title: Removal of sulfuric acid mist from lead-acid battery plants by coal fly ash-based sorbents.
abstract: Sorbents from coal fly ash (CFA) activated by NaOH, CaO and H2O were prepared for H2SO4 mist removal from lead-acid battery plants. The effects of parameters including temperature, time, the ratios of CFA/activator and water/solid during sorbent preparation were investigated. It is found that the synthesized sorbents exhibit much higher removal capacity for H2SO4 mist when compared with that of raw coal fly ash and CaO except for H2O activated sorbent and this sorbent was hence excluded from the study because of its low capacity. The H2SO4 mist removal efficiency increases with the increasing of preparation time length and temperature. In addition, the ratios of CFA/activator and water/solid also impact the removal efficiency, and the optimum preparation conditions are identified as: a water/solid ratio of 10:1 at 120 °C for 10h, a CFA:CaO weight ratio of 10:1, and a NaOH solution concentration of 3 mol/L. The formation of rough surface structure and an increased surface area after NaOH/CaO activation favor the sorption of H2SO4 mist and possible sorption mechanisms might be electrostatic attractions and chemical precipitation between the surface of sorbents and H2SO4 mist.
authors.affiliation: School of Chemistry & Environment, South China Normal University, Guangzhou 510006, China. Electronic address: hongershu@163.com.
authors.forename: Yuehong
authors.initials: Y
authors.lastname: Shu
authors.affiliation: School of Chemistry & Environment, South China Normal University, Guangzhou 510006, China.
authors.forename: Xiangyu
authors.initials: X
authors.lastname: Wei
authors.affiliation: Sirio Pharma Co., Ltd Shantou 515041, China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Fang
authors.affiliation: School of Chemistry & Environment, South China Normal University, Guangzhou 510006, China.
authors.forename: Bingyan
authors.initials: B
authors.lastname: Lan
authors.affiliation: School of Chemistry & Environment, South China Normal University, Guangzhou 510006, China.
authors.forename: Hongyu
authors.initials: H
authors.lastname: Chen
mesh_terms: D000327:Adsorption; D017610:Calcium Compounds / Q000737:chemistry; D060729:Coal Ash / Q000737:chemistry*; D011211:Electric Power Supplies; D007220:Industrial Waste; D007854:Lead; D010087:Oxides / Q000737:chemistry; D012972:Sodium Hydroxide / Q000737:chemistry; D013464:Sulfuric Acids / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D017610:Calcium Compounds; D060729:Coal Ash; D007220:Industrial Waste; D010087:Oxides; D013464:Sulfuric Acids; D014867:Water; D007854:Lead; D012972:Sodium Hydroxide; C016538:lime; C033158:sulfuric acid
keywords: Activation; Coal fly ash; Fixed bed reactor; Sorption; Sulfuric acid mist