Effect of pyrolytic temperature on the adsorptive removal of p-benzoquinone, tetracycline, and polyvinyl alcohol by the biochars from sugarcane bagasse

Characterization of KOH modified biochars from different pyrolysis temperatures and enhanced adsorption of antibiotics

“…As for the RBC700, q e was kept constant up to pH eqm ¼ 9.76 and less pH inuence was observed around pK a2 , which was indicative of less contribution of electrostatic interactions. This was consistent with the result of the least surface oxygen functional groups (SOFGs) in RBC700 and was in line with Li et al (2016). 8 Considerable decrease of q e happened between pH eqm ¼ 9.16-10.15 because of the deprotonation of dimethylamine (C-4) groups of TC which reduced cation-p bonding between RBC700 and TC molecules.…”

“…9,50,51 The pH value inuence not only electrostatic interaction by altering charges of TC and biochars but also electron acceptor ability and dissociation of amino groups of TC, which nally affected p-p EDA interaction, n-p EDA interaction and cation-p bonding. 5,49 The dependences of the amount of TC sorbed onto biochars on variable initial pH (3)(4)(5)(6)(7)(8)(9) were depicted in Fig. 6.…”

“…One critical point for this method is to nd appropriate adsorbents with high adsorption capacity and low cost such as biochar. However, since TC is an ionic compound and negatively charged in environmental pH conditions, the adsorption capacity of untreated biochars for TC is very low, [8][9][10][11] which makes it necessary to modify the biochars to enhance their adsorption capacity.…”

“…Indeed, it was conrmed that high temperature sugarcane bagasse biochar adsorbed more TC than that from low temperature due to stronger p-p EDA interactions between TC and graphitized surfaces. 8 However, from the view of both modifying and adsorption mechanisms, it seemed that low temperature pyrolysis biochars are also potential for KOH treatment to improve TC adsorption capacity because that alkali treatment could catalyze hydrolysis of lignocellulose le in low temperature biochars and produced more SOFGs. 15,23,24 Furthermore, it may promote TC binding to hydroxyl group or ionized moiety of biochars by n-p EDA interactions ( Fig.…”

Renewable Material-derived Biochars for the Efficient Removal of 2,4-Dichlorophen from Aqueous Solution: Adsorption/Desorption Mechanisms

“…1) Li et al (2016) showed that the abundant functional groups on the surface of biochar were due to the carbonation process. The peaks changed slightly after the 2,4-DCP adsorption onto the BCs, which formed organic C−Cl stretching (704 cm -1 to 762 cm -1 ).…”