Chemistry Department, Federal University of Sergipe (UFS), 49100-000 São Cristóvão, SE, Brazil.
Chemistry Department, Federal University of Sergipe (UFS), 49100-000 São Cristóvão, SE, Brazil.
J Hazard Mater. 2017 Jul 15;334:76-85. doi: 10.1016/j.jhazmat.2017.03.062. Epub 2017 Mar 31.
This work describes the removal of chromium ions from industrial effluent using a hybrid magnetic adsorbent, CoFeO/NOM, synthesized using water rich in natural organic matter. The hybrid obtained at ambient temperature (HbAmb) was calcined at 200, 400, and 800°C for 2h, and formation of the cobalt ferrite phase was confirmed by XRD, which indicated the presence of NOM in the structure of the material. Removal tests showed that HbAmb provided efficient removal of chromium at the natural pH of the effluent, while the other materials were effective at pH 6. Evaluation of the kinetics showed excellent performance of the process, with 70-87% removal in 20min, which provided a high degree of flexibility. The hybrid showed high removal during five reuse cycles, ranging from 96% in the first cycle to 82% in the final. The matrices containing the saturated adsorbent (HbAmb_Sat) and recovered chromium ions (CrD) showed high performance in the catalytic reduction of 4-nitrophenol, with conversion rates of 99.9% in short periods of time, as well as excellent potential for reuse in three cycles. The results demonstrated that the production of a technological material and its use for remediation could be achieved in an ecologically sustainable manner.
这项工作描述了使用一种混合磁性吸附剂 CoFeO/NOM 从工业废水中去除铬离子，该吸附剂是用水富含有机物质合成的。在环境温度下获得的混合物（HbAmb）在 200、400 和 800°C 下煅烧 2 小时，XRD 证实了钴铁氧体相的形成，表明材料结构中存在 NOM。去除试验表明，HbAmb 在废水的自然 pH 下提供了对铬的有效去除，而其他材料在 pH 6 时有效。动力学评估表明该过程具有出色的性能，在 20 分钟内可实现 70-87%的去除率，具有很高的灵活性。该混合物在五个再利用循环中表现出高去除率，从第一个循环的 96%到最后一个循环的 82%。含有饱和吸附剂（HbAmb_Sat）和回收铬离子（CrD）的基质在 4-硝基苯酚的催化还原中表现出优异的性能，在短时间内转化率达到 99.9%，并且在三个循环中有很好的再利用潜力。结果表明，可以以生态可持续的方式生产技术材料并将其用于修复。
