H_(3)PO_(4)活化核桃壳制备活性炭及在Cr(Ⅵ)吸附中的应用  

Preparation of biochar from walnut shells activated by H_(3)PO_(4) and its application in Cr(Ⅵ) adsorption

作　　者：邢献军 罗甜[1] 卜玉蒸 马培勇 XING Xianjun;LUO Tian;BU Yuzheng;MA Peiyong(College of Chemistry and Chemical Engineering,Hefei University of Technology,Hefei 230009,Anhui,China;Advanced Energy Technology and Equipment Research Institute,Hefei University of Technology,Hefei 230009,Anhui,China;National New Energy Vehicle Energy Storage and Supply Product Industry Measurement and Testing Center,Hefei 230051,Anhui,China;College of Mechanical Engineering,Hefei University of Technology,Hefei 230009,Anhui,China)

机构地区：[1]合肥工业大学化学与化工学院,安徽合肥230009 [2]合肥工业大学先进能源技术与装备研究院,安徽合肥230009 [3]国家新能源汽车储供能产品产业计量测试中心,安徽合肥230051 [4]合肥工业大学机械工程学院,安徽合肥230009

出　　处：《化工进展》2023年第3期1527-1539,共13页Chemical Industry and Engineering Progress

基　　金：安徽省科技重大专项(2021e03020003)。

摘　　要：以核桃壳为原料、磷酸(H_(3)PO_(4))为活化剂,制备核桃壳基活性炭(PBC),并对其吸附Cr(Ⅵ)性能进行探究。分别使用SEM、TEM、BET、FTIR、Raman、XPS等表征探究PBC的理化特性。研究溶液pH、活性炭用量和初始浓度对吸附性能的影响,研究PBC在不同吸附时间下吸附Cr(Ⅵ)动力学行为,分析吸附机理。结果表明,在磷酸浸渍比为1∶1,热解温度为400℃时,制备的核桃壳基活性炭具有良好的吸附性能。对较低浓度的Cr(Ⅵ)溶液(≤50mg/L)吸附率达到100%,吸附动力学和等温线分别符合拟二级动力学模型和Langmuir模型,吸附过程中化学吸附占主导地位,并且热力学分析表明吸附过程是自发的吸热过程。Walnut shell-based activated carbon PBC was prepared using walnut shell as raw material and phosphoric acid(H_(3)PO_(4)) as activator,and its adsorption performance on hexavalent chromium was studied.The physical and chemical properties of PBC were measured using SEM,TEM,BET,FTIR,Raman,XPS and other characterizations,respectively.The effects of solution pH,activated carbon dosage and initial concentration on the performance of Cr(Ⅵ) adsorption were investigated.The kinetic behavior of Cr(Ⅵ) adsorption by PBC were examined and the adsorption mechanism was analyzed.The results showed that the prepared walnut shell-based activated carbon had good adsorption performance at a phosphoric acid impregnation ratio of 1∶1 and pyrolysis temperature of 400℃.The adsorption rate reached 100% for the lower concentration of Cr( Ⅵ) solution(≤50mg/L).The adsorption kinetics and isotherms were in accordance with the proposed secondary kinetic model and Langmuir model,respectively,and the chemisorption dominated the adsorption process.The thermodynamic analysis indicated that the adsorption process was a spontaneous heat absorption process.

关 键 词：生物质 活性炭 吸附 

分 类 号：TQ424.1[化学工程]