Adsorption performance of titanium based MXene aerogel for Hg(Ⅱ) in desulfurization wastewater

doi:10.16085/j.issn.1000-6613.2024-1490

Abstract

Abstract:

In response to the inefficient Hg(Ⅱ) adsorption of traditional titanium-based MXene materials, the MXene aerogel was successfully prepared by crosslinking titanium-based MXene dispersion with waterborne polyurethane through a simple freeze induced co-assembly method in this paper. Its Hg(Ⅱ) adsorption performance was investigated in simulated Hg(Ⅱ) containing wastewater, and the influence of initial pH of solution, heavy metal ions, anions, etc. were investigated. The adsorption kinetics and isotherm fitting were also carried out. In addition, the physicochemical properties of MXene aerogel were characterized and the Hg(Ⅱ) adsorption mechanism was preliminarily discussed. The results showed that MXene aerogel exhibited high Hg(Ⅱ) adsorption efficiency and good anti-interference ability against impurity ions in the pH range of 5—11. Its Hg(Ⅱ) adsorption process was more in line with the pseudo first order kinetic model with the q_e of 150.89mg/g. The Langmuir model could accurately describe the adsorption behavior of Hg(Ⅱ), which belonged to monolayer adsorption. The characterization results indicated that the Al layer in the Ti₃AlC₂ phase of MXene aerogel was replaced by surface active functional groups (—O, —OH, etc.), thus providing rich active sites for Hg(Ⅱ) adsorption. Hg(Ⅱ) was mainly adsorbed and removed by surface complexation with functional groups such as —O and —OH. The research results can provide basic data and theoretical support for the application of MXene aerogel in mercury pollution control of desulfurization wastewater from coal-fired power plants.

Key words: waste water, adsorption, MXene aerogel, mercury

摘要：

针对传统钛基MXene材料Hg(Ⅱ)吸附性能低的瓶颈，通过简单的冻结诱导共组装法将钛基MXene分散液与水性聚氨酯交联，成功制备了MXene气凝胶，考察了其对模拟含汞废水中Hg(Ⅱ)的吸附性能及溶液初始pH、重金属离子、阴离子等因素的影响，并进行了吸附动力学和吸附等温线拟合。此外，借助相关表征手段分析了MXene气凝胶的理化特性，初步讨论了Hg(Ⅱ)的吸附机理。结果表明，MXene气凝胶在pH为5~11的范围内表现出高效的Hg(Ⅱ)吸附性能和良好的抗杂离子干扰能力，其对Hg(Ⅱ)吸附过程更符合准一级动力学模型，q_e为150.89mg/g。Langmuir模型能够较准确地描述Hg(Ⅱ)的吸附行为，该吸附过程属于单分子层吸附。表征结果证实MXene气凝胶Ti₃AlC₂相中的Al层被表面活性官能团（—O、—OH等）取代，为Hg(Ⅱ)吸附提供了丰富的活性位点，Hg(Ⅱ)主要与—O、—OH等官能团经表面络合作用被吸附去除。研究成果为MXene气凝胶在燃煤电厂脱硫废水汞污染控制中的应用提供基础数据和理论支撑。

关键词: 废水, 吸附, MXene气凝胶, 汞

CLC Number:

X703

CHEN Chongming, LI Dong, YU Jinxing, CHE Kai, HE Wei, CHEN Chuanmin. Adsorption performance of titanium based MXene aerogel for Hg(Ⅱ) in desulfurization wastewater[J]. Chemical Industry and Engineering Progress, 2025, 44(6): 3112-3120.

陈崇明, 李栋, 郁金星, 车凯, 何伟, 陈传敏. 钛基MXene气凝胶对脱硫废水中Hg(Ⅱ)的吸附性能[J]. 化工进展, 2025, 44(6): 3112-3120.

Figures/Tables 14

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序号	Hg(Ⅱ)去除量/mg	脱附液中Hg(Ⅱ)含量/mg	吸附剂中Hg(Ⅱ)含量/mg	质量平衡
1	5.7315	5.2156	0.5035	99.78%
2	5.6385	4.9557	0.6683	99.74%
3	5.5050	4.7445	0.7805	100.36%

序号	Hg(Ⅱ)去除量/mg	脱附液中Hg(Ⅱ)含量/mg	吸附剂中Hg(Ⅱ)含量/mg	质量平衡
1	5.7315	5.2156	0.5035	99.78%
2	5.6385	4.9557	0.6683	99.74%
3	5.5050	4.7445	0.7805	100.36%

时间/min	浓度/mg·L^-1	吸附量/mg·g^-1
0	63.822	0
3	58.138	14.210
5	55.362	21.150
10	52.152	29.175
15	47.801	40.053
20	41.762	55.150
30	37.500	65.806
40	33.254	76.420
60	25.536	95.715
90	15.323	121.248
120	10.188	134.030
720	2.054	154.420

时间/min	浓度/mg·L^-1	吸附量/mg·g^-1
0	63.822	0
3	58.138	14.210
5	55.362	21.150
10	52.152	29.175
15	47.801	40.053
20	41.762	55.150
30	37.500	65.806
40	33.254	76.420
60	25.536	95.715
90	15.323	121.248
120	10.188	134.030
720	2.054	154.420

动力学模型	参数	拟合结果
准一级	q_{e, cal}/mg·g^-1	150.89
	k₁/min^-1	0.01881
	R²	0.9903
准二级	q_{e, cal}/mg·g^-1	170.01
	k₂/g·mg^-1·min^-1	0.00014
	R²	0.9898