Study on preparation of high adsorption capacity membrane and its removal for acid black 10B

doi:10.19965/j.cnki.iwt.2021-0486

Abstract

Abstract:

The composite membrane with high adsorption capacity for acid black 10B was prepared by polyaluminum chloride and chitosan under certain conditions. The effects of polyaluminium chloride addition，solution pH and ionic strength during adsorption on the adsorption of acid black 10B by the prepared composite membrane were investigated，and the adsorption mechanism was discussed. The results showed that when the mass ratio of polyaluminium chloride to chitosan was 1∶78，the prepared composite membrane had better adsorption performance for acid black 10B. In the adsorption process，when the pH of the solution was controlled between 3?8，the adsorption performance of the composite membrane remained stable. Adding NaCl to enhance the ionic strength was conducive to the adsorption of acid black 10B by the composite membrane. Langmuir model could better describe the adsorption process of acid black 10B on composite membrane. The higher temperature was conducive to the increase of the adsorption capacity of the composite membrane，but the adsorption affinity and adsorption strength of the composite membrane for acid black 10B were higher at low temperature. When the temperature was 320 K and the solution pH was 3.0，according to the Langmuir model，the adsorption capacity of the membrane could reach 4 155.723 mg/g. The adsorption process was self-heat release，mainly chemical adsorption. The interaction between the composite membrane and acid black 10B molecule was dominant by dipole?dipole hydrogen bond.

Key words: adsorption, composite membrane, acid black 10B, ionic strength

摘要：

采用聚合氯化铝与壳聚糖在一定条件下制备了对酸性黑10B具有高吸附容量的复合膜。通过试验考察了聚合氯化铝添加量以及吸附过程中溶液pH、离子强度等对制备的复合膜吸附酸性黑10B效果的影响，并对吸附机理进行了探讨。结果表明：当聚合氯化铝与壳聚糖质量比为1∶78时，制备的复合膜对酸性黑10B有较好的吸附性能。吸附过程中，溶液pH在3~8之间时，复合膜吸附性能稳定；添加NaCl增强离子强度有利于复合膜对酸性黑10B的吸附；Langmuir模型能较好地描述复合膜对酸性黑10B的吸附过程；较高的温度有利于复合膜吸附容量的上升，但低温下复合膜对酸性黑10B的吸附亲和力及吸附强度更高。当温度为320 K，溶液pH为3.0时，根据Langmuir模型，膜的吸附容量可达4 155.723 mg/g，吸附过程为自发放热，以化学吸附为主。复合膜与酸性黑10B分子之间的相互作用以偶极?偶极氢键作用为主。

关键词: 吸附, 复合膜, 酸性黑10B, 离子强度

CLC Number:

X703

Zhijun ZHANG,Jiangcheng SHU,Zhixiang XIE,Yijue GAO. Study on preparation of high adsorption capacity membrane and its removal for acid black 10B[J]. Industrial Water Treatment, 2022, 42(3): 154-159.

张志军,束蒋成,谢智翔,高奕珏. 高吸附容量膜的制备及对酸性黑10B的去除研究[J]. 工业水处理, 2022, 42(3): 154-159.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2021-0486

https://www.iwt.cn/EN/Y2022/V42/I3/154

Figures/Tables 13

Fig. 1 Effect of PAC concentration on membrane adsorption capacity

Fig. 2 Effect of solution pH on adsorption

Fig. 3 Effect of ionic strength on adsorption

Fig. 4 Effect of ionic strength on UV?Vis spectra of filtrate

Fig. 5 Effect of concentration of composite membrane on adsorption

Fig. 6 Fitting results of Langmuir model

Fig. 7 Fitting results of Freundlich model

Table1 Summary of thermodynamic parameters of adsorption process

温度/K	q_max/（mg·g^-1）	b×10^-3/（L·mg^-1）	R_L	ΔG/（kJ·mol^-1）	ΔS/（J·mol^-1·K^-1）	ΔH/（kJ·mol^-1）
288	3 126.896	100.04	0.005 007	-11.030	-36.603 8	-21.571 6
298	3 354.320	50.94	0.009 786	-9.740	-39.701 2
320	4 155.723	33.69	0.014 227	-9.359	-38.162 6

Fig. 8 Elution test results

Fig. 9 Regeneration times and adsorption rate of composite membrane

Fig. 10 ATR?FTIR diagram of membrane

Fig. 11 The reaction between polyaluminum chloride and protonated chitosan

Fig. 12 Dipole?dipole hydrogen bonding of acid black 10B on composite membrane

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