吸附
生物炭
傅里叶变换红外光谱
朗缪尔吸附模型
化学
磷
材料科学
化学工程
无机化学
物理化学
有机化学
热解
工程类
作者
Anyu Li,Hua Deng,Yuqing Wu,Chenghui Ye,Yanhong Jiang
出处
期刊:ACS omega
[American Chemical Society]
日期:2021-03-09
卷期号:6 (11): 7402-7412
被引量:22
标识
DOI:10.1021/acsomega.0c05674
摘要
Zn–Al layered bimetallic composites were prepared by ethanol strengthening and co-precipitation using banana straw as a raw material. A high-efficiency phosphorus adsorbent (ZnAl-LDO-BC) was obtained by calcination at a high temperature. The kinetics and thermodynamics of phosphorus adsorption on ZnAl-LDO-BC were then studied. The results showed that the adsorption process of ZnAl-LDO-BC corresponds with the pseudo-second-order (PSO) kinetic equation and the Langmuir model. The theoretical maximum adsorption capacity of ZnAl-LDO-BC is 111.11 mg/g (at 45 °C, 500 mg/L phosphorus initial concentration). The influence of anions on phosphorus adsorption decreased in strength in the following order: CO32– > SO42– > NO3–. Scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS), Fourier transform infrared (FTIR) spectroscopy, and X-ray diffraction (XRD) were used to characterize the adsorption of phosphorus on ZnAl-LDO-BC and showed that ZnAl-LDO-BC can efficiently adsorb phosphorus. The adsorption mechanism utilizes both O–H and C–H on the surface of ZnAl-LDO-BC for the adsorption of PO43–, forming Zn3(PO4)2·4H2O via complexation precipitation; additionally, biochar surface adsorption and interlayer adsorption are indispensable forms of phosphate adsorption. With the systematic study of phosphorus adsorption by ZnAl-LDO-BC, a novel green technology was developed for addressing phosphorus pollution.
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