氮修饰木质素基超交联聚合物的制备及其放射性碘捕获

doi:10.16085/j.issn.1000-6613.2021-2422

化工进展 ›› 2022, Vol. 41 ›› Issue (10): 5599-5611.DOI: 10.16085/j.issn.1000-6613.2021-2422

氮修饰木质素基超交联聚合物的制备及其放射性碘捕获

万欢爱¹^,²(), 邵礼书¹^,²(), 刘娜¹^,², 毛莉¹, 张林¹^,², 詹鹏¹^,², 陈介南¹^,²

^1.中南林业科技大学材料科学与工程学院，湖南长沙 410004
^2.中南林业科技大学国家林业和草原局生物乙醇研究中心，湖南长沙 410004

收稿日期:2021-11-25 修回日期:2022-05-31 出版日期:2022-10-20 发布日期:2022-10-21
通讯作者: 邵礼书
作者简介:万欢爱（1997—），女，硕士研究生，研究方向为生物质能源与材料。E-mail：wanhuanai921@163.com。
基金资助:
国家重点研发计划(2019YFE0114600);湖南省自然科学基金青年项目(2021JJ41065);长沙市自然科学基金(kq2014148);中南林业科技大学研究生科技创新基金

Preparation of nitrogen modified lignin-based hyper-cross-linked polymers and their radioactive iodine capture

WAN Huan’ai¹^,²(), SHAO Lishu¹^,²(), LIU Na¹^,², MAO Li¹, ZHANG Lin¹^,², ZHAN Peng¹^,², CHEN Jienan¹^,²

^1.College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, Hunan, China
^2.Administration of National Forestry and Grassland Bioethanol Research Center, Central South University of Forestry and Technology, Changsha 410004, Hunan, China

Received:2021-11-25 Revised:2022-05-31 Online:2022-10-20 Published:2022-10-21
Contact: SHAO Lishu

摘要/Abstract

摘要：

开发高效、低成本的放射性碘捕获材料对核能的安全利用和核废料处理具有重要意义。本文针对目前碘捕获材料吸附容量低、成本高等问题，以含有羟基、羧基等活性位点的木质素为基础原料，N,N-亚甲基双丙烯酰胺（MBA）为氮源，对氯甲基苯乙烯（VBC）为功能单体，通过自由基聚合接枝与Friedel-Crafts烷基化两步反应，原位构筑一系列氮修饰木质素基超交联聚合物（NLHCPs），其比表面积最高可达715.8m²/g，且有较高的氮含量（3.95%~4.48%，原子分数）。分别研究了NLHCPs对碘蒸气和碘正己烷溶液的吸附性能，结果表明NLHCP-2的碘蒸气吸附容量最高，可达2.5g/g，吸附作用主要为化学吸附，碘分子在聚合物表面转变成聚碘阴离子的形式。而其对正己烷中碘的吸附等温线更符合Freundlich模型，吸附最大平衡容量可达230.8mg/g，动力学拟合表明其吸附速率主要受扩散过程控制。吸附碘蒸气后的材料，在乙醇中可快速脱附，具有良好循环使用性能。

关键词: 木质素, 聚合物, 吸附剂, 碘捕获, 脱附

Abstract:

The development of radioactive iodine capture materials with high efficiency and low cost is of great significance for the safe utilization of nuclear energy and the disposal of nuclear waste. In view of the application status which the radioactive iodine capture materials have low adsorption capacity and adsorption rate, and high cost. Green and low-cost lignin has rich active sites such as hydroxyl group and carboxyl group, etc., which will have potential application prospects in iodine capture. Here, the lignin with rich active sites such as hydroxyl group and carboxyl group, etc. was selected as the basic raw materials, N,N-methylene bisacrylamide (MBA) as nitrogen source and crosslinking agent, and 4-vinylbenzyl chloride (VBC) as functional monomer, a series of nitrogen modified lignin based hyper-cross-linked polymers (NLHCPs) were synthesized insitu by the two-step reaction including free radical grafting copolymerization and Friedel-Crafts alkylation, the specific surface areas of these materials was up to 715.8m²/g, and had high nitrogen content (3.95%—4.48%). The adsorption performance of iodine vapor and iodine/n-hexane solution on these NLHCPs were studied, respectively. The results showed that NLHCP-2 had the largest adsorption capacity of iodine vapor (2.5g/g), and the adsorption was mainly chemical adsorption, and the iodine molecule was converted to the polyiodide anion form at the polymer surface. At the same time, the adsorption isotherms of iodine in n-hexane solution on NLHCP-2 was more consistent with Freundlich model, and the maximum equilibrium capacity reached 230.8mg/g. The kinetic curves fitting showed that the adsorption rate was mainly controlled by the diffusion process. In addition, the iodine-loaded NLHCPs can be quickly desorbed in ethanol, and had good cycling performance. This work will provide new ideas for the development of lignin-based porous materials and offer important guidance for green and low-cost radioactive iodine capture.

Key words: lignin, polymers, adsorbents, iodine capture, desorption

中图分类号:

O636.2

万欢爱, 邵礼书, 刘娜, 毛莉, 张林, 詹鹏, 陈介南. 氮修饰木质素基超交联聚合物的制备及其放射性碘捕获[J]. 化工进展, 2022, 41(10): 5599-5611.

