磁性海藻生物炭制备及高效去除水中甲基橙的应用

Preparation of magnetic seaweed biochar and its application for efficient removal of methyl orange from aqueous solutions

采用原位沉淀法制备磁性海藻生物炭复合材料,考察复合材料对水中偶氮染料甲基橙的吸附/氧化去除效果,利用扫描电子显微镜、透射电子显微镜、傅里叶交换红外光谱、N2吸附脱附仪、X射线衍射仪和磁强计等对复合材料进行表征,考察材料投加量、H_(2)O_(2)投加量、pH和温度等条件对去除效果的影响。实验结果表明,复合材料孔隙发达,比表面积达到388.56 m^(2)/g,具有超顺磁性,磁化强度为31.38 emu/g;复合材料去除甲基橙的最佳条件:材料投加量为5 mg,H_(2)O_(2)投加量为50μL,初始pH为3,温度为35℃。磁性海藻生物炭复合材料去除甲基橙表现出催化降解和吸附的协同作用,甲基橙的去除率可达99.4%。制备的磁性海藻生物炭复合材料具有稳定、易磁分离和重复利用性好的优点,有开发成为新型水处理剂的潜力。

Magnetic seaweed biochar composite was prepared by in-situ precipitation method and used to remove the pollutant methyl orange(MO) by adsorption and catalytic oxidation from polluted water.The samples were characterized by scanning electron microscopy(SEM),transmission electron microscope(TEM),Fourier transform infrared spectroscopy(FTIR),nitrogen adsorption isotherms(BET),X-ray powder diffractometer(XRD) and vibrating sample magnetometer(VSM),and the catalytic oxidation of methyl orange by the composite was studied.The results showed that the composite has rough surface,well-developed pore structure,and superparamagnetism,with specific surface area of 388.56 m^(2)/g,and magnetization of 31.38 emu/g.The best degradation conditions were as follow:the biochar composite dosage of 5 mg,H_(2)O_(2)dosage of 50μL,the initial pH of 3,and the temperature 35℃.The biochar composite has a synergistic effect between catalytic degradation and adsorption,giving rise to the removal rate of MO of 99.4%.Therefore it has the potential to be developed as a new water treatment chemicals,due to the advantages of stability,easy magnetic separation and good reusability.