镧改性活性炭纤维高效吸附去除对苯醌

Efficient adsorptive removal of p-benzoquinone by lanthanum modified activated carbon fibre

水处理中稀土元素一般用于砷、磷等无机污染物的吸附去除,将稀土元素镧负载在活性炭纤维上,首次用于吸附去除水中的有机污染物对苯醌。研究发现,经0.01 mol/L的La(OH)3和超声处理的活性炭纤维吸附去除对苯醌的效率最高。改性活性炭纤维对对苯醌的吸附去除受p H的影响较大,在酸性和中性条件下的吸附效果较好。对吸附动力学数据进行线性和非线性模拟,结果表明,准二级动力学模型更适合描述吸附动力学过程。热力学研究表明,对苯醌在改性活性炭纤维(ACF-2)表面以单分子层吸附为主,经Langmuir吸附等温方程模拟,298 K时对苯醌在ACF-2上的最大吸附量为149.4 mg/g。同时,降低反应温度利于吸附去除对苯醌,表明该吸附过程为自发放热的反应过程。

Rare earth elements are usually used for adsorptive removal of inorganic pollutants such as arse- nic and phosphate. In this study, lanthanum elements were immobilized onto activated carbon fibers and then used for innovative adsorptive removal of p-benzoquinone. It was found that the activated carbon fibers treated with 0.01 mol/L La（OH） 3 and ultrasonication outperformed other modified activated carbon fibers in p-benzoquinone removal. Acidic and neutral pH conditions proved to be favorable for the adsorption process. Through linear and non-linear kinetic simulations,the sorption kinetic curve was proved to fit well with the pseudo-second-order ki- netic model. Thermodynamic analysis indicated that monolayer adsorption occurred on the modified activated car- bon fibers （ACF-2） during p-benzoquinone adsorption. The maximum adsorption capacity of p-benzoquinone on ACF-2 was 149.4 mg/g according to the Langmuir isotherm model. A low adsorption temperature favored the ad- sorption process,which implied that the adsorption process was spontaneous and exothermie.