期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 610, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.colsurfa.2020.125736
关键词
Biochar; Phosphate; Adsorption; Mechanism
资金
- National Key Research and Development Program of China [2017YFD0800403]
- Natural Science Foundation of Tianjin [16JCYBJC29700]
- basic scientific research business of public welfare research institutes at the central level [C2112060302008086]
The La(OH)(3) nanomd/walnut shell biochar composite (LN-WB) effectively adsorbed phosphate over a wide pH range, with a removal efficiency close to 100% at an initial phosphorus concentration of 10 mg P/L. The adsorption process was mainly controlled by chemisorption, and the loading efficiency of La on WB was up to 73.89%.
A La(OH)(3) nanomd/walnut shell biochar composite (LN-WB) was successfully prepared by a parallel flow co-precipitating method and used to reclaim phosphate. LN-WB effectively adsorbed phosphate over a wide pH range (from 3 to 11) and when the initial phosphorus concentration was 10 mg P/L, the removal efficiency was close to 100 %. According to the Langmuir model, the adsorption capacity of LN-WB for phosphate was 75.08 mg P/g, corresponding to a molar ratio of P/La as high as 1.27. The adsorption process fit pseudo-second-order kinetics well and was mainly controlled by chemisorption. The loading efficiency of La on WB was up to 73.89 %. In initial solutions of pH = 3 and pH = 11, most of the La was retained on the biochar after phosphate adsorption. Characterization results indicated that the adsorption mechanism of phosphate on LN-WB was mainly electrostatic attraction, surface precipitation, and ligand exchange.
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