State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (SKLUWRE, HIT), Harbin 150090, PR China.
J Hazard Mater. 2012 Mar 30;209-210:226-32. doi: 10.1016/j.jhazmat.2012.01.014. Epub 2012 Jan 11.
In this study, a novel adsorbent referred to as a lipoid adsorption material (LAM) was synthesized with a hydrophobic nucleolus (triolein) and hydrophilic membrane structure (polyamide). The LAM was applied to the adsorption and removal of nitrobenzene from aqueous systems. Experiments were carried out to investigate the adsorption behavior of nitrobenzene on LAM, including the development of adsorption isotherms, the determination of adsorption kinetics, and to explore the influence of adsorbent dosage, contact time, temperature and the initial concentration of nitrobenzene on adsorption. The performance of LAM was compared with equal amounts of granular activated carbon (GAC) for adsorption. The adsorption isotherms for LAM were found to be described by the Linear equation, while the adsorption isotherms for granular activated carbon (GAC) were described by the Freundlich equation. Results indicated that the adsorption of nitrobenzene by LAM occurred mainly due to the partition function caused by the triolein nucleolus. Two kinetics models, pseudo-first-order and pseudo-second-order models were used to fit the experimental data for LAM adsorption. By comparing the correlation coefficients, it was found that the pseudo-first-order model was most suitable to describe the adsorption of nitrobenzene on LAM. The results also indicated that the factors that affect the adsorption rate would be either the nitrobenzene concentration or the character of the adsorbent. Thermodynamic calculations indicated that the adsorption of nitrobenzene on LAM was spontaneous and was an exothermic reaction. With an initial nitrobenzene concentration of 200 μg l(-1), an equilibrium concentration was reached within 8h using LAM as an adsorbent and the average removal efficiency was 94.3%. For GAC, the adsorption equilibrium was achieved after 12h with a 91.9% nitrobenzene removal efficiency.
在这项研究中，合成了一种新型吸附剂，称为脂吸附材料（LAM），它具有疏水性核（三油酸甘油酯）和亲水膜结构（聚酰胺）。LAM 被应用于从水系统中吸附和去除硝基苯。进行了实验以研究硝基苯在 LAM 上的吸附行为，包括吸附等温线的开发、吸附动力学的确定，并探索了吸附剂用量、接触时间、温度和硝基苯初始浓度对吸附的影响。将 LAM 的性能与等量的颗粒状活性炭（GAC）进行了比较。发现 LAM 的吸附等温线由线性方程描述，而颗粒状活性炭（GAC）的吸附等温线由 Freundlich 方程描述。结果表明，LAM 对硝基苯的吸附主要是由于三油酸甘油酯核引起的分配函数所致。使用伪一阶和伪二阶模型来拟合 LAM 吸附的实验数据。通过比较相关系数，发现伪一阶模型最适合描述硝基苯在 LAM 上的吸附。结果还表明，影响吸附速率的因素将是硝基苯的浓度或吸附剂的性质。热力学计算表明，LAM 对硝基苯的吸附是自发的，是放热反应。在初始硝基苯浓度为 200μg l(-1)时，使用 LAM 作为吸附剂，8 小时内达到平衡浓度，平均去除效率为 94.3%。对于 GAC，在 12 小时内达到吸附平衡，硝基苯去除效率为 91.9%。
