title: Coupling the dechlorination of aqueous 4-CP with the mechanochemical destruction of solid PCNB using Fe-Ni-SiO2.
abstract: A novel combined process was developed for mechanochemical destruction of pentachloronitrobenzene (PCNB) in solid waste, coupled with the dechlorination of aqueous 4-chlorophenol (4-CP) using the nonhazardous residue from the solid-phase destruction step. Using the mixture of iron powder, nickel powder and quartz sand as the additives in a planetary ball mill under the room temperature, the mechanochemical reaction was induced and a complete destruction of PCNB was realized. The resulting solid residue was characterized by various measures including X-ray diffraction (XRD), Raman spectroscopy and scanning electron microscopy/energy dispersive X-ray spectrometry (SEM/EDS), which suggested that main components were carbon, chloride besides excess additives. Such nonhazardous residue was then used to effectively dechlorinate aqueous 4-CP. The residue achieving over 93% dechlorination rate was selected as the optimized content. With a series of verification experiments, a possible dechlorination mechanism was proposed, involving the reactions occurred on three interfaces (i.e. Fe/Ni, Fe/C and Fe/C/Ni).
authors: State Key Joint Laboratory of Environment Simulation and Pollution Control (SKJLESPC), School of Environment, POPs Research Center, Tsinghua University, Beijing 100084, PR China.
authors: Teng
authors: T
authors: Zhang
authors: Jun
authors: J
authors: Huang
authors: Wang
authors: W
authors: Zhang
authors: Yunfei
authors: Y
authors: Yu
authors: Shubo
authors: S
authors: Deng
authors: Bin
authors: B
authors: Wang
authors: Gang
authors: G
authors: Yu
mesh_terms: D002713:Chlorine / Q000737:chemistry*; D002733:Chlorophenols / Q000737:chemistry*; D006219:Halogens / Q000737:chemistry; D007501:Iron / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D009532:Nickel / Q000737:chemistry; D009578:Nitrobenzenes / Q000737:chemistry* / Q000302:isolation & purification*; D009584:Nitrogen / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry; D013052:Spectrometry, X-Ray Emission; D013059:Spectrum Analysis, Raman; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D014876:Water Pollution; D018508:Water Purification / Q000379:methods; D014961:X-Ray Diffraction
chemical_list: D002733:Chlorophenols; D006219:Halogens; D009578:Nitrobenzenes; D014874:Water Pollutants, Chemical; C029107:4-chlorophenol; D002713:Chlorine; D012822:Silicon Dioxide; D009532:Nickel; D007501:Iron; D009584:Nitrogen; C005805:quintozene