碳羟基磷灰石/钾长石复合材料对镍的吸附性能研究

doi:10.11962/1006-4990.2019-0187

Abstract

Abstract:

The carbonated hydroxyapatite/potash feldspar composite adsorbent（CHAK） used to remove heavy metal nickel in water were prepared by liquid method with potash feldspar as the raw material.The effects of the adsorbent amount,initial so-lution pH,adsorption time and initial concentration of Ni ²⁺ on the adsorbability were investigated by static adsorption test.In addition,kinetics and thermodynamic were used to explore the adsorption mechanism.Results showed that with the increase of CHAK,the removal rate of Ni ²⁺ was increased,while the adsorption capacity of Ni ²⁺ was decreased.The optimal adsorption effect was obtained with the pH of 6.The adsorption equilibrium obtained with the adsorption time of 10 h.The adsorption ability of CHAK to Ni ²⁺ increased with the initial mass concentration of Ni ²⁺ at 50~4 000 mg/L,and then it reached stabilized. The saturated adsorption capacity of the CHAK was 7.1 times than that of the raw material.The kinetic and thermodynamic fitting results showed that the pseudo second order kinetic model more fitting the adsorption process.ΔH>0,it showed that the adsorption of Ni ²⁺ on CHAK was an endothermic process and raising the temperature was benefit to the adsorption process,ΔG<0 indicated that the adsorption was a spontaneous process.

Key words: potassium feldspar, carbonated hydroxyapatite, adsorption, Ni ²⁺

CLC Number:

TQ131.13

Zhang Ting,Zhu Huixia,Han Cong,Sun Lina,Li Ling. Research on adsorption of Ni ²⁺ by carbonated hydroxyapatite/potash feldspar composite materials[J]. Inorganic Chemicals Industry, 2020, 52(2): 30-34.

Figures/Tables 11

References 16

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准一级动力学ln （Q_e-Q_t）			准二级动力学t/Q_t
Q_e/（mg·g^-1）	k₁/min^-1	R²	Q_e/（mg·g^-1）	k₂/min^-1	R²
2.17	0.274	0.886**	9.60	0.327	0.999**

温度 T/K	Langmuir方程			Freundlich方程
温度 T/K	Q_m / （mg·g^-1）	K_L/ （L·mg^-1）	R²	K_F / （mg·g^-1）	1/n	R²
298	47.259	0.004	0.979**	3.234	0.338	0.995**
308	60.314	0.004	0.949**	4.443	0.315	0.988**
318	66.401	0.004	0.942**	5.463	0.300	0.981**

Q_e/ （mg·g^-1）	ΔH/ （kJ·mol^-1）	ΔG/（kJ·mol^-1）			ΔS/（J·mol^-1·K^-1）
Q_e/ （mg·g^-1）	ΔH/ （kJ·mol^-1）	298 K	308 K	318 K	298 K	308 K	318 K
6	59.798	-7.329	-8.130	-8.812	225.258	220.545	215.755
8	55.538				210.963	206.714	202.358
10	52.225				199.846	195.958	191.940

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Research on adsorption of Ni ²⁺ by carbonated hydroxyapatite/potash feldspar composite materials

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