摘要
利用桉叶磁性生物质吸附剂(ELMB)处理含铅废水,结果表明,影响吸附效果的主要因素为初始pH、接触时间和ELMB投加量。当Pb^(2+)初始摩尔浓度为0.5mmol/L、初始pH为5、接触时间为1h、ELMB投加量为2.0g/L时,Pb^(2+)去除率高于95%。Langmuir和Freundlich吸附等温模型都能较好拟合ELMB对Pb^(2+)的吸附。吸附前后红外图谱表明,Fe—O、C≡N、C=O、C=C和O—H可能参与了吸附反应。外加磁场后,15min即可完成铅冶炼废水中的ELMB分离。预处理后,ELMB吸附—磁分离联合工艺处理铅冶炼废水,出水可达到《铅、锌工业污染物排放标准》(GB 25466—2010)。
In this study,the removal of Pb^（2＋）from lead-contained wastewater by eucalyptus leaf-based magnetic biomass（ELMB）was investigated.The results showed that the adsorption was significantly influenced by initial pH,contact time and adsorbent dosage.The Pb^（2＋）removal up to 95% was obtained under the initial Pb^（2＋）molar concentration of 0.5 mmol/L,contact time of 1 h,ELMB dosage of 2.0 g/L and initial pH of 5.Langmuir and Freundlich isotherm models fitted to the adsorption data of Pb^（2＋）well.The analysis of infrared spectra of the raw and metal-loaded ELMB indicated that different functional groups（Fe—O,C≡N,C=O,C=C and O—H）on ELMB were responsible for the interaction with Pb^（2＋）.Separation between the solid and liquid of lead smelting effluent could be achieved by magnetic separation for 15 min.Additionally,treatment of lead smelting effluent by pretreated-ELMB adsorption-magnetic separation indicated that the contents of Pb^（2＋）and its associated metals were all below discharge limits of＂Emission standard of pollutants for lead and zinc industry＂（GB 25466-2010）.
作者
陈成
唐艳葵
王颖
彭小裕
张伟
莫雅圆
梁艳
CHEN Cheng;TANG Yankui;WANG Ying;PENG Xiaoyu;ZHANG Wei;MO Yayuan;LIANG Yan(School of the Environzn ent,Guangxi University,Nanning Guangxi 53000)
出处
《环境污染与防治》
CAS
CSCD
北大核心
2018年第6期621-626,共6页
Environmental Pollution & Control
基金
国家自然科学基金资助项目(No.51168001
No.51668006)
广西自然科学基金回国基金资助项目(No.2015GXNSFCA139015)
2014年中央重金属污染防治专项(No.20140944)
国家社会科学基金西部项目(No.15XKS018)
关键词
磁性生物质
吸附
磁分离
处理
含铅废水
magnetic biomass
adsorption
magnetic separation
removal
lead contained wastewater
