Abstract In this work, using bentonite as support, a new composite of bentonite-based bismuth ferrites (BFOs/Bent) which can be used as a catalyst for photo-Fenton reaction under visible light has been synthesized. The optimum synthesis conditions of BFOs/Bent were obtained, and the optimum synthesis conditions of BFOs/Bent were as follows: molar ratio of Fe(NO3)3 to Bi(NO3)3 (MFe/MBi) 1:1, dosage of Fe3+ to bentonite (MFe/mBent) 5 mmol/g, calcination temperature 500 °C, and calcination time 2 h. The catalysts prepared at different synthesis conditions were characterized, and based on the characterizations, the effects from the synthesis conditions on the physicochemical properties of BFOs/Bent were analyzed. The characterization results showed the functional components of bismuth ferrites were successfully immobilized on the bentonite, and the crystalline phases in the optimum BFOs/Bent (labeled as BiFeO3-Bi2Fe4O9/Bent) were BiFeO3 and Bi2Fe4O9. BiFeO3-Bi2Fe4O9/Bent showed good response to visible light as well as to UV light. Large specific surface area and macroporous volume were contributed to the high catalytic activity of BiFeO3-Bi2Fe4O9/Bent. It was further found that the low band gap and the effective charge separation at heterojunction were the basis for the high photocatalytic activity of BiFeO3-Bi2Fe4O9/Bent.

中文翻译：

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一种对可见光具有良好响应的膨润土基铁酸铋催化复合材料用于光芬顿反应：制备、表征和理化变化分析

摘要 在这项工作中，以膨润土为载体，合成了一种新的膨润土基铁酸铋复合材料（BFOs/Bent），可用作可见光下光芬顿反应的催化剂。得到了BFOs/Bent的最佳合成条件，BFOs/Bent的最佳合成条件为：Fe(NO3)3与Bi(NO3)3摩尔比(MFe/MBi)1:1，Fe3+用量膨润土 (MFe/mBent) 5 mmol/g，煅烧温度 500 °C，煅烧时间 2 h。对不同合成条件下制备的催化剂进行了表征，并基于表征分析了合成条件对BFOs/Bent理化性质的影响。表征结果表明，铁酸铋的功能组分成功固定在膨润土上，最佳 BFOs/Bent（标记为 BiFeO3-Bi2Fe4O9/Bent）的结晶相为 BiFeO3 和 Bi2Fe4O9。BiFeO3-Bi2Fe4O9/Bent 对可见光和紫外光表现出良好的响应。大比表面积和大孔体积有助于 BiFeO3-Bi2Fe4O9/Bent 的高催化活性。进一步发现，低带隙和异质结处的有效电荷分离是 BiFeO3-Bi2Fe4O9/Bent 高光催化活性的基础。