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通过柠檬酸溶胶-凝胶反应,合成了新型功能介孔NiNb2O6吸附剂,通过X-射线粉末衍射仪(XRD)、透射电镜(TEM)和比表面积及孔径分析(BET)对其结构进行表征。通过影响因素实验、吸附动力学实验和等温吸附实验,探讨了NiNb2O6吸附剂对水溶液中亚甲基蓝的吸附性能和机理。结果表明,NiNb2O6介孔吸附剂具有正交相晶体结构,平均粒径为30~200nm,比表面积为66.3m2/g。吸附剂用量、温度和pH值均对吸附行为有一定的影响;在35℃时,亚甲基蓝在吸附剂上吸附行为符合Langmuir方程,吸附动力学符合拟二级动力学方程,初始浓度为40mg/L,pH值为7.03时,0.2g介孔吸附剂NiNb2O6对亚甲基蓝的吸附量最大,吸附过程中液膜扩散为主要速率控制步骤。
A novel mesoporous NiNb2O6 adsorbent was synthesized by citric acid sol-gel reaction. Its structure was characterized by XRD, TEM, BET and BET. Through the influence factor experiment, the adsorption kinetics experiment and the isothermal adsorption experiment, the adsorption performance and mechanism of the NiNb2O6 adsorbent to the methylene blue in the aqueous solution were discussed. The results show that the NiNb2O6 mesoporous adsorbent has the structure of orthorhombic phase with the average particle size of 30 ~ 200nm and the specific surface area of 66.3m2 / g. Adsorption amount, temperature and pH all had certain influence on the adsorption behavior. At 35 ℃, the adsorption behavior of methylene blue on the adsorbent accorded with Langmuir equation, and the adsorption kinetics fit the pseudo second-order kinetic equation. The initial concentration was 40 mg / L At pH 7.03, the adsorption capacity of 0.2g mesoporous adsorbent NiNb2O6 to methylene blue is the largest, and the diffusion of liquid film during the adsorption process is the main rate control step.