摘要
针对钛凝胶(titanium xerogel,TAX)对三价砷[As(Ⅲ)]的吸附容量高(254 mg·g^(-1))但速率慢的问题,通过浸渍法,将TAX负载到活性炭、海绵及树脂材料制备负载型吸附剂,并评价其除砷性能.除海绵外,活性炭和树脂均能成功负载TAX,其中活性炭基材料的钛负载量在1.4%左右,树脂基材料在5%左右.树脂和活性炭的负载均提高了TAX的除砷速率,且树脂基材料提高的程度更明显.对于初始质量浓度为1.0 mg·L^(-1)的As(Ⅲ)溶液,树脂基材料(TAX@D201)的吸附速率为0.85 mg·(g·min)^(-1),是未负载TAX吸附速率[0.04 mg·(g·min)^(-1)]的21倍.在处理实际含砷地下水的柱实验中,TAX@树脂的有效床体积(BV)达560 BV,是相同金属负载量载铁树脂材料的2.8倍(199 BV).本文结果表明将TAX负载于大孔树脂是一条有效的策略,为TAX应用于含砷地下水的净化提供了新思路.
Although the adsorption capacity of titanium xerogel(TAX)for arsenite(As(Ⅲ))is high(254 mg·g^(-1)),the adsorption rate is slow.Therefore,TAX was loaded onto activated carbon,sponge,and resin to fabricate a supported adsorbent,and the arsenite removal performance was evaluated.Except sponge,activated carbon and resin could successfully load TAX.The results showed that resin and activated carbon loaded TAX improved the As(Ⅲ)removal performance,and more significantly by the resinbased materials.Through wet digestion and adsorption kinetics experiments,the amount of titanium loaded was approximately 1.4%and 5%in the activated carbon-based(TAX@AC)and resin-based(TAX@resin)materials,respectively.For the initial concentration of 1.0 mg·L^(-1)As(Ⅲ)solution,the adsorption rate constant of TAX@D201 was 0.85 mg·(g·min)^(-1),which was 21 times higher than that of unloaded TAX[0.04 mg·(g·min)^(-1)].Columns packed with TAX@resin could effectively lower arsenite concentration for up to 560 bed volumes,which is 2.8 times greater than that of the iron-based composites with the same metal mass.Therefore,loading TAX on macroporous resin is an effective strategy and provides an effective approach for the application of TAX in arsenite-containing groundwater.
作者
孙晔洋
周畅
甘永海
吴兵党
张淑娟
SUN Ye-yang;ZHOU Chang;GAN Yong-hai;WU Bing-dang;ZHANG Shu-juan(State Key Laboratory of Pollution Control and Resource Reuse,School of the Environment,Nanjing University,Nanjing 210023,China)
出处
《环境科学》
EI
CAS
CSCD
北大核心
2021年第11期5460-5471,共12页
Environmental Science
基金
国家重点研发计划项目(2019YFC0408302)
江苏省重点研发计划社会发展项目(BE2018702)。
