Department of Chemical Engineering, Sri Sivasubramaniya Nadar College of Engineering, Kalavakkam, Chennai, 603110, India; Centre of Excellence in Water Research (CEWAR), Sri Sivasubramaniya Nadar College of Engineering, Kalavakkam, Chennai, 603110, India.
Department of Chemical Engineering, Sri Sivasubramaniya Nadar College of Engineering, Kalavakkam, Chennai, 603110, India; Centre of Excellence in Water Research (CEWAR), Sri Sivasubramaniya Nadar College of Engineering, Kalavakkam, Chennai, 603110, India.
Environ Pollut. 2022 Aug 15;307:119523. doi: 10.1016/j.envpol.2022.119523. Epub 2022 May 25.
Magnetic carbon were synthesized from sugarcane bagasse using hydrothermal carbonization followed by thermal activation was converted to solid state as beads (hydrogels SACFe) using sodium alginate and applied as adsorbent in removal sulfamethoxazole in batch and column mode. From adsorption parameter analysis it was confirmed that 0.6 g L SACFe was effective in removing 50 mg L of SMX at pH 6.2. Sorption of SMX on SACFe beads followed Elovich kinetics and Freundlich isotherm. It was further confirmed that sorption occurred on heterogeneous surface of SACFe beads with chemisorption as rate limiting step. Maximum adsorption capacity was obtained as 58.439 mg g pH studies revealed that charged assisted hydrogen bonding, EDA interactions are some of the mechanism that favoured removal of SMX. From column studies it was found that bead height of 2 cm and flow rate of 1.5 mL min found to be best in removing pollutant. Thomas model fitted better the experimental data stating that improved interaction between adsorbent and adsorbate act as major driving force tool in obtaining maximum sorption capacity. Breakthrough curve was completely affected by varied flow rate and bed height. Column adsorption was effective in reducing COD and BOD levels of sewage which are affected by toxic pollutants and miscellaneous compounds. Feasibility analysis showed that SACFe beads could be employed for real-time applications as it is cost, energy effective and easy recovery.
采用水热碳化法从甘蔗渣中合成磁性碳，然后通过热激活将其转化为固体珠状（水凝胶 SACFe），使用海藻酸钠作为吸附剂，用于在批处理和柱式模式下去除磺胺甲恶唑。通过吸附参数分析，证实 0.6 g/L 的 SACFe 在 pH 6.2 时可有效去除 50 mg/L 的 SMX。SMX 在 SACFe 珠上的吸附遵循 Elovich 动力学和 Freundlich 等温线。进一步证实，吸附发生在 SACFe 珠的非均相表面上，其中化学吸附是限速步骤。最大吸附容量为 58.439 mg/g。pH 值研究表明，电荷辅助氢键、EDA 相互作用是促进 SMX 去除的一些机制。从柱研究中发现，2 cm 高的珠体和 1.5 mL/min 的流速最适合去除污染物。Thomas 模型更能拟合实验数据，表明吸附剂和吸附质之间的相互作用得到改善，是获得最大吸附容量的主要驱动力。穿透曲线完全受到不同流速和床高的影响。柱吸附能有效降低污水中的 COD 和 BOD 水平，这些水平受有毒污染物和杂化合物的影响。可行性分析表明，SACFe 珠可用于实时应用，因为它具有成本效益、节能且易于回收。
