Huang Ruixiong, Fang Zhanqiang, Fang Xiaobo, Tsang Eric Pokeung
School of Chemistry and Environment, South China Normal University, Guangzhou 51006, China; Department of Environmental Monitoring, Guangdong Vocational College of Environmental Protection Engineering, Foshan 528216, China.
School of Chemistry and Environment, South China Normal University, Guangzhou 51006, China; Guangdong Technology Research Center for Ecological Management and Remediation of Urban Water System, Guangzhou 51006, China.
J Colloid Interface Sci. 2014 Dec 15;436:258-66. doi: 10.1016/j.jcis.2014.08.035. Epub 2014 Sep 16.
In this study, Fe3O4 NPs (named as Fe3O4 NPs-PO) were prepared by steel pickling waste liquor to reduce the cost of preparation, and were compared with those obtained by the common co-precipitation method (named as Fe3O4 NPs-CP) which prepared from chemical reagent using BET, XRD, XPS, TEM and SEM techniques. The results indicated that Fe3O4 NPs-PO nanoparticles mainly existed in the form of Fe3O4 and appeared to be roughly spherical in shape with a size range of 20-50 nm. The heterogeneous Fenton-like catalytic capacity of Fe3O4 NPs-PO in US+Fe3O4+H2O2 system was comprehensively investigated. BPA could be degraded within a wide pH range of 7-10. The removal efficiencies of BPA were close to 100% and about 45% total organic carbon (TOC) in solution was eliminated at the optimized conditions. It was found that ·OH radicals which mainly caused the degradation of BPA were promptly generated due to the catalysis of the Fe3O4 NPs-PO. Furthermore, the comparative study of catalytic activity, stability and reusability between Fe3O4 NPs-PO and Fe3O4 NPs-CP showed that the two catalysts both remained good activity after several reaction cycles and no significant change in composition and structure was observed, the loss of catalyst was negligible, which demonstrated that Fe3O4 NPs-PO were promising in ultrasonic Fenton-like process to treat refractory organics.
在本研究中，利用钢酸洗废液制备了Fe3O4纳米颗粒（命名为Fe3O4 NPs-PO）以降低制备成本，并将其与通过共沉淀法由化学试剂制备的Fe3O4纳米颗粒（命名为Fe3O4 NPs-CP）进行比较，采用BET、XRD、XPS、TEM和SEM技术进行表征。结果表明，Fe3O4 NPs-PO纳米颗粒主要以Fe3O4的形式存在，呈大致球形，尺寸范围为20-50nm。全面研究了Fe3O4 NPs-PO在US+Fe3O4+H2O2体系中的非均相类芬顿催化能力。双酚A（BPA）在7-10的宽pH范围内可被降解。在优化条件下，BPA的去除效率接近100%，溶液中约45%的总有机碳（TOC）被去除。发现由于Fe3O4 NPs-PO的催化作用，主要导致BPA降解的·OH自由基迅速产生。此外，对Fe3O4 NPs-PO和Fe3O4 NPs-CP的催化活性、稳定性和可重复使用性的比较研究表明，两种催化剂在几个反应循环后均保持良好活性，未观察到组成和结构的明显变化，催化剂损失可忽略不计，这表明Fe3O4 NPs-PO在超声类芬顿法处理难降解有机物方面具有应用前景。
