以硅藻土为原料制备铯吸附剂及其吸附性能初探

doi:10.19964/j.issn.1006-4990.2020-0436

Abstract

Abstract:

Cesium is an extremely important rare alkali metal resource,which is widely used in the fields of optical fiber communication,catalysis,medical treatment and energy.There are considerable reserves of cesium in the salt lake brine in Qinghai,Tibet and other places to be developed.Therefore,it is of great significance to carry out research on the separation and extraction technology of cesium ions in solution.Non-toxic and inexpensive diatomite was used as the silicon source,triblock polymer P-123 was used as a template agent,and the one step synthesis method was used to synthesize AMP/SiO₂ composite adsorbent with ammonium molybdophosphate（AMP） loading of 27% used to adsorb cesium ion（Cs⁺）.The AMP/SiO₂ was characterized by scanning electron microscope（SEM）,X-ray diffraction（XRD）,fourier transform infrared spectro-meter（FT-IR） and other analytical instruments,and the adsorption properties of AMP/SiO₂ for Cs⁺ in aqueous solution were preliminary investigated.The results showed that AMP was uniformly dispersed in the structure and pores of mesoporous silica,and the composite had a large specific surface area（451.2 m²/g） and pore volume（0.95 cm³/g）.In addition,the adsorp-tion process of adsorbent for Cs⁺ was in accord with the pseudo-second-order kinetic model and Freundlich isotherm adsorp-tion model,and the equilibrium adsorption capacity was up to 63.45 mg/g.

Key words: diatomite, ammonium molybdophosphate, silica, cesium, adsorption

CLC Number:

TQ127.2

Dong Chaochao,Deng Xiaochuan,Wang Bin,Fan Faying,Zhu Chaoliang,Fan Jie,Qing Binju. Preparation of cesium adsorbent from diatomite and its adsorption properties[J]. Inorganic Chemicals Industry, 2021, 53(6): 134-139.

Figures/Tables 12

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Table 1

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References 26

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吸附模型	k	q_e/（mg·g^-1）	R²
拟一级动力学模型	k₁=-0.041 9	71.59	0.977 4
拟二级动力学模型	k₂=5.179×10^-4	76.92	0.991 2

T/℃	Langmuir			Freundlich
T/℃	q_m / （mg·g^-1）	K_L/ （L·mg^-1）	R²	K_F	n	R²
25	65.79	0.024	0.980 4	334.734	3.77	0.986 7

有效成分	载体材料	吸附容量/ （mg·g^-1）	w（AMP）/ %	参考文献
AMP	磷酸锆	7.70	—	[23]
	海藻酸钙	91.70	67	[13]
	聚丙烯腈	81.00	—	[24]
	氧化铝	12.00	10	[25]
	SBA-15	70.90	50	[20]
	二氧化硅	36.60	20	[15]
	片状SBA-15	70.00	50	[26]
	SiO₂	63.45	27	本研究

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Preparation of cesium adsorbent from diatomite and its adsorption properties

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