冻融循环对牦牛粪生物炭吸附氨氮的影响

汪艳如; 侯杰发; 郭建华; 黄兵; 罗专溪; 陈樑

文章摘要

汪艳如,侯杰发,郭建华,黄兵,罗专溪,陈樑.冻融循环对牦牛粪生物炭吸附氨氮的影响[J].农业环境科学学报,2017,36(3):566-573.

冻融循环对牦牛粪生物炭吸附氨氮的影响

Effects of freeze-thaw cycles on ammonium-nitrogen adsorption of yak dung biochar

投稿时间：2016-08-01

DOI：10.11654/jaes.2016-0994

中文关键词: 生物炭冻融循环氨氮等温吸附动力学吸附

英文关键词: biochar freeze-thaw cycles ammonium isotherm adsorption kinetics adsorption

基金项目:国家科技支撑计划（2011BAC09B04-03）；国家自然科学基金地区科学基金项目（41261079）

作者	单位	E-mail
汪艳如	昆明理工大学环境科学与工程学院, 昆明 650500 中国科学院城市环境研究所城市环境与健康重点实验室, 福建厦门 361021
侯杰发	昆明理工大学环境科学与工程学院, 昆明 650500 中国科学院城市环境研究所城市环境与健康重点实验室, 福建厦门 361021
郭建华	中国科学院城市环境研究所城市环境与健康重点实验室, 福建厦门 361021
黄兵	昆明理工大学环境科学与工程学院, 昆明 650500
罗专溪	中国科学院城市环境研究所城市环境与健康重点实验室, 福建厦门 361021	zxluo@iue.ac.cn
陈樑	昆明理工大学环境科学与工程学院, 昆明 650500

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中文摘要:

为了解冻融循环（模拟物理老化过程）对不同热解温度下的牦牛粪生物炭吸附氨氮的影响，通过吸附实验，考查牦牛粪生物炭老化前后对氨氮的吸附特性，并采用元素分析、扫描电镜、FTIR、BET-N2等方法分析牦牛粪生物炭的组成及表面结构特性，探讨冻融循环对牦牛粪生物炭吸附氨氮的影响机理。结果表明，牦牛粪生物炭老化前后对氨氮的吸附动力学模型符合准二级动力学，吸附等温模型较符合Freundlich模型。不同热解温度的牦牛粪生物炭对氨氮的吸附作用存在显著性差异，冻融循环作用对热解温度较高的牦牛粪生物炭影响较显著（C₀<20 mg·L^-1），氨氮初始浓度为5 mg·L^-1时，老化后的生物炭PBC₄₅₀和PBC600（热解温度分别为450℃和600℃）的吸附量比老化前分别显著提高13.1%、12.4%，去除效率分别为62.6%、55%。PBC₄₅₀和PBC600的阳离子交换量和比表面积比老化前显著增加，阳离子交换量分别增加9.1%和75.7%，pH值、Zeta电位显著降低，其中阳离子交换量和比表面积是影响牦牛粪生物炭吸附氨氮的主要因素。

英文摘要:

In order to understand the effects of freeze-thaw cycles on ammonium-nitrogen(AN) adsorption of yak dung biochar, adsorption batch experiments were conducted to investigate AN adsorption process of different yak dung biochars at different pyrolysis temperature and its freeze-thaw cycles counterparts. Then their physicochemical properties were characterized using elemental analysis, scanning electron microscopy, FTIR spectra, and BET-N₂ surface area(SSA) to explore the adsorption mechanism of AN by freeze-thaw cycles biochars. Results showed that the AN adsorption kinetics of yak dung biochars fitted the pseudo-second-order model, and AN adsorption isotherms were fitted the Freundlich model. There were significant differences in AN adsorption onto yak dung biochars at different pyrolysis temperature.More effective roles were observed to be played on AN adsorption by yak dung biochars at higher pyrolysis temperature by freeze-thaw cycle(C0<20 mg·L^-1). Ammonium adsorption onto of PBC₄₅₀ and PBC600(biochars with freeze-thaw cycles at 450℃ and 600℃, respectively) were remarkably increased 13.1%, 12.4%, and the AN removal rate were reached 62.6% and 55%(C0=5 mg·L^-1). After freeze-thaw cycles, the cation exchange capacity(CEC) and SSA of PBC₄₅₀ and PBC600 remarkably increased, the CEC increased 9.1% and 75.7%, while the pH and Zeta potential remarkably decreased. Herein, the CEC and SSA were the main influenced factors in the AN adsorption.

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