首页|Removal of amoxicillin from water by concrete-based hydrotalcites: Efficiency and mechanism
Removal of amoxicillin from water by concrete-based hydrotalcites: Efficiency and mechanism
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Amoxicillin(AMX)is a widely used broad-spectrum antibiotic whose presence in the environment has been widely concerned.In this work,two kinds of concrete-based hydrotalcites,C-LDH and Fe~(2+)-C-LDH,were synthesized to remove AMX.C-LDH was used to adsorb AMX while Fe~(2+)-C-LDH was employed to activate potassium persulfate(PDS)to degrade AMX.The adsorption characteristics of C-LDH for AMX were investigated,and the formula of Fe~(2+)-C-LDH-PDS system was optimized.The removing mechanisms of AMX removal by C-LDH and Fe~(2+)-C-LDH-PDS system were analyzed.C-LDH showed good performance for AMX adsorption as initial pH between 3-5,with maximum adsorption capacity of 49.7 mg/g.The C-LDH adsorbent could be regenerated by Na2CO3 elution.Fe~(2+)-C-LDH exhibited good activity on PDS activation for AMX degradation,and could be used repeatedly.The optimum mass ratio of Fe~(2+)-C-LDH to PDS was 2.6.C-LDH removed AMX through the electrostatic interaction and hydrogen bonding,while Fe~(2+)-C-LDH-PDS degraded AMX by radical reaction.Concrete-based hydrotalcites illuminate a cheap and sustainable way for the removal of antibiotics.
Concrete based hydrotalcitesAntibioticsAdsorptionPersulfateRegeneration
Xiao Liu、Sen Yang、Tingjuan Feng
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College of Civil and Architectural Engineering,North China University of Science and Technology,Tangshan 063210,China
NSTL
