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Facile synthesis of MnO x ‐loaded biochar for the removal of doxycycline hydrochloride: effects of ambient conditions and co‐existing heavy metals
Author(s) -
Liu Sijia,
Liu Yunguo,
Tan Xiaofei,
Liu Shaobo,
Li Meifang,
Liu Ni,
Yin Zhihong,
Tian Sirong,
Zhou Yahui
Publication year - 2019
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.6000
Subject(s) - adsorption , biochar , chemistry , metal , ionic strength , metal ions in aqueous solution , nuclear chemistry , pyrolysis , zeta potential , specific surface area , water treatment , inorganic chemistry , aqueous solution , nanoparticle , chemical engineering , organic chemistry , catalysis , environmental engineering , engineering
BACKGROUND In this study, manganese oxide (MnO x ) nanoparticle loaded biochar (BC) was applied for doxycycline hydrochloride (DOX) removal from water. Biochar composites were synthesized by either pre‐treating biomass using MnCl 2 /KMnO 4 /NaOH (PMBC) or inserting MnO x ultrafine particles after pyrolysis of biomass (AMBC). In complex water environments, the presence of heavy metals may affect the removal of antibiotics. Cu(II) and Cr(VI) were used to study their effect on DOX removal. RESULTS The BC loaded with MnO x exhibited superior adsorption properties for DOX. The adsorption capacity of AMBC and PMBC was ≈93 mg/g and 104 mg g −1 , respectively, which was about nine‐ and ten‐fold higher than that of raw BC (11.48 mg g −1 ). The characterization indicated that AMBC and PMBC had better surface structure and more surface functional groups than raw BC. The main mechanisms for DOX adsorption onto PMBC were surface complexation, H‐bond, π–π interaction and electrostatic interaction. DOX removal by PMBC also involved its degradation effect on DOX. Adsorption experiments were carried out with the influence of pH, ionic strength and background electrolyte. The presence of Cu(II) obviously enhanced the DOX adsorption capability through Cu(II) bridging effect, whereas the presence of Cr(VI) significantly inhibited DOX adsorption through competitive adsorption and electrostatic repulsion. CONCLUSIONS The results suggested that PMBC could be implemented as a cost‐effective and environmentally friendly adsorbent for DOX removal from water. Heavy metal ions can obviously enhance or weaken the adsorption ability of PMBC for DOX. © 2019 Society of Chemical Industry