Hajipour Nahid, Ghorbanpour Mohammad, Safajou-Jahankhanemlou Majid
Department of Chemical Engineering, University of Mohaghegh Ardabili, P. O. Box, 56199-11367, Ardabil, Iran.
Environ Sci Pollut Res Int. 2022 Jul;29(33):49898-49907. doi: 10.1007/s11356-022-19326-4. Epub 2022 Feb 27.
A new adsorbent was synthesized using ion-exchange between iron salts and bentonite modified with acetyl trimethylammonium bromide (CTAB) in the solid phase. Ion-exchange was performed in the solid state at a temperature of 100 °C for 2 min. Various analyses such as X-ray diffraction (XRD), scanning electron microscopy (SEM), porosity measurement (BET), infrared Fourier transform (FT-IR), transmission electron microscopy (TEM), X-ray energy diffraction (EDX), and thermal weighing (TGA) were used to characterize the synthesized nano-adsorbents. Under optimal conditions (pH = 7, time 60 min, concentration of dye solution 150 ppm, and amount of nano-adsorbent 0.75 g/l), the modified nano-adsorbent absorbed 73% of the methyl orange (MO) dye. Adsorption isotherm studies and kinetic model showed that the pseudo-second-order model and Langmuir equation agree with the obtained results. After three reductions of the modified nano-adsorbent in the photo-Fenton process, the dye absorption percentage was 69.50%.
采用铁盐与经溴化乙酰三甲基铵（CTAB）改性的膨润土在固相中进行离子交换的方法合成了一种新型吸附剂。离子交换在100℃的固态温度下进行2分钟。采用X射线衍射（XRD）、扫描电子显微镜（SEM）、孔隙率测量（BET）、红外傅里叶变换（FT-IR）、透射电子显微镜（TEM）、X射线能量衍射（EDX）和热重分析（TGA）等多种分析方法对合成的纳米吸附剂进行表征。在最佳条件（pH = 7、时间60分钟、染料溶液浓度150 ppm、纳米吸附剂用量0.75 g/l）下，改性纳米吸附剂对甲基橙（MO）染料的吸附率为73%。吸附等温线研究和动力学模型表明，准二级模型和朗缪尔方程与所得结果相符。在光芬顿过程中对改性纳米吸附剂进行三次还原后，染料吸附率为69.50%。
