室温制备铁基有机金属框架吸附三价砷的研究

doi:10.19964/j.issn.1006-4990.2023-0221

Abstract

Abstract:

Arsenic pollution of groundwater is becoming increasingly serious，and drinking high-arsenic groundwater will seriously endanger human health.Therefore，it is of great significance to efficiently remove arsenic from water.The iron-based metal-organic framework MIL-88A was synthesized at room temperature for adsorbing As（Ⅲ） from water.MIL-88A was characterized by XRD，SEM，XPS and FT-IR.The kinetics and thermodynamics parameters of MIL-88A adsorbing As（Ⅲ） were studied.The experimental results showed that MIL-88A could efficiently adsorb As（Ⅲ） from water with the maximum adsorption capacity up to 286.37 mg/g，which was higher than that of similar adsorbents.The adsorption kinetic and isotherm data of MIL-88A were corresponded to pseudo-second-order kinetics model and Freundlich model，respectively，indicating that the adsorption process of MIL-88A to As（Ⅲ） was a combination of chemical adsorption and multi-layer adsorption.Combining with the characterization analysis，it was concluded that the carboxyl groups on the surface of MIL-88A could oxidatively adsorb As（Ⅲ） and oxidated to generate As（V），and As（V） adsorbed on the surface of the material could further adsorb As（Ⅲ） through hydrogen bonds，forming a multi-layer adsorption.This paper provided a theoretical reference for the efficient removal of As（Ⅲ） from water.

Key words: arsenic removal, aqueous solution, MOFs, MIL-88A

CLC Number:

X703

HE Yipeng, XIONG Chenxi, WANG Yiping, LI Jun, JIN Yang. Research on preparation of iron-based organic metal-organic framework at room temperature for adsorption of trivalent arsenic[J]. Inorganic Chemicals Industry, 2024, 56(2): 111-120.

Figures/Tables 16

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ρ₀/ （mg·L^-1）	准一级动力学			准二级动力学			实验值 Q_e/（mg·g^-1）
ρ₀/ （mg·L^-1）	Q_e1/（mg·g^-1）	k₁/（min^-1）	R²	Q_e2/（mg·g^-1）	k₂/（g·mg^-1·min^-1）	R²	实验值 Q_e/（mg·g^-1）
50	13.373	0.011 1	0.884 2	45.086	0.004 2	0.999 4	44.822
100	21.782	0.012 3	0.847 5	99.407	0.003 2	0.999 8	99.137
150	38.539	0.011 2	0.871 7	144.300	0.001 4	0.999 4	143.494
200	25.475	0.011 4	0.731 2	200.000	0.002 5	0.999 8	199.413
300	45.851	0.017 2	0.670 3	286.533	0.003 5	0.999 8	286.368

T/K	Langmuir 模型				Freundlich模型
T/K	Q_m/ （10³ mg·g^-1）	K_L/ （L·g^-1）	R²		K_F/（mg^1-1/ⁿ · L^1/ⁿ ·g^-1）	1/n	R²
288.15	-1.446	-0.001 1		0.333 4	0.990 1	1.126 9	0.988 0
298.15	-3.508	-0.000 4		0.165 9	1.193 0	1.056 4	0.993 4
308.15	-1.164	-0.001 1		0.641 8	0.832 7	1.122 9	0.996 6

吸附剂	最大吸附量/（mg·g^-1）	pH
Fe₃O₄@MIL-101（Cr）^［14］	121.5	7
UiO-66^［15］	205	9
Fe₃O₄@ZIF-8^［16］	100	8
ZIF-L^［23］	43.74	10
MnO₂@ZIF-8^［24］	140.27	7
MIL-88A（Fe）（本研究）	286.37	11

ρ₀ / （mg·L^-1）	ΔH/ （kJ·mol^-1）	ΔS/ （J·mol^-1）	ΔG/（kJ·mol^-1）
ρ₀ / （mg·L^-1）	ΔH/ （kJ·mol^-1）	ΔS/ （J·mol^-1）	288 K	298 K	308 K
50	-4.771 1	-13.492 8	-0.856 1	-0.806 4	-0.582 3
100	-8.101 4	-23.298 1	-1.385 5	-1.160 6	-0.919 1
150	-9.011 4	-26.381 2	-1.439 7	-1.081 5	-0.916 4
200	-9.882 6	-29.086 5	-1.503 8	-1.205 0	-0.922 5
300	-9.031 7	-26.680 5	-1.361 1	-1.039 5	-0.830 0

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Research on preparation of iron-based organic metal-organic framework at room temperature for adsorption of trivalent arsenic

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