Preparation and application of BiFeO3-plant fiber visible light catalytic material

In recent years, Advanced Oxidation processes (AOPs) possesses obvious advantages in removing organic pollutants from environmental media, causing widespread concern among researchers in related research fields around the world. In advanced oxidation technologies, the combination of several oxidation technologies can combine the advantages of these oxidation technologies to achieve higher catalytic efficiency. BiFeO3 is a kind of bismuth-based catalytic material, with a bandgap energy value of 2.1 eV. It possesses high visible light catalytic activity, which greatly improves the utilization of light energy. Except that, it also possesses heterogenetic Fenton-like catalytic ability, which resulting in generating strong oxidative actives. This heterogeneous Fenton system not only can improve the catalytic performance of iron-containing catalysts, but also can recycle the catalysts, reduce the secondary pollution of iron mud in the reaction system, and greatly reduce the pressure of environmental pollution. In this paper, the BiFeO3 composite catalyst was prepared through loading BiFeO3 nanoparticles on plant fibres. The way of loading makes the composite catalyst better to be recycled and the catalytic effect of the composite was explored. The organic contaminant Congo red was selected as the substrate. The degraded kinetic process of Congo red was explored. And the effect of catalyst load, H2O2 dosage and pH value on the degradation of Congo red was explored. It was found that 96% of Conge red was degraded under the optimal reactive condition (the ratio of BiFeO3 and fibre: 1:1, catalyst load: 0.8g L⁻¹, H2O2 concentration: 15mmol L⁻¹, and pH 6). This provides a certain theoretical and practical value for the degradation of organic pollutants. At the same time, it also provides a certain reference value for the recycling of resources and its sustainable development.