Chemical Industry and Engineering Progress ›› 2023, Vol. 42 ›› Issue (12): 6589-6599.DOI: 10.16085/j.issn.1000-6613.2023-0123

• Resources and environmental engineering • Previous Articles    

Preparation of amino-functionalized dialdehyde starch adsorbent for adsorption of Pb(Ⅱ) ions

GUO Yu(), TONG Minxin, WU Hongmei   

  1. School of Chemical and Environmental Engineering, Liaoning University of Technology, Jinzhou 121001, Liaoning, China
  • Received:2023-02-01 Revised:2023-03-12 Online:2024-01-08 Published:2023-12-25
  • Contact: GUO Yu

氨基功能化双醛淀粉吸附剂的制备及其对Pb(Ⅱ)的吸附行为

郭宇(), 佟民心, 吴红梅   

  1. 辽宁工业大学化学与环境工程学院,辽宁 锦州 121001
  • 通讯作者: 郭宇
  • 作者简介:郭宇(1981—),男,教授,博士生导师,研究方向为化工新材料。E-mail:guoyulnut@163.com
  • 基金资助:
    国家自然科学基金(21601075);辽宁省“兴辽英才计划”(XLYC2007171);辽宁省自然科学基金面上项目(2021-MS-321)

Abstract:

Amino functionalized dialdehyde starch (NH2-DAS) was successfully synthesized by Schiff base reaction of DAS with hydrazine hydrate. During the preparation process, dialdehyde starch (DAS) was firstly prepared using starch as raw material and NaIO4 as oxidant. The morphology, element distribution, thermal stability and surface chemical property of the NH2-DAS adsorbent were characterized by SEM, EDX, XRD, TGA, FTIR and XPS. The adsorption behavior and adsorption mechanism of NH2-DAS adsorbent toward Pb(‍Ⅱ) from aqueous solution were studied. The results showed that the adsorption behavior of Pb(‍Ⅱ) onto NH2-DAS adsorbent could be well described by Langmuir isotherm model and Pseudo-second-order kinetic mode. The NH2-DAS exhibited a high adsorption capacity of 165mg/g toward Pb(‍Ⅱ) at adsorption temperature of 45℃, pH=5.5 and the adsorption time of 240min. The adsorption of NH2-DAS on Pb(‍Ⅱ) mainly depended on the coordination bonds between—C̿    N—, —NH2 groups and Pb(‍Ⅱ) ions. The adsorption process was a spontaneous, endothermic and entropy increase process. After five times of regeneration test, the adsorption capacity of NH2-DAS for Pb(‍Ⅱ) was still above 84.8% of original adsorption capacity. Therefore, the NH2-DAS adsorbent had potential application prospects in the removal of Pb(‍Ⅱ) ions from aqueous solution.

Key words: dialdehyde starch, adsorbent, lead(Ⅱ) ions, adsorption mechanism

摘要:

以淀粉为原料,高碘酸钠为氧化剂,制备出双醛淀粉(DAS),然后与水合肼反应制备了氨基功能化双醛淀粉吸附剂(NH2-DAS)。采用扫描电子显微镜、能量色散X射线光谱仪、X射线衍射仪、热重分析仪和X射线光电子能谱等表征手段对NH2-DAS的形貌、元素组成、热稳定性和表面化学性质进行了分析。详细研究了NH2-DAS吸附剂对水溶液中Pb(Ⅱ)离子的吸附行为和吸附机理。结果表明,NH2-DAS对Pb(Ⅱ)的吸附符合Langmuir等温吸附模型和准二级吸附动力学模型。当吸附温度为45℃、pH为5.5、吸附时间为240min时,NH2-DAS对Pb(Ⅱ)的吸附容量达到165mg/g。NH2-DAS对Pb(Ⅱ)的吸附作用主要是利用其表面—C̿    N—和—NH2与Pb(Ⅱ)的配位螯合作用实现的,且为自发、吸热的熵增过程。经过5次再生利用后,NH2-DAS对Pb(Ⅱ)的吸附容量仍然能达到初始吸附容量的84.8%。该NH2-DAS吸附剂在吸附Pb(Ⅱ)方面具有潜在的应用前景。

关键词: 双醛淀粉, 吸附剂, 铅离子, 吸附机理

CLC Number: 

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