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Removal of Dyes by Adsorption Process Using Date Pits as Material Environmentally Friendly

Adachi Abderrazzak, El Ouadrhiri Faiçal, El Manssouri Ibtissam, Moussaoui Fatima, El Bourachdi Soukaina, Lahkimi Amal

Ecological Engineering & Environmental Technology

2023

Vol. 24, iss. 8

181--193

This study is based on the use of a natural material in the adsorption process to remove organic pollutants. The objective is to assess its effectiveness in adsorbing the organic pollutant MB from an aqueous solution, while operating in an open system. The DP bioadsorbent was characterized using FTIR and SEM. To determine their effect on adsorption efficiency, a number of variables were examined, including contact time, concentration of pollutant MB, adsorbent mass, pH, temperature, and adsorbent particle size. The effect of these variables on adsorption efficiency shows that a removal rate of 92.66% is achieved under optimum conditions, including a contact time of 35 minutes, a concentration of pollutant MB of 22.5 mg·l-1, an adsorbent mass (mDP) of 1.1 g·l-1 and a solution pH of 5.6. In addition, a progressive decrease in adsorption efficiency is observed with increasing temperature and adsorbent mass. On the other hand, this efficiency increases with increasing a concentration of pollutant MB. Three popular models, the Freundlich, Langmuir, and Dubin-Radushkevich models, have been used to examine the adsorption isotherms of the MB dye on DP. With a correlation factor of 0.98, it was discovered that MB adsorption monitored by the Freundlich isotherm. The Langmuir and Dubinin-Radushkevich models, however, do not adequately describe the data. The kinetic results were studied using the pseudo-first-order and pseudo-second-order equations, and show that MB dye adsorption on DP (adsorbent) follows the pseudo-second-order model. Also estimated were thermodynamic parameters such as (ΔH°), (ΔS°), (ΔG°), enthalpy, entropy, Gibbs free energy respectively to anticipate the character of adsorption. The results indicate that the adsorption process of MB on the bioadsorbent is exothermic. The results derived from the ΔG° values lead to the conclusion that the adsorption of MB occurs spontaneously.

Nowe trendy w opracowaniu serii spektralnych certyfikowanych materiałów odniesienia przeznaczonych dla stopów miedzi - stopy ekologiczne

Müller E., Bolibrzuch B.

Analityka : nauka i praktyka

2012

nr 3

37--42

Instytut Metali Nieżelaznych od ponad 55 lat zajmuje się opracowaniem i wytwarzaniem serii spektralnych certyfikowanych materiałów odniesienia.