2008
DOI: 10.4067/s0718-07642008000100009
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Remoción de Cromo (VI) en Solución Acuosa por la Biomasa Celular de Paecilomyces sp.

Abstract: ResumenEl objetivo de este trabajo fue determinar la remoción de Cromo (VI) en solución por la biomasa celular del hongo contaminante ambiental Paecilomyces sp. por el método colorimétrico de la difenilcarbazida. La mayor bioadsorción fue a pH= 1.0±0.2, a 50 o C durante 16 horas con 7.2 mg/200 mL de concentración inicial de Cromo (VI) y 80 mg/200 mL de biomasa celular. Se concluye que la biomasa fúngica remueve adecuadamente Cromo (VI) en solución y puede utilizarse para descontaminar nichos acuáticos contamin… Show more

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Cited by 8 publications
(7 citation statements)
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References 15 publications
(16 reference statements)
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“…removal of Cr (VI) in the Synthetic Residual Waters. For this, it should be noted that the optimum pH obtained for this removal according to number 3.3 was 2.0 pH units, in this condition the species of Cr (VI), according to Rollinson (1973, cited in Acosta et al, 2010 [24] is in the aqueous solution as (HCrO4) − , (Cr2O7) −2 , (CrO4) − and that the pHpzc was 3.95 indicating that the load of the surface of the CP is positive with respect to the optimum pH of 2.0, which is lower than the zero load point of the CP [17]; for this reason, the removal occurs by electrostatic interactions, as illustrated in Figure 5: OH: coming from the lignin and cellulose Figure 5. Cr (VI) adsorption mechanism with CP surface proposed by authors.…”
Section: Total Active Sites Ph Pzcmentioning
confidence: 81%
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“…removal of Cr (VI) in the Synthetic Residual Waters. For this, it should be noted that the optimum pH obtained for this removal according to number 3.3 was 2.0 pH units, in this condition the species of Cr (VI), according to Rollinson (1973, cited in Acosta et al, 2010 [24] is in the aqueous solution as (HCrO4) − , (Cr2O7) −2 , (CrO4) − and that the pHpzc was 3.95 indicating that the load of the surface of the CP is positive with respect to the optimum pH of 2.0, which is lower than the zero load point of the CP [17]; for this reason, the removal occurs by electrostatic interactions, as illustrated in Figure 5: OH: coming from the lignin and cellulose Figure 5. Cr (VI) adsorption mechanism with CP surface proposed by authors.…”
Section: Total Active Sites Ph Pzcmentioning
confidence: 81%
“…On the other hand, with the above data we propose the adsorption mechanism to explain the removal of Cr (VI) in the Synthetic Residual Waters. For this, it should be noted that the optimum pH obtained for this removal according to number 3.3 was 2.0 pH units, in this condition the species of Cr (VI), according to Rollinson (1973, cited in Acosta et al, 2010) [24] is in the aqueous solution as (HCrO4) − , (Cr2O7) −2 , (CrO4) − and that the pHpzc was 3.95 indicating that the load of the surface of the CP is positive with respect to the optimum pH of 2.0, which is lower than the zero load point of the CP [17]; for this reason, the removal occurs by electrostatic interactions, as illustrated in Figure 5: According to Figure 4, the optimum pH of adsorption of Cr (VI) was 2.0, due to the presented higher percentage of removal of contaminant. Table 2 reports the values obtained from the total active sites of acid and basic character present in the surface of the CP and the potential of zero charge pH pzc .…”
Section: Total Active Sites Phpzc Acids (Mmol × G −1 )mentioning
confidence: 85%
“…Para la realización de esta investigación se usaron los siguientes equipos: incubadora tipo Shaking incubator IN-666, tamizadora tipo Shaker, molino de cuchillas, medidor de pH/ iones, balanza analítica de precisión, 0,001g, Horno modelo IFA-54-8 Marca Escode (400-600°C). Para preparar el agua sintética, 0,8g de Pb(NO 3 ) 2 y 0,8g de CdSO 4 se disolvieron en 8L de agua desionizada, respectivamente, obteniendo una concentración de 100ppm, valor utilizado por algunos investigadores para estudios similares a escala de laboratorio [32]. Además de agua destilada, se utilizó hidróxido de sodio y ácido clorhídrico para ajuste de pH y preparación de las biomasas residuales modificadas.…”
Section: Metodologíaunclassified
“…Existen dos fuentes principales de metales pesados, la natural y antropogénica; la primera incluye intemperismo de rocas (Kaizer & Osakwe, 2010) y actividad volcánica (Amaral, Cruz, Cunha & Rodrigues, 2006) mientras que la fuente antropogénica son acciones provocadas por el hombre, que se pueden englobar en cinco categorías: las actividades industriales, agrícolas (pesticidas y herbicidas), disposición de residuos, minería y metalurgia. La contaminación ocasionada por los residuos derivados de éstas, se definirá por la estabilidad química y la solubilidad de los metales pesados de las que dependerá una amplia variedad de impactos en la salud humana y el ambiente (Akpor et al, 2014;Covarrubias & Peña Cabriales, 2017;Acosta et al, 2010;Bankar & Nagaraja, 2018;Burakov et al, 2018;Sardar et al, 2013). Es importante destacar que la contaminación por metales pesados es uno de los problemas más graves en los entornos marinos, terrestres y de agua dulce (Valdman, Erijman, Pessoa & Leite, 2001;Ansari & Malik, 2007).…”
Section: Metales Pesadosunclassified