Activation of peroxymonosulfate by nitrogen-functionalized sludge carbon for efficient degradation of organic pollutants in water
Activation of peroxymonosulfate by nitrogen-functionalized sludge carbon for efficient degradation of organic pollutants in water
复制标题
氮功能化污泥炭活化过一硫酸盐高效降解水中有机污染物
DOI：
10.1016/j.biortech.2017.05.102
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发表时间：
2017
影响因子：
11.4
通讯作者：
Fang Jingyun
中科院分区：
文献类型：
--
作者：
Sun Hongwei;Peng Xingxing;Zhang Shuping;Liu Shengwei;Xiong Ya;Tian Shuanghong;Fang Jingyun
氮功能化污泥碳（NSC）是通过尿素介导的污水污泥（SS）热解制备的，并首次被引入作为潜在的无金属催化剂来活化过一硫酸盐（PMS）以氧化去除水中的有机污染物。 NSC催化剂的氮功能化显着影响了化学微环境以及微观结构（形态和孔隙率），提高了PMS的活化活性，以去除各种污染物，例如酸性橙7、苯酚和罗丹明B。基于猝灭研究和电子顺磁共振，澄清了NSC/PMS系统中形成的主要活性氧化物种（ROS）是非自由基单线态氧，除了典型的自由基ROS、硫酸盐和羟基自由基。 NSC框架中掺入的吡啶N、石墨N和原始C双键O促进了ROS的产生。这项研究为环保资源 SS 和开发新型经济高效的无金属催化剂进行 PMS 活化提供了新的见解。
Nitrogen-functionalized sludge carbon (NSC) was prepared by urea-mediated pyrolysis of sewage sludge (SS) and was introduced, for the first time, as a potential metal-free catalyst to activate peroxymonosulfate (PMS) for oxidative removal of organic pollutants in water. The nitrogen functionalization of NSC catalysts significantly affected the chemical micro-environments as well as microstructures (morphology and porosity), improving the PMS activation activity towards removing various pollutants,e.g., acid orange 7, phenol and rhodamine B. On the basis of quenching studies and electron paramagnetic resonance, the formed dominant reactive oxidative species (ROS) in the NSC/PMS system was clarified to be nonradical singlet oxygen, in addition to the typical radical ROSs, sulfate and hydroxyl radicals. The incorporated pyridine N, graphite N and pristine Cdouble bondO in the NSC framework promoted the generation of ROS. This study provided new insights into environmentally friendly resourcing SS and exploiting novel cost-effective metal-free catalyst for PMS activation.