酸盐的抑制率.因此,Fe-Mn-MCM-41是一种可用于控制含溴水体中溴酸盐生成的臭氧氧化催化剂.
Bimetallic MCM-41 (Fe-Mn-MCM-41) was synthesized with the hydrothermal method and used to control bromate formation during ozonation of bromide-containing water. The influences of the initial pH,t -butanol (TBA) and phosphate on the inhibition of bromate were investigated. The results showed that the bromate formation increased with the increased pH within the range of 5.0-9.0 and the efficiency of bromate inhibition with Fe-Mn-MCM-41 reached 85.9% at pH 5 in the catalytic ozoantion process. The bromate decreased in the presence of TBA in both processes involving O 3 and Fe-Mn-MCM-41/O 3,and the efficiency of bromate inhibition were 67.7% and 81.1% respectively when 0.1 mM TBA was added. The addition of phosphate (1,5,10 mg/L) reduced bromate formation during ozonation and catalytic ozonation,and the bromate decreased to 29.6% and 82.5% respectively in the processes involving O 3 and Fe-Mn-MCM-41/O 3 in the presence of 1 mg/L phosphate. Additionally,the concentration of HOBr and H 2O 2 was tested. Compared with the ozonation process,the concentration of HOBr in catalytic ozonation was lower. The results showed that Fe-Mn-MCM-41 could prevent the production of HOBr to inhibit bromate formation. Besides,H 2O 2 was an inhibitor of bromate and more H 2O 2 was found in the Fe-Mn-MCM-41/O 3 process than in the O 3 process,which suggested that Fe-Mn-MCM-41 enhanced the efficiency of bromate inhibition. Therefore,Fe-Mn-MCM-41 was a catalyst that could decrease the formation of bromate in bromide-containing water during the catalytic ozonation process.
作者
薛颖
李旭凯
吴颖
李来胜
XUE Ying;LI Xukai;WU Ying;LI Laisheng(School of Chemistry and Environment,South China Normal University,Guangzhou 510006,China)
出处
《华南师范大学学报（自然科学版）》
CAS
北大核心
2019年第2期56-61,共6页
Journal of South China Normal University(Natural Science Edition)
基金
国家高技术研究发展计划项目(2013AA06A305)
广州市科技计划项目(201607010276)
