| 冯彦房,薛利红,杨梖,刘杨,段婧婧,何世颖,杨林章.载镧生物质炭吸附水体中As(Ⅴ)的过程与机制[J].农业环境科学学报,2015,34(11):2190-2197. |
| 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 |
| 投稿时间：2015-06-05 |
| DOI：10.11654/jaes.2015.11.022 |
| 中文关键词: 稀土镧 生物质炭负载 五价砷 吸附 |
| 英文关键词: lanthanum biochar As(Ⅴ) adsorption |
| 基金项目:国家自然科学基金青年基金(41401345);江苏省农业自主创新基金(CX(14)2050);土壤与农业可持续发展国家重点实验室开放课题(Y412201428);江苏省自然科学基金(BK20140755) |
| 作者 | 单位 | E-mail | | 冯彦房 | 江苏省农业科学院农业资源与环境研究所, 农业部长江下游平原农业环境重点实验室, 南京 210014
中国科学院南京土壤研究所, 土壤与农业可持续发展国家重点实验室, 南京 210008 | | | 薛利红 | 江苏省农业科学院农业资源与环境研究所, 农业部长江下游平原农业环境重点实验室, 南京 210014 | | | 杨梖 | 江苏省农业科学院农业资源与环境研究所, 农业部长江下游平原农业环境重点实验室, 南京 210014 | | | 刘杨 | 中国科学院南京土壤研究所, 土壤与农业可持续发展国家重点实验室, 南京 210008
江苏省农业科学院农业经济与信息研究所, 南京 210014 | | | 段婧婧 | 江苏省农业科学院农业资源与环境研究所, 农业部长江下游平原农业环境重点实验室, 南京 210014 | | | 何世颖 | 江苏省农业科学院农业资源与环境研究所, 农业部长江下游平原农业环境重点实验室, 南京 210014 | | | 杨林章 | 江苏省农业科学院农业资源与环境研究所, 农业部长江下游平原农业环境重点实验室, 南京 210014
中国科学院南京土壤研究所, 土壤与农业可持续发展国家重点实验室, 南京 210008 | Lzyang@issas.ac.cn |
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| 中文摘要: |
| 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. |
| 英文摘要: |
| In this study, a lanthanum(La)-loaded biochar was prepared by impregnating, loading, and carbonizing La oxide nanoparticles with biochar derived from corn stalk and was used to study its removal of As(Ⅴ) from aqueous solutions. The prepared La-biochar was characterized by scanning electron microscopy(SEM) and X-ray photoelectron spectra(XPS). The effects on As(Ⅴ) adsorption by various factors, including adsorbent rate, contact time, solution pH, and initial As(Ⅴ) concentrations, were investigated. The removal efficiency of As(Ⅴ) increased with increasing La-biochar rates. The maximum adsorption was attained when the adsorbent rate was 2.0 g·L-1. However, the removal efficiency decreased as the solution pH increased. The adsorption isotherm of As(Ⅴ) on La-biochar was well described by Langmuir adsorption model and Freundlich adsorption isotherm, with better fitting by Langmuir model. The maximum adsorption capacity estimated by the Langmuir model was 38.02 mg·g-1, which was higher than the previous reported adsorption amount for biochars. This La-biochar adsorbed As(Ⅴ) very fast, with the adsorption being equilibrated within 60~90 min. The kinetics of As(Ⅴ) adsorption followed the pseudo-second-order kinetic model. Moreover, intraparticle diffusion model showed that diffusion was present between particles during adsorption process. The dominant adsorption mechanism might be complicated ion exchange. The results indicate La-biochar would be a promising adsorbent that can be utilized in purifying As(Ⅴ)-contaminated water. |
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