School of Chemistry & Environment, South China Normal University, Guangzhou 510006, China.
School of Chemistry & Environment, South China Normal University, Guangzhou 510006, China.
J Hazard Mater. 2015 Apr 9;286:517-24. doi: 10.1016/j.jhazmat.2015.01.014. Epub 2015 Jan 6.
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.
采用 NaOH、CaO 和 H2O 对煤飞灰（CFA）进行活化，制备用于去除铅酸电池厂硫酸雾的吸附剂。考察了吸附剂制备过程中温度、时间、CFA/活化剂和水/固比等参数的影响。结果表明，与原始煤飞灰和 CaO 相比，合成的吸附剂对硫酸雾的去除能力要高得多，除了 H2O 活化的吸附剂，由于其去除能力低，因此将其排除在研究之外。硫酸雾去除效率随制备时间的延长和温度的升高而增加。此外，CFA/活化剂和水/固比也会影响去除效率，确定的最佳制备条件为：水/固比为 10:1，温度为 120°C，时间为 10h；CFA:CaO 重量比为 10:1，NaOH 溶液浓度为 3mol/L。NaOH/CaO 活化后表面形成粗糙结构和增加表面积有利于硫酸雾的吸附，可能的吸附机制可能是吸附剂表面与硫酸雾之间的静电吸引和化学沉淀。
