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Synthesis and adsorption behavior of chitosan-coated MnFe_2O_4 nanoparticles for trace heavy metal ions removal

机译：壳聚糖包覆的MnFe_2O_4纳米粒子的合成及吸附行为对痕量重金属离子的去除

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摘要

Chitosan-coated MnFe_2O_4 nanoparticles (CCMNPs) of uniform size were synthesized by an eco-friendly method. The obtained product was characterized by XRD, TEM, FTIR and SQUID. The results show that NaOH played a key role in the formation of CCMNPs. The as-prepared CCMNPs with a saturation magnetization of 16.5 emu/g were used as magnetic nanoadsorbents to remove toxic Cu(Ⅱ) and Cr(Ⅵ) ions from aqueous solution. Factors influencing the adsorption of heavy metal ions, such as pH value, agitation time and initial metal concentration were investigated. The maximum adsorption capacities of Cu(Ⅱ) and Cr(Ⅵ) on CCMNPs were 22.6 and 15.4 mg/g, respectively. The competitive adsorption of Cu(Ⅱ) and Cr(Ⅵ) from binary solution by CCMNPs was also studied, and the result shows that the affinity between Cu(Ⅱ) and CCMNPs was much higher than that between Cr(Ⅵ) and CCMNPs.
机译：采用生态友好的方法合成了大小均一的壳聚糖包覆的MnFe_2O_4纳米粒子（CCMNPs）。通过XRD，TEM，FTIR和SQUID对所得产物进行表征。结果表明，NaOH在CCMNPs的形成中起关键作用。所制备的饱和磁化强度为16.5 emu / g的CCMNPs被用作磁性纳米吸附剂，用于从水溶液中去除有毒的Cu（Ⅱ）和Cr（Ⅵ）离子。研究了影响重金属离子吸附的因素，如pH值，搅拌时间和初始金属浓度。 CCMNPs对Cu（Ⅱ）和Cr（Ⅵ）的最大吸附量分别为22.6和15.4 mg / g。还研究了CCMNPs对二元溶液中Cu（Ⅱ）和Cr（Ⅵ）的竞争吸附，结果表明Cu（Ⅱ）与CCMNPs之间的亲和力远高于Cr（Ⅵ）与CCMNPs之间的亲和力。

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