Study of adsorption of difference particle size of activated carbon with kinetic model

• Main Authors: Tsung-Sheng Chen, 陳宗聖
• Other Authors: Tseng Ru Ling
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/63117363094970425266

碩士 === 國立聯合大學 === 環境與安全衛生工程學系碩士班 === 100 === In the study, the BET Sorptometer is used to measure the pore properties of commercial activated carbons. A scanning electron microscope (SEM) is used to observe the surface topography of activated carbons. By the use of temperature programmed desorption (TPD), the oxide functional group is mostly for CO desorption. Through thermogravimetric analysis (TGA), the most pyrolysis take place when temperature reaches 634 ℃ and the ash content is 8.46 %, through elemental analysis, the element carbon in sample is 90.1 wt %. After the activated carbons are crushed and sieved, four particle diameters are obtained-715, 505, 296 and 163 μm. These particles are used for experiment of adsorption kinetics by the use of six adsorbents-4-Chlorophenol, 4-Cresol, Malachite Green, Methylene Blue, Basic Brown 1 (BB1), and Acid Blue 74 (AB74).Through the analysis of four adsorption kinetics models, 4-Chlorophenol and Basic Brown 1 fit in with pseudo-second-order equation; 4-Cresol, Methylene Blue, Basic Brown 1, and Acid Blue 74, with intraparticle diffusion model; Malachite Green, with Elovich equation; Methylene Blue, with first order rate model.Compared with the adsorptive parameters of the other models in the literature, the activated carbons in the study are proved to have excellent adsorptive capacity and economic advantage. The amount of adsorption in 30 minutes of contact drops significantly with the expansion of particle diameters. Thus, the smaller particle diameters have better adsorption capacities and rate. In addition, the adsorption processes of activated carbons with smaller particle diameters are provided that the adsorptive technology will be widely applied to the wastewater treatment process.