WAN Huan’ai, SHAO Lishu, LIU Na, MAO Li, ZHANG Lin, ZHAN Peng, CHEN Jienan. Preparation of nitrogen modified lignin-based hyper-cross-linked polymers and their radioactive iodine capture[J]. Chemical Industry and Engineering Progress, 2022, 41(10): 5599-5611.

图/表 16

参考文献 47

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材料	比表面积 /m²·g^-1	孔体积 /cm³·g^-1	平均孔径 /nm	微孔孔容 /cm³·g^-1	介孔孔容 /cm³·g^-1	微孔比表面积 /m²·g^-1	介孔比表面积 /m²·g^-1	元素原子分数/%
材料	比表面积 /m²·g^-1	孔体积 /cm³·g^-1	平均孔径 /nm	微孔孔容 /cm³·g^-1	介孔孔容 /cm³·g^-1	微孔比表面积 /m²·g^-1	介孔比表面积 /m²·g^-1	C	O	N	Cl	I
NLHCP-1	715.8	0.85	4.7	0.18	0.16	367.3	39.3	86.2	7.5	4.0	1.5	—
NLHCP-2	364.4	0.24	2.6	0.11	0.07	245.7	27.3	70.2	23.7	4.5	1.1	—
NLHCP-3	190.4	0.36	7.6	0.04	0.22	58.8	45.1	80.4	13.6	4.1	0.8	—
NLHCP-2@I₂	—	—	—	—	—	—	—	72.0	16.5	4.8	1.2	4.2

材料	比表面积 /m²·g^-1	孔体积 /cm³·g^-1	平均孔径 /nm	微孔孔容 /cm³·g^-1	介孔孔容 /cm³·g^-1	微孔比表面积 /m²·g^-1	介孔比表面积 /m²·g^-1	元素原子分数/%
材料	比表面积 /m²·g^-1	孔体积 /cm³·g^-1	平均孔径 /nm	微孔孔容 /cm³·g^-1	介孔孔容 /cm³·g^-1	微孔比表面积 /m²·g^-1	介孔比表面积 /m²·g^-1	C	O	N	Cl	I
NLHCP-1	715.8	0.85	4.7	0.18	0.16	367.3	39.3	86.2	7.5	4.0	1.5	—
NLHCP-2	364.4	0.24	2.6	0.11	0.07	245.7	27.3	70.2	23.7	4.5	1.1	—
NLHCP-3	190.4	0.36	7.6	0.04	0.22	58.8	45.1	80.4	13.6	4.1	0.8	—
NLHCP-2@I₂	—	—	—	—	—	—	—	72.0	16.5	4.8	1.2	4.2

序号	吸附剂	比表面积/m²·g^-1	温度/K	吸附量/g·g^-1	文献
1	共轭微孔聚合纳米管（CMPN-1-3）	1368	343	2.08	［33］
2	含噻吩基团的共轭微孔聚合物	120	353	3.45	［34］
3	异孔COF空心微球（SIOC-COF-7）	618	348	4.81	［35］
4	有机聚合物（pha-HcoP-1）	217	353	1.31	［36］
5	有机多孔聚合物（NDB-H）	117	353	4.43	［37］
6	多孔芳香骨架材料（PAF-21 /22）	104	353	1.52	［38］
7	共价三嗪聚合物（CTFs）	1476/897/62	348	4.31/2.41/1.18	［39］
8	巴比妥酸基吸附剂（UiO-66-NH₂）	406/317	353	1.17/1.33	［40］
9	木质素基聚合物（NLHCP-2）	444	351	2.50	本文研究

序号	吸附剂	比表面积/m²·g^-1	温度/K	吸附量/g·g^-1	文献
1	共轭微孔聚合纳米管（CMPN-1-3）	1368	343	2.08	［33］
2	含噻吩基团的共轭微孔聚合物	120	353	3.45	［34］
3	异孔COF空心微球（SIOC-COF-7）	618	348	4.81	［35］
4	有机聚合物（pha-HcoP-1）	217	353	1.31	［36］
5	有机多孔聚合物（NDB-H）	117	353	4.43	［37］
6	多孔芳香骨架材料（PAF-21 /22）	104	353	1.52	［38］
7	共价三嗪聚合物（CTFs）	1476/897/62	348	4.31/2.41/1.18	［39］
8	巴比妥酸基吸附剂（UiO-66-NH₂）	406/317	353	1.17/1.33	［40］
9	木质素基聚合物（NLHCP-2）	444	351	2.50	本文研究

材料	准一级动力学			准二级动力学
材料	Q_e	K₁	R²	Q_e	K₂	R²
NLHCP-1	167.3	5.5×10^-3	0.9754	214.5	2.4×10^-5	0.9817
NLHCP-2	189.2	2.3×10^-2	0.9882	216.3	1.2×10^-4	0.9548
NLHCP-3	175.4	1.7×10^-2	0.9733	202.2	1.0×10^-4	0.9512

氮修饰木质素基超交联聚合物的制备及其放射性碘捕获

Preparation of nitrogen modified lignin-based hyper-cross-linked polymers and their radioactive iodine capture

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材料	Langmuir模型			Freundlich模型
材料	Q_m	K_a	R²	1/n	K_f	R²
NLHCP-1	186.8	6.3×10^-3	0.9942	0.48	7.95	0.9918
NLHCP-2	230.8	1.1×10^-2	0.9652	0.43	16.23	0.9991
NLHCP-3	228.2	4.5×10^-3	0.9819	0.57	5.16	0.9423

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