摘要
为提高核桃壳基生物炭吸附水溶液中Cu^2+的效率,用不同浓度高锰酸钾溶液对高温(600℃)热解制备的核桃壳基生物炭进行改性.通过N2吸附等温线、SEM-EDX和XPS对改性前后核桃壳基生物炭的结构特征和表面化学特性进行分析,结果表明:改性核桃壳基生物炭表面添加了新的含氧基团,含氧基团主要以Mn-O和Mn-OH的形式与锰基团结合.在温度为25℃、pH为5.3的条件下改性核桃壳基生物炭对Cu^2+的最大吸附能力为61.35 mg/g,是未改性核桃壳基生物炭的5.3倍.改性核桃壳基生物炭吸附Cu^2+能力的增加主要是因为表面负载了MnOx和氧基团.
In order to improve the adsorption efficiency of Cu^2+in waste-water,the granular walnut shell derived biochar(BC)through pyrolysis at 600℃was modified using KMnO4 solution of different concentration.The structural characteristics and surface chemical properties of the original and KMnO4 modified BCs were analyzed by N2 adsorption isotherm,SEM-EDX and XPS.The results indicate that new oxygen-containing active sites were added to the surface of KMnO4 modified BCs,and the surface oxygen was bonded to Mn mainly in the forms of Mn-O and Mn-OH.Under the conditions of 25℃and pH 5.3 the maximum Cu^2+adsorption capacity of the KMnO4 modified BC was 61.35 mg/g,which was 5.3 times that of the original BC.The increased adsorption of Cu^2+on the KMnO4 modified BCs was mainly due to the loading of MnOx and O groups on the surface of KMnO4 modified BCs.
作者
商中省
涂佳勇
蔡毅猛
吴龙
李占勇
SHANG Zhongsheng;TU Jiayong;CAI Yimeng;WU Long;LI Zhanyong(Tianjin Key Laboratory of Integrated Design and On-line Monitoring for Light Industry&Food Machinery and Equipment,Tianjin International Joint Research and Development Center of Low-Carbon Green Process Equipment,College of Mechanical Engineering,Tianjin University of Science&Technology,Tianjin 300222,China)
出处
《天津科技大学学报》
CAS
2020年第5期25-31,65,共8页
Journal of Tianjin University of Science & Technology
基金
天津市自然科学基金资助项目(18JCQNJC78000)
天津市教委科研计划项目(2018KJ117)。
