Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi, 211005, India.
Environ Sci Pollut Res Int. 2021 Jul;28(27):36680-36694. doi: 10.1007/s11356-021-13256-3. Epub 2021 Mar 11.
Water pollution has become a worldwide threat as the natural water resources are shrinking day by day. Emergent actions are needed to conserve water stocks to fulfill the sustainable development goals. Herein, we have prepared activated carbon-doped magnetic nanocomposites (AC@CoFeO) with environment friendly approach and characterized for FTIR, XRD, SEM, EDS, BET surface area, and pH. AC@CoFeO nanocomposite was applied for the decolorization of toxic food dyes (rhodamine B and tartrazine) from wastewater. Effect of ultrasonic waves, pH, contact time, surfactants, temperature, and analysis of real wastewater systems were studied. Adsorption isotherm, kinetics, and thermodynamics of the experiment were calculated for the present removal process. The effect of ultrasonication shows that the maximum removal percentage for RhB was found to be 92% and for tartrazine, it was found to be 86% at 60 min. Ultrasound-assisted adsorption and degradation revealed good results because of the formation of highly active H and OH radicals in the liquid through the decomposition of water molecules by the formation of hot spots under ultrasonic waves. Highest decolorization of 69% was obtained for RhB with anionic surfactant SDS and climax decolorization of tartrazine was acquired in case of CTAB as 60.5%. Analysis of real wastewater samples shows that the decolorization of RhB was found to be ~ 91% from well-water and ~ 95% removal of tartrazine was observed from submersible water on AC@CoFeO nanocomposites. The decolorization best fitted (R < 0.988) with Langmuir model and value of Langmuir climax decolorization efficiency (Q) was found to be 142.68 and 435.72 mg/g for RhB and tartrazine, respectively. Kinetic analysis revealed that adsorption follows pseudo-second-order equation. The dye-loaded AC@CoFeO nanocomposites were recycled by 0.1 M HCl or NaOH and regenerated AC@CoFeO nanocomposites were used up to five rounds with better adsorption efficiency.
水污染已成为全球范围内的威胁，因为自然资源正日益减少。需要采取紧急行动来保护水资源，以实现可持续发展目标。在这里，我们采用环保方法制备了活性炭掺杂磁性纳米复合材料（AC@CoFeO），并对其进行了傅里叶变换红外光谱（FTIR）、X 射线衍射（XRD）、扫描电子显微镜（SEM）、能谱分析（EDS）、比表面积（BET）和 pH 值的表征。AC@CoFeO 纳米复合材料用于从废水中去除有毒食品染料（罗丹明 B 和柠檬黄）。研究了超声、pH 值、接触时间、表面活性剂、温度以及实际废水系统的分析。为了进行当前的去除过程，计算了吸附等温线、动力学和热力学实验。超声的影响表明，在 60 分钟时，罗丹明 B 的最大去除率为 92%，柠檬黄的最大去除率为 86%。超声辅助吸附和降解由于在超声下通过形成热点分解水分子而在液体中形成高活性 H 和 OH 自由基，因此效果良好。使用阴离子表面活性剂 SDS 对 RhB 进行了最高 69%的脱色，使用 CTAB 对柠檬黄进行了最高 60.5%的脱色。对实际废水样品的分析表明，在 AC@CoFeO 纳米复合材料上，井水的 RhB 脱色率约为 91%，潜水用水的柠檬黄去除率约为 95%。脱色效果最好地符合朗缪尔模型（R < 0.988），朗缪尔峰值脱色效率（Q）的值分别为 RhB 和柠檬黄的 142.68 和 435.72 mg/g。动力学分析表明，吸附遵循准二级方程。用 0.1 M HCl 或 NaOH 回收负载染料的 AC@CoFeO 纳米复合材料，并将再生的 AC@CoFeO 纳米复合材料循环使用五轮，具有更好的吸附效率。
