Mohamed Soha Mahrous Ismail, Yılmaz Murat, Güner Eda Keleş, El Nemr Ahmed
Institute of Graduate Studies and Research, Department of Environmental Studies, Alexandria University, Alexandria, Egypt.
Bahçe Vocational School, Department of Chemistry and Chemical Processing Technologies, Osmaniye Korkut Ata University, Osmaniye, 80000, Türkiye.
Sci Rep. 2024 Jan 12;14(1):1241. doi: 10.1038/s41598-024-51587-6.
Iron Oxide-commercial activated carbon nanocomposite (CAC-IO) was prepared from commercial activated carbon (CAC) by the co-precipitation method, and the resulting nanocomposite was used as an adsorbent to remove hexavalent chromium (Cr) ions and Mordant Violet 40 (MV40) dye from wastewater. The produced materials (CAC, CAC after oxidation, and CAC-IO) were comparatively characterized using FTIR, BET, SEM, EDX TEM, VSM, and XRD techniques. The adsorption mechanism of Cr ions and MV40 dye on CAC-IO was examined using Langmuir and Freundlich isotherm models.. Different models were applied to know the adsorption mechanism and it was obtained that Pseudo-second order fits the experimental data better. This means that the adsorption of the adsorbate on the nanocomposite was chemisorption. The maximum removal percent of Cr ions by CAC-IO nanocomposite was 98.6% determined as 2 g L adsorbent concentration, 100 mg L initial pollutant concentration, solution pH = 1.6, the contact time was 3 h and the temperature was room temperature. The maximum removal percentage of Mordant Violet 40 dye (C.I. 14,745) from its solutions by CAC-IO nanocomposite was 99.92% in 100 mg L of initial dye concentrations, 1.0 g L of adsorbent concentration, solution pH = 2.07, the contact time was 3 h. The MV40 dye adsorption on CAC-IO was the most fitted to the Freundlich isotherm model. The maximum adsorption capacity was calculated according to the Langmuir model as 833.3 mg g at 2 g L of adsorbent concentration and 400 mg L of initial MV40 dye concentration. The Cr ions adsorption on CAC-IO was more fitted to the Freundlich model with Q, equal to 312.50 mg g at 1 g L adsorbent concentration and 400 mg L of Cr ions initial concentrations.
采用共沉淀法由商业活性炭（CAC）制备了氧化铁 - 商业活性炭纳米复合材料（CAC - IO），并将所得纳米复合材料用作吸附剂，以去除废水中的六价铬（Cr）离子和媒染剂紫40（MV40）染料。使用傅里叶变换红外光谱（FTIR）、比表面积分析仪（BET）、扫描电子显微镜（SEM）、能谱仪（EDX）、透射电子显微镜（TEM）、振动样品磁强计（VSM）和X射线衍射仪（XRD）技术对所制备的材料（CAC、氧化后的CAC和CAC - IO）进行了对比表征。利用朗缪尔（Langmuir）和弗伦德利希（Freundlich）等温线模型研究了Cr离子和MV40染料在CAC - IO上的吸附机理。应用不同模型来了解吸附机理，结果表明准二级动力学模型能更好地拟合实验数据。这意味着吸附质在纳米复合材料上的吸附为化学吸附。在吸附剂浓度为2 g/L、初始污染物浓度为100 mg/L、溶液pH值为1.6、接触时间为3 h且温度为室温的条件下，CAC - IO纳米复合材料对Cr离子的最大去除率为98.6%。在初始染料浓度为100 mg/L、吸附剂浓度为1.0 g/L、溶液pH值为2.07、接触时间为3 h的条件下，CAC - IO纳米复合材料对其溶液中媒染剂紫40染料（C.I. 14,745）的最大去除率为99.92%。MV40染料在CAC - IO上的吸附最符合弗伦德利希等温线模型。根据朗缪尔模型，在吸附剂浓度为2 g/L和初始MV40染料浓度为400 mg/L时，最大吸附容量计算为833.3 mg/g。在吸附剂浓度为1 g/L和Cr离子初始浓度为400 mg/L时，Cr离子在CAC - IO上的吸附更符合弗伦德利希模型，Q等于312.50 mg/g。
