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林业科学 ›› 2018, Vol. 54 ›› Issue (3): 117-122.doi: 10.11707/j.1001-7488.20180312

• 论文与研究报告 • 上一篇    下一篇

单宁改性制备生物质吸附剂及其性能表征

李湘洲1,2, 王玲芝1, 旷春桃1, 周军1   

  1. 1. 中南林业科技大学材料科学与工程学院 长沙 410004;
    2. 南方林业生态应用技术国家工程实验室 长沙 410004
  • 收稿日期:2016-07-21 修回日期:2016-08-11 出版日期:2018-03-25 发布日期:2018-04-13
  • 基金资助:
    "十一五"科技支撑计划项目(2006BAD18B04);"十二五"科技支撑计划项目(2012BAD21B05)。

Preparation and Function of Adsorbents with Modified Tannin

Li Xiangzhou1,2, Wang Lingzhi1, Kuang Chuntao1, Zhou Jun1   

  1. 1. School of Materials Science and Engineering, Central South University of Forestry and Technology Changsha 410004;
    2. National Engineering Lab. for Applied Technology of Forestry & Ecology in South China Changsha 410004
  • Received:2016-07-21 Revised:2016-08-11 Online:2018-03-25 Published:2018-04-13

摘要: [目的]对单宁进行化学改性制备改性单宁生物质吸附剂,并对其性能进行表征,为天然单宁在重金属离子污染治理中的应用提供技术基础。[方法]以杨梅单宁(BT)和马占相思单宁(AMT)为原料,在碱性条件下,甲醛先与缩合单宁反应生成羟甲基化单宁,再以聚丙烯酰胺(PAM)中的酰胺基为亲核试剂,与羟甲基化单宁反应,分别生成不溶于水的改性杨梅单宁吸附剂(PBT)和马占相思单宁吸附剂(PAMT),通过扫描电镜(SEM)、能谱分析(EDS)和红外光谱(FTIR)对单宁改性与吸附Pb(Ⅱ)和Cu(Ⅱ)前后的物理化学特性进行分析,对比研究BT、AMT、PAM、PBT和PAMT对Pb(Ⅱ)和Cu(Ⅱ)的吸附性能。[结果]BT和AMT在改性过程中发生了有效交联反应,颗粒度增大,微观表面无明显变化,且改性吸附剂吸附金属离子通过离子交换生成了稳定的螯合物;PBT对Cu(Ⅱ)和Pb(Ⅱ)的最大平衡吸附容量分别为49.75和142.86 mg·g-1,而PAMT对Cu(Ⅱ)和Pb(Ⅱ)的最大平衡吸附量分别为34.16和115.61 mg·g-1。[结论]通过PAM改性可获得稳定性好、吸附能力强的改性单宁吸附剂,其对Pb(Ⅱ)和Cu(Ⅱ)的平衡吸附容量均高于原料BT、AMT以及改性剂PAM本身的吸附容量,说明制备的PAM改性单宁是一类具有开发前景的生物质吸附材料。

关键词: 单宁, 聚丙烯酰胺, 改性单宁吸附剂, Pb(Ⅱ)和Cu(Ⅱ), 吸附容量

Abstract: [Objective] The present work is for studying the preparation of adsorbent with modified tannin to provide technical basis for the application of natural tannin in the treatment of heavy metal ions pollution.[Method]With bayberry tannin (BT) and acacia mangium tannin (AMT) as raw material, the formaldehyde reacted with condensed tannin to form hydroxyl methylated tannin under alkaline conditions. Then the amide group of polyacrylamide (PAM), as nucleophilic reagent, reacted with hydroxyl methylated tannin to prepare bayberry tannin adsorbent PBT and acacia mangium tannin absorbent PAMT, respectively. The physicochemical properties of tannin before and after modification and adsorption of Pb(Ⅱ) and Cu(Ⅱ) were analyzed by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and infrared spectroscopy(FTIR). The adsorption performances of Pb(Ⅱ) and Cu(Ⅱ) were also investigated.[Result]The results showed that the crosslinking reaction was occurred with the modification of BT and AMT, leading to increased particle size, but no significant change in the microscopic surface. The maximum adsorption capacities of 49.75 and 142.86 mg·g-1 were obtained for Cu(Ⅱ)and Pb(Ⅱ)on PBT respectively, and the maximum adsorption capacities of 34.16 and 115.61 mg·g-1 were obtained for Cu(Ⅱ)and Pb(Ⅱ)on PAMT, respectively.[Conclusion]The PAM modified tannin adsorbents have good stability and stronger adsorption capacity. The equilibrium adsorption capacities of Pb (Ⅱ) and Cu (Ⅱ) were higher than those of BT, AMT and PAM, indicating that the PAM modified biomass adsorbent has bright prospect.

Key words: tannin, PAM, PBT and PAMT adsorbents, Pb(Ⅱ)and Cu(Ⅱ), adsorption capacity

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