Adsorption equilibrium and kinetics studies of divalent manganese from phosphoric acid solution by using cationic exchange resin  

作　　者：Haibo Zhuang Yanjun Zhong Lin Yang 

机构地区：[1]School of Chemical Engineering,Sichuan University,Chengdu 610065,China

出　　处：《Chinese Journal of Chemical Engineering》2020年第11期2758-2770,共13页中国化学工程学报（英文版）

摘　　要：There are numerous impurities in wet-process phosphoric acid,among which manganese is one of detrimental metallic impurities,and it causes striking negative effects on the industrial phosphoric acid production and downstream commodity.This article investigated the adsorption behavior of manganese from phosphoric acid employing Sinco-430 cationic ion-exchange resin.Resorting FT-IR and XPS characterizations,the adsorption mechanism was proved to be that manganese was combined with sulfonic acid group.Several crucial parameters such as temperature,phosphoric acid content and resin dose were studied to optimize adsorption efficiency.Through optimization,removal percentage and sorption capacity of manganese reached 53.12 wt%,28.34 mg·g^-1,respectively.Pseudo-2nd-order kinetic model simulated kinetics data best and the activation energy was evaluated as 6.34 kJ·mol^-1 for the sorption reaction of manganese.In addition,the global adsorption rate was first controlled by film diffusion process and second determined by pore diffusion process.It was found that the resin could adsorb up to 50.24 mg·g^-1 for manganese.Equilibrium studies showed that Toth adsorption isotherm model fitted best,followed by Temkin and Langmuir adsorption isotherm models.Thermodynamic analysis showed that manganese adsorption was an endothermic process with enhanced randomness and spontaneity.

关 键 词：MANGANESE Ion exchange Phosphoric acid KINETICS ISOTHERM THERMODYNAMICS 

分 类 号：TQ126.35[化学工程—无机化工] TQ425.23