Kyzas George Z, Peleka Efrosyni N, Deliyanni Eleni A
Department of Petroleum and Natural Gas Technology, Technological Educational Institute of Kavala, Kavala 65404, Greece.
Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece.
Materials (Basel). 2013 Jan 10;6(1):184-197. doi: 10.3390/ma6010184.
The present study presents the effective use of nanocrystalline akaganeite for the adsorption of an anionic (SDS), a cationic (CTAB), and a nonionic (tween80) surfactant from wastewater. Equilibrium experiments, as well as thermodynamic analysis, were performed. The maximum SDS adsorption occurs at the lowest pH value (5), the opposite is observed for CTAB (pH = 11), while for tween80, the change of pH value did not affect the adsorption. The equilibrium data could be described by Freundlich and Langmuir isotherms. The maximum adsorption capacity at 25 °C (pH = 8) was 823.96 mg/g for SDS, 1007.93 mg/g for CTAB, and 699.03 mg/g for tween80. The thermodynamic parameters revealed the exothermic and spontaneity nature of the process. Also, FTIR measurements established that surfactants are adsorbed on the surface of akaganeite, replacing adsorbed water.
本研究展示了纳米晶β-氢氧化铁对废水中阴离子表面活性剂（十二烷基硫酸钠，SDS）、阳离子表面活性剂（十六烷基三甲基溴化铵，CTAB）和非离子表面活性剂（吐温80）的有效吸附。进行了平衡实验以及热力学分析。SDS的最大吸附量出现在最低pH值（5）时，CTAB则相反（pH = 11），而吐温80的吸附不受pH值变化的影响。平衡数据可用Freundlich和Langmuir等温线描述。在25°C（pH = 8）时，SDS的最大吸附容量为823.96 mg/g，CTAB为1007.93 mg/g，吐温80为699.03 mg/g。热力学参数表明该过程具有放热和自发的性质。此外，傅里叶变换红外光谱（FTIR）测量表明表面活性剂吸附在β-氢氧化铁表面，取代了吸附的水。
