Biosorption of Mercury(II) with Different Marine Algae

Abstract

Five species of algae (Lessonia nigrescens Bory, Prionitis decipiens, Grateloupia doryphora, Lessonia trabeculata and Macrocystis integrifolia) collected from Peruvian coast have been tested for mercury recovery from synthetic solutions. Preliminary experiments showed that optimum sorption occurred at pH 6-7 and that Lessonia algae were the most efficient sorbents for Hg(II). The biomass was cross-linked with calcium chloride. Stabilized biosorbent showed sorption capacity as high as 267 mg g-1 at pH 6. The sorption isotherm was described by the Langmuir equation, while the pseudo-second order equation was used for modeling uptake kinetics. Salt addition strongly affected mercury sorption following the sequence: NaNO3 << Na2SO4 <<< NaCl.

Estudio De La Biosorcion De Rojo Ácido 18, Azul Básico 99 Y Amarillo Básico 57 Presentes en Los Tintes De Cabellos Con Residuos De Hojas De Té Verde

“…La biorremediación es una alternativa de remoción de tintes; la biosorción ofrece las ventajas de operación a bajo costo, reducción del volumen de lodos químicos y biológicos, además de que sólo utiliza materia muerta proveniente de microorganismos. Este proceso también permite la regeneración del biosorbente y la 6,7 recuperación del adsorbato . Ante estos problemas, primero, el posible efecto carcinógeno de los tintes en humanos, segundo, la contaminación de las aguas residuales generada por las industrias que usan tintes como materias primas y tercero, la ineficiencia y alto costo de las técnicas convencionales de purificación de aguas, se justifica la búsqueda de tecnologías limpias con nuevos y/o mejorados adsorbentes alternativos.…”

Removal of Mercury from Wastewater by Adsorption Using Thiol-Functionalized Eggshell Membrane

“…Hence, it is increasing importance to the remove and recovery of mercury from hazardous wastewaters before they are discharged into the environment and to provide a requalification of polluted natural water bodies. The conventional treatment methods for mercury-contained effluents include algae, chitosan, fly-ach bed, ion-exchange and activated carbon adsorption [5][6][7][8][9]. Despite the fact that a variety of treatment methods are available, there is still a lack of effective, cheap means for the treatment of mercury containing wastewaters.…”