磷钨酸铵复合材料对铷铯吸附性能的研究

Abstract

Abstract:

In order to solve the problem of rubidium and cesium enrichment in brine,a new adsorbent material,ammonium phosphotungstate-titanium pyrophosphate composite,was used for adsorbing rubidium ions and cesium ions,the new adsorbent material was prepared by ammonium phosphotungstate compounded with titanium pyrophosphate.The thermodynamics and kinetics of the adsorption process of rubidium and cesium ions on composites were studied.It found that the quasi-second-order kinetic equation and the Freundlich adsorption isotherm equation can fit the adsorption process well and the correlation was good through the kinetics and the thermodynamic study.It also found that ΔG ⁰、ΔH ⁰、ΔS ⁰ were all less than zero and the adsorption of rubidium and cesium on the composite adsorbent was spontaneously carried out.The adsorption of ruthenium and osmium by the composite adsorbent was an exothermic reaction.The increase of temperature was not conducive to the adsorption,and the chaos of the solid-liquid interface was reduced during the adsorption process,which was an entropy reduction process.

Key words: ammonium phosphotungstate-titanium pyrophosphate composite, adsorption thermodynamics and kinetics, rubidium, cesium

CLC Number:

Li Ying,Chen Xia,Miao Shulan,Liao Enxin. Study on adsorption properties of ammonium phosphate tungsten composites on rubidium and cesium[J]. Inorganic Chemicals Industry, 2019, 51(6): 34-37.

Figures/Tables 9

References 9

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动力学拟合方程	温度/ K	Rb		Cs
动力学拟合方程	温度/ K	方程	R²	方程	R²
准一级动力学方程	288	y=0.108 18x+ 0.110 67	0.974 57	y=0.170 15x+ 0.153 68	0.983 25
	298	y=0.109 31x+ 0.055 92	0.978 59	y=0.165 23x+ 0.073 36	0.975 53
	308	y=0.109 54x+ 0.051 09	0.983 20	y=0.164 90x- 0.005 26	0.923 20
准二级动力学方程	288	y=0.050 55x+ 0.340 44	0.994 42	y=0.075 20x+ 0.248 49	0.990 32
	298	y=0.045 44x+ 0.455 56	0.992 82	y=0.068 55x+ 0.400 49	0.990 91
	308	y=0.048 30x+ 0.413 04	0.992 74	y=0.068 70x+ 0.435 67	0.991 48

项目	温度/ K	Freundlich参数			Langmuir参数
项目	温度/ K	k_f	n	R²	k_L	Q_m	R²
吸附铷离子	288	1.181×10^-5	1.621 0	0.958 3	0.052 4	28.935 1	0.857 3
	298	1.180×10^-5	1.708 3	0.964 8	0.045 9	28.113 5	0.889 4
	308	7.961×10^-6	1.783 8	0.975 2	0.037 1	28.113 5	0.942 3
吸附铯离子	288	2.296 7	1.796 0	0.983 1	2.368 2	17.667 8	0.955 0
	298	1.327 1	1.450 7	0.988 1	0.898 1	23.640 7	0.975 1
	308	0.666 2	1.238 6	0.988 6	0.366 0	35.714 3	0.983 9

项目	T/K	ΔG⁰/ （kJ·mol^-1）	ΔH⁰/ （kJ·mol^-1）	ΔS⁰/ （J·mol^-1·k^-1）
吸附铷离子	288	-1.00	-13.73	-0.04
	298	-0.63
	308	-0.11
吸附铯离子	288	-8.94	-42.96	-0.12
	298	-7.57
	308	-6.58

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Study on adsorption properties of ammonium phosphate tungsten composites on rubidium and cesium

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