介孔硅酸钙吸附亚甲基蓝性能研究

doi:10.19964/j.issn.1006-4990.2021-0011

Abstract

Abstract:

The adsorption properties of methylene blue by mesoporous calcium silicate which prepared from alumina-extracted coal gangue were studied.The effect of methylene blue solution pH,adsorbent dosage,adsorption time and temperature on the adsorption capacity were investigated.The results indicated that mesoporous calcium silicate showed good adsorption proper-ties for methylene blue.Under the conditions of 298 K,pH of 11,the dosage of mesoporous calcium silicate of 0.2 g/L and ad-sorption time of 60 min,the removal rate of methylene blue could reach 87.33%.The adsorption process of methylene blue on mesoporous calcium silicate could be described by the pseudo second order kinetic model and Langmuir adsorption isotherm equation,indicating a monolayer adsorption process with the saturated adsorption capacity of 89.68 mg/g.The thermodynamic analysis showed that the adsorption process was a spontaneous,entropy increase process,and the higher temperature was conducive to the adsorption.The adsorption enthalpy was 62.72 kJ/mol.The adsorption of methylene blue by mesoporous calcium silicate was mainly chemical adsorption.

Key words: mesoporous calcium silicate, methylene blue, adsorption, coal gangue

CLC Number:

TQ132.32

Yang Quancheng,Zhang Kaiyong,Guo De,Shi Changsheng,Ma Ruixin,Tang Ligang,Du Zhenyu. Research on adsorption properties of methylene blue by mesoporous calcium silicate[J]. Inorganic Chemicals Industry, 2021, 53(10): 86-91.

Figures/Tables 13

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References 16

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吸附剂用量/ （g·L^-1）	q_e,exp/（mg·g^-1）	准一级动力学模型			准二级动力学模型
吸附剂用量/ （g·L^-1）	q_e,exp/（mg·g^-1）	q_e,calc/（mg·g^-1）	k₁/（min^-1）	R²	q_e,calc/（mg·g^-1）	k₂/ [g·（mg· min）^-1]	R²
尾渣-0.2	8.87	12.94	2.56	0.933 8	10.60	0.006 9	0.995 9
介孔-0.1	63.03	65.18	4.18	0.914 3	66.23	0.003 8	0.997 2
介孔-0.2	43.84	49.61	3.90	0.944 9	46.86	0.004 2	0.999 0
介孔-0.3	29.88	18.02	2.89	0.921 9	30.47	0.021 2	0.999 8

Langmuir模型			Freundlich模型
q_m/ （mg·g^-1）	k_L/ （L·mg^-1）	R²	k_F/ （mg·g^-1）	n	R²
89.68	0.75	0.989 6	37.58	2.84	0.957 4

T/K	C_e/（mg·L^-1）	q_e/（mg·g^-1）	K_C/（L·g^-1）	ln K_C
288.15	2.41	37.96	15.77	2.76
298.15	1.23	43.84	35.61	3.57
308.15	0.64	46.78	72.73	4.29
318.15	0.25	48.74	194.08	5.27

T/K	△G/（kJ·mol^-1）	△H/（kJ·mol^-1）	△S/（kJ·mol^-1）
288.15	-6.61	62.72	0.24
298.15	-8.86
308.15	-10.98
318.15	-13.94

次数	η/%	次数	η/%
0	87.33	3	84.32
1	86.51	4	83.24
2	85.43	5	82.18

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Research on adsorption properties of methylene blue by mesoporous calcium silicate

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