gnsmno2吸附剂去除废水中重金属离子的实验分析.docx

GNS/MnO,吸附剂去除废水中重金属离子的实验研究
摘 要
本文结合碳质材料和锰氧化物的优点,以石墨烯作为载体,采用快速的微波辅助合成方法,制各了石墨烯负载二氧化锰的新型复合吸附剂(GNS/Mn02)。采用BET、SEM、 TEM、XRD、FTIR、XPS等现代化测试手段对复合GNS/Mn02吸附剂的性能进行了表征。分别以Mn02和GNS作为对比吸附剂,探讨了废水的pH值、不同重金属离子初始浓度、吸附时间、吸附温度等因素对去除水中Ni2+效果的影响;对影响GNS/Mn02吸附水中Pb2+和Cu2十的单因素进行了实验分析,同时结合现代化测试手段对Pb2十和Cu2十的吸附机理进行了深入分析,提出了pb2+和cu2+离子在GNS/Mn02表面可能的络合形式, 并对该吸附剂的再生性能进行了研究。
实验结果表明,GNS/MnO:吸附剂去除废水中Ni2+、Pb2+和Cu2+。吸附等温线研究结果表明,Ni2+、Pb2+和Cu2+在GNS/MnO:表面的吸附均符合Langmuir模型,在室温条件下GNS/Mn02对Ni2+, 。GNS作为载体,增大了吸附剂的比表面积,Mn02起主要的吸附作用。同时GNS/Mn02吸附剂对废水中pb2十和Cu2+有很好的去除效果,,表明GNS/Mn02吸附 Pb2+的能力大于吸附Cu2+。动力学模型分析结果表明GNS/MnO。对Ni2+、pb2+和Cu2+达到平衡吸附的时间均为2h,吸附过程符合准二级动力学方程。借助于SEM、XRD、XPS、 FTIR等分析手段,全面探讨了GNS/Mn02表面吸附pb2+和Cu2+前后的变化。结果表明
铅和铜呸坠三二墓竺￡:垄茎哩堕王型苎型翌Q2壶面,与GNs瓜恤02表面的羟基基团发生
了络合反应。GNS/MnO。吸附剂经过5次循环使用后吸附能力只损失了9%,有很好的再生性能。实验证明本研究制备的GNS/Mn02可以作为处理水中重金属离子的高效吸附剂,有广泛的应用前景。
关键词:石墨烯/二氧化锰;吸附:重金属离子
哈尔溟工稃大学硕十学何论文
AB STRACT
Considering the advantage of Mn02 and GNS,this paper choose GNS as a carrier, GNS/posite WaS synthesized via microwave-aSsisted surface properties of the adsorbent was explored by BET,SEM,TEM,XRD,FTIR and experiments were conducted to investigate the adsorption effect of Niz+under different solution pH,initial concentration and contact time onto GNS/poske parison with pure Mn02 and batch experiments were conducted tO investigate the
adsorption effect of Pb2+and cu2+.The surface interactions involved in the adsorption process
were explored by modem testing conceptual model for the adsorption WaS
proposed to illustrate the mechanisms.
The results show binding of Ni2+,pb2+and Cu2+onto GNS/Mn02 is highly pH—dependent with the optimum performance at about pH — isotherm call be described by the Langmuir model for the Ni2+,pb2+,Cu2+.The saturate adsorption capacity of Ni2+onto GNSBvln02 is mg/g at room temperature,which is and 1 5 times higher than tho