铁改性斜发沸石的制备及吸附Sb(Ⅴ)效果研究

PREPARATION OF IRON MDIFIED CLINOPTILOLITE AND ITS ADSORPTION RESULTS ON Sb(Ⅴ)

用不同浓度的FeCl_3·6H_2O溶液对斜发沸石进行改性,制得铁改性斜发沸石(IMC),采用XRD,FTIR对改性前后的斜发沸石进行表征,消解后用原子吸收光谱仪对IMC表面负载铁量进行测定。以KSb(OH)6为Sb(Ⅴ)锑源、IMC为吸附剂,研究IMC对Sb(Ⅴ)的吸附去除效果。探讨了IMC载铁量、吸附时间、Sb(Ⅴ)初始浓度与吸附量的关系。结果表明:IMC对Sb(Ⅴ)的吸附量随载铁量的增加而增大,IMC90对Sb(Ⅴ)的吸附量为36.27×10^(-3);斜发沸石是羟基氧化铁(FeOOH)的优良载体;IMC_(50)吸附Sb(Ⅴ)所需平衡时间约12h;IMC_(50)对Sb(Ⅴ)的最大吸附量为35.05×10^(-3),是天然斜发沸石的9倍多;Elovich模型能较好反映吸附动力学过程;吸附等温线符合Langmuir模型和Freundlich模型;IMC50吸附处理Sb(Ⅴ)后3 333cm^(-1)处羟基宽化特征峰、695cm^(-1)和642cm^(-1)处的FeOOH特征峰强度明显降低,羟基宽化特征峰和695cm^(-1)处的FeOOH特征峰分别偏移到3 323cm^(-1)和694cm^(-1)处,Sb(Ⅴ)与羟基氧化铁(FeOOH)之间发生了络合反应。

Modification of clinoptilolite with different concentration of FeC13 · 6H2O solution obtained iron modified clinoptilolite （IMC）. The clinoptilolite was characterized by XRD,FTIR before and after modification, and the iron load content was measured by atomic absorption spectrometer on the surface of IMC after it was digested. The adsorption and removal effect of IMC on Sb （Ⅴ） was studied with KSb（OH）6 as Sb （Ⅴ） antimony source and IMC as adsorbent,and the relationship among the iron load content of IMC, the adsorption time, the initial concentration of Sb （Ⅴ ） and the adsorption capacity were discussed. It was showed that the adsorption capacity of Sb（ Ⅴ ） by IMC increases with the increase of the amount of loaded iron,The adsorption-capacity of IMC90 on Sb（Ⅴ ） was 36.27 × 10-3. Clinoptilolite was an excellent carrier of ferric hydroxide （FeOOH） ,and it took 12 hours to reach equilibrium state for the adsorption of IMC50 on Sb （V）. It was revealed that the maximum adsorption capacity of IMC50 on Sb （ ν ） was 35.05 × 10.3 , 9 times than that of natural clinoptilolite. Elovich model can reflect the adsorption kinetic process. The Langmuir and Freundlich isotherm best described the adsorption behavior of Sb （V） by IMC50. After the absorption of IMC50 on Sb（ V ）, its intensity of hydroxyl bond adsorption characteristics of wide peaks at 3 333 cm-1 ,characteristics peaks of FeOOH at 695 cm-1 and 642 cm-1 decreased significantly. Hydroxyl bond adsorption characteristics of wide peaks and characteristic peaks of FeOOH at 695 cm-1 shifted to 3 323 cm-1 and 694 cm-1respectively,involved in a complication reaction between Sb （V） and hydroxyl-oxide iron.