改性硅藻土负载磷钼酸铵复合吸附剂的制备及其吸附Cs+研究

doi:10.19964/j.issn.1006-4990.2023-0033

Abstract

Abstract:

There are high concentrations of alkali metal elements in salt lake brine with similar properties to cesium ions，which makes the selective separation of cesium resources in salt lake brine very difficult.In this study，the surface of diatomite was modified by hydrothermal method with cheap and easily available diatomite as the matrix and aluminum chloride as the aluminum source.The prepared modified diatomite was calcined at 500 ℃ as the carrier material，and ammonium phosphomolybdate was loaded onto the surface of the carrier material by impregnation to prepare composite adsorbent.The prepared materials were characterized by X-ray diffraction，scanning electron microscopy and Fourier transform infrared spectroscopy.The adsorption and desorption properties of Cs⁺ were studied systematically.The results showed that the prepared adsorbent maintained high selectivity in the complex system，and the adsorption capacity reached 79.41 mg/g.The adsorption data were fitted by kinetic and adsorption isotherm models.The results showed that the adsorption process was more in line with the quasi-second-order kinetic model and Langmuir adsorption isotherm model.When 3 mol/L NH₄NO₃ was used as the desorption agent，the desorption rate was as high as 88.23%.After four adsorption-desorption cycle tests，the adsorption amount could remain at 74.38% of the initial adsorption amount.

Key words: diatomite, alumina, ammonium phosphomolybdate, Cs⁺, adsorption

CLC Number:

GUO Xueqin, DENG Xiaochuan, ZHU Chaoliang, FU Xin, WANG Ruirui, MA Wanxia, FAN Jie, ZUO Fangtao, QING Binju. Study on preparation of modified diatomite loaded ammonium phosphomolybdate composite adsorbent and its adsorption performance of Cs⁺[J]. Inorganic Chemicals Industry, 2023, 55(11): 19-26.

Figures/Tables 17

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样品	比表面积/ （m²·g^-1）	平均孔径/nm	孔体积/ （cm³·g^-1）
De	1.47	35.15	0.001 8
γ-AlOOH/De	24.26	13.65	0.088 9
γ-Al₂O₃/De	45.58	12.00	0.098 0
γ-Al₂O₃/De-AMP	108.39	13.76	0.109 1

吸附剂	准一级动力学模型				准二级动力学模型
吸附剂	Q_e/（mg·g^-1）	k₁	R²		Q_e/（mg·g^-1）	k₂	R²
γ-Al₂O₃/De-AMP	3.120	0.038 8	0.301 2		74.020	0.277 6	0.999 7

样品	Langmuir				Freundlich
样品	Q_m/（mg·g^-1）	K_L	R²		K_F	1/n	R²
γ-Al₂O₃/De-AMP	81.83	0.161	0.998 7		28.520 7	0.191 6	0.597 7

	C（Cs）/（mmol·L^-1）	C（NH₄⁺）/（mmol·L^-1）
吸附前	4.534 9	—
吸附后	2.778 7	1.683 9
吸附前后浓度差	1.756 2	-1.683 9

吸附剂	q_max/ （mg·g^-1）	吸附平衡时间	pH
NH₄PMA/SBA-15^［16］	70.9	—	—
AMP-SiO₂^［20］	18.13~81.36	—	—
SM-AMP20^［21］	37.63	4 h	—
APS-4^［15］	71.28	12 h	2~10
AMP-PA^［22］	4.7	5 h	5~10
50%AMP/P-SBA-15^［23］	45.1	30 min	2~9
MCC@AMP^［24］	9.49	45 min	2~12
AMP/SiO₂^［18］	63.45	2 h	4~11
AMP@MOF-76（Sm）^［25］	57.68	50 min	4~10
γ-Al₂O₃/De-AMP（本研究）	79.41	15 min	2~11

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Inorganic Acid-Base-Salt Committee of CIESC

Study on preparation of modified diatomite loaded ammonium phosphomolybdate composite adsorbent and its adsorption performance of Cs⁺

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Study on preparation of modified diatomite loaded ammonium phosphomolybdate composite adsorbent and its adsorption performance of Cs+