Preparation and Adsorption Performance of Graphene Oxide/Attapulgite Composites

doi:10.19491/j.issn.1001-9278.2020.05.008

Abstract

Abstract:

Graphene oxide (GO)/attapulgite (AT) composites were prepared by a solution blending method. The effect of the mass ratio of GO/AT on the adsorption capacity of the composites was investigated, and the phase composition and microstructure of the composites were analyzed. The results indicated that the composites gained a maximum adsorption capacity when the mass ratio of GO/AT was 3/4, and their adsorption rate reached 93.06 %. The effects of adsorption time, the initial concentration of tetracycline hydrochloride, and the pH values on the removal of tetracycline hydrochloride from aqueous solution were further investigated, and the mechanism and process of tetracycline hydrochloride adsorption were explored. The adsorption behavior of the composites for tetracycline hydrochloride was found to comply with the Langmuir isothermal equation and quasi second?order kinetic model with apparent adsorption activation energy of 37.19 kJ/mol. This indicated that the adsorption behavior was dominated by electrostatic adsorption. Moreover, the adsorption process was determined as an endothermic, spontaneous and entropy increasing process in the temperature range of this study according to the important parameters of ΔH^O=7.77 kJ/mol, ΔG^O＜0 and ΔS^O=57.62 J/(mol·K).

Key words: attapulgite, graphene oxide, composite, adsorption performance

CLC Number:

TQ327

Jiaheng LIU, Dongqin WANG, Sheng HU, Weibing HU. Preparation and Adsorption Performance of Graphene Oxide/Attapulgite Composites[J]. China Plastics, 2020, 34(5): 45-51.

Figures/Tables 14

References 18

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样品编号	GO的质量/g	AT的质量/g	GO/AT的质量比
1^#	0.3	1.2	1/4
2^#	0.6	1.2	1/2
3^#	0.9	1.2	3/4
4^#	1.2	1.2	1/1
5^#	1.5	1.2	5/4
6^#	1.8	1.2	3/2

样品编号	GO的质量/g	AT的质量/g	GO/AT的质量比
1^#	0.3	1.2	1/4
2^#	0.6	1.2	1/2
3^#	0.9	1.2	3/4
4^#	1.2	1.2	1/1
5^#	1.5	1.2	5/4
6^#	1.8	1.2	3/2

温度/ K	准一级动力学方程			准二级动力学方程
温度/ K	K₁	R²	q_e(cal)	K₂	R²	q_e(cal)
298	0.057 85	0.910 00	160.19	0.000 233 8	0.991 29	166.15
308	0.068 84	0.766 36	178.41	0.000 354 6	0.982 99	188.08
318	0.080 12	0.912 34	198.15	0.000 601 9	0.981 44	211.71

温度/ K	准一级动力学方程			准二级动力学方程
温度/ K	K₁	R²	q_e(cal)	K₂	R²	q_e(cal)
298	0.057 85	0.910 00	160.19	0.000 233 8	0.991 29	166.15
308	0.068 84	0.766 36	178.41	0.000 354 6	0.982 99	188.08
318	0.080 12	0.912 34	198.15	0.000 601 9	0.981 44	211.71

T/K	Langmuir吸附等温式			Freundlich吸附等温式
T/K	K₁	R²	q_m	K_f	R²	1/n
298	0.044 313	0.993 91	203.33	51.511 20	0.918 98	0.257 95
308	0.049 423	0.994 72	221.92	51.718 82	0.930 36	0.272 77
318	0.053 969	0.985 54	248.52	51.042 62	0.917 41	0.295 79