铁改性酵母粉对锑酸盐的吸附机理  

Adsorption mechanism of antimonate by iron modified yeast powder

作　　者：唐林茜 张春华[2] 葛滢[1] TANG Linxi;ZHANG Chunhua;GE Ying(College of Resources and Environmental Sciences,Nanjing Agricultural University,Nanjing,210095,China;Laboratory Centre of Life Science,Nanjing Agricultural University,Nanjing,210095,China)

机构地区：[1]南京农业大学资源与环境科学学院,南京210095 [2]南京农业大学生命科学实验中心,南京210095

出　　处：《环境化学》2023年第1期241-252,共12页Environmental Chemistry

基　　金：国家自然科学基金(31770548,32171623)资助.

摘　　要：采用氯化铁(FeCl_(3))制备了铁改性酵母粉,测试其对溶液中锑酸盐(Sb(V))的吸附性能,考察了FeCl_(3)浓度、溶液pH以及酵母粉投加量对Sb(V)去除的影响,研究了Sb(V)在铁改性酵母粉表面的吸附动力学、吸附等温线特征,并用SEM-EDS、ATR-FTIR、XRD、XPS等方法对改性酵母粉进行表征以探究其吸附机理.结果表明,改性酵母粉吸附Sb(V)的最佳条件为:FeCl_(3)浓度0.5 mol·L^(-1)、酵母粉投加量2 g·L^(-1)、pH 3.0.5 mol·L^(-1) FeCl_(3)改性酵母粉(0.5 Fe-Y)对溶液中Sb(V)的最大去除率为91.2%,吸附容量达68.15 mg·g^(−1).0.5 Fe-Y对Sb(V)的吸附符合伪二级动力学和Langmuir等温线模型,该吸附过程属于化学吸附,涉及络合反应和静电吸附.FeCl_(3)改性能显著增强酵母粉对Sb(V)的吸附能力,酵母粉表面羟基等官能团增多、电位增加、晶形结构更加无序以及表面羟基铁与Sb(V)形成内层络合物是其Sb(V)吸附能力增强的原因.Iron modified yeast powder was synthesized and tested for its ability to adsorb antimonate(Sb(V))from aqueous solution.Batch experiments were performed to investigate the effects of various parameters,including FeCl_(3) concentration,pH,and dosage of yeast powder on the Sb(V)removal.Antimonate adsorption kinetics and isotherm characteristics were investigated and the Sb(V)adsorption mechanism was explored by scanning electron microscopy-energy dispersive X-ray spectroscopy(SEM-EDS),attenuated total reflectance-Fourier transform infrared spectroscopy(ATR-FTIR),X-ray diffraction(XRD)and X-ray photoelectron spectroscopy(XPS).The optimal conditions for Sb(V)adsorption by the modified yeast powder were as follows:FeCl_(3) concentration 0.5 mol·L^(-1),dosage 2 g·L^(-1),and pH 3.The maximum Sb(V)removal rate and adsorption capacity of 0.5 mol·L^(-1) FeCl_(3) modified yeast powder(0.5 Fe-Y)were 91.2%and 68.15 mg·g^(−1),respectively.The adsorption data well fitted the pseudo-second-order kinetic model and Langmuir isotherm model.The Sb(V)adsorption process showed chemical nature,involving complexation and electrostatic adsorption.The FeCl_(3) modification significantly enhanced the Sb(V)adsorption capacity of yeast powder.This could be attributed to increase of hydroxyl and other functional groups,zeta potential,more disordered crystal structure on the surface of iron modified yeast powder and formation of inner-sphere complexes between surface hydroxyl iron and Sb(V).

关 键 词：铁改性 酵母 Sb(V) 吸附. 

分 类 号：X703[环境科学与工程—环境工程]