Ca基LDO复合材料的制备及其对磷酸盐的吸附性能研究

doi:10.19964/j.issn.1006-4990.2023-0471

Abstract

Abstract:

The release of untreated excess phosphate into the water system will lead to very serious environmental problems.In order to remove excessive phosphate in water，the raw materials of solid waste flue gas desulfurization gypsum and Mg-Al hydrotalcite were mixed according to the initial molar ratio，and then a high⁃efficiency phosphorus removal adsorbent was prepared by hydrothermal synthesis and roasting，and characterized by XRD，FT-IR，SEM，BET and TGA.Taking phosphate as the target pollutant，the effects of adsorbent dosage，time，initial concentration，temperature，pH value of initial solution and coexisting ions on adsorption capacity and cyclic adsorption capacity of adsorbent were investigated.The results showed that Freundlich adsorption isotherm and pseudo⁃second⁃order kinetic equation could describe the adsorption process of phosphate well.Under the conditions of 25 ℃，pH=12 and adsorbent dosage of 10 mg，the adsorption capacity could reach 209.02 mg/g，and the adsorption behavior was relatively stable in the pH range of 4~11.The adsorption mechanism included internal diffusion，ligand exchange and precipitation reaction.This work not only provided a method for effectively utilizing solid waste to prepare adsorbent，but also provided theoretical significance for controlling eutrophication of water body and realizing waste recycling.

Key words: flue gas desulfurization gypsum, hydrotalcite, phosphate, adsorption, resource utilization, layered metal oxide

CLC Number:

TQ126.3

ZHANG Lijin, LÜ Qing, CHEN Xiaolang, LI Qingxin, SHI Hongyu, QIN Jun. Preparation of Ca-based LDO composite material and its adsorption performance for phosphate[J]. Inorganic Chemicals Industry, 2024, 56(7): 37-45.

Figures/Tables 16

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吸附剂	T/K	Freundlich吸附等温线			Langmuir吸附等温线
吸附剂	T/K	1/n	K_F/ ［（mg·g^-1）·（L·mg^-1）^1/ⁿ ］	R²	Q_m/ （mg·L^-1）	K_L/ （L·mg^-1）	R²
MAF-500	298	0.089	97.866	0.997	141.101	9.077	0.721
	308	0.057	123.523	0.950	161.755	1.118	0.326
	318	0.049	139.536	0.945	175.038	2.028	0.467

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Preparation of Ca-based LDO composite material and its adsorption performance for phosphate

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