| 改性芦苇生物炭对水中低浓度磷的吸附特征 |
| 摘要点击 4560 全文点击 2148 投稿时间：2015-08-13 修订日期：2016-12-30 |
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| 中文关键词 芦苇生物炭 氯化铁 改性 吸附 低浓度磷 |
| 英文关键词 modified reed biochar ferric chloride modification adsorption low concentration phosphorus |
| 作者 | 单位 | E-mail | | 唐登勇 | 南京信息工程大学大气环境与装备技术协同创新中心, 南京 210044
南京信息工程大学环境科学与工程学院, 南京 210044
江苏省大气环境监测与污染控制高技术重点实验室, 南京 210044 | tdynju@163.com | | 黄越 | 南京信息工程大学大气环境与装备技术协同创新中心, 南京 210044
南京信息工程大学环境科学与工程学院, 南京 210044
江苏省大气环境监测与污染控制高技术重点实验室, 南京 210044 | | | 胥瑞晨 | 南京信息工程大学环境科学与工程学院, 南京 210044
江苏省大气环境监测与污染控制高技术重点实验室, 南京 210044 | | | 胡洁丽 | 南京信息工程大学环境科学与工程学院, 南京 210044
江苏省大气环境监测与污染控制高技术重点实验室, 南京 210044 | | | 张聪 | 南京信息工程大学环境科学与工程学院, 南京 210044
江苏省大气环境监测与污染控制高技术重点实验室, 南京 210044 | |
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| 中文摘要 |
| 为吸附处理低浓度含磷废水和实现芦苇资源化利用,将湿地植物芦苇制备成生物炭,通过负载氯化铁进行改性,探究了改性芦苇生物炭对水体中磷的吸附特征.结果表明,改性后芦苇生物炭的含铁量为11.98 mg·g-1,是改性前的44.7倍;改性芦苇生物炭pHpzc为7.49,当溶液pH为7.0时,吸附效果最好;在磷溶液浓度为4.0 mg·L-1、温度为298K时,改性芦苇生物炭平衡吸附量为0.658 mg·g-1,是未改性生物炭吸附量的34.6倍.研究不同温度下的吸附等温线,Langmiur方程很好地拟合不同温度的吸附等温线,该吸附是单层吸附,温度升高有利于吸附.吸附热力学研究表明,ΔGθ<0、ΔHθ>0和ΔSθ>0,说明该吸附是自发、熵增的吸热过程.假二级方程很好地拟合改性芦苇生物炭吸附磷的动力学数据,初始吸附速率随初始浓度的增大而增大,该吸附主要受颗粒内扩散控制.该研究为改性芦苇生物炭用于污水处理厂和水体深度除磷提供基础数据. |
| 英文摘要 |
| In order to remove low concentration of phosphorus in wastewater and realize resource utilization of reed, reed biochar(RB) was prepared using reed and then modified by ferric chloride, and the adsorption behavior of low concentration phosphorus was investigated. The results showed that the iron content of modified reed biochar(MRB) was 11.98 mg·g-1, which was 44.7 times that of RB; pHpzc of the MRB was 7.49, and the adsorption effect was the best when the solution pH was 7.0; at the initial concentration of 4.0 mg·L-1 and temperature of 298K, the adsorption capacity of MRB was 0.658 mg·g-1, which was 34.6 times that of RB. The adsorption isotherms at different temperatures were well fitted to Langmiur equation, which indicated the adsorption was monolayer adsorption, and increasing temperature was favorable for adsorption. ΔGθ<0, ΔHθ>0 and ΔSθ>0 indicated that the adsorption was a spontaneous, entropy increasing and endothermic process. The kinetic experimental data of the adsorption fitted well to the pseudo-second-order equation, the initial adsorption rate increased with the increasing initial concentration of solution, and the adsorption was mainly controlled by intraparticle diffusion. The research will provide basic data for application of MRB in deep removal of low concentration phosphorus from sewage treatment plant and water body. |
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