Adsorption and removal of acid red 3R from aqueous solution using flocculent humic acid isolated from lignite
Humic acid (HA) was isolated from lignite.Flocculent HA was made and used to adsorb and remove dye acid red 3R from aqueous solution.The adsorption experiments were carried out in a batch process to observe the effect of various parameters such as contact time,dose of flocculent HA,ionic strength (NaCl) as well as adsorption kinetics and isotherm.Results showed that adsorption of acid red 3R on flocculent HA could reach equilibrium at less than 180 min.The adsorption kinetics obeyed the pseudo-second order model (R2=0.994).The adsorption was described with Freundlich equation on the basis of value of regression coefficient (R2=0.984).The removal rate of the dye increased with the increase of the dose of flocculent HA,while it decreased with the addition of NaCl in the aqueous solution.These suggested that the adsorption mechanism was the electrostatic attraction,to form hydrogen bonds,and van der waals force between molecules of HA and acid red 3R.Conclusion was made that flocculent HA isolated from lignite could be used as an adsorbent to remove the dye from aqueous solution.
Dye Acid red 3R Adsorption Humic acid Lignite
Duanping Xu Changjian Gu Xiao Chen
School of Resource and Environmental Engineering, Liaoning Technical University, Fuxin 123000, China
国际会议
2013 International Symposium on Environmental Science and Technology(2013环境科学与技术国际会议)
大连
英文
101-106
2013-06-04（万方平台首次上网日期，不代表论文的发表时间）