Idioma:

Reactivation Process of Activated Carbons: Effect on the Mechanical and Adsorptive Properties

B Cevallos Toledo, Rita ; F Aragón-Tobar, Carlos ; Gámez, Sebastián ; de la Torre, Ernesto

Molecules (Basel, Switzerland), 2020-04, Vol.25 (7), p.1681 [Periódico revisado por pares]

Switzerland: MDPI AG

Texto completo disponível

Citações Citado por

Enviar para

Título:
Reactivation Process of Activated Carbons: Effect on the Mechanical and Adsorptive Properties
Autor: B Cevallos Toledo, Rita ; F Aragón-Tobar, Carlos ; Gámez, Sebastián ; de la Torre, Ernesto
Assuntos: Abrasion ; Abrasion resistance ; Acids ; Activated carbon ; Activation ; Adsorption ; Adsorptivity ; Carbon ; Charcoal - chemistry ; Efficiency ; Effluent treatment ; Food industry ; Food processing industry ; Gold ; Gold - chemistry ; Heat treatment ; Hydrometallurgy ; Iodine ; Iodine - chemistry ; Kinetics ; Leaching ; Mechanical properties ; Metals ; Pollutants ; Pulp ; reactivation ; Sulfuric acid ; Surface area ; Surface chemistry ; Temperature ; Wastewater treatment
É parte de: Molecules (Basel, Switzerland), 2020-04, Vol.25 (7), p.1681
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Descrição: Carbon reactivation is a strategy to reduce waste and cost in many industrial processes, for example, effluent treatment, food industry, and hydrometallurgy. In this work, the effect of physical and chemical reactivation of granular activated carbon (AC) was studied. Spent activated carbon (SAC) was obtained from a carbon in pulp (CIP) leaching process for gold extraction. Chemical and physical reactivations were evaluated using several acid-wash procedures (HCl, HNO , H SO ) and thermal treatment (650-950 °C) methods, respectively. The effect of the reactivation processes on the mechanical properties was evaluated determining ball pan hardness and normal abrasion in pulp resistance. The effect on the adsorptive properties was evaluated via the iodine number, the gold adsorption value ( expressed in mg Au/g AC), and Brunauer-Emmett-Teller (BET) surface area. Initial characterization of the SAC showed an iodine number of 734 mg I /g AC, a value of 1.37 mg Au/g AC, and a BET surface area of 869 m /g. The best reactivation results of the SAC were achieved via acid washing with HNO at 20% / and 50 °C over 30 min, and a subsequent thermal reactivation at 850 °C over 1 h. The final reactivated carbon had an iodine number of 1199 mg I /g AC, a value of 14.9 mg Au/g AC, and a BET surface area of 1079 m²/g. Acid wash prior to thermal treatment was critical to reactivate the SAC. The reactivation process had a minor impact (<1% change) on the mechanical properties of the AC.
Editor: Switzerland: MDPI AG
Idioma: Inglês

Links

View this record in MEDLINE/PubMed

Voltar para lista de resultados

Resultado 1 Avançar Ir para próxima página

Realização: Logos de Redes Sociais:

Reactivation Process of Activated Carbons: Effect on the Mechanical and Adsorptive Properties

B Cevallos Toledo, Rita ; F Aragón-Tobar, Carlos ; Gámez, Sebastián ; de la Torre, Ernesto

Switzerland: MDPI AG

Buscando em bases de dados remotas. Favor aguardar.