Chloramphenicol interaction with functionalized biochar in water: sorptive mechanism, molecular imprinting effect and repeatable application

Abstract

Biochar and functionalized biochar (fBC-1 and fBC-2) were prepared and applied to remove antibiotic chloramphenicol from deionized water, lake water and synthetic wastewater. Results showed that chloramphenicol removal on biochar was pH dependent and maximum sorption occurred at pH4.0-4.5. The sorption data of chloramphenicol fitted better with the Langmuir isotherm model than the Freundlich isotherm model with the maximum Langmuir sorption capacity of 233μMg using fBC-2. Chloramphenicol sorption on fBC-2 followed the trend: deionized water>lake water>synthetic wastewater. The presence of humic acid decreased the sorption distribution coefficient (K) while the presence of low ionic strength and soil in solution increased K value significantly. The mechanism of sorption on fBC mainly involved electron-donor-acceptor (EDA) interactions at pH<2.0; formation of charge assisted hydrogen bond (CAHB) and hydrogen bonds in addition to EDA in the pH4.0-4.5; and CAHB and EDA interactions at pH>7.0. Additionally, solvent and thermal regeneration of fBC-2 for repeatable applications showed excellent sorption of chloramphenicol under the same condition, due to the creation of a molecular imprinting effect in fBC-2. Consequently, fBC-2 can be applied with excellent reusability properties to remove chloramphenicol and other similar organic contaminants.

The Potentiality of Rice Husk-Derived Activated Carbon: From Synthesis to Application

“…Finally, some other weak bonds such as van der Waals forces (e.g., all weak interactions except the hydrogen bonds), surface deposition, and non-defined covalent bonds can also form between the adsorbent and adsorbate molecules. After the use of any sorbent, it is necessary to reuse it again and again for maximum profitability, check the extractability of solute, elucidate the mechanism of adsorption, and check reusability [255]. There are several methods for AC regeneration, namely solvent extraction [256] and oxidizing [257], thermal [258,259], microwave [260], and biological regeneration [261].…”

Preparation of bioactive aerogel material based on sodium alginate and chitosan for controlled release of levomycetin

“…The antibiotic levomycetin (LC), which has a bacteriostatic effect against many types of Gram‐positive and Gram‐negative bacteria such as rickettsia, spirochetes and some large viruses (pathogens of trachoma, psittacosis, etc. ), as well as bacteria resistant to penicillin, streptomycin, and sulfonamides, 50 was impregnated into aerogels for creating wound healings. The aerogel was kept in an antibiotic solution, washed, and then the rate of release of LC from the aerogel matrix was studied by the spectral method.…”

Occurrence, toxicity and adsorptive removal of the chloramphenicol antibiotic in water: a review

“…Specifically, some functional groups, e.g., –OH, –NH–, C=O, and –NO 2 of chloramphenicol react with oxygen-containing groups, e.g., –COOH, and C=O of the material surface (Zhang et al 2017 ). As a result, hydrogen bond is formed between the surface of adsorbent and chloramphenicol, leading to an enhancement in antibiotic adsorption efficiency (Ahmed et al 2017a , b , c ; Li et al 2018 ). Indeed, Tran et al ( 2019a , b , c ) showed that hydrogen bond between metal–organic framework Fe 3 O(BDC) 3 and chloramphenicol was stronger in acidic solutions, giving the best adsorption efficiency of 11.7 mg L −1 .…”