文献类型：期刊文献

英文题名：Kinetic and equilibrium study of the removal of reactive dye using modified walnut shell

作者：Li, Shenmaishang[1];Zeng, Zuoxiang[1];Xue, Weilan[1]

机构：[1]East China Univ Sci & Technol, Inst Chem Engn, Shanghai 200237, Peoples R China

年份：2019

卷号：80

期号：5

起止页码：874

外文期刊名：WATER SCIENCE AND TECHNOLOGY

收录：;EI(收录号：20195107879336);WOS:【SCI-EXPANDED(收录号:WOS:000498607200007)】；

语种：英文

外文关键词：kinetics; reactive dye; regeneration; thermodynamics; walnut shell

摘要：Modified walnut shell (EAWNS) was prepared by reaction with epichlorohydrin and alkaline solution of aspartic acid and used to remove reactive dye (Reactive Brilliant Blue (KN-R)) from aqueous media. The isotherms, kinetics and thermodynamics of KN-R adsorption onto EAWNS were studied at 298-318 K. The isotherm data of KN-R adsorption onto EAWNS agreed closely with the Langmuir model. The theoretical monolayer adsorption capacity for KN-R was 224.42 mg/g at 318 K. The result from the Dubinin-Radushkevich model showed that the KN-R adsorption onto EAWNS is chemisorption. The adsorption rate of KN-R onto EAWNS conformed to the pseudo-second-order model. The diffusion mechanism was investigated by the intraparticle diffusion model. The mass-transfer coefficient calculated by the surface mass-transfer coefficient model was in range of 2.95 x 10(-5) to 2.93 x 10(-4)cm/s. The thermodynamic results suggested that the adsorption of KN-R onto EAWNS is spontaneous and endothermic in nature. The design of a single-stage batch adsorption process based on EAWNS adsorbent was carried out. Furthermore, the recycled EAWNS maintains high adsorption capacity despite four cycles.