石墨烯催化臭氧化同步抑制溴酸盐的生成

Synchronous Inhibition of Bromate Formation through Catalytic Ozonation with Graphene

采用改进Hummers方法成功制备出氧化石墨烯(GO)与还原态氧化石墨烯(RGO),将其应用于臭氧氧化过程,考察对溴酸盐生成的控制效果。结果表明,石墨烯在催化臭氧氧化降解有机物的同时能有效抑制溴酸盐的生成。RGO投加量为5~35 mg/L时,与对照组相比溴酸盐的产生量降低80%以上。经初步机制分析,石墨烯对中间产物次溴酸(HOBr/BrO^-)具有还原作用,因而阻碍了次溴酸进一步向溴酸盐转化。

Graphene oxide （ GO） and reduced graphene oxide （ RGO） are prepared according to the improved Hummers method in the experiment. Then RGO is applied in ozone oxidation process to study the control of bromate formation. Results show that bromate is effectively inhibited with simultaneously catalytic ozonation after graphene is dosed. With RGO dosage of 5 ？35 mg/L,the production of bromate is inhibited more than 80% , as compared with bromate in control groups. Preliminary analysis on mechanism shows, the intermediate hypobromite （ HOBr/BrO ） can be reduced by RGO,which consequently cuts down the further reaction of transformation of hypobromite to bromate.