零价铁/氧化石墨烯复合吸附剂对染料和重金属的吸附性能

doi:10.13475/j.fzxb.20210603311

纺织学报 ›› 2022, Vol. 43 ›› Issue (09): 156-166.doi: 10.13475/j.fzxb.20210603311

零价铁/氧化石墨烯复合吸附剂对染料和重金属的吸附性能

王双双, 季志浩, 盛国栋, 金恩琪()

绍兴文理学院浙江省清洁染整技术研究重点实验室, 浙江绍兴 312000

收稿日期:2021-06-10 修回日期:2022-06-20 出版日期:2022-09-15 发布日期:2022-09-26
通讯作者: 金恩琪
作者简介:王双双(1996—),女,硕士生。主要研究方向为纺织印染废水处理技术。
基金资助:
国家自然科学基金面上项目(21777102);浙江省清洁染整技术研究重点实验室开放基金项目(QJRZ1902);浙江省公益技术研究计划项目(LGG21E030005);浙江省公益技术研究计划项目(LGG22E030002)

Dye and heavy metal adsorption performance of zero-valent iron/graphene oxide blend absorbent

WANG Shuangshuang, JI Zhihao, SHENG Guodong, JIN Enqi()

Key Laboratory of Clean Dyeing and Finishing Technology of Zhejiang Province, Shaoxing University, Shaoxing, Zhejiang 312000, China

Received:2021-06-10 Revised:2022-06-20 Published:2022-09-15 Online:2022-09-26
Contact: JIN Enqi

摘要/Abstract

摘要：

针对目前酸性染料染色废水中染料和重金属Cr(Ⅵ)引起的严重环境污染问题,以零价铁(Fe⁰)/氧化石墨烯(GO)复合物作为吸附剂,以分别含有弱酸性蓝AS和Cr(Ⅵ)的水溶液模拟染色废水,探究Fe⁰与GO的质量比、溶液pH值及染料与Cr(Ⅵ)的初始质量浓度对吸附性能的影响,考察Fe⁰/GO吸附剂对酸性染料与Cr(Ⅵ)的吸附机制,研究其吸附热力学与动力学。结果表明:Fe⁰与GO吸附剂在质量比为4∶1时具有最佳吸附效果,弱酸性蓝AS染液初始质量浓度为75 mg/L,温度为30 ℃,pH值为4.0时,12 h后去除率为85.6%,最大吸附量达到85.6 mg/g;Cr(Ⅵ)溶液初始质量浓度为75 mg/L,温度为30 ℃,pH值为3.0时,12 h后去除率为95.8%,最大吸附量达到95.8 mg/g;Fe⁰/GO对2种污染物的吸附过程均符合Langmuir模型和准二级动力学模型。

关键词: 氧化石墨烯, 零价铁, 吸附性能, 六价铬离子, 酸性染料, 印染废水

Abstract:

In order to combat the serious pollution caused by dyes and heavy metal Cr(Ⅵ) in acid dye, zero-valent iron (Fe⁰)/graphene oxide (GO) compound was used as an adsorbent. The aqueous solutions containing Weak Acid Blue AS dye and heavy metal Cr(Ⅵ), respectively, were employed to simulate dye wastewater. The effects of the mass ratio of Fe⁰ and GO, the pH value of solution, and the initial mass concentration of dye and Cr(Ⅵ) on the adsorption performance were analyzed. The adsorption mechanism of Fe⁰/GO blend adsorbent for acid dye and Cr(Ⅵ) was investigated, and the adsorption thermodynamics and kinetics were studied. The results show that Fe⁰/GO blend adsorbent has the best adsorption capacity when the weight ratio is 4∶1. When the initial concentration of dye wastewater is 75 mg/L at 30 ℃ and pH is 4.0, the removal percentage is 85.6% after 12 h, and the maximum adsorption capacity reaches 85.6 mg/g. When the initial concentration of Cr(Ⅵ) is 75 mg/L at 30 ℃ and pH is 3.0, the removal percentage reaches 95.8% after 12 h, and the maximum adsorption capacity reaches 95.8 mg/g. The adsorption processes to both acid dye and Cr(Ⅵ) were both in accordance with the Langmuir model and the pseudo-second-order kinetic model.

Key words: graphene oxide, zero-valent iron, adsorption performance, Cr(VI), acid dye, dye wastewater

中图分类号:

TS199

王双双, 季志浩, 盛国栋, 金恩琪. 零价铁/氧化石墨烯复合吸附剂对染料和重金属的吸附性能[J]. 纺织学报, 2022, 43(09): 156-166.

WANG Shuangshuang, JI Zhihao, SHENG Guodong, JIN Enqi. Dye and heavy metal adsorption performance of zero-valent iron/graphene oxide blend absorbent[J]. Journal of Textile Research, 2022, 43(09): 156-166.

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m(Fe⁰)∶m(GO)	弱酸性蓝AS去除率/%	Cr(Ⅵ)去除率/%
8∶1	76.9	9.8
4∶1	87.4	23.5
1∶1	84.7	18.8
1∶4	84.1	10.6
1∶2	77.9	7.3
纯Fe⁰	61.7	5.4
纯GO	43.9	2.9

吸附剂名称	q_m/ (mg·g^-1)	吸附条件		参考文献
吸附剂名称	q_m/ (mg·g^-1)	pH值	温度/K	参考文献
阴离子交换纤维	8.3	2.0	353	[21]
硅藻土	17.2	5.0	298	[22]
壳聚糖插层蒙脱土	18.8	5.0	293	[23]
活性碳纤维	76.5	8.0	283	[24]
Fe⁰/GO	85.6	4.0	303	本文

吸附剂名称	q_m/ (mg·g^-1)	吸附条件		参考文献
吸附剂名称	q_m/ (mg·g^-1)	pH值	温度/K	参考文献
水化氯铝酸钙	3.5	6.0	298	[25]
磁性水葫芦生物炭	18.5	2.0	298	[26]
γ-Al₂O₃固载水滑石	49.2	3.0	298	[27]
铁铝水滑石	51.3	6.0	298	[28]
Fe⁰/GO	95.8	4.0	303	本文

污染物名称	Langmuir模型参数			Freundlich模型参数
污染物名称	b/ (L·mg^-1)	q_max/ (mg·g^-1)	R²	K_F/ (mg^1-ⁿ·Lⁿ)	n	R²
弱酸性蓝AS	0.682 7	4.66	0.957 4	5.686	0.460 1	0.886 3
Cr (Ⅵ)	0.011 7	178.57	0.994 8	14.150	0.416 2	0.992 1

污染物名称	准一级动力学参数			准二级动力学参数
污染物名称	k₁×10³	q_e/ (mg·g^-1)	R²	k₂×10⁵	q_e/ (mg·g^-1)	R²
弱酸性蓝AS	5.40	48.85	0.940 6	19.57	71.43	0.995 4
Cr (Ⅵ)	7.10	63.44	0.876 4	6.60	68.97	0.931 2

零价铁/氧化石墨烯复合吸附剂对染料和重金属的吸附性能

Dye and heavy metal adsorption performance of zero-valent iron/graphene oxide blend absorbent

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