化工进展 ›› 2023, Vol. 42 ›› Issue (5): 2616-2625.DOI: 10.16085/j.issn.1000-6613.2022-1282

• 精细化工 • 上一篇    下一篇

胶原纤维固化黑荆树单宁对硼同位素的分离

庞楠炯1(), 王晓玲1,2, 廖学品1,2,3(), 石碧1,2,3   

  1. 1.四川大学生物质与皮革工程系,四川 成都 610065
    2.四川大学皮革化学与工程教育部重点实验室,四川 成都 610065
    3.四川大学制革清洁技术国家工程研究中心,四川 成都 610065
  • 收稿日期:2022-07-08 修回日期:2022-08-31 出版日期:2023-05-10 发布日期:2023-06-02
  • 通讯作者: 廖学品
  • 作者简介:庞楠炯(1998—),男,硕士研究生,研究方向为生物质功能材料。E-mail:pangnanjiong@qq.com
  • 基金资助:
    国家自然科学基金(22108181);反应堆燃料及材料重点实验室基金(6142A06190601)

Separation of boron isotopes by collagen fibers-immobilized black wattle tannin

PANG Nanjiong1(), WANG Xiaoling1,2, LIAO Xuepin1,2,3(), SHI Bi1,2,3   

  1. 1.Department of Biomass and Leather Engineering, Sichuan University, Chengdu 610065, Sichuan, China
    2.Key Laboratory of Leather Chemistry and Engineer of Ministry of Education, Sichuan University, Chengdu 610065, Sichuan, China
    3.National Engineering Research Center of Clean Technology in Leather Industry, Sichuan University, Chengdu 610065, Sichuan, China
  • Received:2022-07-08 Revised:2022-08-31 Online:2023-05-10 Published:2023-06-02
  • Contact: LIAO Xuepin

摘要:

使用戊二醛为交联剂,将黑荆树单宁(BWT)固化在胶原纤维(CF)表面,得到新型硼同位素分离树脂 CF-BWT。通过FTIR、XPS、SEM、11B MAS NMR分析,探究了CF-BWT吸附硼前后表面元素组成、形貌结构以及吸附机理等。研究结果表明,当pH为8.0,硼初始浓度为110mg/L时,CF-BWT的平衡吸附量可达1.9mg/g。吸附平衡符合Langmuir模型,平衡吸附量随温度升高而增加。吸附动力学可用准二级动力学模型描述,由模型计算得到的平衡吸附量与实验值接近。进一步研究发现,CF-BWT表面固化的黑荆树单宁与硼形成硼-单宁活性交换界面,促使10B和11B发生同位素交换反应,从而将10B富集于CF-BWT表面,实现10B和11B的分离。当pH为7.0时,CF-BWT对10B和11B的单级分离因子可达1.17。当初始硼同位素丰度比(10B/11B)为0.2180时,以CF-BWT为填料的固定床对10B和11B进行分离,发现穿透段硼同位素丰度比(10B/11B)为0.2149,而在洗脱段则达到0.2234。

关键词: 胶原纤维, 黑荆树单宁, 吸附作用, 硼同位素分离, 分离因子, 固定床

Abstract:

Glutaraldehyde was used as a cross-linking agent to immobilize black wattle tannin (BWT) on the surface of collagen fibers (CF) to obtain a new type of boron isotope separation resin (CF-BWT). Using FTIR, XPS, SEM and 11B MAS NMR, the elemental composition, morphology, structure and adsorption mechanism of CF-BWT to boron were explored. The results showed that the equilibrium adsorption capacity of CF-BWT could reach 1.9mg/g when the pH was 8.0 and the initial concentration of boron was 110mg/L. The adsorption isotherms of CF-BWT to boron could be described by the Langmuir equation and the adsorption capacity increased with the increase of temperature. The adsorption kinetics could also be described by the pseudo-second-order kinetic model, and the equilibrium adsorption capacities calculated by the model were close to the experimental value. Furthermore, the boron-tannin active exchange interface formed by the tannin immobilized on the surface of CF-BWT promoted the isotope exchange reaction of 10B and 11B, thereby enriching 10B on the surface of CF-BWT and realizing the separation of 10B and 11B. The corresponding single stage separation factor could reach 1.17 at pH=7.0. When the initial boron isotope ratio (10B/11B) was 0.2180, the column of CF-BWT was used for the separation of 10B and 11B. The results showed that the boron isotope ratio (10B/11B) was 0.2149 at the penetration section and high up to 0.2234 at the elution section, suggesting effective separation of 10B and 11B.

Key words: collagen fibers, black wattle tannin, adsorption, boron isotope separation, separation factor, fixed bed

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