氧化铈-二氧化硅介孔材料制备及对铜离子的吸附性能

doi:10.11962/1006-4990.2020-0049

Abstract

Abstract:

The CeO₂-SiO₂ mesoporous material adsorbent was prepared by co-precipitaion method and precipitation impregnation method.Adsorption behavior of CeO₂-SiO₂ for Cu ²⁺ ions in water was studied.The prepared material were characterized by XRD,SEM and BET etc.,and the effect of the conditions,such as pH of solution, initial concentration of metal ion in solution,adsorbent amount and adsorption time,on the adsorption property of CeO₂-SiO₂ was analyzed by static adsorption experiment.The results showed that the removal effect of CeO₂-SiO₂ mesoporous material prepared by co-precipitaion method for Cu²⁺ was better than precipitation impregnation method.The best adsorption efficiency of CeO₂-SiO₂ mesoporous material for Cu²⁺ was obtained at pH=7.0 and then the adsorption equilibrium was almost reached at 20 min.With the increasing of the initial concentration of Cu²⁺ in solution, the removal rate of Cu²⁺ decreased and the cumulative adsorption quantity of Cu²⁺ increased.The removal rate of Cu²⁺increased with the increasing of the adsorbent amount,and the removal rate of Cu²⁺ tended to be stable when the amount of CeO₂-SiO₂ adsorbent was 0.15 g/L.The adsorption property of CeO₂-SiO₂ adsorption for different metal ions was acording from big to small as follows：Cu²⁺,Fe²⁺ and Mn²⁺,which met the quasi second-order kinetic model.

Key words: CeO₂-SiO₂, mesoporous material, copper ion, adsorption property

CLC Number:

TQ133.3

Li Youfeng,Ao Kehou,Fan Leilei,Huang Zhigang. Preparation of CeO₂-SiO₂ mesoporous material and its adsorption property for copper ions[J]. Inorganic Chemicals Industry, 2020, 52(12): 34-39.

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样品	A/（m²·g^-1）	V/（cm³·g^-1）	d_p /nm
样品-Ⅰ	147.599 6	0.233 8	6.336
样品-Ⅱ	112.154 7	0.214 6	17.771

动力学模型		R²	k	Q_e
一级动力学模拟	Cu²⁺	0.406 2	0.015 90	8.95
二级动力学模拟	Cu²⁺	0.999 9	0.052 33	19.30
	Fe²⁺	0.997 6	0.054 83	18.20
	Mn²⁺	0.998 9	0.064 31	15.50

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Preparation of CeO₂-SiO₂ mesoporous material and its adsorption property for copper ions

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