Xu Jia, Ma Qianhui, Feng Wen, Zhang Xiaopeng, Lin Qiang, You Chenghang, Wang Xianghui
Key Laboratory of Water Pollution Treatment and Resource Reuse of Hainan Province, Key Laboratory of Soil Pollution Remediation and Resource Reuse of Haikou City, College of Chemistry and Chemical Engineering, Hainan Normal University Haikou 571158 China
RSC Adv. 2022 Aug 30;12(38):24439-24446. doi: 10.1039/d2ra03545f.
Water pollution has become a serious environmental problem to date. Advanced oxidation processes (AOP) have been widely applied in water treatments. However, the traditional Fenton reaction based on the Fe-HO system has obvious drawbacks, limiting further practical applications. In this work, an FeO and nano-clothed biochar (FeO/CBc) composite was prepared through a precipitation method and used for the degradation of methyl orange (MO) in water. The FeO/CBc composite was characterized by FTIR, BET, SEM, TEM, XRD, and VSM. In addition, the adsorption/catalytic oxidation of MO were also tested. Specifically, FeO/CBc had a rough surface, abundant porous structure, high surface area of 835.82 m g, and obvious magnetization. The catalyst showed rather high performance towards MO removal. The optimal conditions for MO removal were as follows: the dosage of hydrogen peroxide was 16 mmol L, pH = 3, the temperature was 35 °C, and the addition amount of adsorbent was 10 mg. Under optimal conditions, the MO removal rate can be higher than 99%. The synergistic effect between catalytic degradation and adsorption in removing MO was also observed. Besides high performance in removing MO, FeO/CBc also exhibited high stability, easy magnetic separation, and great reusability, as well as the potential to be developed as a new heterogeneous Fenton catalyst.
迄今为止，水污染已成为一个严重的环境问题。高级氧化工艺（AOP）已广泛应用于水处理中。然而，基于Fe-HO体系的传统芬顿反应存在明显缺陷，限制了其进一步的实际应用。在本研究中，通过沉淀法制备了FeO与纳米包覆生物炭（FeO/CBc）复合材料，并将其用于水中甲基橙（MO）的降解。采用傅里叶变换红外光谱（FTIR）、比表面积分析仪（BET）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X射线衍射仪（XRD）和振动样品磁强计（VSM）对FeO/CBc复合材料进行了表征。此外，还测试了其对MO的吸附/催化氧化性能。具体而言，FeO/CBc表面粗糙，具有丰富的多孔结构，比表面积高达835.82 m²/g，且具有明显的磁性。该催化剂对MO的去除表现出相当高的性能。去除MO的最佳条件如下：过氧化氢用量为16 mmol/L，pH = 3，温度为35℃，吸附剂添加量为10 mg。在最佳条件下，MO去除率可高于99%。还观察到催化降解与吸附在去除MO过程中的协同作用。除了在去除MO方面具有高性能外，FeO/CBc还表现出高稳定性、易于磁分离、良好的可重复使用性，以及作为新型非均相芬顿催化剂开发的潜力。
