Rapid selective separation and recovery of a specific target dye from mixture consisted of different dyes by magnetic Ca-ferrites nanoparticles
Rapid selective separation and recovery of a specific target dye from mixture consisted of different dyes by magnetic Ca-ferrites nanoparticles
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DOI：
10.1016/j.cej.2014.10.002
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发表时间：
2015-02
影响因子：
15.1
通讯作者：
Xueyan Liu;Shuai An;Wang Yuejiao;Qi Yang;Lei Zhang
中科院分区：
文献类型：
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作者：
Xueyan Liu;Shuai An;Wang Yuejiao;Qi Yang;Lei Zhang
采用溶胶-凝胶法制备了CaFe 2 O 4磁性纳米粒子（MNP），该磁性纳米粒子对阴离子刚果红（CR）具有良好的亲和性，可用于从三元染料体系中选择性吸附CR，且分离因子较高。详细揭示了选择性的机理。考察了pH值、离子强度和共存离子对选择性吸附的影响。吸附过程符合准二级动力学模型。吸附数据可以很好地解释的Langmuir模型。热力学参数反映了吸附过程的自发性、放热性和物理性。用乙醇/Na_3PO_4（2 mM）（1/1，v/v）可快速回收被选择性吸附的CR染料，回收率为96.6%。再生后的吸附剂在5次再生去除循环后仍表现出对CR的高选择性吸附能力和较强的抗干扰能力，证实了CaFe 2 O 4 MNP作为含染料废水处理的实用选择性吸附剂的潜力。
A novel adsorbent of CaFe2O4magnetic nanoparticles (MNPs) which was synthesized by sol–gel process, showed an excellent high affinity to anionic congo red (CR), and could be employed to selectively adsorb CR from ternary dye system with a high separation factor. The mechanism of the selectivity was revealed in detail. The effects of various parameters such as pHs, ionic strengths and coexisting ions on the selective adsorption were investigated. The CR adsorption followed pseudo-second-order kinetic model. The sorption data could be well interpreted by the Langmuir model. The thermodynamic parameters showed the spontaneous, exothermic and physical nature of the adsorption process. The selectively adsorbed CR dye could be recovered rapidly by ethanol/Na3PO4(2 mM) (1/1, v/v) with the recovery percentage of 96.6%. The regenerated adsorbent still showed a highly selective adsorption capacity for CR after five regeneration-removal cycles and a strong anti-interference ability, confirming the potential of the CaFe2O4MNPs as practical selective adsorbent for treatments of dye containing effluents.