title: Efficient removal of sulfur hexafluoride (SF6) through reacting with recycled electroplating sludge.
abstract: This paper reports that recycled electroplating sludge is able to efficiently remove greenhouse gas sulfur hexafluoride (SF6). The removal process involves various reactions of SF6 with the recycled sludge. Remarkably, the sludge completely removed SF6 at a capacity of 1.10 mmol/g (SF6/sludge) at 600 °C. More importantly, the evolved gases were SO2, SiF4, and a limited amount of HF, with no toxic SOF4, SO2F2, or SF4 being detected. These generated gases can be readily captured and removed by NaOH solution. The reacted solids were further found to be various metal fluorides, thus revealing that SF6 removal takes place by reacting with various metal oxides and silicate in the sludge. Moreover, the kinetic investigation revealed that the SF6 reaction with the sludge is a first-order chemically controlled process. This research thus demonstrates that the waste electroplating sludge can be potentially used as an effective removal agent for one of the notorious greenhouse gases, SF6.
authors.affiliation: School of Environmental and Chemical Engineering, Shanghai University, Number 333 Nanchen Road, Shanghai 200444, PR China.
authors.forename: Jia
authors.initials: J
authors.lastname: Zhang
authors.forename: Ji Zhi
authors.initials: JZ
authors.lastname: Zhou
authors.forename: Qiang
authors.initials: Q
authors.lastname: Liu
authors.forename: Guangren
authors.initials: G
authors.lastname: Qian
authors.forename: Zhi Ping
authors.initials: ZP
authors.lastname: Xu
mesh_terms: D004595:Electroplating / Q000379:methods*; D012722:Sewage; D017640:Silicates / Q000737:chemistry; D012972:Sodium Hydroxide / Q000737:chemistry; D013459:Sulfur Hexafluoride / Q000737:chemistry*
chemical_list: D012722:Sewage; D017640:Silicates; D012972:Sodium Hydroxide; D013459:Sulfur Hexafluoride