几种印染助剂对壳聚糖稳定纳米铁去除酸性品红的影响  

Influence of additives on degradation of acid fuchsine by chitosan-stabilized nanoscale zero-valent iron in water

作　　者：金晓英[1,2] 余兵[1] 杨静[1] 陈祖亮[1,2] 

机构地区：[1]福建师范大学环境科学与工程学院,福州350007 [2]福建省污染控制与资源循环利用重点实验室,福州350007

出　　处：《环境工程学报》2013年第12期4724-4728,共5页Chinese Journal of Environmental Engineering

基　　金：福建师范大学闽江学者人才引进基金资助(200604);福建省教育厅资助项目(JA13071)

摘　　要：以氯化铁为铁源,硼氢化钠为还原剂,壳聚糖为稳定剂,采用液相还原法制备壳聚糖稳定纳米铁(CS-nZVI);研究了印染废水中常见助剂NaNO3、Na2SO4、NaH2PO4、K2Cr2O7、EDTA二钠盐存在下,超声波辅助CS-nZVI对酸性品红(AF)降解的影响。结果表明,反应15 min,0.01 g CS-nZVI对25 mL、100 mg/L AF的去除率高达99.9%;各种助剂的存在使得纳米铁表面不同程度失活,阻碍反应的进行,使得AF的去除率下降。NaNO3、K2Cr2O7、EDTA二钠盐与纳米铁发生反应,与AF存在明显的竞争作用。重复利用实验表明,CS-nZVI重复利用7次仍具有一定的反应活性。此外,CS-nZVI对加标(50 mg/L)实际废水中AF的去除率达到99%以上,表明CS-nZVI是一种潜在的环境修复材料。Chitosan-stabilized zero-valent iron （CS-nZVI） was prepared by chemical reduction in aqueous solution starting from ferric chloride as the raw material, sodium borohydride as reducing agent and chitosan as stabilizing agent. A series of experiments were performed to analyze the influence of several typical additives in dyeing wastewater, including NaNO3, Na2SO4, NaH2PO4, K2Cr2O7 and EDTA-Na2. The results showed that 99.9% of acid fuchsine （AF） was removed from aqueous solution with assisting ultrasound under the conditions, including an initial AF concentration of 100 mg/L,25 mL solution, using 0.01 g CS-nZVI after reacting for 15 min. The presence of additives made the surface of nZVI inactive and hindered the reaction,therefore, decreased the removal of AF. NaNO3 ,K2Cr2OTand EDTA-Na2 could be reduced by CS-nZVI, and they competed with AF obviously. Meanwhile, experiments showed that recycling reuse of CS-nZVI seven times still had certain reactivity. In addition,the removal efficiency of AF in actual dyeing wastewater with addition of 50 mg/L was above 99% using CS-nZVI and it indicated that CS-nZVI will be a kind of potential material of environmental remediation for dyeing wastewater.

关 键 词：壳聚糖 纳米铁 酸性品红 印染助剂 去除率 

分 类 号：X522[环境科学与工程—环境工程]