载铁高效除砷生物质炭的制备及其吸附性能研究
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摘要
遴选多种生物质作为原材料,经过水洗、干燥、热解得到相应载铁生物质炭材料,并使用其吸附环境中砷污染物。吸附对比实验结果表明,茶叶渣载铁生物质炭的As吸附效果有明显优势。分别考察了氯化铁用量、质量浓度、老化温度、老化时间和热解温度等对茶叶渣载铁生物质炭As吸附性能的影响,结果表明,载铁生物质炭的最佳制备条件为:氯化铁用量5.33 g/g茶叶渣、质量浓度50%,老化温度70℃、老化时间5 h,热解温度600℃,此条件下制得的茶叶渣载铁生物质炭对砷最优吸附量可达10.70 mg/g。吸附动力学研究表明,符合准二级吸附动力学模型,以表面化学反应控制为主。
A variety of biomass,as raw materials,were subjected to washing,drying and pyrolysis,leading to the corresponding iron-loaded biochar products,which were used for adsorption of arsenic pollutant in the environment. After a test on the comparison of their adsorption properties,it is found that iron-loaded biochar prepared with tea leaves residue shows superiority in arsenic adsorption. Then,effects of dosage of ferric chloride,mass concentration,aging temperature and pyrolysis time on arsenic adsorption properties of iron-loaded biochar prepared with tea leaves residue were investigated. It is shown that under the following optimum preparation conditions,including dosage of ferric chloride at an amount of 5.33 g/g of tea leaves residue,mass concentration at 50%,aging at a temperature of 70 ℃ for 5 h and pyrolysis at a temperature of 600 ℃,the prepared iron-loaded biochar has an arsenic adsorption up to 10.70 mg/g. The following kinetics study showed that adsorption kinetic data fitted well with pseudo-second-order kinetics model and the process was controlled by surface chemical reaction.
A variety of biomass,as raw materials,were subjected to washing,drying and pyrolysis,leading to the corresponding iron-loaded biochar products,which were used for adsorption of arsenic pollutant in the environment. After a test on the comparison of their adsorption properties,it is found that iron-loaded biochar prepared with tea leaves residue shows superiority in arsenic adsorption. Then,effects of dosage of ferric chloride,mass concentration,aging temperature and pyrolysis time on arsenic adsorption properties of iron-loaded biochar prepared with tea leaves residue were investigated. It is shown that under the following optimum preparation conditions,including dosage of ferric chloride at an amount of 5.33 g/g of tea leaves residue,mass concentration at 50%,aging at a temperature of 70 ℃ for 5 h and pyrolysis at a temperature of 600 ℃,the prepared iron-loaded biochar has an arsenic adsorption up to 10.70 mg/g. The following kinetics study showed that adsorption kinetic data fitted well with pseudo-second-order kinetics model and the process was controlled by surface chemical reaction.
引文
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[3] Duku M H,Gu S,Hagan E B. Biochar production potential in Ghana—A review[J]. Renewable&Sustainable Energy Reviews,2011,15(8):3539-3551.
[4] Liang B,Lehmann J,Solomon D,et al. Black carbon increases cation exchange capacity in soil[J]. Soil Science Society of America Journal,2006,70(5):1719-1730.
[5] Fabbri D,Torri C,Spokas K A. Analytical pyrolysis of synthetic chars derived from biomass with potential agronomic application(biochar).Relationships with impacts on microbial carbon dioxide production[J].Journal of Analytical&Applied Pyrolysis,2012,93(1):77-84.
[6] Wang S. Iron(Fe)and manganese(Mn)oxide mineral modified biochars:Characterization and removal of arsenate and lead[D]. Gainsville:University of Florida,2004.
[7]张巧丽.氧化铁/活性炭复合材料的制备及去除水中有机物和As的研究[D].天津:天津大学化工学院,2004.
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