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Comparative study of rice husk biochars for aqueous antibiotics removal
Author(s) -
Zeng Zhiwei,
Tian Sirong,
Liu Yunguo,
Tan Xiaofei,
Zeng Guangming,
Jiang Luhua,
Yin Zhihong,
Liu Ni,
Liu Shaobo,
Li Jiang
Publication year - 2018
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.5464
Subject(s) - biochar , adsorption , chemistry , husk , tetracycline antibiotics , antibiotics , tetracycline hydrochloride , aqueous solution , tetracycline , nuclear chemistry , ciprofloxacin hydrochloride , langmuir , langmuir adsorption model , ciprofloxacin , organic chemistry , biochemistry , botany , biology , pyrolysis
Abstract BACKGROUND Antibiotics are widely used for the treatment of bacterial infections in humans and animals, but it can be released into water sources due to incomplete metabolism in humans or via discharge from drug manufacturers. RESULTS The efficiency of removal of three antibiotics was enhanced with increasing biochar dosage. The adsorption of three antibiotics by RH700 was much higher than by RH300 and RH500, which might be due to the larger surface area and adsorption pore volume of RH700 (211.76 m 2 g ‐1 and 6.25 nm, respectively). In addition, the adsorption capacity was greatly affected by the solution pH, background electrolyte and humic acid. The kinetics experiment data were well fitted by the pseudo‐second‐order kinetic model. The maximum adsorption capacities of tetracycline hydrochloride (TC), doxycycline hydrochloride (DC) and ciprofloxacin (CF) based on the Langmuir model by RH700 at 318 K were 80.9, 85.2 and 36.1 mg g ‐1 , respectively. RH700 exhibited high affinity for antibiotics, mainly ascribed to the chemical interaction between oxygen‐containing functional groups (phenolic hydroxyl group, carboxyl and alkoxy groups) of the biochar surface and TC, DC and CF. CONCLUSION The rice husk biochar produced at high temperature could be applied as a potential adsorbent for removal of antibiotics from water. © 2017 Society of Chemical Industry