鸡蛋壳基多孔碳酸钙对刚果红吸附特性研究

doi:10.19964/j.issn.1006-4990.2021-0061

Abstract

Abstract:

By using waste egg shell as raw material and sodium dodecyl sulfate as template,porous calcium carbonate particles were prepared by template method,and their apparent morphology was analyzed by scanning electron microscope.Porous cal-cium carbonate particles were used to study the adsorption of Congo red,the optimal adsorption conditions were as follows：at room temperature,porous calcium carbonate content of 0.15 g,25 mL of Congo red solution with mass concentration of 300 mg/L,adsorption time of 7 h,and under this condition the adsorption rate was about 93%.The adsorption isothermal model and kine-tic model showed that the adsorption of porous calcium carbonate to Congo red belonged to monolayer adsorption,and the ad-sorption kinetics was in line with the quasi-second-order kinetics.Infrared spectrum analysis showed that the adsorption of Congo red by porous calcium carbonate was mainly physical adsorption.

Key words: egg shell, porous calcium carbonate, Congo red, adsorption characteristics

CLC Number:

TQ132.32

Chen Yanmeng,He Chunni,Pan Ting,Wang Yongshi,Meng Moji,Lan Junfeng. Study on adsorption characteristics of multi-pore calcium carbonate made from egg shell powder for Congo red[J]. Inorganic Chemicals Industry, 2021, 53(8): 91-95.

Figures/Tables 11

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Table 1

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References 19

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吸附模型	模型参数	温度/℃
吸附模型	模型参数	20	30	40
Langmuir	Q_max	21.46	23.87	27.32
	K_L	0.35	0.32	0.25
	R²	0.980	0.997	0.975
Freundlich	n	4.57	3.75	2.54
	K_F	9.30	8.73	7.42
	R²	0.385	0.803	0.795

吸附动力学模型	吸附动力学方程	k	C	R²
准一级动力学模型	ln（Q_e-Q_t）=-0.582 6t+1.662	0.582 6	1.662	0.866
准二级动力学模型	t/Q_t=0.044 8t+0.007 5	0.044 8	0.007 5	0.999

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on adsorption characteristics of multi-pore calcium carbonate made from egg shell powder for Congo red

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