改性稻草吸附铜离子过程的内扩散机理
MECHANICS OF INTRAPARTICLE DIFFUSION OF THREE COPPER SPECIATION IN MODIFIED RICE STRAW
-
摘要: 用Boyd模型和W櫣nwald-Wagner模型得到不同温度下三种形态的铜在改性稻草内的表观内扩散系数,而且不同模型得到的数值比较接近.吸咐初期吸附速度相当快,吸附后期吸附动力学部分由内扩散控制.温度愈高到达吸附平衡的时间愈短,内扩散模型的线性时间段愈短.用Mckay模型得到了吸附质粒子在改性稻草吸附壳层内的表观传质系数.Abstract: Wünwald-Wagner and Boyd models were applied to study the mechanics of intraparticle diffusion of three copper speciation in the shell of modified rice straw.The effective intraparticle diffusion coefficients,obtained using the two models respectively,were rather close at same temperature.There were two different diffusion phenomena during adsorption.At beginning(0—5min)the rate of adsorption was rather fast,however,within the later stage the adsorption kinetics was partially controlled by intemal diffusion.The mass transfer effective coefficient was obtained with Mckay method.
-
Key words:
- diffusion /
- modified rice straw /
- copper /
- adsorption /
-
-
[1] 叶林顺,刘慧璇,谢咏梅等,改性稻草吸附铜离子的热力学研究[J].环境污染与防治,2005,27(9):664-666
[2] Cao Youming,Qing Xiaosun,Sun Jun et al.,Graft Copolymerization of Acrylamide onto Carboxymethyl Starch[J].European Polymer Journal,2002,38:1921-1924
[3] Wu Zhijian,Hyeonwoo Joo,Kangtaek Lee,Kinetics and Thermodynamics of the Organic Dye Adsorptionon the Mesoporous Hybrid Xerogel[J].Chemical Engineering Journal,2005,112:227-236
[4] Singh D B,Rupainwar D C,Prasad G et al.,Studies on the Cd (II) Removal from Water by Adsorption[J].Journal of Hazardous Materials,1998,60:29-40
[5] Kalavathy M H,Karthikeyan T,Rajgopal S et al.,Kinetic and Isotherm Studies of Cu(II)Adsorption onto H3PO4-Activated Rubber Wood Sawdust[J].Journal of Colloid and Interface Science,2005,292:354-362
[6] Helfferich F,Ion Exchange[M].McGraw-Hill,New York,1962
[7] 叶林顺,谢咏梅,刘慧璇等,改性稻草吸附铜离子的动力学研究[J].环境科学与技术,2006,29(8):28-30
[8] Singh D B,Rupainwar D C,Prasad G et al.,Studies on the Cd(II)Removal from Water by Adsorption[J].Journal of Hazardous Materials,1998,60:29-40
[9] Mckay G,Otterburn M S,Sweeny A G,Surface Mass Transfer Process during Color Removal from Effluents Using Silica[J].Water Res.,1981,15:327 -
点击查看大图
计量
- 文章访问数: 424
- HTML全文浏览数: 424
- PDF下载数: 451
- 施引文献: 0
下载:
