十二烷基硫酸钠改性镁铝水滑石及对Pb2+的吸附性能研究

doi:10.19964/j.issn.1006-4990.2024-0631

Abstract

Abstract:

Magnesium-aluminum hydrotalcite（MgAl-LDH） was prepared by coprecipitation method using hydrochlorite as magnesium source and aluminum chloride hexahydrate as aluminum source.The layered bimetallic oxide（LDO） was obtained after roasting at high temperature.Sodium dodecyl sulfate（SDS） modified Mg-Al hydrotalcite（S-MgAl-LDH） was prepared by hydration reconstruction method.The microstructure of the materials was characterized by X-ray diffraction（XRD），Fourier transform infrared spectroscopy（FTIR），scanning electron microscopy（SEM） and N₂ adsorption and desorption.The adsorption properties of Pb²⁺ onto MgAl LDH and S-MgAl-LDH were studied with pH，time，temperature and initial concentration of the solution.The results showed that the adsorption performance of Mg-Al hydrotalc for Pb²⁺ was significantly improved after SDS modification.The maximum adsorption capacity of S-MgAl-LDH for Pb²⁺ at 328 K was 220.85 mg/g，and the adsorption parameters were consistent with the pseudo-second-order kinetics and Langmuir model，indicating that the adsorption process was single-layer adsorption and controlled by chemical action.The positive values of $∆ H ɵ$ and negative values of $∆ G ɵ$ indicated that the adsorption process was spontaneous and endothermic.The adsorption mechanism mainly included surface complexation，interlayer chelation，precipitation，and isomorphic substitution.This study opened up a new way for the development and high-value utilization of hydrochloromagnite，a by-product of potassium extraction，and showed the application potential of S-MgAl-LDH in heavy metal ion pollution.

Key words: SDS modification, bischofite, hydrotalcite, adsorption, Pb²⁺

CLC Number:

X703

HAN Xing, SHI Dandan, WANG Xingquan, ZHANG Tianying, CAO Yue, WANG Yiying, ZHU Xiang, XU Naicai. Study on Mg-Al hydrotalcite modified by sodium dodecyl sulfate and its adsorption performance for Pb²⁺[J]. Inorganic Chemicals Industry, 2025, 57(8): 48-57.

Figures/Tables 15

Fig.1

Fig.2

Fig.3

Table 1

Fig.4

Fig.5

Table 2

Fig.6

Table 3

Thermodynamic parameters of Pb2+ adsorption by S-MgAl-LDH"

吸附剂	T/k	$∆ G ɵ$ / （kJ·mol^-1）	$∆ H ɵ$ / （kJ·mol^-1）	$∆ S ɵ$ / （J·mol^-1·K^-1）	R²
S-MgAl- LDH	298	-0.946 7	20.373 1	71.227 2	0.972 4
	308	-1.423 1
	313	-1.817 8
	318	-2.417 1
	328	-3.000 1

Table 3

Fig.7

Table 4

Fig.8

Fig.9

Fig.10

Table 5

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吸附剂	q_e.exp/ （mg·g^-1）	准一级动力学模型			准二级动力学模型
吸附剂	q_e.exp/ （mg·g^-1）	q_e.cal/ （mg·g^-1）	K₁/ min^-1	R²	q_e.cal/ （mg·g^-1）	K₂/ （g·mg^-1·min^-1）	R²
MgAl-LDH	38.30	20.23	0.017 6	0.978 0	38.42	0.002 0	0.987 8
S-MgAl-LDH	108.25	81.45	0.015 3	0.941 9	108.70	0.000 5	0.964 5
吸附剂	颗粒内扩散模型
吸附剂	q_e.exp/（mg·g^-1）	K_i1/（mg·g^-1·min^-1）	C₁	K_i2/（mg·g^-1·min^-1）	C₂	K_i3/（mg·g^-1·min^-1）	C₃
MgAl-LDH	38.30	0.988 5	19.716 4	1.432 8	19.083 3	0.239 5	31.837 3
S-MgAl-LDH	108.25	7.418 0	15.058 2	7.926 0	10.280 4	0.120 1	108.250 0

吸附剂	pH	吸附容量/（mg·g^-1）
MgAl-LDHs/MnO₂^［28］	4.0	49.87
H-LDH^［29］	4.3	62.44
MgAl-GLDH^［30］	5.0	68.49
L-Cys/LDHs^［25］	6.0	81.24
ATMP/ZnAl-LDH^［31］	5.2	84.06
LDH-PEG4000^［32］	5.0	92.59
S-MgAl-LDH（本工作）	5.4	133.35

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Study on Mg-Al hydrotalcite modified by sodium dodecyl sulfate and its adsorption performance for Pb²⁺

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Study on Mg-Al hydrotalcite modified by sodium dodecyl sulfate and its adsorption performance for Pb2+