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通过平衡试验分析了多壁碳纳米管(MWNTs)及MWNTs/TiO_2复合材料对氧乐果的吸附行为,探讨了两种材料的吸附热力学与动力学特性。结果表明,p H值对两种材料吸附性能的影响不大,在相同条件下,MWNTs和MWNTs/TiO_2对水中氧乐果的吸附量随初始浓度的增加而增大,对100 mg/L氧乐果溶液的最大吸附量分别为74.9和5.4 mg/g。两种材料的吸附过程均符合假二级动力学模型,且MWNTs/TiO_2对氧乐果的吸附速率为0.012 7 g/(mg·min),约为MWNTs的10倍,说明MWNTs/TiO_2具备更强的吸附能力。两种材料的吸附等温线均可用Freundlich等温吸附模型描述。
Adsorption behavior of omethoate by MWNTs and MWNTs / TiO_2 composites was analyzed by equilibrium test. The adsorption thermodynamic and kinetic properties of the two materials were discussed. The results showed that p H value had little effect on the adsorption performance of the two materials. Under the same conditions, the adsorption capacity of MWNTs and MWNTs / TiO 2 to omethoate increased with the initial concentration, The maximum absorption of dimethoate solution were 74.9 and 5.4 mg / g, respectively. The adsorption processes of the two materials are in accordance with the pseudo second-order kinetic model, and the adsorption rate of MWNTs / TiO_2 to omethoate is 0.012 7 g / (mg · min), which is about 10 times that of MWNTs, indicating that MWNTs / TiO_2 has more Strong adsorption capacity. The adsorption isotherms for both materials can be described by the Freundlich adsorption isotherm model.