磁性二氧化硅/壳聚糖复合气凝胶的制备及其对铜离子的吸附研究

doi:10.19964/j.issn.1006-4990.2022-0507

Abstract

Abstract:

Fe₃O₄ was prepared by co-precipitation method，and SiO₂ was wrapped on the surface of Fe₃O₄ by modified stober method to prepare magnetic SiO₂，and then the magnetic SiO₂/chitosan composite aerogel was prepared.The structure of composite aerogel was characterized by scanning electron microscopy（SEM），X-ray diffraction（XRD），specific surface area testing（BET），and Fourier transform infrared spectrometer（FT-IR），and the results showed that the specific surface area of composite aerogel was 24.93 m²/g，the average pore diameter was 19.02 nm，and the composite aerogel was a mesoporous material，it was favorable for the adsorption of Cu²⁺.The effects of the pH value，the dosage of composite aerogel and the initial concentration of Cu²⁺ on the adsorption performance were investigated.When the pH value was 6.0，the dosage of composite aerogel was 50 mg，the initial concentration of Cu²⁺ was 10 mg/L，the adsorption rate of composite aerogel for Cu²⁺reached 98.99 %，and was still relatively high after recycling for 4 times.The adsorption process of Cu²⁺ was followed the Langmuir adsorption isotherm model and the pseudo-secondary-order kinetic model，and it was an entropy-increasing and endothermic spontaneous chemisorption process.

Key words: magnetic, adsorption, silica, chitosan, composite aerogel

CLC Number:

TQ127.2

FU Minglian, CEN Jianmei, CHEN Zhangxu. Study on preparation of magnetic SiO₂/chitosan composite aerogel and its adsorption for Cu²⁺[J]. Inorganic Chemicals Industry, 2023, 55(6): 70-77.

Figures/Tables 15

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Table 1

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Langmuir常数				Freundich常数
Q_m/（mg·g^-1）	K_L/（L·mg^-1）	R²		1/n	K_F	R²
52.94	1.813 5	0.999 7		0.131 5	36.59	0.917 8

T/K	△G/（kJ·mol^-1）	△H/（kJ·mol^-1）	△S/（J·mol^-1·K^-1）
303	-11.540 7	40.436 8	171.542 8
308	-12.398 4
313	-13.256 1
318	-14.113 8
323	-14.971 5

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Study on preparation of magnetic SiO₂/chitosan composite aerogel and its adsorption for Cu²⁺

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