硫酸改性污泥活性炭对水中Cr6+的吸附

用硫酸改性污泥活性炭考察硫酸浓度及改性时间对活性炭吸附容量的影响,在最佳改性条件下研究了振荡时间、初始浓度、pH值对活性炭吸附Cr6+的影响.并对改性前后污泥活性炭吸附Cr6+的等温吸附特性、动力学模型进行分析.结果表明:采用体积比为1∶5的硫酸,改性2 h,活性炭对Cr6+吸附容量达9.44 mg/g,较原污泥活性炭提高了53%;改性前后污泥活性炭对Cr6+的吸附均符合Langmuir等温吸附模型和准二级动力学模型.

Adsorption of Cr6+ Onto Activated Carbons From Sewage Sludge by Sulphuric Acid Modification

The activated carbon from sewage sludge was modified with sulphuric acid. The influence of modification time and the concentration of sulphuric acid on adsorption capacity were investigated in the test. In the best condition of modified,the effects of various experimental parameters such as agitation time,initial ion concentration and pH were also studied. The isothermal adsorption characteristics and kinetic dynamics models of original and modified sludge activated carbon adsorbing Cr6 +were used to analyze the dynamic process. Results show that the sludge activated carbon modified 2 hours with 1 ∶ 5concentration of the sulphuric acid has the best adsorption capacity,which reaches 9. 44 mg /g,increased by 53% compared with the original sludge activated carbon. Adsorption data agrees well with the Langmuir and pseudo-second order kinetic model.