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载镧生物质炭吸附水体中As(Ⅴ)的过程与机制 (Adsorption of As(Ⅴ) from Aqueous Solution by Lanthanum Oxide-loaded Biochar: Process and Mechanisms)

Title载镧生物质炭吸附水体中As(Ⅴ)的过程与机制 (Adsorption of As(Ⅴ) from Aqueous Solution by Lanthanum Oxide-loaded Biochar: Process and Mechanisms)
Publication TypeMiscellaneous
Year of Publication2016
AuthorsYan-fang, FENG, Li-hong XUE, Bei Yang, Yang Liu, Jing-jing DUAN, Shi-ying HE, and Lin-zhang YANG
Abstract

将镧氧化物的纳米颗粒通过浸渍、负载、炭化等流程负载到以玉米秸秆为原材料制备的生物质炭(Biochar)表面,得到了对水体中As(Ⅴ)具有高效吸附性能的载镧生物炭(La-biochar).采用扫描电子显微镜(SEM)和X-射线电子能谱(XPS)对制备所得La-biochar进行了表征,研究了吸附剂用量、接触时间、初始pH值和初始As(Ⅴ)浓度等因素对吸附过程的影响,同时探讨了吸附机制.结果表明:La-biochar对As(Ⅴ)的去除效率随着吸附剂量的增加而增加,最优吸附剂投加量为2.0 g·L-1;La-biochar对As(Ⅴ)的吸附动力学过程数据遵循准二级吸附动力学方程,Langmuir吸附等温模型更适合描述La-biochar对As(Ⅴ)的吸附,并且吸附能力随着初始溶液pH值的增大而减小;La-biochar对As(Ⅴ)的吸附主要归结为复杂的离子交换过程.研究表明,La-biochar是一种高效的除砷吸附剂,具有一定的应用潜力. (The lanthanum oxide nanoparticles by dipping, load, load flow carbonization of biomass to charcoal (Biochar) of corn stalks as raw materials, surface preparation, has been carrying water lanthanum biochar As (Ⅴ) has a high adsorption properties (La-biochar). using scanning electron microscopy (SEM) and X- ray photoelectron spectroscopy (XPS) for the preparation of La-biochar obtained were characterized to study the adsorbent dosage, contact time, initial pH value and the initial As (Ⅴ ) concentration on the adsorption process, also discussed the results showed that the adsorption mechanism:. La-biochar for as (Ⅴ) removal efficiency increases the amount of adsorbent increases, the optimal adsorbent dosage 2.0 g · L-1; La-biochar for as (Ⅴ) adsorption kinetics data follow the pseudo-second adsorption kinetics equation, Langmuir isotherm model is more suitable to describe the adsorption La-biochar As (Ⅴ), and the adsorption capacity with the initial pH value increases and decreases; La-biochar for as (Ⅴ) adsorption mainly attributed to a complex ion exchange process studies show, La-biochar is a highly effective arsenic removal adsorbent, with some applications. potential.)

URLhttp://d.wanfangdata.com.cn/periodical/nyhjbh201511022
DOI10.11654/jaes.2015.11.022