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  • Title: Mechanistic insights of 2,4-D sorption onto biochar: Influence of feedstock materials and biochar properties.
    Author: Mandal S, Sarkar B, Igalavithana AD, Ok YS, Yang X, Lombi E, Bolan N.
    Journal: Bioresour Technol; 2017 Dec; 246():160-167. PubMed ID: 28756126.
    Abstract:
    Objective of this study was to investigate the mechanisms of 2,4-Dichlorophynoxy acetic acid (2,4-D) sorption on biochar in aqueous solutions. Sorption isotherm, kinetics, and desorption experiments were performed to identify the role of biochars' feedstock and production conditions on 2,4-D sorption. Biochars were prepared from various green wastes (tea, burcucumber, and hardwood) at two pyrolytic temperatures (400 and 700°C). The tea waste biochar produced at 700°C was further activated with steam under a controlled flow. The sorption of 2,4-D was strongly dependent on the biochar properties such as specific surface area, surface functional groups, and microporosity. The steam activated biochar produced from tea waste showed the highest (58.8mgg-1) 2,4-D sorption capacity, which was attributed to the high specific surface area (576m2g-1). The mechanism of 2,4-D removal from aqueous solution by biochar is mainly attributed to the formation of heterogeneous sorption sites due to the steam activation.
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