壳聚糖基杂化气凝胶对活性染料的吸附性能

doi:10.13475/j.fzxb.20200800408

摘要/Abstract

摘要：

为有效去除印染废水中的活性染料,以壳聚糖高分子为骨架材料,甲壳素微晶作为偶联剂,多巴胺作为交联剂,原位生成的纳米二氧化钛为掺杂剂,通过溶液共混和冷冻干燥技术制备了壳聚糖/微晶/聚多巴胺/二氧化钛(CS/WSK/PDA/TiO₂)杂化气凝胶,并用于吸附活性红紫X-2R、活性红KE-3B和活性黄M-3BE。借助全反射红外光谱仪与扫描电子显微镜对所制备的壳聚糖基杂化气凝胶的结构进行表征,并对影响其吸附染料性能的条件进行探讨。结果表明:CS/WSK/PDA/TiO₂杂化气凝胶具有片层状,多孔结构,其中纳米二氧化钛负载于壳聚糖基杂化气凝胶的聚合物网络框架上;在30 ℃和中性条件下,CS/WSK/PDA/TiO₂杂化气凝胶对活性红紫X-2R、活性红KE-3B和活性黄M-3BE的吸附量可分别达到400.0、398.4、404.9 mg/g,且吸附动力学行为符合准二级动力学模型。

关键词: 壳聚糖, 气凝胶, 二氧化钛, 吸附, 活性染料, 废水处理

Abstract:

In order to effectively remove reactive dyes in textile dyeing wastewater,and hence to reduce the impact on water environment and human health hazards, achitosan based hybrid aerogel (CS/WSK/PDA/TiO₂) was prepared by solution blending and freeze-drying techniques, using chitosan(CS) polymer as the skeleton material, dopamine(WSK) as bio-adhesive agent, and chitin whisker(PDA) as cross-linking agent. The hybrid aerogel was used to absorb the Reactive Violet X-2R, Reactive Red KE-3B and Reactive Yellow M-3BE. The morphology and structure of the prepared chitosan hybrid aerogels were characterized by attenuated total reflection Fourier transform in frared spectroscopy and scanning electron microscope. The effects of different conditions on the adsorption performance of the hybrid aerogel were studied. The experimental results show that chitosan-based hybrid aerogels have lamellar, porous functional structure,and the nano titanium oxide is embedded in the chitosan based hybrid aerogel. When the adsorption conditions are set to 30 ℃ and neutral pH value,the adsorption capacity of CS/WSK/PDA/TiO₂ aerogels for Reactive Violet X-2R, Reactive Red KE-3B and Reactive Yellow M-3RE Reaches 400 mg/g, 398.4 mg/g, and 404.9 mg/g, respectively. The adsorption kinetic results are well described by the pseudo-second order kinetic.

Key words: chitosan, aerogel, titanium dioxide, adsorption, reactive dye, wastewater treatment

中图分类号:

TQ264.17

何雪梅, 冒海燕, 蔡露. 壳聚糖基杂化气凝胶对活性染料的吸附性能[J]. 纺织学报, 2021, 42(02): 148-155.

HE Xuemei, MAO Haiyan, CAI Lu. Adsorption performance of chitosan based hybrid aerogel on reactive dyes[J]. Journal of Textile Research, 2021, 42(02): 148-155.

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染料	准一级动力学模型		准二级动力学模型
染料	k₁/min^-1	R²	k₂/(min·g·mg^-1)	R²	Q_max/(mg·g^-1)
活性红紫X-2R	0.039 12	0.937 1	0.000 902	0.999 9	400.0
活性红KE-3B	0.022 70	0.976 5	0.000 122	0.996 9	398.4
活性黄M-3RE	0.044 73	0.982 2	0.000 438	0.998 5	404.9

染料	Langmuir
染料	K_L/(L ·mg^-1)	a_L	R²	K_F/(mg⁽ⁿ^-1)/ⁿ·L^1/ⁿ·g^-1)	1/n	R²
活性红紫X-2R	8.344	0.029 54	0.984 5	23.11	0.422 2	0.984 9
活性红KE-3B	4.080	0.018 65	0.980 4	16.6	0.406 0	0.996 7
活性黄M-3RE	4.578	0.016 48	0.964 2	17.2	0.441 1	0.993 9