氯化银/聚醚砜复合膜原位合成及对溴离子的吸附研究

doi:10.19964/j.issn.1006-4990.2020-0627

Abstract

Abstract:

The composite materials adsorbed bromine ions in water were prepared.A certain amount of silver nitrate was added to polyethersulfone to make the casting solution,and AgCl-PES composite membranes were prepared by in-situ synthesis method.The structure of composite membrane materials were analyzed and studied by specific surface area measurement（BET）,scanning electron microscopy（SEM）,X-ray powder diffraction（XRD） and tensile property test.The effect of silver chloride content,adsorption time,adsorption temperature,initial pH of solution on removal of bromine ions was investigated through static adsorption method.Experimental results showed that the optimized condition for adsorption of bromine ions by the composite membrane were m（AgCl）/m（PES）=0.10,adsorption time of 7 h,adsorption temperature of 25 ℃,initial pH of solution of 9.The adsorption process of bromine ions on the composite membrane was accorded with the Langmuir linear adsorption isotherm and Pseudo-second-order kinetic models at 25 ℃.The maximum theoretical adsorption capacity of the composite membrane was 83.31 mg/g with m（AgCl）/m（PES） of 0.10.

Key words: silver chloride, bromine ion, composite membrane, in-situ synthesis, adsorption

CLC Number:

TQ131.22

Guan Ruoling,Sun Chang,Zhuo Xianqin. Study on in-situ synthesis of AgCl/PES composite membranes and their adsorption of bromine ions[J]. Inorganic Chemicals Industry, 2021, 53(9): 40-45.

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References 13

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复合膜	m（AgCl）/m（PES）	铸膜液组成及质量分数/%
复合膜	m（AgCl）/m（PES）	PES	DMAc	AgNO₃	AgCl
A0	0.00	14	86.00	0.00	0.00
A1	0.01	14	85.86	0.14	0.12
A2	0.05	14	85.30	0.70	0.59
A3	0.10	14	84.60	1.40	1.18
A4	0.50	14	79.00	7.00	5.91
A5	1.00	14	72.00	14.00	11.83

复合膜	m（AgCl）/m（PES）	S_BET/（m²·g^-1）
复合膜	m（AgCl）/m（PES）	吸附	脱附
A1	0.01	6.745	7.236
A3	0.10	6.935	7.477

T/℃	Langmuir			Freundlich
T/℃	q_m/（mg·g^-1）	K_L/（L·mg^-1）	R²	K_F/（mg^1-1/ⁿ·L^1/ⁿ·g^-1）	n	R²
25	83.31	0.020 8	0.986 8	5.756	2.068	0.980 4

准一级动力学模型			准二级动力学模型
K₁/min^-1	q_e/（mg·g^-1）	R²	K₂/（g·mg^-1·min^-1）	Q_e/（mg·g^-1）	R²
9.589	0.015 4	0.925	59.86	0.003 8	0.999

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Study on in-situ synthesis of AgCl/PES composite membranes and their adsorption of bromine ions

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