Integrated Bioprocessing Laboratory, School of Bioengineering, SRM Institute of Science and Technology (SRM IST), Kattankulathur, Tamil Nadu, 603 203, India.
Department of Chemical Engineering, Sri Sivasubramaniya Nadar College of Engineering, Chennai, 603 110, India.
Chemosphere. 2021 Jun;272:129896. doi: 10.1016/j.chemosphere.2021.129896. Epub 2021 Feb 8.
Owing to the global industrialization, a new generation of pharmaceutical pollutants with high toxicity and persistency have been detected. In the present study, silica microspheres, a promising adsorbent has been employed to investigate the extent of removal of prevalent therapeutic acetaminophen, an emerging micropollutant, from wastewater in isolated batch experiments. The BET surface area of the adsorbent was 105.46 m/g with a pore size of 15 nm. Characterization of adsorbent by scanning electron microscopy analysis revealed the microparticulate nature with a 15 ± 5 μm particle size. Optimization of reaction parameters for enhanced assimilative removal of pollutants was performed and the highest adsorption of 96.7% of acetaminophen with an adsorption capacity of 89.0 mg/g was observed upon contact time of only 30 min. Mild process conditions of pH 5.0, 20 ppm of acetaminophen, temperature of 303 K, and 100 ppm sorbent concentration further aided in the removal process. Obtained data were best corresponded with the Freundlich isotherm (n = 2.685), indicating highly favorable adsorption. Acetaminophen adsorption kinetics obeyed the pseudo second order and feasible energetic changes were yielded through the thermodynamic analysis. Silica microspheres recovery carried out through a single-step desorption process had a 99.14% retrieval ability.
由于全球工业化的发展，新一代具有高毒性和持久性的药物污染物已经被检测到。在本研究中，采用具有广阔应用前景的硅胶微球作为吸附剂，在独立的批量实验中研究了普遍存在的治疗药物对乙酰氨基酚（一种新兴的微污染物）从废水中去除的程度。吸附剂的 BET 比表面积为 105.46 m/g，孔径为 15nm。通过扫描电子显微镜分析对吸附剂进行的表征显示出具有 15±5μm 粒径的微颗粒性质。优化了反应参数，以增强污染物的同化去除，观察到在接触时间仅为 30 分钟时，对乙酰氨基酚的吸附率最高可达 96.7%，吸附容量为 89.0mg/g。温和的过程条件，包括 pH 值 5.0、20ppm 的对乙酰氨基酚、303K 的温度和 100ppm 的吸附剂浓度，进一步有助于去除过程。获得的数据与 Freundlich 等温线（n=2.685）最佳对应，表明吸附非常有利。对乙酰氨基酚的吸附动力学符合拟二级动力学模型，通过热力学分析得出了可行的能量变化。通过单步解吸过程进行的硅胶微球回收具有 99.14%的回收能力。
