| 改性炭化谷壳负载纳米Fe3O4对含As(V)废水的吸附性能 |
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| 引用本文： | 邓贵友, 周航, 曹玮, 邱琼瑶, 杨文弢, 朱维, 辜娇峰, 彭佩钦, 廖柏寒. 改性炭化谷壳负载纳米Fe3O4对含As(V)废水的吸附性能[J]. 环境工程学报, 2016, 10(8): 4251-4258. doi: 10.12030/j.cjee.201502141 |
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| 作者姓名： | 邓贵友 周航 曹玮 邱琼瑶 杨文弢 朱维 辜娇峰 彭佩钦 廖柏寒 |
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| 作者单位： | 1.中南林业科技大学环境科学与工程学院, 长沙 410004 |
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| 基金项目： | 湖南省农业部/财政部专项（湘农业联2014-137-3） 农业部公益性行业科研专项（201503104） 国家自然科学基金资助项目（41201530） 湖南省重点学科建设项目（2006180） |
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| 摘 要： | 以谷壳为原料，通过600℃缺氧高温热解制备一种炭化谷壳（CRH-I），并利用CRH-I通过改性负载方法获得另一种新型的负载纳米Fe3O4的碱改性炭化谷壳（CRH-II）。经过对比表面积进行表征分析发现，CRH-II相较CRH-I的BET比表面积增大约30%，达到182 m2·g-1，微比表面积和微孔体积都扩大了6倍左右。FTIR分析结果表明，相比CRH-I，CRH-II分子间的羧基和酚羟基官能团有所增加，产生了芳构化反应和脂肪醚类物质。吸附实验表明，相对CRH-I而言，CRH-II对As（V）的吸附率明显提高。pH=2时，CRH-II对溶液中As（V）的吸附率达到98.3%；但是As的吸附率随着溶液pH值升高而逐渐降低，pH=11时下降最为明显，吸附率只有63.4%。CRH-II吸附反应满足准动力学二级方程，其相关系数为R2=0.999；在不同温度下，将CRH-II对As（V）的吸附验数据进行Langmuir方程和Freundlich等温方程拟合，结果更符合Langmuir方程；在25℃时，相关系数R2=0.985。解吸吸附实验证明，CRH-II依然具备良好的吸附性能，且再生吸附性能稳定。
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| 关 键 词： | 炭化谷壳 纳米Fe3O4 As(V) 吸附 |
| 收稿时间： | 2015-04-06 |
Adsorption characteristics of As(V) on modified carbonized rice husk loading nano Fe3O4 in wastewater |
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| DENG Guiyou, ZHOU Hang, CAO Wei, QIU Qiongyao, YANG Wentao, ZHU Wei, GU Jiaofeng, PENG Peiqin, LIAO Bohan. Adsorption characteristics of As(V) on modified carbonized rice husk loading nano Fe3O4 in wastewater[J]. Chinese Journal of Environmental Engineering, 2016, 10(8): 4251-4258. doi: 10.12030/j.cjee.201502141 |
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| Authors: | DENG Guiyou ZHOU Hang CAO Wei QIU Qiongyao YANG Wentao ZHU Wei GU Jiaofeng PENG Peiqin LIAO Bohan |
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| Affiliation: | 1.College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China |
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| Abstract: | Carbonized rice husk (CRH-I) was first prepared from the anoxic pyrolysis of rice husk at 600℃, and then modified with an alkali to form CRH-II and loaded onto Fe3O4 nanoparticles. The BET analysis of CRH-II compared to CRH-I revealed about 30% increase in the specific surface area to 182.03 m2·g-1 and a 6-fold expansion of the micro-surface area and microspore volume. FTIR analysis indicated that compared to CRH-I, the intermolecular carboxyl and phenolic hydroxyl groups were more numerous inside CRH-II, and that the aromatization effects were concurrently observed with the production of aliphatic ether substances. Adsorption experiments demonstrated enhanced adsorption ability for CRH-II over CRH-I, with 98.3% adsorption rate of As(V) on CRH-II in pH 2 wastewater. The adsorption rate of As(V) on CRH-II gradually decreased with increasing the solution pH; the minimum adsorption rate of 63.4% was observed at pH 11. The adsorption of As(V) onto CRH-II was modeled by using the dynamics equation of a quasi two-level system and correlation coefficient (R2) of 0.999. The experimental data of As(V) adsorption on CRH-II better conformed to the Langmuir isotherm equation (R2=0.985 at 25℃) than the Freundlich isotherm equation at different temperatures. Adsorption and desorption experiments indicated that CRH-II had good adsorption properties and a stable regenerative adsorption. |
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| Keywords: | carbonized rice husk nano Fe3O4 As (V) adsorption |
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