Biocarbon adsorption and TiO2/solar photodecomposition of binary and tertiary antibiotics systems
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2018
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BIOCHAR
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The occurrence of pharmaceutical residues in a polluted environment includes the exposition to a
contaminant mixture including antibiotics rather than individual toxic compounds. Some published
results confirm the detection of a variety of antibiotics in soil and water environment as binary and
tertiary systems which highlight the importance of antibiotics removal study of from a binary and
tertiary mixture. Experimentaly the antibiotic mixture was preheating before adding TiO2 and kept in
a solar radiation chamber with constant temperature and pH values. The collection of the suspension
aliquots allows the photodecomposition control followed by the addition of micronized biocarbon
(diameter < 500 mesh) agitation and centrifugation. The supernatants measurements used
spectrophotometer UV-Vis at λ = 273nm, 261nm, and 373nm to amoxicillin, cephalexin, and
oxytetracycline, respectively. All results indicate the TiO2/solar photodecomposition followed by
biocarbon adsorption have better agreement with pseudo-second-order kinetics. The comparison
between the antibiotics photodecomposition removal percentages of the binary mixtures indicates
higher decomposition for amoxicillin (57,38%), followed by cephalexin (48,04%) and considering
the tertiary antibiotic systems the oxytetracycline (14,63 %). Such removal difference is a result of
the antibiotics chemical structure and bounding energy broken by the hydroxy radicals of the
solar/TiO2 photodecomposition reaction. For amoxicillin, the results refer to break the weak
thiophene sulfur bond, for the cephalexin and oxytetracycline they have to break the strong hydrogen
bonding of amide (amino carbonyls group) and the benzamide bond.The use of the biocarbon
adsorption in the water treatment is final stage ensure the water quality polishing results.
Como referenciar
LIMA, G.N.S.; MORAIS, G.; MACEDO, M.V.; AYOUB, J.M.S.; ORTIZ, N. Biocarbon adsorption and TiO2/solar photodecomposition of binary and tertiary antibiotics systems. In: BIOCHAR, August 20-23, 2018, Wilmington, Delaware, USA. Abstract... Disponível em: http://repositorio.ipen.br/handle/123456789/29735. Acesso em: 20 Mar 2026.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.