生物炭
吸附
磷酸盐
化学
傅里叶变换红外光谱
朗缪尔吸附模型
零电荷点
离子交换
核化学
无机化学
化学工程
离子
热解
有机化学
工程类
作者
Lingyan Liu,Chunhong Zhang,Shuangrong Chen,Lan Ma,Yingmei Li,Yifeng Lu
出处
期刊:Chemosphere
[Elsevier]
日期:2022-01-01
卷期号:286: 131773-131773
被引量:26
标识
DOI:10.1016/j.chemosphere.2021.131773
摘要
La(OH)3-modified canna biochar (CBC-La) was prepared by a coprecipitation method (dipping method), and its phosphate adsorption characteristics were investigated. The results show that the pseudo-second-order kinetics and the Langmuir model can be used to describe the adsorption process with a high level of accuracy. Adsorption equilibrium could be reached at 8 h, at which point the maximum adsorption capacity was shown to be 37.37 mg/g. CBC-La has excellent phosphate adsorption capacity in the middle to low concentrations (≤50 mg/L), and its removal rate can exceed 99 %. CBC-La also has wide pH adaptability (3–9) and a strongly selective adsorption performance. Notably, it can still maintain a removal rate of over 99.8 % in the presence of certain anions (NO3−, HCO3−, and CO32−), and the presence of NH4+ has a synergistic effect on the adsorption process. Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) measurements demonstrate that the main mechanisms of CBC-La phosphate adsorption are electrostatic adsorption, ion exchange, ligand exchange and inner sphere complexation.
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