秸秆纤维素基水凝胶负载Fe_(3)O_(4)/Cu催化剂还原硝基苯甲酸  

Straw-based hydrogel supported Fe_(3)O_(4)/Cu catalysts for the reduction of nitronitrobenzoic acid

作　　者：李增强 LI Zengqiang(Sinopec Shengli Oilfield Branch,Dongying 257051,China)

机构地区：[1]中国石化胜利油田分公司,山东东营257051

出　　处：《工业水处理》2023年第5期141-148,共8页Industrial Water Treatment

摘　　要：利用废弃小麦秸秆为原料,通过离子液体法制备了小麦秸秆纤维素基水凝胶(SCH),合成了磁性秸秆纤维素基水凝胶负载Fe_(3)O_(4)(SCH@Fe_(3)O_(4))催化剂。将SCH@Fe_(3)O_(4)催化剂经原位固定铜离子和化学还原法合成了原位负载的SCH@Fe_(3)O_(4)/Cu催化剂,并研究了该催化剂活化NaBH_(4)催化还原硝基苯甲酸(NA)的性能。同时,优化了催化剂投加量、NaBH_(4)投加量、NA初始浓度和反应温度对NA催化还原效果的影响。SCH@Fe_(3)O_(4)/Cu催化剂活化NaBH_(4)还原NA的性能优于商品纳米零价铁,该过程能够抵抗水体背景阴离子的干扰,具有优异的稳定性。此外,SCH@Fe_(3)O_(4)/Cu催化剂饱和磁化强度为13.1 emu/g,说明其具有强磁性,易于从水体中分离,实现催化剂的回收利用。利用农作物固体废弃物为原料制备功能性生物质催化剂,并用于水体污染物的治理,实现了“以废治废”的目标。Taking waste wheat straw as raw material,wheat straw cellulose-based hydrogel(SCH)was prepared by ionic liquid method,and a magnetic straw cellulose-based hydrogel-supported Fe_(3)O_(4)(SCH@Fe_(3)O_(4))catalyst was synthesized.Furthermore,the SCH@Fe_(3)O_(4)/Cu catalysts were in situ synthesized by copper stabilization and chemical reduction on the SCH@Fe_(3)O_(4) catalysts.The performance of the SCH@Fe_(3)O_(4)/Cu catalysts was investigated with the activation of NaBH4 for catalytic reduction of nitrobenzoic acid(NA).The effects of catalyst dosage,NaBH4 dosage,initial concentration of NA,and reaction temperature on the removal ratio of NA were optimized.The NA reduction catalyzed by SCH@Fe_(3)O_(4)/Cu catalyst was superior than that of commercial nano zero-valent iron,and could resist the interference of anions in the background of water,exhibiting excellent stability.Moreover,the saturation magnetization of the SCH@Fe_(3)O_(4)/Cu catalysts was 13.1 emu/g,indicating its strong magnetism and ease of separation to realize the recovery of the catalyst.In this study,we utilized crop solid waste as raw material to prepare functional biomass catalysts and applied them to treat water pollutants,achieving the goal of“treating waste with waste”.

关 键 词：小麦秸秆纤维素 水凝胶 催化还原 硼氢化钠 硝基苯甲酸 

分 类 号：X703.1[环境科学与工程—环境工程]