CSIR-Central Electrochemical Research Institute, Karaikudi 630 006, India.
Environ Sci Pollut Res Int. 2013 Feb;20(2):987-96. doi: 10.1007/s11356-012-0928-7. Epub 2012 May 5.
A batch adsorption process was applied to investigate the removal of manganese from aqueous solution by oxidized multiwalled carbon nanotubes (MWCNTs). In doing so, the thermodynamic, adsorption isotherm, and kinetic studies were also carried out. MWCNT with 5-10-nm outer diameter, surface area of 40-600 m(2)/g, and purity above 95 % was used as an adsorbent. A systematic study of the adsorption process was performed by varying pH, ionic strength, and temperature. Manganese-adsorbed MWCNT was characterized by Raman, FTIR, X-ray diffraction, XPS, SEM, and TEM. The adsorption efficiency could reach 96.82 %, suggesting that MWCNT is an excellent adsorbent for manganese removal from water. The results indicate that second-order kinetics model was well suitable to model the kinetic adsorption of manganese. Equilibrium data were well described by the typical Langmuir adsorption isotherm. Thermodynamic studies revealed that the adsorption reaction was spontaneous and endothermic process. The experimental results showed that MWCNT is an excellent manganese adsorbent. The MWCNTs removed the manganese present in the water and reduced it to a permissible level making it drinkable.
采用批式吸附法研究了氧化多壁碳纳米管（MWCNTs）从水溶液中去除锰的过程。同时还进行了热力学、吸附等温线和动力学研究。所用吸附剂为外径 5-10nm、比表面积 40-600m²/g、纯度高于 95%的 MWCNT。通过改变 pH 值、离子强度和温度，对吸附过程进行了系统研究。用拉曼、FTIR、X 射线衍射、XPS、SEM 和 TEM 对锰吸附 MWCNT 进行了表征。吸附效率可达 96.82%，表明 MWCNT 是一种从水中去除锰的优良吸附剂。结果表明，二阶动力学模型很好地适用于模拟锰的动力学吸附。典型的 Langmuir 吸附等温线很好地描述了平衡数据。热力学研究表明，吸附反应是自发的、吸热的过程。实验结果表明，MWCNT 是一种优良的锰吸附剂。MWCNTs 去除了水中存在的锰，并将其降低到可饮用的水平。
