Madhusudhan Arshitha, Zelenka Tomas, Satrapinskyy Leonid, Roch Tomas, Gregor Maros, Cheng Peng, Monfort Olivier
Department of Inorganic Chemistry, Faculty of Natural Sciences, Comenius University Bratislava, Ilkovicova 6, Mlynska Dolina, 842 15, Bratislava, Slovak Republic.
Department of Chemistry, Faculty of Sciences, University of Ostrava, 30. dubna 22, 701 03, Ostrava, Czech Republic.
Environ Sci Pollut Res Int. 2025 Jun;32(30):18107-18120. doi: 10.1007/s11356-025-36706-8. Epub 2025 Jul 11.
Contaminants of emerging concerns, such as sulfonamides, have been frequently discovered in surface water, and the design of biomass-based adsorbents is a promising research direction to remove them from water. In this study, hydrothermal carbonization was utilized to prepare hydrochar (HC) from orange peels along with various activations, including hydrogen peroxide (HO) and HCl. The main goals of the present study are (i) to prepare hydrochars that were activated by different chemical methods and (ii) to provide insights into the adsorption mechanism of pollutant removal using sulfamethoxazole (SMX) as a model pharmaceutical pollutant. The HO activated hydrochar (ACHC) exhibited the best adsorption capacity for removal of 40 μM SMX from water, i.e., 1.971 mg g using 0.2 g L ACHC. Scanning electron microscopy (SEM) studies revealed that the ACHC exhibited a coral-like structure and the highest amount of mesopores (74.6 m g) and BET area of 79.5 m g. The effects of pH, adsorbent dosage, initial concentration, and adsorption temperature were investigated, and a substantial relationship between porosity and adsorption suggests that mesoporosity played a crucial role in the adsorption process for all the activated hydrochars. The mechanism of SMX adsorption involves reversible chemisorption and retention in the pores of the adsorbent surface. The use of ACHC was also tested in different water matrices to highlight its potential applications in wastewater treatment, and it exhibited an adsorption capacity of 0.598 and 0.429 mg g in tap water and wastewater effluents, respectively.
新兴关注的污染物，如磺胺类药物，经常在地表水中被发现，而基于生物质的吸附剂设计是将它们从水中去除的一个有前景的研究方向。在本研究中，利用水热碳化法从橙皮制备水热炭（HC），并进行了包括过氧化氢（HO）和盐酸（HCl）在内的各种活化处理。本研究的主要目标是：（i）制备通过不同化学方法活化的水热炭；（ii）以磺胺甲恶唑（SMX）作为模型药物污染物，深入了解污染物去除的吸附机制。HO活化的水热炭（ACHC）对从水中去除40 μM SMX表现出最佳吸附容量，即使用0.2 g/L的ACHC时为1.971 mg/g。扫描电子显微镜（SEM）研究表明，ACHC呈现出珊瑚状结构，中孔数量最多（74.6 m²/g），BET比表面积为79.5 m²/g。研究了pH值、吸附剂用量、初始浓度和吸附温度的影响，孔隙率与吸附之间的显著关系表明，中孔率在所有活化水热炭的吸附过程中起关键作用。SMX的吸附机制涉及可逆化学吸附和在吸附剂表面孔隙中的保留。还在不同的水基质中测试了ACHC的使用，以突出其在废水处理中的潜在应用，它在自来水和废水流出物中的吸附容量分别为0.598和0.429 mg/g。
