Laboratório de Catálise Ambiental e Novos Materiais, Departamento de Química, Universidade Federal de Lavras, CEP 37200-000, Lavras, MG, Brazil.
Laboratório de Química, Departamento de Química, Universidade Federal de Itajubá, Centro Universitário de Itajubá, CEP 37500-903, Itajubá, MG, Brazil.
Sci Rep. 2019 Sep 6;9(1):12819. doi: 10.1038/s41598-019-49196-9.
The present study refers to the use of an environmental pollutant generated during the removal of hexavalent chromium from aqueous media. This pollutant is a material with catalytic properties suitable for application in the oxidative degradation of problematic organic compounds. The material, initially used as an adsorbent, is a composite prepared by modifying the crystalline phases of iron oxides together with the chitosan (CT-FeCr). Chemical and morphological characterizations of the materials were performed using SEM analysis coupled with EDS, XRD and DSC. The CT-FeCr beads were used in the degradation of methylene blue dye (MB) and showed excellent degradation potential (93.6%). The presence of Cr on the surface of the catalyst was responsible for the increase in catalytic activity compared to the CT-Fe and pure magnetite materials. The product of the effluent treatment and the presence of the catalyst itself in the environment do not pose toxic effects. In addition, the CT-FeCr beads showed catalytic stability for several consecutive reaction cycles with possible technical and economic viability. The concept of "industrial symbiosis" may be applied to this technology, with that term relating to the reuse of a byproduct generated in one particular industrial sector by another as a raw material.
本研究涉及到从水介质中去除六价铬时产生的一种环境污染物的使用。这种污染物是一种具有催化性能的材料，适用于氧化降解有问题的有机化合物。该材料最初用作吸附剂，是通过改性氧化铁的晶相与壳聚糖（CT-FeCr）制备的复合材料。使用 SEM 分析与 EDS、XRD 和 DSC 对材料进行了化学和形态学表征。CT-FeCr 珠用于降解亚甲基蓝染料（MB），表现出优异的降解潜力（93.6%）。与 CT-Fe 和纯磁铁矿材料相比，催化剂表面上的 Cr 的存在导致催化活性增加。废水处理的产物和催化剂本身在环境中的存在不会产生毒性影响。此外，CT-FeCr 珠在几个连续的反应循环中表现出催化稳定性，具有潜在的技术和经济可行性。“工业共生”的概念可以应用于这项技术，该术语涉及到将一个特定工业部门产生的副产品再用作另一个部门的原材料。
