Verde de malquita

Páginas: 18 (4354 palabras) Publicado: 23 de junio de 2010
Electronic Journal of Biotechnology
versión On-line ISSN 0717-3458
Electron. J. Biotechnol. v.12 n.4 Valparaíso oct. 2009
|   | Environmental Biotechnology |
Electronic Journal of Biotechnology ISSN: 0717-3458 | Vol. 12 No. 4, Issue of October 15, 2009 |
© 2009 by Pontificia Universidad Católica de Valparaíso -- Chile | Received August 6, 2008 / Accepted June 1, 2009 |
DOI:10.2225/vol12-issue4-fulltext-4 | How to reference this article |
Removal of malachite green from water by Firmiana simplex wood fiberXiangliang Pan
Xinjiang Institute of Ecology and Geography
Chinese Academy of Sciences
Urumqi 830011, ChinaDaoyong Zhang*
State Key Laboratory of Environmental Geochemistry
Institute of Geochemistry
Chinese Academy of SciencesGuiyang, 550002, China
E-mail:*Corresponding authorFinancial support: Knowledge Innovation Program of Chinese Academy of Sciences (KZCX2-YW-335 and KZCX2-YW-135), Program of 100 Distinguished Young Scientists of the Chinese Academy of Sciences , National Natural Science Foundation of China (40673070, 40872169) and 863 program project 2006AA06Z339 from MOST of China.Keywords:adsorption, kinetics, malachite green, thermodynamics, wood fiber. Abbreviations: | MG: malachite green |
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This study shows that wood fiber of Phoenix tree (Firmiana simplex) is an effective adsorbent for malachite green (MG). MG sorption behavior onto the wood adsorbent was investigated in this study. Basic condition wasfavorable for MG adsorption to the adsorbent. The pseudo second order equation well described MG adsorption onto the wood adsorbent. The Freundlich Isotherm could describe the sorption data. The positive value of ΔH0 showed that adsorption of malachite green onto the wood adsorbent was endothermic. The negative values of ΔG at various temperatures indicate the spontaneous nature of the adsorptionprocess.   Article |
References |
Malachite green (MG), a triphenylmethane dye, is used as an antifungal, anti-bacterial, and anti-parasitical therapeutic agent in aquacultures and animal husbandry. It is also widely used as a direct dye for silk, wool, jute and leather. Malachite green has detrimental effects on liver, gill, kidney, intestine and gonads of aquatic organisms (Srivastava et al.2004). When it was inhaled or ingested by human, it may cause irritation to the gastrointestinal tract and even cancer (Garg et al. 2004). Contact of malachite green with skin causes irritation with redness and pain. Intermediate products after degradation of MG are also reported to be carcinogenic (Srivastava et al. 2004). Therefore, the use of malachite green in aquaculture was banned in manycountries. However, MG in fishes, animal milk and other foodstuff is still detected due to illegal use of MG (Srivastava et al. 1995), which alarm the health hazards against human being.Adsorption is the most commonly used method for color removal. Adsorption onto activated carbon is widely practiced for removal of dissolved dyes from wastewater. However, adsorbent-grade activated carbon iscost-prohibitive. So it is necessary to seek some alternative low-cost adsorbents that do not need pretreatment to replace activated carbon (Popuri et al. 2007; Vieira et al. 2007). Recently, a number of low-cost adsorbents for dye removal from mineral wastes (Yener et al. 2006), agricultural wastes, microbial biomass (Aksu, 2005) and higher plant biomass (Ho et al. 2005) were reported in the literature.Among them, biomaterials from higher plants seem to be one type of popular low-cost adsorbents because they usually have higher biomass compared with microbes and are easily available. For example, tree fern (Ho et al. 2005), orange peel (Arami et al. 2005), date pits (Banat et al. 2003), palm kernel fiber, sawdust (Garg et al. 2004), peanut hull (Gong et al. 2005), neem leaf (Bhattacharyy et al....
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