易回收Co_3O_4/氧化石墨烯/氧化纤维素的制备及其对染料降解的研究

Synthesis of easy recoverable Co_3O_4/GO/TOCNs and its performance in degradation of dye

针对Co_3O_4/氧化石墨烯(GO)纳米复合催化剂粒径小、不易回收的问题,通过溶液共混法将Co_3O_4/GO与氧化纤维素(TOCNs)复合,制备出粒径约为5mm的新型复合催化剂Co_3O_4/GO/TOCNs。采用X射线衍射仪(XRD)、傅立叶变换红外光谱仪(FT-IR)、扫描电子显微镜(SEM)等对其进行表征,并催化单过硫酸氢钾(PMS)降解酸性橙Ⅱ。实验结果表明:Co_3O_4/GO/TOCNs的催化性能与Co_3O_4/GO一致且可自沉淀回收,稳定性良好,循环使用过程中Co溶出质量浓度均保持在0.1mg/L以下;当酸性橙Ⅱ初始摩尔浓度为0.2mmol/L,PMS投加量为2.00mmol/L,Co_3O_4/GO/TOCNs投加量为0.50g/L,温度为25℃,pH=7时,酸性橙Ⅱ可在6min内完全降解。

Due to small size of Co3O4/graphene oxide（GO）and difficulty in recycling,oxycellulose nanofibers（TOCNs）were used as the carrier of Co3O4/GO to synthesized composite catalyst（Co3O4/GO/TOCNs）of about 5 mm in size with solution mixing method.The newly developed composite material Co3O4/GO/TOCNs was characterized by X-ray diffraction（XRD）,Fourier transform infrared spectrometer（FT-IR）and scanning electron microscope（SEM）,and used to catalyze peroxymonosulfate（PMS）to degrade acid orangeⅡ.The experimental results revealed that the catalytic performance of Co3O4/GO/TOCNs was consistent with Co3O4/GO and showed stable self-precipitation recovery.The Co dissolution rate was kept under 0.1 mg/L during the recycling process.Acid orangeⅡ degradation experiments were found to be optimum removal within 6 min when using PMS dose was 2.00 mmol/L,Co3O4/GO/TOCNs dose was 0.50 g/L and pH=7 for 0.2 mmol/L acid orangeⅡ at 25 ℃.