title: Treatment of nanowaste via fast crystal growth: with recycling of nano-SnO2 from electroplating sludge as a study case.
abstract: The treatment of industrial sludge containing amorphous/nanophase metal oxides or hydroxides is one of the vital issues in hazardous waste disposal. In this work, we developed a strategy to recycle nano-SnO(2) from tinplate electroplating sludge. It revealed that the major components of this sludge were acid soluble Sn and Fe amorphous phases. By introducing NaOH as a mineralizer, a fast growth of amorphous Sn compound into acid-insoluble SnO(2) nanowires was achieved selectively. Thus, the as-formed nano-SnO(2) could be recycled via dissolving other solid compositions in the sludge by using acid. The role of NaOH on accelerating both the Oriented Attachment (OA) and Ostwald Ripening (OR) growth of SnO(2) was discussed, which was regarded as a critical factor for treating the sludge. A pilot-scale experiment was conducted to treat 2.3 kg original sludge and the recycling of about 90 g nano-SnO(2) was achieved. We anticipate this work can provide a good example for the recycling of valuable metals from industrial sludge containing fine metal oxides or hydroxides.
authors.affiliation: State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China.
authors.forename: Zanyong
authors.initials: Z
authors.lastname: Zhuang
authors.forename: Xinjiang
authors.initials: X
authors.lastname: Xu
authors.forename: Yongjing
authors.initials: Y
authors.lastname: Wang
authors.forename: Yandi
authors.initials: Y
authors.lastname: Wang
authors.forename: Feng
authors.initials: F
authors.lastname: Huang
authors.forename: Zhang
authors.initials: Z
authors.lastname: Lin
mesh_terms: D003460:Crystallization; D004595:Electroplating; D007220:Industrial Waste; D053758:Nanoparticles / Q000737:chemistry*; D017942:Nitric Acid / Q000737:chemistry; D059027:Recycling / Q000379:methods*; D012972:Sodium Hydroxide / Q000737:chemistry; D017971:Tin Compounds / Q000737:chemistry*; D018505:Waste Management / Q000379:methods*; D014961:X-Ray Diffraction
chemical_list: D007220:Industrial Waste; D017971:Tin Compounds; D017942:Nitric Acid; D012972:Sodium Hydroxide; C045358:stannic oxide