摘要
以壳聚糖和Cu为改性组分,采用液相还原、置换两步制备出壳聚糖改性纳米铁铜材料(CS-nZVI/Cu),通过单因素实验法考察壳聚糖添加量、Cu负载量以及合成反应温度对去除率的影响。结果表明:壳聚糖改性纳米铁铜材料最佳制备条件为壳聚糖添加量1.2 g,Cu负载量5%,合成反应温度20℃。采用该条件下制备的新型硝酸盐还原材料,在反应温度25℃,溶液初始pH为9,填料投加量2 g/L,振荡强度180 r/min条件下,处理100 mg/L硝酸钠模拟废水,反应时间60 min后,去除率达95.04%。通过一系列表征发现,壳聚糖通过Fe与—NH_(2)的络合作用成功包覆了纳米铁铜粒子,形成球形颗粒状的CS-nZVI/Cu,相较于纳米铁铜(nZVI/Cu),CS-nZVI/Cu排布更均一,具有更好的稳定性和分散性。
The chitosan modified iron-copper nanomaterials(CS-nZVI/Cu)were prepared by liquid-phase reduction and replacement in two steps using chitosan and Cu as modified components.The effects of chitosan addition,Cu loading and synthesis reaction temperature on the removal rate were investigated by single-factor experimental method.The results showed that the optimum preparation conditions for the CS-nZVI/Cu were 1.2 g chitosan addition,5%Cu loading,and 20℃synthesis reaction temperature.The new nitrate reducing material prepared under this condition was used to treat 100 mg/L sodium nitrate simulated wastewater with 95.04%removal rate after 60 min reaction time at the reaction temperature of 25℃,initial pH of solution of 9,filler dosage of 2 g/L and 180 r/min shaking intensity.According to the characterization results,chitosan successfully coated nZVI/Cu nanoparticles through the complexation of Fe with—NH to form spherical particles of CS-nZVI/Cu.Compared with nZVI/Cu,CS-nZVI/Cu was more uniformly arranged and had better stability and dispersibility.
作者
杨文鸿
李子奚
秦冬玲
杨刚
YANG Wen-hong;LI Zi-xi;QIN Dong-ling;YANG Gang(State Key Laboratory of Materials Chemical Engineering,Nanjing Tech University,Nanjing 211800,China)
出处
《应用化工》
CAS
CSCD
北大核心
2022年第4期965-970,共6页
Applied Chemical Industry
基金
国家重点研发计划(2020YFC1806302)
江苏省产学研前瞻性联合研究项目(BY2016005-11)。
关键词
壳聚糖
铜
NZVI
硝酸盐废水
水处理
性能研究
chitosan
Cu
zero-valent iron nanoparticles
nitrate wastewater
water treatment
degradation performance
