Superficial properties of activated carbon fiber catalysts produced by green synthesis and their application in water purification

BELTRAME, T. F.; MIRÓ, E. E.; SOSA, F. A.; MARCHESINI, F. A.; ZOPPAS, F. M.; BERNARDES, A. M.

ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH

SPRINGER HEIDELBERG

Lugar: HEIDELBERG; Año: 2020

0944-1344

Catalysts of Pd-In supported on activated carbon fiber were synthesized, characterized, and evaluated for the removal of nitrogen oxyanions from water. The work was carried out aiming the development of a green synthesis process, and the studies were accomplished with the following objectives: (a) to evaluate whether catalysts produced by wet impregnation (WI) and autocatalytic deposition (AD) have enough catalytic activity for the removal of oxyanions in water; (b) to determine the efficiency of ion removal using formicacidasa reducingagent;(c) todetermine which synthesis methodproduceslesswaste.Itwasfound thatthe twosynthesis processes modifiedthe properties ofthe support andthatthe distributionofthe particles ofthe metallic phase was of the nanometric order, being these particles found predominantly at the support surface. By using formic acid as a reducing agent, although low nitrate conversions were obtained (32%), a selectivity to N2 higher than 99% was achieved. These findings were attributed to the low decomposition of formic acid on the catalyst surface. The Pd:In (0.45:0.2) catalyst prepared by WI was the most suitable for the catalytic reduction of both nitrate and nitrite oxyanions. Regarding the green point of view of the synthesis method, catalysts prepared by WI generated less waste.