两种燃煤飞灰对废水中Cr(Ⅲ)的吸附性能研究  

Research on removal properties of Cr(Ⅲ) in wastewater with two coal fly ashes as adsorbents

作　　者：黄建伟 魏树辉 张志远 韩世盛 曹宇杰 HUANG Jian-wei;WEI Shu-hui;ZHANG Zhi-yuan;HAN Shi-sheng;CAO Yu-jie(Shanghai Marine Diesel Engine Research Institute,Shanghai 200090,China)

机构地区：[1]中国船舶重工集团公司第七一一研究所,上海200090

出　　处：《应用化工》2020年第S02期204-209,共6页Applied Chemical Industry

摘　　要：火力发电产生的燃煤飞灰,比表面积大、粒径小,是一种重金属吸附剂。本文研究了两种燃煤飞灰对Cr(Ⅲ)的吸附能力,分析了pH、剂量、初始浓度、接触时间等对吸附的影响。动力学研究表明,拟二级动力学方程比拟一级动力学方程适合描述吸附过程,FA_(JJ)与FA_(EZ)对Cr(Ⅲ)的平衡吸附量分别为89.9,16.5 mg/g。XRD、FTIR、SEM-EDS分析结果表明,飞灰中CaO含量、羟基(-OH)数量对Cr(Ⅲ)吸附起关键作用,且吸附主要机理为化学吸附与离子交换。研究认为燃煤飞灰是一种低成本、高效的Cr(Ⅲ)吸附剂。Coal fly ashes(CFAs),produced from process of thermal power generation, is one kind of adsorbents for heavy metal, with advantages of high specific surface area and small particle size.This study is conducted to evaluate the adsorption capacities of two raw CFAs as adsorbents for trivalent chromium removal.Effects of pH,dosage of adsorbent, initial Cr(Ⅲ) concentration and contact time on adsorption are explored, also.Kinetic study is conducted and it is showed that adsorption results fit better to the pseudo-second order kinetic model than pseudo-first order kinetic model.The maximum adsorption capacities are 89.9 and 16.5 mg/g for CFAs FA_(JJ) and FA_(EZ),respectively.According to results of XRD,FTIR and SEM/EDS,CaO content and hydroxyl(-OH) amount play a key role in adsorption process.Moreover, chemisorption and ion exchange are considered to be the main adsorption mechanisms of the adsorption process.This study demonstrates that raw CFAs could be a low-cost and efficient adsorbent for Cr(Ⅲ) removal.

关 键 词：吸附 Cr(Ⅲ)去除 燃煤飞灰 动力学 低成本吸附剂 

分 类 号：TQ424.2[化学工程] O647.3[理学—物理化学] X703[理学—化学]