铁基介孔微球的合成、表征及其对水中微量As(V)的吸附  

Fe-based Microsphere: Synthesis,Characterization and Adsorption Performance for Aqueous Trace As(V)

作　　者：聂东阳[1] 黎飞虎[1,2] 周宏仓[1,2] 

机构地区：[1]南京信息工程大学环境科学与工程学院,江苏省环境净化材料工程技术研究中心,江苏省大气环境联合实验室,南京210044 [2]大气环境与装备技术协同创新中心,南京210044

出　　处：《科学技术与工程》2014年第23期265-270,共6页Science Technology and Engineering

基　　金：国家自然科学基金(51002080,51310105009);江苏高校优势学科建设工程项目资助

摘　　要：摘要基于铁基材料对砷的独特的亲合力及介孔材料的高比表面积，用水热法合成铁基介孔微球（Fe—MS），在对其进行系列表征后，考察了其吸附除砷效果。X射线衍射（XRD）和扫描电镜（SEM）表征结果均显示Fe—MS是非晶微球。N2吸附脱附分析结果表明，Fe—Ms具有较大的比表面积（407m^2／g）且呈规整双孔径分布（3．7nm与5．3nm）。吸附As（V）研究结果显示，在pH=3—4，初始As（V）=100ppb时，其去除率达99％以上；吸附等温线符合Langmuir方程；吸附动力学符合准二级动力学方程；Fe—MS对As（V）的吸附效率不受背景离子强度的影响，表明其吸附机理为稳定的球内络合作用。Due to the strong affinity of Fe-based sorbent to Arsenic and high specific surface area of mesoporous material, Fe-based mesoporous microsphere （Fe-MS） was synthesized via hydrothermal method, followed by several characterizations and evaluation as sorbent for arsenate removal. Results of both X-ray diffraction （XRD） and scanning electron microscopy （SEM） demonstrated that Fe-MS was amorphous microsphere..The nitrogen adsorption-desorption experiments indicated its specific surface area was 407 m^2/g with dual peak pore size distribution centered at 3.7 nm and 5.3 nm. The As （V） adsorption experiments showed that, when setting the initial As （V） to 100 ppb and pH to 3 -4, the As removal efficiency of Fe-MS was over 99%, the adsorption isotherm data fitted well with Langmuir equation, and the adsorption kinetics data followed the pseudo-second order rate equation. Moreover, As（V） adsorption by Fe-MS was independent with the ion strength, implying that arsenate was sequestrated by Fe-MS via inner-sphere complexing interaction.

关 键 词：铁基介孔微球 水热法 吸附 砷 

分 类 号：TQ424.2[化学工程]