| Title of Article |
Thermodynamic and Kinetic Study of the Intrinsic Adsorption Capacity of Graphene Oxide for Malachite Green Removal from Aqueous Solution |
| Date of Acceptance |
26 September 2014 |
| Journal |
| Title of Journal |
Oriental Journal of Chemistry |
| Standard |
ISI |
| Institute of Journal |
Oriental Scientific Publishing Co., Bhopal. |
| ISBN/ISSN |
ISSN: 0970-020X |
| Volume |
30 |
| Issue |
4 |
| Month |
September |
| Year of Publication |
2014 |
| Page |
1463-1474 |
| Abstract |
Graphene oxide (GO) was produced from bare graphite (BGP) material and was used as
an intrinsic adsorbent for the removal of malachite green (MG) from aqueous solution. In an
optimization study, the effects of the initial concentration of MG, solution pH, adsorbent dosage,
contact time and ionic strength were investigated in detail. The water-soluble dye was analyzed at
a maximum wavelength of 618 nm. The optimum conditions for MG removal from aqueous solution
included a 300 mg/L initial concentration with 0.02 mg adsorbent at pH 5.1, and complete adsorption
equilibrium was reached within 40 min. The maximum adsorption capacity of GO for MG was
384.62 mg/g, dramatically higher (over 10 times) than that of BGP (28.73 mg/g).The adsorption
process followed pseudo-second-order kinetics. Thermodynamic data demonstrated that dye
adsorption onto the GO surface was mainly an exothermic spontaneous reaction. The remarkably
different adsorption isotherms for GO and BGP fit well with the Langmuir and Freundlich models,
respectively. It is therefore evident that the prepared GO can be used as a highly effective
adsorbent for this toxic dye. |
| Keyword |
Graphene oxide; Malachite green; Adsorption isotherm; Thermodynamic;Kinetic |
| Author |
|
| Reviewing Status |
มีผู้ประเมินอิสระ |
| Status |
ตีพิมพ์แล้ว |
| Level of Publication |
นานาชาติ |
| citation |
false |
| Part of thesis |
true |
| Attach file |
|
| Citation |
2
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