Controlled release of phosphorus using lanthanum-modified hydrochar synthesized from water treatment sludge: Adsorption behavior and immobilization mechanism

被引:12
|
作者
He, Liwenze [1 ]
Chen, Yu [2 ,3 ]
Sun, Fei [2 ]
Li, Yanjun [2 ]
Huang, Wen [2 ]
Yang, Shunsheng [1 ]
机构
[1] Southwest Jiaotong Univ, Sch Civil Engn, Chengdu 610031, Peoples R China
[2] Southwest Jiaotong Univ, Fac Geosci & Environm Engn, Chengdu 610031, Peoples R China
[3] Southwest Jiaotong Univ, Fac Geosci & Environm Engn, 999, Xian Rd, Chengdu 610031, Peoples R China
关键词
Water treatment sludge; Hydrothermal; Lanthanum; Phosphorus; Adsorption and immobilization; ENHANCED PHOSPHATE REMOVAL; MODIFIED BENTONITE; HIGHLY EFFICIENT; AQUEOUS-SOLUTION; WASTE-WATER; SURFACE WATERS; EQUILIBRIUM; ADSORBENT; SEDIMENT; KINETICS;
D O I
10.1016/j.jwpe.2022.103319
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
For the proper disposal of water treatment sludge, novel Lanthanum (La)-modified water treatment sludge composites were synthesized using simple one-step hydrothermal carbonization. The composite La-modified hydrochar (WTSLa170-3) prepared at 170 degrees C for 3 h exhibited a phosphate adsorption capacity of up to 72.69 mg/g. The pore volume, pore size and specific surface area of the prepared material significantly increased, and La loaded successfully, which improved the phosphate adsorption performance compared with that of raw sludge. The adsorption kinetics and isotherms fitiing results revealed that the adsorption process was in agreement with the Freundlich model and pseudo-second-order kinetic model, and was multimolecular layer chemisorption and insensitive to the coexisting anions. The thermodynamic parameters revealed that the adsorption process had an endothermic and spontaneous nature. The adsorption mechanism was through electrostatic attraction and ligand exchange to form an inner-sphere complex, which was explored by using zero point charge analysis, Fourier infrared spectroscopy (FTIR), X-ray diffractometry (XRD) and X-ray photoelectron spectroscopy (XPS). Adding La-modified hydrochar into sediment effectively inhibited the release of internal P in the sediment. The addition of this hydrochar promoted the transformation of active NH4Cl-P, Org-P and BD-P into the very stable HCl-P in the sediment, which also reduced the biologically available P content significantly. These results indicate that WTSLa170-3 can effectively adsorb and remove P in water and immobilize P in sediment, and provide a new way for the resource utilization of water treatment sludge.
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页数:14
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