Oreganum Stalks as a New Biosorbent to Remove Textile Dyes from Aqueous Solutions

Abstract

In the present study, Oreganum onites L. stalks in natural and chemically modified with HNO 3 and H 3 PO 4 used as adsorbent for removal of both acidic and basic dyes from waters. The adsorption was studied as a function of pH and contact time by batch method. All tested biosorbents were characterized by FT-IR, scanning electron microscopy, and measuring the pH dependence of the zeta potential. The adsorption isotherms were fitted to Langmuir isotherm. The maximum adsorption capacity of dyes was 280.73 mg g À1 for Basic Red 18, 147.06 mg g À1 for methylene blue and 112.36 for Acid Red 111, which is comparable to that of other lignocellulosic materials. The modification process was considerably increased the biosorption capacity of lignocellulosic material, resulting in a 56-63% increase in the biosorption capacity of basic dyes and a 125% increase in the biosorption capacity of acidic dye. The present study illustrated that the most effective factors in the adsorption of basic dye were surface charge and acidic groups on lignocellulosic biosorbents, while non-electrostatic forces as well as electrostatic forces were also effective in the adsorption of acidic dye. In conclusion, Oreganum stalks can be considered as a very prospective adsorbent for the removal of tested basic and acidic dyes.

Investigation of Electrokinetic Properties of Natural Vine Stem Dispersions as Biosorbent

“…Also, the H + adsorption could be occured on the negative charge centers at low pH. A similar trend was observed both in the oreganum stalks which were a kind of lignocellulosic waste and the biomass R. fraxinea 15,26 . Electrolyte concentration effect: Fig.…”

“…The properties of this material are given in Table-1. The adsorbent was characterized as explained in our previous study 15 .…”

Surface Modified Activated Carbons: Sustainable Bio-Based Materials for Environmental Remediation

“…Modified ACs were used to study the removal of colors in addition to metal ions. Ayan et al [58] used origanum onites stalks in their pristine and acid-modified forms using HNO 3 and H 3 PO 4 solutions as adsorbents to remove Basic Red 18 and methylene blue from water. They recorded that the modified ACs increased the adsorption capacity by 56-63% for Red 18 dye and 125% for methylene blue dye.…”

Study of Biosorbents for Removal of Dyes and Metals

“…It had been found that the response was unconstrained and exothermic in nature. One of the studies demonstrates that Oreganum onites stalks were utilized as adsorbent for expulsion of both acidic and fundamental dyes from water [117]. All tried biosorbents were examined by FT-IR, electron microscopy and measuring the pH reliance of the zeta potential.…”