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Titolo:
Cation exchange properties of heat-treated Australian brown coal: influences of pre-exchanged calcium ions
Autore:
Murakami, K; Yamada, T; Kaga, K; Fuda, K; Matsunaga, T;
Indirizzi:
Akita Univ, Fac Engn & Resource Sci, Dept Mat Proc Engn & Appl Chem Environm, Akita 0108502, Japan Akita Univ Akita Japan 0108502 Appl Chem Environm, Akita 0108502, Japan
Titolo Testata:
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
fascicolo: 1-3, volume: 193, anno: 2001,
pagine: 153 - 159
SICI:
0927-7757(200112)193:1-3<153:CEPOHA>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
HYDRATED OXIDES; CARBOXYL GROUPS; ACIDIC GROUPS; METAL IONS; ADSORPTION; DECOMPOSITION; COPRECIPITATION; PYROLYSIS; CHROMIUM; IRON;
Keywords:
cation exchange; Australian brown coal; carboxyl groups; pre-exchanged calcium ions; heat treatment;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: Murakami, K Akita Univ, Fac Engn & Resource Sci, Dept Mat Proc Engn & ApplChem Environm, Akita 0108502, Japan Akita Univ Akita Japan 0108502 nvironm, Akita 0108502, Japan
Citazione:
K. Murakami et al., "Cation exchange properties of heat-treated Australian brown coal: influences of pre-exchanged calcium ions", COLL SURF A, 193(1-3), 2001, pp. 153-159

Abstract

Loy Yang brown coals, Australia, with pre-exchanged calcium ions (Ca-LY) or without pre-exchanged calcium ions (LY) were heat-treated at a desired temperature between 50 and 400 degreesC and their exchanged amounts of Co2+ or Mg2+ were measured as a function of pH of the aqueous solution. The exchanged amount of divalent cations for Ca-LY heat-treated at 50 degreesC was larger than that for LY heat-treated at the, same temperature over the wholepH range. In the low pH region between 2 and 4.5, the exchanged amount of divalent cations for LY heat-treated above 250 degreesC was almost zero, while that for Ca-LY heat-treated at the higher temperature such as 300 degreesC was 0. 1 -0.3 mmol g(-1). These results were discussed based on the amounts and the types of the carboxyl groups present on the heat-treated browncoal surfaces. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/11/20 alle ore 00:18:05