一种新型水处理剂合成及其对阴离子污染物的选择性去除

张志超; 段亮

doi:10.12153/j.issn.1674-991X.20210513

一种新型水处理剂合成及其对阴离子污染物的选择性去除

doi: 10.12153/j.issn.1674-991X.20210513

张志超^{1, 2,},
段亮^2, ,

1.
北京大学城市与环境学院，地表过程分析与模拟教育部重点实验室
2.
中国环境科学研究院水生态环境研究所

基金项目: 北京大学地表过程分析与模拟教育部重点实验室青年基金资助项目

详细信息

作者简介:
张志超（1987—），女，助理研究员，博士，主要从事水污染物防治技术研究，09zhangzhichao@163.com

通讯作者:
段亮（1983—），男，研究员，博士，主要从事水环境生态修复研究，duanliang@craes.org.cn

中图分类号: X703
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出版历程
- 收稿日期: 2021-09-16

Synthesis of a new water treatment agent and its selective removal of anionic pollutants

ZHANG Zhichao^{1, 2
,},
DUAN Liang^{2
, ,}

1.
Laboratory for Earth Surface Processes of Ministry of Education, College of Urban and Environmental Sciences, Peking University
2.
Institute of Water Ecology and Environment, Chinese Research Academy of Environmental Sciences

摘要

摘要:
通过键合法合成了一种新型水处理剂—氯甲基聚苯乙烯树脂固载的功能化离子液体〔PS-CH₂-(CH₂)₁₆Im〕，选取Cr(Ⅵ)和甲基橙(MO)为模型阴离子污染物，采用静态与动态柱试验对其选择性去除水中阴离子污染物的性能进行系统研究。结果表明，PS-CH₂-(CH₂)₁₆Im对阴离子污染物选择性吸附性能良好，30 min可达吸附平衡，对Cr(Ⅵ)与MO的静态最大吸附量分别为90.9和62.8 mg/g，可有效去除低至0.004 mg/L的Cr(Ⅵ)。PS-CH₂-(CH₂)₁₆Im易于再生，5次重复使用后吸附性能无显著降低。通过测定缔合常数，明确PS-CH₂-(CH₂)₁₆Im对阴离子污染物的吸附机理为离子缔合作用。
- 表面键合 /
- 固载离子液体 /
- 阴离子污染物 /
- 选择性吸附 /
- 样品前处理 /
- 废水深度处理
Abstract:
A novel water treatment agent, chloromethyl polystyrene resin supported task-specific ionic liquid(PS-CH₂-(CH₂)₁₆Im) was synthesized by a bonding method. Cr(Ⅵ) and methyl orange (MO) were selected as model anionic pollutants. The performance of selective removal of anionic pollutants in water was systematically investigated by both static and dynamic column tests. The results showed that PS-CH₂-(CH₂)₁₆Im had good selective adsorption for anionic pollutants. The adsorption equilibrium could be reached in 30 minutes, with static maximum adsorption capacity of 90.9 and 62.8 mg/g for Cr(Ⅵ) and MO, respectively, and also could effectively remove Cr(Ⅵ) at a concentration as low as 0.004 mg/L. PS-CH₂-(CH₂)₁₆Im was easy to regenerate and recycle at least 5 times without obvious loss in adsorption performance. By measuring the association constant, it was known that the adsorption mechanism of PS-CH₂-(CH₂)₁₆Im on anionic pollutants was ion association.
- surface bonding /
- supported ionic liquid /
- anions pollutant /
- selective adsorption /
- sample pretreatment /
- advanced treatment of wastewater

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图 1 N-正十六烷基咪唑的制备

Figure 1. Preparation of 1-hexadecylimidazole

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图 2 PS-CH₂-(CH₂)₁₆Im的制备

Figure 2. Preparation of PS-CH₂-(CH₂)₁₆Im

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图 3 N-正十六烷基咪唑的¹HNMR表征

Figure 3. ¹HNMR characterization of 1-hexadecylimidazole

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图 4 PS-CH₂Cl固载离子液体前后的FTIR表征

Figure 4. FTIR characterization of PS-CH₂Cl before and after ionic liquid supporting

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图 5 PS-CH₂Cl固载离子液体前后的扫描电镜

Figure 5. SEM image of PS-CH₂Cl before and after ionic liquid supporting

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图 6 样品的热重曲线

Figure 6. Thermogravimetric curves of samples

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图 7 温度对Cr(Ⅵ)和MO去除率的影响

Figure 7. Influence of temperature on adsorption of Cr(Ⅵ) and MO

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图 8 初始pH对PS-CH₂-(CH₂)₁₆Im去除Cr(Ⅵ)和MO的影响

Figure 8. Influence of initial pH on Cr(Ⅵ) and MO removed by PS-CH₂-(CH₂)₁₆Im

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图 9 PS-CH₂-(CH₂)₁₆Im对Cr(Ⅵ)和MO的吸附动力学曲线和假二级动力学曲线

Figure 9. Adsorption kinetic and pseudo-second order kinetic curve of Cr(Ⅵ) and MO by PS-CH₂-(CH₂)₁₆Im

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图 10 Cr(Ⅵ)和MO在PS-CH₂-(CH₂)₁₆Im表面吸附的Langmuir模型

Figure 10. Langmuir model for surface adsorption of Cr(Ⅵ) and MO by PS-CH₂-(CH₂)₁₆Im

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图 11 PS-CH₂-(CH₂)₁₆Im与PS-717对Cr(Ⅵ)和MO去除率的对比

Figure 11. Comparison for the removal efficiency of Cr(Ⅵ) and MO by PS-CH₂-(CH₂)₁₆Im and traditional anion resin (PS-717)

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图 12 洗脱流速与洗脱体积对微型萃取柱洗脱率的影响

Figure 12. Effects of elution flow rate and elution volume on the enrichment efficiency of microextraction column

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图 13 25 ℃时Cr₂O₇ ²⁻-[C₁₆Iim]Cl-水和MO-[C₁₆Im]Cl-水的电导率随离子液体浓度的变化

Figure 13. Change of conductivity of Cr₂O₇ ²⁻-[C₁₆Iim]Cl-water and MO-[C₁₆Im]Cl-water with ionic liquid concentration at 25 ℃

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表 1 不同洗脱剂对Cr(Ⅵ)的洗脱效果

Table 1. Elution effect of different eluents on Cr(Ⅵ)

项目 HNO₃浓度/(mol/L) NaOH浓度/(mol/L)
1 2 3 4 1 2 3

Cr(Ⅵ)洗脱率/% 95 87 85 83 85 89 91

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表 2 不同洗脱剂对MO的洗脱效果

Table 2. Elution effect of different eluents on MO

项目 NH₄Cl浓度/
(mol/L) NaCl浓度/
(mol/L) NaOH浓度/
(mol/L) HCl浓度/
(mol/L)
1 1 1 1 2 3 4 6 12

MO洗脱
率/% 1.43 0.90 0 100 89 80 79 66 0.08

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