摘要
Metal ion contamination of drinking water and waste water, especially with heavy metal ion such as lead, is a serious and ongoing problem. In this work, activated carbon prepared from peanut shell （PAC） was used for the removal of Pb^2＋ from aqueous solution. The impacts of the Pb25 adsorption capacities of the acid-modified carbons oxidized with HNO3 were also investigated. The surface functional groups of PAC were confirmed by Fourier transform infrared （FTIR） spectroscopy, X-ray photoelectron spectroscopy （XPS）, Boehm titration. The textural properties （surface area, total pore volume） were evaluated from the nitrogen adsorption isotherm at 77 K. The experimental results presented indicated that the adsorption data fitted better with the Langmuir adsorption model. A comparative study with a commercial granular activated carbon （GAC） showed that PAC was 10.3 times more efficient compared to GAC based on Langmuir maximum adsorption capacity. Further analysis results by the Langmuir equation showed that HNO3 [20% （by mass）] modified PAC has larger adsorption capacity of Pb^2＋ from aqueous solution （as much as 35.5 mg·g^-1）. The adsorption capacity enhancement ascribed to pore widening, increased cation-exchange capacity by oxygen groups, and the promoted hydrophilicity of the carbon surface.
特别与象铅那样的重金属离子，饮用水和废水的金属离子污染是一个严重、进行中的问题。在这个工作，从花生壳(PAC ) 准备的活性炭从水溶液被用于 Pb^(2+) 的移动。修改酸的碳的 Pb2 吸附能力的影响与 HNO3 氧化了也被调查。PAC 的表面官能团被 Fourier 变换证实红外线(FTTR ) 光谱学， X 射线光电子能谱法(XPS ) ， Boehm 滴定。组织上性质(表面积，全部的毛孔体积)在介绍的试验性的结果显示了的 77 K.The 从氮吸附等温线被评估吸附数据与商业颗粒活性炭(粒状活性炭)与兰米尔吸附 model.A 比较级学习更好适合，这证明 PAC 基于兰米尔是与粒状活性炭相比更有效的 10.3 次最大的吸附能力。由兰米尔方程的进一步的分析结果显示出那 HNO3 [20%( 由质量)] 修改 PAC 从水溶液有 Pb^(2+) 的更大的吸附能力(差不多 35.5 mg · g ^(-1)) 。归功于到毛孔拓宽的吸附能力改进，由氧组的增加的阳离子交换能力，和碳的支持的 hydrophilicity 出现。
