In-situ Fe-doped g-C3N4 heterogeneous catalyst via photocatalysis-Fenton reaction with enriched photocatalytic performance for removal of complex wastewater
In-situ Fe-doped g-C3N4 heterogeneous catalyst via photocatalysis-Fenton reaction with enriched photocatalytic performance for removal of complex wastewater
复制标题
原位Fe掺杂g-C3N4多相催化剂通过光催化-Fenton反应具有丰富的光催化性能去除复杂废水
DOI：
10.1016/j.apcatb.2018.12.029
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发表时间：
2019-05-15
影响因子：
22.1
通讯作者：
Cui, Wenquan
中科院分区：
文献类型：
--
作者：
Hu, Jinshan;Zhang, Pengfei;Cui, Wenquan
采用热收缩聚合法原位合成了Fe掺杂的g-C3 N4催化剂。在可见光照射下，加入H2 O2形成的非均相光催化-Fenton体系对苯酚、双酚A、2，4-二氯苯酚和焦化废水等难降解污染物具有良好的去除效果，且可循环使用，这是由于Fe-g-C3 N4的三嗪环骨架中的Fe和N元素形成了13-n键。产生的电子在化学键的相互作用下可以迅速转移到Fe 3+上形成Fe 2+。Fe ~（2+）与H_2O_2的反应加速了光电子的分离，并迅速产生了OH自由基。具体地说，在非均相体系中实现了Fe的循环利用，避免了均相芬顿反应中Fe离子的循环利用和二次污染问题。优化了Fe掺杂量、H2 O2浓度、pH值、催化剂浓度、复合废水（焦化废水）等工艺参数。对焦化废水进行了降解实验，300 ml焦化废水的COD和TOC值在60 min内分别从64.6和25.3 mg/L降至22.8和12.3 mg/L。这些结果表明，Feg-C3 N4催化剂的光催化-Fenton反应是有希望的环境修复。
In this work, an in-situ Fe-doped g-C3N4 catalyst was synthesized by thermal shrinkage polymerization. A heterogeneous photocatalysis-Fenton system was formed with the addition of H2O2 under visible irradiation and exhibited excellent and recyclable removal performance for refractory contaminants such as: phenol, bisphenol A, 2, 4-dichlorophenol and coking wastewater, which was due to the formation of 13-n bonds via Fe and N element in the triazine ring skeleton of Fe-g-C3N4. The electrons generated can be quickly transferred to Fe3 + to form Fe2+ under the interaction of the chemical bond. The efficiency of photoelectron separation was accelerated, and 'OH radicals were quickly generated with the reaction between Fe2+ and H2O2. Specifically, the recycling of Fe can be achieved in the heterogeneous system, which avoids the problems for the recycling and secondary pollution of Fe ions in homogeneous Fenton reaction. Parameters such as Fe doping amount, hydrogen peroxide concentration, pH value, catalyst concentration, and complex wastewater (coking wastewater) were optimized. The degradation of coking wastewater were also performed, and the chemical oxygen demand (COD) and total organic carbon (TOC) values for 300 ml coking wastewater could be reduced from 64.6 and 25.3 mg/L to 22.8 and 12.3 mg/L in 60 min, respectively. These results demonstrate photocatalysis-Fenton reaction with Feg-C3N4 catalyst is promising for environmental remediation.