含锌富铁矿物材料催化非均相Fenton反应对水中OG的脱色降解研究

从含铁工业固体废渣中分离出来一种含锌富铁矿物材料(WMT)作为非均相Fenton催化剂,并深入研究WMT对水中偶氮染料橙黄G (orange G, OG) 的催化Fenton氧化脱色降解性能。采用批处理氧化实验方法,探讨在不同条件下WMT对水中OG非均相Fenton氧化脱色降解的效果差异,确定优化工艺参数。研究表明,WMT催化的OG非均相Fenton脱色降解,主要表现为在暗反应下大都遵循零级动力学模型(R²>0.96),但在可见光条件下却遵循伪一级动力学模型(R²>0.97)。而且,WMT具有很好的非均相光-Fenton催化性能。因此,WMT是一种潜在的并可供选择的对OG去除的非均相光-Fenton催化剂。

Decolorization and degradation of aqueous OG by using zinc-bearing iron-rich mineral material as a heterogeneous Fenton catalyst

The zinc-bearing iron-rich mineral material (wasted magnetite, WMT) was separated from an iron-rich industrial solid waste. This WMT was applied as a heterogeneous Fenton catalyst to investigate decolorization and degradation of the azo-dye orange G (OG) in wastewater. The Fenton catalytic activity of WMT was explored in batch experiments conducted under varying conditions with the emphasis placed on the evaluation of the performance properties via their Fenton process optimization. The result showed that WMT-catalyzed heterogeneous Fenton reactions mostly followed zero-order kinetic model (R²>0.96) in dark irradiation, and followed pseudo-first-order kinetic model (R²>0.97) in visible irradiation. Moreover, WMT represented good heterogeneous photo-Fenton catalytic activity for the OG oxidative removal in the process. It is suggested that WMT may be a potential heterogeneous photo-Fenton catalyst available for the removal of the azo-dyes under the irradiation condition.