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首页> 外文期刊>Journal of Hazardous Materials >Determining the selectivity of divalent metal cations for the carboxyl group of alginate hydrogel beads during competitive sorption
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Determining the selectivity of divalent metal cations for the carboxyl group of alginate hydrogel beads during competitive sorption

机译：测定竞争吸附过程中二价金属阳离子对藻酸盐水凝胶珠的羧基的选择性

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摘要

To investigate the competitive sorption of divalent metal ions such as Ca2+, Cu2+, Ni2+, and Pb2+ on alginate hydrogel beads, batch and column tests were conducted. The concentration of carboxyl group was found to be limited in the preparation of spherical hydrogel beads. From kinetic test results, 80% of sorption was observed within 4 h, and equilibrium was attained in 48 h. According to the comparison of the total uptake and release, divalent metal ions were found to stoichiometrically interact with the carboxyl group in the alginate polymer chain. From the Langmuir equation, the maximum capacities of Pb2+, Cu2+, and Ni2+ were calculated to be 1.1, 0.48, and 0.13 mmol/g, respectively. The separation factor (a) values for alpha(Pb/Cu), alpha(Pb/Ni), and alpha(Cu/Ni) were 14.0, 98.9, and 7.1, respectively. The sorption capacity of Pb2+ was not affected by the solution pH; however, the sorption capacities of Cu2+ and Ni2+ decreased with increasing solution pH, caused by competition with hydrogen. According to the result from the fixed column test, Pb2+ exhibited the highest affinity, followed by Cu2+ and Ni2+, which is in exact agreement with those of kinetic and isotherm tests. The sorbent could be regenerated using 4% HCl, and the regenerated sorbent exhibited 90% capacity upto 9 cycles. (C) 2015 Elsevier B.V. All rights reserved.
机译：为了研究藻酸盐水凝胶珠上二价金属离子（如Ca2 +，Cu2 +，Ni2 +和Pb2 +）的竞争性吸附，进行了分批和柱测试。发现在球形水凝胶珠的制备中羧基的浓度受到限制。根据动力学测试结果，在4小时内观察到80％的吸附，并在48小时内达到平衡。根据总摄取和释放的比较，发现二价金属离子与藻酸盐聚合物链中的羧基化学计量相互作用。根据Langmuir方程，Pb2 +，Cu2 +和Ni2 +的最大容量分别计算为1.1、0.48和0.13 mmol / g。 alpha（Pb / Cu），alpha（Pb / Ni）和alpha（Cu / Ni）的分离因子（a）值分别为14.0、98.9和7.1。溶液pH值对Pb2 +的吸附能力没有影响。然而，Cu2 +和Ni2 +的吸附能力随着溶液pH值的增加而降低，这是由于与氢竞争引起的。根据固定柱测试的结果，Pb2 +表现出最高的亲和力，其次是Cu2 +和Ni2 +，这与动力学和等温线测试的结果完全一致。可以使用4％的HCl再生吸附剂，再生的吸附剂在90个循环中表现出90％的容量。 （C）2015 Elsevier B.V.保留所有权利。

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  • 来源
    《Journal of Hazardous Materials》 |2015年第15期|11-18|共8页
  • 作者

    An Byungryul; Lee Healim; Lee Soonjae; Lee Sang-Hyup; Choi Jae-Woo;

  • 作者单位

    Korea Inst Sci & Technol, Ctr Water Resource Cycle Res, Seoul 136791, South Korea;

    Korea Inst Sci & Technol, Ctr Water Resource Cycle Res, Seoul 136791, South Korea;

    Korea Inst Sci & Technol, Ctr Water Resource Cycle Res, Seoul 136791, South Korea;

    Korea Inst Sci & Technol, Ctr Water Resource Cycle Res, Seoul 136791, South Korea|Korea Univ, Green Sch, Seoul 136701, South Korea;

    Korea Inst Sci & Technol, Ctr Water Resource Cycle Res, Seoul 136791, South Korea|Univ Sci & Technol, Dept Energy & Environm Engn, Taejon 305350, South Korea;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Sorption; Carboxyl group; Competition; Heavy metal; Selectivity;

    机译：吸附;羧基;竞争;重金属;选择性;

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