A novel heterogeneous photo-Fenton catalyst, iron coated sand (Fe-sand) was synthesized by impregnation-calcination method. The catalyst Fe-sand was characterized by XRD, BET, SEM, TEM, FTIR, XRF and DRS methods. X-ray diffraction (XRD) analysis showed that the Fe-sand catalyst mainly consists of Fe₂O₃ and SiO₂ crystallites, and the Fe concentration of the prepared catalyst measured by AAS is 135.7 mg/g. BET results revealed that Fe-sand possess a mesoporous structure with a porosity of 23%. The catalytic performance of the Fe-sand was studied in the discoloration and mineralization of methyl orange (MO). The influence of reacting conditions on degradation efficiency of the oxidation process was analyzed. At optimal conditions (200 mg/L of H₂O₂, 100 mg/L of initial MO concentration, pH = 3 and without added alcohol) complete discoloration of MO can be obtained within 60 min. The reaction process of MO discoloration was followed by UV–vis and GC–MS spectroscopic techniques. Based on the oxidation products formed, a probable degradation mechanism has been distinguished. Leaching tests indicated a very low concentration of dissolved iron ion and satisfactory stability of prepared catalyst. Industrial application of this catalyst in textile effluent treatment has shown that the proposed catalytic process is suitable for producing reusable water quality.

通过浸渍-煅烧法合成了新型的非均相光Fenton催化剂，铁包砂（Fe-砂）。用XRD，BET，SEM，TEM，FTIR，XRF和DRS对Fe-砂进行了表征。X射线衍射（XRD）分析表明，铁砂催化剂主要由Fe ₂ O ₃和SiO ₂微晶组成，AAS法测得的Fe浓度为135.7 mg / g。BET结果表明，铁砂具有介孔结构，孔隙率为23％。研究了铁砂在甲基橙（MO）的变色和矿化中的催化性能。分析了反应条件对氧化过程降解效率的影响。在最佳条件下（200 mg / L H ₂O _2为100 mg / L的初始MO浓度，pH = 3，且未添加醇），可在60分钟内使MO完全脱色。MO变色的反应过程是通过UV-vis和GC-MS光谱技术进行的。基于形成的氧化产物，已区分出可能的降解机理。浸出试验表明，溶解的铁离子浓度非常低，制得的催化剂具有令人满意的稳定性。该催化剂在纺织废水处理中的工业应用表明，所提出的催化方法适合于产生可重复使用的水质。