Aerosol and Nanoparticle Technology Laboratory, Environmental Science and Engineering Department, Indian Institute of Technology Bombay, Mumbai, 400076, India.
Inter-Disciplinary Program in Climate Studies, Indian Institute of Technology Bombay, Mumbai, 400076, India.
Environ Sci Pollut Res Int. 2023 Aug;30(37):87599-87612. doi: 10.1007/s11356-023-28598-3. Epub 2023 Jul 10.
Rise in polymer industry and extensive use of their products leads to leaching of phthalate esters and distributed into the different matrices of the environment. This chemical group has the potential to hamper the life of living organisms and ecosystem. Thus, it is essential to develop cost-effective adsorbents capable of removing these harmful compounds from the environment. In this work, peanut hull-derived biochar was taken as the adsorbent, and DMP was selected as the model pollutant or adsorbates. The biochars of different properties were produced at three pyrolysis temperatures (i.e., 450, 550, and 650 °C) to check how temperature affected the adsorbent properties and adsorption performance. Consequently, the performance of biochars for DMP adsorption was thoroughly studied by the combination of experiments and compared with commercial activated carbon (CAC). All the adsorbents are meticulously characterized using various analytical techniques and used for adsorption DMP from aqueous solutions. The results suggested that adsorption was favoring chemisorption with multi-layered adsorption as adsorption kinetics and isotherm are in good alignment with pseudo-second-order kinetics and Freundlich isotherm, respectively. Further, thermodynamic study revealed DMP adsorption on adsorbent is physically spontaneous and endothermic. The removal efficiency order of four adsorbent was as follows: BC650 > CAC > BC550 > BC450 with maximum efficiency of 98.8% for BC650 followed by 98.6% for CAC at optimum conditions. And as it is a short carbon chain PAE, dominant mechanisms of adsorption for DMP onto porous biochar were H-bonding, π-π EDA interactions, and diffusion within the pore spaces. Therefore, this study can provide strategies for the synthesis of biochar for effectively removing DMP from aqueous solution.
聚合物工业的兴起和广泛应用导致邻苯二甲酸酯类物质的浸出，并分布在环境的不同基质中。该化学物质有可能破坏生物的生命和生态系统。因此，开发具有成本效益的吸附剂来从环境中去除这些有害化合物是至关重要的。在这项工作中，以花生壳衍生的生物炭作为吸附剂，并选择 DMP 作为模型污染物或吸附物。在三种不同的热解温度（450、550 和 650°C）下制备了不同性质的生物炭，以检查温度如何影响吸附剂的性质和吸附性能。因此，通过实验结合并与商业活性炭（CAC）进行比较，对生物炭对 DMP 吸附的性能进行了深入研究。所有吸附剂均使用各种分析技术进行了精心表征，并用于从水溶液中吸附 DMP。结果表明，吸附有利于化学吸附和多层吸附，吸附动力学和吸附等温线分别与准二级动力学和 Freundlich 等温线吻合较好。此外，热力学研究表明 DMP 在吸附剂上的吸附是物理自发的和吸热的。四种吸附剂的去除效率顺序为：BC650 > CAC > BC550 > BC450，BC650 的最大去除效率为 98.8%，CAC 的最大去除效率为 98.6%，在最佳条件下。由于 DMP 是短链 PAE，因此 DMP 吸附到多孔生物炭上的主要吸附机制是氢键、π-π EDA 相互作用和孔内扩散。因此，这项研究可为有效去除水溶液中 DMP 的生物炭的合成提供策略。
