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Interference effects of oxyanions commonly found in natural waters on the catalytic reduction of nitrate in water.
Sacco, Nicolás Alejandro; Zoppas, Fernanda Miranda; Beltrame, Thiago Favarini; Miró, Eduardo Ernesto; Marchesini, Fernanda Albana.
Afiliação
  • Sacco NA; INCAPE (UNL-CONICET), Facultad de Ingeniería Química, Instituto de Investigaciones en Catálisis Y Petroquímica, Santiago del Estero 2829, 3000, Santa Fe, Argentina.
  • Zoppas FM; INCAPE (UNL-CONICET), Facultad de Ingeniería Química, Instituto de Investigaciones en Catálisis Y Petroquímica, Santiago del Estero 2829, 3000, Santa Fe, Argentina.
  • Beltrame TF; Laboratório de Corrosão, Proteção e Reciclagem de Materiais LACOR-UFRGS (Universidade Federal Do Rio Grande Do Sul), Av. Bento Gonçalves, Porto Alegre, RS, 9500, Brazil.
  • Miró EE; INCAPE (UNL-CONICET), Facultad de Ingeniería Química, Instituto de Investigaciones en Catálisis Y Petroquímica, Santiago del Estero 2829, 3000, Santa Fe, Argentina.
  • Marchesini FA; INCAPE (UNL-CONICET), Facultad de Ingeniería Química, Instituto de Investigaciones en Catálisis Y Petroquímica, Santiago del Estero 2829, 3000, Santa Fe, Argentina. albana@fiq.unl.edu.ar.
Environ Sci Pollut Res Int ; 30(13): 37462-37474, 2023 Mar.
Article em En | MEDLINE | ID: mdl-36574122
In this work, the influence of oxyanions on the catalytic reduction of nitrates using formic acid as the reducing agent was studied as well as the influence of bicarbonate, sulfate, and phosphate co-anions on the catalytic nitrate reduction with Pd:In/Al2O3 (1:0.25 wt.%). A negative effect on nitrate conversion was observed in the following order: phosphate > sulfate > bicarbonate, showing a strong influence of electrostatic adsorption on the catalytic reduction of nitrate. However, no direct trend was observed relating the levels of interferents to the impact on the selectivity of the bimetallic catalyst using formic acid as a reducing agent. For both bicarbonate and phosphate, at lower levels, higher selectivity to nitrogen was obtained than for the reaction in the absence of interferents. On the other hand, increasing sulfate concentration led to a decrease in nitrate conversion. The mixtures of co-anions also showed a decrease in the catalytic activity. At 120 min, a N2 selectivity higher than 95% was obtained, except for the C50-S20 (bicarbonate 50 ppm-sulfate 20 ppm) mixture which showed the lowest selectivity to N2 value (87.3%). The loss of catalyst activity was found to be reversible and not permanent.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Água / Nitratos Idioma: En Revista: Environ Sci Pollut Res Int Assunto da revista: SAUDE AMBIENTAL / TOXICOLOGIA Ano de publicação: 2023 Tipo de documento: Article País de afiliação: Argentina País de publicação: Alemanha

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Água / Nitratos Idioma: En Revista: Environ Sci Pollut Res Int Assunto da revista: SAUDE AMBIENTAL / TOXICOLOGIA Ano de publicação: 2023 Tipo de documento: Article País de afiliação: Argentina País de publicação: Alemanha