Inorganic Chemicals Industry >
Preparation of cesium adsorbent from diatomite and its adsorption properties
Received date: 2020-09-25
Online published: 2021-07-08
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
Chaochao Dong , Xiaochuan Deng , Bin Wang , Faying Fan , Chaoliang Zhu , Jie Fan , Binju Qing . Preparation of cesium adsorbent from diatomite and its adsorption properties[J]. Inorganic Chemicals Industry, 2021 , 53(6) : 134 -139 . DOI: 10.19964/j.issn.1006-4990.2020-0436
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