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首页> 外文期刊>RSC Advances >Removal of dyes and heavy metal ions from water by magnetic hydrogel beads based on poly(vinyl alcohol)/carboxymethyl starch-g-poly(vinyl imidazole)
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Removal of dyes and heavy metal ions from water by magnetic hydrogel beads based on poly(vinyl alcohol)/carboxymethyl starch-g-poly(vinyl imidazole)

机译：基于聚（乙烯醇）/羧甲基淀粉-G-聚（乙烯基咪唑）的磁性水凝胶珠从水中除去染料和重金属离子。

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摘要

Novel magnetic nanocomposite hydrogel (m-CVP) beads were prepared by instantaneous gelation of carboxymethyl starch-g-polyvinyl imidazole (CMS-g-PVI), poly(vinyl alcohol) (PVA), and Fe3O4 mixture in boric acid solution followed by crosslinking by glutaraldehyde (GA). Highly porous m-CVP beads with magnetic sensitivity were fully characterized and used as eco-friendly adsorbent for the removal of crystal violet (CV) and congo red (CR) dye and Pb(II), Cu(II) and Cd(II) from water. Batch adsorption results showed that the sorbent had high affinity to the heavy metals and dyes in water. The adsorption kinetics results showed that the adsorption rates could be described by pseudo-second-order kinetics, indicating chemical sorption as the rate determining step. Sorption of Pb(II), Cu(II), Cd(II), CR and CV to m-CVP beads agreed well with the Langmuir adsorption model at different ionic strengths, with maximum adsorption capacities of 65.00, 83.60, 53.20, 83.66 and 91.58 mg g(-1), respectively. Positive values of Delta H-0 showed that the adsorption was chemisorption, and the negative values of Delta G(0) indicated the spontaneity of the pollutant adsorption. Desorption and reusability of m-CVP beads was also investigated for tested heavy metal ions and dyes based on sequential adsorption-desorption cycles. All the studied results indicated that m-CVP beads were an efficient, low cost, and reusable adsorbent for the removal of dye and heavy metal ions from aqueous solutions.
机译：通过羧甲基淀粉-G-聚乙烯基咪唑（CMS-G-PVI），聚（乙烯醇）（PVA）和Fe3O4混合物在硼酸溶液中的瞬时凝胶化制备新的磁纳米复合物水凝胶（M-CVP）珠粒，然后交联通过戊二醛（GA）。具有磁性敏感性的高度多孔M-CVP珠粒被充分表征并用作ECO友好友好的吸附剂，用于去除晶体紫（CV）和刚果红色（CR）染料和PB（II），Cu（II）和CD（II）从水。分批吸附结果表明，吸附剂对水中的重金属和水中的染料具有高亲和力。吸附动力学结果表明，吸附率可通过伪二阶动力学描述，表明化学吸附作为速率确定步骤。 Pb（II），Cd（II），Cr和Cv的吸附，Cr和Cv与不同离子强度的Langmuir吸附模型相同，最大吸附容量为65.00,83.60,53.20,83.66和分别为91.58 mg（-1）。 Delta H-0的阳性值表明，吸附是化学吸附，ΔG（0）的负值表明污染物吸附的自发性。还研究了基于序贯吸附 - 解吸循环的测试重金属离子和染料的M-CVP珠子的解吸和可重用性。所有研究结果表明，M-CVP珠粒是一种高效，低成本和可重复使用的吸附剂，用于从水溶液中除去染料和重金属离子。

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  • 来源
    《RSC Advances》 |2015年第79期|共13页
  • 作者

    Pour Zahra Sekhavat; Ghaemy Mousa;

  • 作者单位

    Univ Mazandaran Fac Chem Polymer Res Lab Babol Sar Iran;

    Univ Mazandaran Fac Chem Polymer Res Lab Babol Sar Iran;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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