Guangdong Provincial Engineering and Technology Research Center for Agricultural Land Pollution Prevention and Control, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China.
Key Laboratory of Agricultural Green Fine Chemicals of Guangdong Higher Education Institution, School of Chemistry and Chemical Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China.
J Hazard Mater. 2021 Aug 15;416:125930. doi: 10.1016/j.jhazmat.2021.125930. Epub 2021 Apr 28.
The pollution of heavy metals and organic compounds has received increased attention in recent years. In the current study, a novel biochar-based iron oxide composite (FeYBC) was successfully synthesized using pomelo peel and ferric chloride solution through one-step process at moderate temperature. Results clearly demonstrate that FeYBC exhibited more efficient removal of Cr(VI) and/or phenol compared with the pristine biochar, and the maximum adsorption amounts of Cr(VI) and phenol by FeYBC could reach 24.37 and 39.32 mg g, respectively. A series of characterization data suggests that several iron oxides such as FeO, Fe, FeOOH and FeO were formed on the FeYBC surface as well as oxygen-containing groups. Thermodynamics study indicates that Cr(VI) and phenol adsorption by FeYBC were endothermic and exothermic processes, respectively. Langmuir adsorption isotherm and pseudo-second order models could better explain the Cr(VI) and phenol adsorption behaviors over FeYBC. The Cr(VI) adsorption might be primarily achieved through the ion exchange and surface complexation and reduction, whereas the π-π interaction and electron donor-acceptor complex mainly contributed to phenol adsorption. The findings indicate that the biochar-based iron oxide composites material was an efficient adsorbent for the remediation of industrial effluents containing Cr(VI) and phenol.
近年来，重金属和有机化合物的污染受到了越来越多的关注。在本研究中，通过一步法在中等温度下使用柚子皮和氯化铁溶液成功合成了一种新型的基于生物炭的氧化铁复合材料（FeYBC）。结果清楚地表明，与原始生物炭相比，FeYBC 对 Cr(VI) 和/或苯酚具有更高的去除效率，FeYBC 对 Cr(VI) 和苯酚的最大吸附量分别可达 24.37 和 39.32 mg/g。一系列特征化数据表明，FeYBC 表面形成了几种氧化铁，如 FeO、Fe、FeOOH 和 FeO 以及含氧基团。热力学研究表明，Cr(VI) 和苯酚在 FeYBC 上的吸附分别是吸热和放热过程。Langmuir 吸附等温线和准二级模型可以更好地解释 Cr(VI) 和苯酚在 FeYBC 上的吸附行为。Cr(VI) 的吸附可能主要通过离子交换、表面络合和还原来实现，而 π-π 相互作用和电子供体-受体络合主要有助于苯酚的吸附。这些发现表明，基于生物炭的氧化铁复合材料是一种有效去除工业废水中 Cr(VI) 和苯酚的吸附剂。
