Bio-adsorbents for the Removal of Heavy Metals from Water

Abstract

The work represents the bio-adsorption of arsenic(III) from standard solutions and real water samples using a powdered avocado seed as a bio-adsorbent. The adsorbent was synthesized, demineralized, and characterized by X-ray diffraction (XRD), scanning electron microscope coupled with energy dispersive spectroscopy (SEM-EDS), Fourier transformation infrared spectroscopy (FTIR), and Brunauer-Emmett-Teller (BET) theory. Batch adsorption studies were carried out by using avocado seed, and As III was analyzed by using inductively coupled plasma optical emission spectroscopy (ICPOES) after optimizing the following parameters: pH 6, analyte concentration 2 mg L À1 , bio-adsorbent dosage 0.8 g, contact time 120 min between analyte and adsorbent, and temperature from 22 to 40 C. The adsorption capacity of 93.75 mg/g was obtained, and the Langmuir isotherm was adopted by the adsorbent due to the chemisorption that occurs on the surface between the functional groups of the bio-adsorbent and As III .

Removal of a dye used in the textile industry using avocado seed Hass variety as a bio-adsorbent

“…Actualmente, el Perú es uno de los principales exportadores de palta a nivel mundial [8], [9], siendo Arequipa uno de los departamentos del Perú que se dedica al cultivo de palta. Los residuos de la palta corresponden a las cáscaras y a las pepas que son desechadas sin uso alguno, pese a que estudios han demostrado su potencial aplicación para remover contaminantes del medio ambiente como cromo, plomo [10], cadmio [11] y arsénico [12] de forma natural [10] o mediante modificaciones físicas como la elaboración de carbón activado [11], [13]- [15]. Por tal motivo, en la presente investigación tuvo como principal objetivo utilizar residuos de pepa de palta variedad Hass como potencial bio-adsorbente para remover el colorante Novacron Navy FNB de aguas contaminadas a escala de laboratorio, esto con la finalidad de promover más estudios sobre este biomaterial en relación a su capacidad en la remoción de contaminantes ambientales.…”

Synthesis of Dendritic Magnetic Graphene Oxide By Radical Polymerization As Adsorbent For Rapid Removal of Malachite Green From Aqueous Solutions

“…Among the suggested techniques, adsorption is an appropriate method which has provided good results because it is efficient, simple, and cost-effective [11]. Therefore, this issue has made researchers to seem for a few adsorbents with high accessibility and cost-effectiveness.…”