| 施加牛粪熟肥对黄土吸附双酚A的影响 |
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| 引用本文： | 刘兰兰,蒋煜峰,石磊平,原陇苗,万建新,王刚,吴应琴.施加牛粪熟肥对黄土吸附双酚A的影响[J].环境科学研究,2019,32(6):1063-1073. |
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| 作者姓名： | 刘兰兰 蒋煜峰 石磊平 原陇苗 万建新 王刚 吴应琴 |
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| 作者单位： | 兰州交通大学环境与市政工程学院,甘肃 兰州,730070;中国科学院西北生态环境资源研究院,中国科学院油气资源研究重点实验室,甘肃 兰州 730000 |
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| 基金项目： | 国家自然科学基金项目（No.41363008，41772147）；兰州交通大学百名青年优秀人才培养计划基金项目 |
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| 摘 要： | 为研究施加腐熟牛粪对黄土吸附BPA（双酚A）的影响，采用批量平衡试验法，分析不同因素如黄土粒径、体系温度、初始ρ （BPA）、离子强度、pH等]对BPA在黄土及施加牛粪熟肥黄土上吸附量的影响.结果表明:BPA在黄土中的吸附均符合先快后慢并最终达到平衡的吸附规律，准二级动力学模型能较好地描述其吸附动力学过程.BPA在黄土与施加腐熟牛粪黄土上的解吸量远小于其吸附量，说明吸附-解吸过程中存在解吸滞后性.黄土与施加腐熟牛粪黄土对BPA的热力学吸附过程符合Freundlich等温吸附模型，并且吸附等温线符合L-型吸附等温模式，BPA的吸附吉布斯自由能（ΔGθ） < 0，焓变（ΔHθ） < 0，熵变（ΔSθ） < 0，表明该吸附属于混乱程度减小、可自发放热的吸附过程.影响因素分析结果显示，黄土对BPA的吸附量随其粒径的减小而增大，而不论是否施加腐熟牛粪，其对BPA的吸附量均随体系温度升高而减少，且随初始ρ （BPA）的增加而升高.此外，加入的阳离子（Ca2+、Mg2+）会与BPA形成竞争吸附，不论是黄土还是施加腐熟牛粪黄土，其对BPA的吸附量均随加入阳离子浓度的升高而降低.当pH为3~7时，黄土与施加腐熟牛粪黄土对BPA的吸附量随着pH的升高而增加，而pH为7~10时对BPA的吸附量变化较小，表明该范围内pH变化对黄土与施加腐熟牛粪黄土吸附BPA的影响不明显.研究显示，施加牛粪等腐熟肥可能导致BPA的吸附行为发生改变.
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| 关 键 词： | 黄土 腐熟牛粪 双酚A 吸附动力学 吸附热力学 影响因素 |
| 收稿时间： | 2018/7/4 0:00:00 |
| 修稿时间： | 2018/9/4 0:00:00 |
Effect of Decomposed Dairy Manure on Adsorption of BPA onto Loess Soil |
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| LIU Lanlan,JIANG Yufeng,SHI Leiping,YUAN Longmiao,WAN Jianxin,WANG Gang and WU Yingqin.Effect of Decomposed Dairy Manure on Adsorption of BPA onto Loess Soil[J].Research of Environmental Sciences,2019,32(6):1063-1073. |
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| Authors: | LIU Lanlan JIANG Yufeng SHI Leiping YUAN Longmiao WAN Jianxin WANG Gang and WU Yingqin |
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| Affiliation: | 1.Environmental & Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China2.Key Laboratory of Petroleum Resources Research, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China |
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| Abstract: | Batch experiments were conducted to investigate the effects of decomposed dairy manure on the adsorption of bisphenol A (BPA) onto loess soil. The influence factors, such as temperature, initial concentration, ionic strength, pH, were also investigated to analyze and explore the changes of BPA adsorption onto loess soil affected by adding decomposed dairy manure. The results showed that the adsorption rate of BPA onto loess soil was fast initially and then slowed down before reaching the adsorption equilibrium. The adsorption kinetics curves of the loess soil with or without presence of decomposed dairy manure were all fitted well with the Pseudo-second-order model. The amount of BPA desorption from loess soil with or without the presence of decomposed dairy manure was much smaller than the adsorbed BPA, showing the existence of hysteresis in the sorption-desorption processes. The thermodynamic adsorption conformed to the Freundlich adsorption isothermal model, and was consistent with the L-type adsorption isotherm. The adsorption free energy of BPA was all less than zero, such as gibbs free energy (ΔGθ), enthalpy (ΔHθ), and entropy (ΔSθ), which indicates that the adsorption was a spontaneous process and the degree of chaos was reduced. The adsorption capacity of BPA onto loess soil increased with the decrease of particle size. The adsorption of BPA onto loess soil with or without the presence of decomposed dairy manure decreased with increasing temperature. In addition, the cations competed with BPA for adsorption, and with the increase of ion strengths, the inhibitory effects of BPA onto loess soil with the presence of decomposed dairy manure were higher than that without decomposed dairy manure. When pH was between 3 and 7, the adsorption capacity of BPA increased with the increase of pH, and the adsorption capacity of BPA was small when pH was between 7 and 10, which means that the alkaline conditions had little effect on the adsorption of BPA onto loess soil. The results suggested that the adsorption behavior of BPA onto loess soil may be changed by decomposed manure. |
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| Keywords: | loess soil decomposed dairy manure bisphenol A (BPA) adsorption kinetics adsorption thermodynamics influence factors |
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