Voltar
Artigo Revisado por pares
BIBTEX RIS

Oxidation of ammonia by ferrate(vi)

1998; Volume: 33; Issue: 4 Linguagem: Inglês

10.1080/10934529809376752

ISSN

1532-4117

Autores

Virender K. Sharma, John T. Bloom, Vishwas N. Joshi,

Tópico(s)

Mine drainage and remediation techniques

Resumo

Abstract The kinetics of ammonia oxidation by ferrate(VI) was determined as a function of pH (7.5–11.0) and temperature (10–35 °C). The rates decrease with increase in pH. The pH dependence is probably related to protonation of ferrate(VI) and ammonia. The theoretical curve through data gave the rate constants; k7(HFeO4 ‐ + NH4 +) = 8.46±0.50x10‐1 M‐1s‐1; kg(FeO4 2‐ + NH4 +) = 1.26±0.11x10‐1 M‐1s‐1; k10(FeO4 2‐ + NH3) = 1.19±0.10x10‐1 M‐1s‐1. The activation parameters, ?H? and ?S? were found to be 67.3 ± 3.5 kJ/mol and 33.1 ± 0.2 J/mol.K, respectively. When ferrate(VI) was used in excess relative to ammonia in the oxidation reaction, 22 % of ammonia removal was achieved. The usefulness of ferrate(VI) to remove ammonia from wastewater is discussed.

Referência(s)