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以镧掺杂二氧化钛/沸石(La3+-TiO2/沸石)及沸石作为吸附剂,研究了两者吸附对氨基酚的性能。采用可见分光光度法,考察了吸附时间、吸附剂用量、对氨基酚浓度及温度等实验条件对吸附效率的影响。在吸附时间2 h、吸附剂用量0.02 g、对氨基酚初始浓度0.5 mg/L、实验温度20℃的条件下,La3+-TiO2/沸石吸附对氨基酚的能力明显优于未处理的沸石。对氨基酚在两种吸附剂上的吸附均符合准二级动力学模型。吸附过程为吸热过程,吸附等温线复合Langmuir和Freundlich方程。
Lanthanum-doped TiO 2 / zeolite (La 3+ -TiO 2 / zeolite) and zeolite were used as adsorbents to study the adsorption properties of p-aminophenol. Visible spectrophotometry was used to investigate the effects of adsorption time, adsorbent dosage, p-aminophenol concentration and temperature on the adsorption efficiency. The ability of La3 + -TiO2 / zeolite to adsorb p-aminophenol was obviously better than that of untreated zeolite under the conditions of 2 h adsorption time, 0.02 g adsorbent dosage, initial concentration of p-aminophenol 0.5 mg / L and experimental temperature 20 ℃. The adsorption of p-aminophenol on both adsorbents was in accordance with quasi-second-order kinetic model. The adsorption process is endothermic, and the adsorption isotherm composite Langmuir and Freundlich equations.