title: Characterization of ferromagnetic sludge-based activated carbon and its application in catalytic ozonation of p-chlorobenzoic acid.
abstract: In order to solve the separation problem of powdered sludge-based activated carbon (SAC), a series of novel ferromagnetic sludge-based activated carbons (FMSACs, with different iron content 2.3, 4.3, and 9.5 wt%) with a good magnetic separation ability were prepared through co-precipitation method in this study. The structure and physicochemical properties of FMSACs and their catalytic ozonation performance on the removal of p-chlorobenzoic acid (p-CBA) were investigated. The saturation magnetization (Ms) of FMSACs was determined in the range of 0.3674-5.7992 emu g-1, and experiments confirmed that these FMSACs could be easily separated by magnetic fields. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analysis indicated that magnetite and maghemite were the main magnetic phases in FMSACs. Comparing with ozonation alone and SAC catalytic ozonation, the presence of 2.3 wt% - FMSAC improved the degradation of p-CBA during catalytic ozonation from 44 and 70 to 80%. The tertiary butanol inhibition experiment indicated that FMSACs catalytic ozonation process followed hydroxyl radical reaction mechanism. Furthermore, after six repetitive catalytic ozonation runs, 2.3 wt% - FMSAC still showed relatively high catalytic activity for the removal of p-CBA. Consequently, the novel FMSACs with magnetic separation ability and catalytic performance provide a practical pathway for the sludge utilization.
authors.affiliation: Beijing Key Lab for Source Control Technology of Water Pollution, College of Environmental Science and Engineering, Beijing Forestry University, No. 35 Tsinghua East Road, Beijing, 100083, China.
authors.forename: Siying
authors.initials: S
authors.lastname: Lu
authors.affiliation: Beijing Key Lab for Source Control Technology of Water Pollution, College of Environmental Science and Engineering, Beijing Forestry University, No. 35 Tsinghua East Road, Beijing, 100083, China.
authors.forename: Yongze
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Beijing Key Lab for Source Control Technology of Water Pollution, College of Environmental Science and Engineering, Beijing Forestry University, No. 35 Tsinghua East Road, Beijing, 100083, China.
authors.forename: Li
authors.initials: L
authors.lastname: Feng
authors.affiliation: Beijing Key Lab for Source Control Technology of Water Pollution, College of Environmental Science and Engineering, Beijing Forestry University, No. 35 Tsinghua East Road, Beijing, 100083, China.
authors.forename: Zhongen
authors.initials: Z
authors.lastname: Sun
authors.affiliation: Beijing Key Lab for Source Control Technology of Water Pollution, College of Environmental Science and Engineering, Beijing Forestry University, No. 35 Tsinghua East Road, Beijing, 100083, China. zhangliqiu@163.com.
authors.forename: Liqiu
authors.initials: L
authors.lastname: Zhang
mesh_terms: D002384:Catalysis; D002606:Charcoal / Q000737:chemistry*; D005290:Ferric Compounds / Q000737:chemistry*; D060328:Magnetic Phenomena; D010126:Ozone / Q000737:chemistry*; D012722:Sewage / Q000032:analysis*; D014865:Waste Disposal, Fluid / Q000295:instrumentation / Q000379:methods*
chemical_list: D005290:Ferric Compounds; D012722:Sewage; C001215:ferrite; D002606:Charcoal; D010126:Ozone
keywords: Catalytic ozonation; Ferromagnetic sludge-based activated carbon; Magnetic catalyst; Magnetic separation; Sludge disposal; p-Chlorobenzoic acid