介孔形貌的LDH吸附磷酸盐的位点能量研究

doi:10.19964/j.issn.1006-4990.2023-0557

Abstract

Abstract:

Phosphorus pollution in water bodies is an urgent environmental problem，which threatens biological health and destroys ecological balance.In this paper，Mg-Al layered double hydrotalcites with CO₃^2- type stacking lamellae，CH₂CHCOO^- type intercalated rock⁃like，and CH₂CHCOO^- type recombined funnel⁃shaped and rock⁃like were prepared respectively by hydrothermal method.The interaction between different interlayer ions and hydrotalcite lamellae was studied by density functional theory.Through isothermal adsorption experiment and site energy distribution theory based on Toth model and DA model，the phosphate adsorption characteristics of hydrotalcites with different morphology and structure were analyzed.The experimental results showed that the adsorption sites of funnel⁃shaped hydrotalcite were distributed in high energy region，while the sites of the other two hydrotalcites were distributed in low energy region.With the increase of temperature，the site distribution of the three hydrotalcites shifted to the high energy region，and the average site energy was increased by 12.04% to 14.26%.Funnel⁃shaped hydrotalcite obtained by acrylic acid regulation had more high⁃energy adsorption sites，larger specific surface area and stronger ligand exchange.At the same time，with the increase of temperature and concentration，the energy distribution of funnel⁃shaped hydrotalcite sites changed most significantly，indicating that funnel⁃shaped hydrotalcite had advantages in phosphate adsorption.This study provided a theoretical basis for the regulation of mesoporous hydrotalcite and the study of phosphate adsorption mechanism of hydrotalcite through site energy distribution theory.

Key words: layered double hydrotalcite, morphological structure, adsorption, phosphate, site energy distribution

CLC Number:

SHI Hongyu, LÜ Qing, ZHANG Lijin, LI Qingxin, QIN Jun. Study on site energy of phosphate adsorption by layered double hydrotalcites with mesoporous morphologies[J]. Inorganic Chemicals Industry, 2024, 56(10): 38-46.

Figures/Tables 9

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样品	比表面积/ （m²·g^-1）	孔体积/ （m³·g^-1）	平均孔径/ nm
G-LDH	16.24	0.11	25.68
R-LDH	36.83	0.22	23.28
K-LDH	48.47	0.23	18.15
G-LDH*	28.70	0.20	26.12
R-LDH*	29.87	0.21	27.13
K-LDH*	62.75	0.32	19.58

样品	T/℃	位点能量分布范围/（kJ·mol^-1）	平均位点能量/（kJ·mol^-1）
G-LDH	25	16.86~21.55	18.94
	35	17.90~22.70	20.02
	45	19.00~24.01	21.22
R-LDH	25	16.94~21.91	19.09
	35	18.04~23.17	20.27
	45	19.16~24.44	21.45
K-LDH	25	17.65~29.99	21.95
	35	18.82~33.01	23.61
	45	19.96~35.30	25.08

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Study on site energy of phosphate adsorption by layered double hydrotalcites with mesoporous morphologies

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