改性高岭土对工业氯化钙中Cu2+和Pb2+的吸附去除研究

doi:10.3969/j.issn.1001-1803.2022.08.004

Abstract

Abstract:

Kaolin was modified by calcination combined with sodium hydroxide treatment. The changes in physicochemical properties of kaolinite before and after modification were analyzed by FT-IR, XRD, XRF and other characterization methods. On this basis, the adsorption removal of Cu²⁺ and Pb²⁺ from calcium chloride solution by modified kaolinite was investigated. The effects of adsorption time, pH of calcium chloride solution and adsorbent dosage on the adsorption removal of Cu²⁺ and Pb²⁺ from calcium chloride solution by kaolinite and modified kaolinite were discussed. The adsorption kinetics and isothermal adsorption process behavior of modified kaolinite were analyzed for the adsorption removal of Cu²⁺ and Pb²⁺ in calcium chloride solution. It was found that the modification caused an amorphous transformation of kaolinite and the increase of electronegativity, specific surface area and pore volume. The average adsorption capacity of Cu²⁺ and Pb²⁺ in calcium chloride solution by modified kaolin was 3.57 and 3.17 mg/g higher than that without modification in the range of adsorption time from 40 to 120 min. The adsorption capacity was first increased and then to equilibrium with the increase of adsorption time. The adsorption capacity of Cu²⁺ in calcium chloride solution was first increased and then decreased with the increase of solution pH, while the adsorption capacity of Pb²⁺ was increased with the increase of solution pH. The adsorption capacities of Cu²⁺ and Pb²⁺ from calcium chloride solution were decreased with the increase of adsorbent dosage. The adsorption processes of modified kaolin for Cu²⁺ and Pb²⁺ were consistent with the pseudo second order kinetic equation and Langmuir isothermal adsorption model.

Key words: kaolin, calcium chloride, adsorption capacity, modification

CLC Number:

TQ424

Wang Haobo,Yi Yun,Fu Chengbing,Liu Fei,Cao Jianxin,Pan Hongyan. Adsorption removal of Cu²⁺ and Pb²⁺ from industrial calcium chloride by modified kaolin[J].China Surfactant Detergent & Cosmetics, 2022, 52(8): 819-826.

Figures/Tables 14

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References 20

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化学成分	w/%
化学成分	SiO₂	Al₂O₃	K₂O	Fe₂O₃	Na₂O	CaO	MgO
KLT	81.119	13.321	3.483	0.847	0.75	0.151	0.103
950NK	79.2	14.32	3.064	0.882	1.975	0.189	0.155

样品	比表面积/（m²/g）	孔容/（cm³/g）
KLT	2.247	0.011 6
950NK	9.053	0.020 9

重金属离子	拟一级动力学方程			拟二级动力学方程
重金属离子	k₁/（1/min）	q_m/（mg/g）	R²	k₂/（g/（mg·min））	q_m/（mg/g）	R²
Cu²⁺	0.041 7	5.78	0.992	9.71×10^-3	6.53	0.997
Pb²⁺	0.040 6	2.32	0.995	0.023 9	2.63	0.997

重金属离子	Langmuir等温吸附模型			Freundlich等温吸附模型
重金属离子	q_m/（mg/g）	K_L/（L/min）	R²	n	K_F/（mg/g）	R²
Cu²⁺	7.407	0.116	0.998	2.186	1.263	0.956
Pb²⁺	2.439	0.628	0.983	2.516	0.859	0.731

Adsorption removal of Cu²⁺ and Pb²⁺ from industrial calcium chloride by modified kaolin

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Adsorption removal of Cu2+ and Pb2+ from industrial calcium chloride by modified kaolin

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Adsorption removal of Cu²⁺ and Pb²⁺ from industrial calcium chloride by modified kaolin