Activation of peroxymonosulfate by nitrogen-functionalized sludge carbon for efficient degradation of organic pollutants in water. (October 2017)

• Record Type: Journal Article
• Authors: Sun, Hongwei; Peng, Xingxing; Zhang, Shuping; Liu, Shengwei; Xiong, Ya; Tian, Shuanghong; Fang, Jingyun
• Is Part Of: Bioresource technology. Volume 241(2017)
• Page Start: 244
• Page End: 251
• Publication Date: 2017-10
• Subjects: AC activated carbon -- ACF activated carbon fiber -- AO7 acid orange 7 -- DMPO 5, 5-dimethyl-1-pyrroline -- EDX energy dispersive X-ray spectrometry -- EPR electron paramagnetic resonance -- ICP-OES inductively coupled plasma optical emission spectrometry -- NSC nitrogen-functionalized sludge carbon -- NSC-700-X NSC prepared with varied mass ratio of urea to sludge carbon (X) under 700 °C -- 1O2 singlet oxygen -- OH hydroxyl radical -- ORR oxygen reduction reactions -- PAC powered activated carbon -- pHPZC pH at the point of zero charge -- PMS peroxymonosulfate -- Rh B rhodamine B -- R-NSC regenerated NSC-700-2 -- ROS reactive oxidative species -- SBET specific surface area -- SC sludge carbon -- SEM scanning electron microscope -- SS sewage sludge -- SO4− sulfate radical -- TBA tert-butanol -- TEM transmission electron microscope -- TMP 2, 2, 6, 6-tetramethyl-4-piperidone -- WTP wastewater treatment plants -- XPS X-ray photoelectron spectroscopy -- XRD X-ray diffraction; Peroxymonosulfate -- Singlet oxygen -- Sewage sludge-derived carbon -- Metal-free catalysts -- Nitrogen-functionalization; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2017.05.102
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Nitrogen-functionalized sludge carbon (NSC) was prepared. NSC was active for peroxymonosulfate (PMS) activation. Singlet oxygen was dominant reactive oxidative species in NSC/PMS system. Pyridine N, graphite N and pristine CO in the NSC framework are crucia Abstract: 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 CO 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.