Department of Environmental Sciences, Tamil Nadu Agricultural University, Coimbatore, 641 003, India.
Agricultural College and Research Institute, Tamil Nadu Agricultural University, Killikulam, 628 252, India.
Sci Rep. 2022 Feb 9;12(1):2184. doi: 10.1038/s41598-022-05943-z.
Recently, hydrothermal carbonization emerges as the most viable option for the management of solid waste with high moisture content. Sludge derived hydrochar is used as an adsorbent for emerging contaminants or micro-pollutants in the domain of sustainability. Current study demonstrates the KOH activation of hydrochar produced from paper board mill sludge and evaluates its removal potential of a Non-steroidal anti-inflammatory drug, Diclofenac from aqueous solution. The activated hydrochars exhibited porous, spherical micro-structures with higher fraction of oxygenated functional groups paving way for the efficient adsorption of Diclofenac. The effect of initial Diclofenac concentration and contact time was ascertained using adsorption kinetics and isotherms. The adsorption kinetics exhibited second-order reaction for all adsorbents indicating higher coefficient of determination (R > 0.9). The Diclofenac adsorption on hydrochars followed Langmuir isotherm model with the post-activated hydrochar recording a highest adsorption capacity of 37.23 mg g in 40 mg L initial Diclofenac concentration at 15 h equilibrium time.
最近，水热碳化作为处理高含水量固体废物的最可行选择而出现。污泥衍生的水碳化产物被用作可持续发展领域中新兴污染物或微量污染物的吸附剂。本研究展示了从纸板厂污泥中生产的水碳化产物的 KOH 活化，并评估了其从水溶液中去除非甾体抗炎药双氯芬酸的潜力。所制备的水热炭化产物具有多孔、球形的微观结构，含有更多的含氧官能团，为双氯芬酸的有效吸附提供了条件。通过吸附动力学和等温线确定了初始双氯芬酸浓度和接触时间的影响。吸附动力学对所有吸附剂均表现为二级反应，表明更高的决定系数（R>0.9）。双氯芬酸在水热炭上的吸附符合朗缪尔等温线模型，后活化水热炭在 40 mg L 的初始双氯芬酸浓度下，在 15 h 的平衡时间内记录到最高吸附容量为 37.23 mg g。
