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Abstract：
The composite photocatalyst FeOOH/g-C3N4 was prepared through thermal polycondensation and co-precipitation methods, followed by XRD, SEM and UV-vis characterization. The stability of FeOOH/g-C3N4 was explored by the recycling test. The active species in the reaction system were investigated by the capture experiment. The results indicated that the optimal preparation condition for g-C3N4 involved calcination at 600 °C for 4 h. XRD analysis revealed that g-C3N4 exhibits a high-purity phase, and Fe in FeOOH/g-C3N4 exists in a highly dispersed amorphous state. SEM analysis showed that FeOOH/g-C3N4 has a rough surface with an irregular layered structure. Element composition analysis confirmed that the content of elements in the prepared catalyst is consistent with the theoretical calculation. FeOOH/g-C3N4 possesses the largest specific surface area of 143.2 m2/g and a suitable pore distribution. UV-vis DRS analysis showed that the absorption intensity of FeOOH/g-C3N4 is stronger than that of g-C3N4. When the catalyst dosage was 1.0 g/L, the H2O2 dosage was 4 mmol/L, the PNP initial concentration was 10 mg/L and the initial pH value was 5, the PNP removal could reach 92% in 120 min. Even after 5 cycles, the efficiency of PNP removal by FeOOH/g-C3N4 remains nearly 80%. The capture experiment indicated that both •OH and •O2- play roles in the photocatalytic degradation of PNP, with •OH being more significant. These findings affirm that FeOOH has been successfully incorporated into g-C3N4, resulting in a conspicuous catalytic effect on the degradation of PNP in the visible light-assisted Fenton-like reaction.
摘要：
通过热缩聚和共沉淀法制备了FeOOH/g-C3N4复合光催化剂,其次是XRD，SEM和UV-vis表征。通过回收试验探索了FeOOH/g-C3N4的稳定性。通过捕获实验研究了反应体系中的活性物种。结果表明，g-C3N4的最佳制备条件是在600°C下煅烧4h。XRD分析表明，g-C3N4具有高纯度相，FeOOH/g-C3N4中的Fe以高度分散的非晶态存在。SEM分析表明，FeOOH/g-C3N4具有粗糙的表面，具有不规则的层状结构。元素组成分析证实制备的催化剂中元素含量与理论计算相符。FeOOH/g-C3N4具有143.2m2/g的最大比表面积和合适的孔分布。UV-visDRS分析表明，FeOOH/g-C3N4的吸收强度强于g-C3N4。当催化剂用量为1.0g/L时,H2O2用量为4mmol/L,PNP初始浓度为10mg/L,初始pH值为5时,PNP去除率在120min内可达到92%。即使经过5个周期，FeOOH/g-C3N4对PNP的去除效率保持近80%。捕获实验表明，·OH和·O2-都在PNP的光催化降解中起作用，·OH更重要。这些发现证实了FeOOH已成功掺入g-C3N4中，从而在可见光辅助的类Fenton反应中对PNP的降解产生了显着的催化作用。
