scispace - formally typeset
Search or ask a question
Author

Otheman Amrhar

Bio: Otheman Amrhar is an academic researcher from Ibn Tofail University. The author has contributed to research in topics: Adsorption & Freundlich equation. The author has an hindex of 2, co-authored 4 publications receiving 26 citations.

Papers
More filters
01 Jan 2015
TL;DR: In this article, it was shown that the physisorption est le mecanisme approprie de l'adsorption de Bleu de Methylene (MB) sur l'argile illitique naturelle (NIC).
Abstract: L'adsorption du Bleu de Methylene (MB) a partir d’une solution aqueuse sur une argile illitique naturelle (NIC) a ete etudiee et les isothermes d'equilibre ont ete determinees. Les donnees experimentales obtenues a des differentes concentrations initiales ont ete analysees en utilisant six modeles d’isotherme.Afin de determiner la meilleure isotherme convenable, cinq fonctions d’erreur ont ete employees pour evaluer les resultats par la methode de la regression non lineaire.L'analyse d'erreur a montre que le modele Redlich-Peterson est le model convenable a decrire les donnees d'adsorption de MB sur le NIC. En outre, la nature d'adsorption de MB sur NIC a ete determinee a partir des parametres d'isotherme, et elle est conclue que la physisorption est le mecanisme approprie de l’adsorption de Bleu de Methylene (MB) sur l’argile illitique naturelle (NIC).

34 citations

Journal ArticleDOI
TL;DR: A review of the major ad-sorption isotherm models based on statistical physics can be found in this article, where steric, energetic, and thermodynamic parameters are discussed.
Abstract: Adsorption is a major basic and applied phenomenon in many scientific disciplines. In particular, the design of adsorbents to remove pollutants from wastewater requires advanced knowledge of adsorption isotherms, which are useful tools to identify physicochemical factors that control adsorption performance. Recent modeling of adsorption isotherms has focused on the use of statistical physics. Here, we review the major adsorption isotherm models based on statistical physics. We discuss steric, energetic, and thermodynamic parameters.

30 citations

Journal ArticleDOI
TL;DR: The ability of Natural Muscovite Clay (NMC) to adsorb Methylene Blue (MB) as a dye widely used in the industrial sector was investigated in this article.
Abstract: The ability of Natural Muscovite Clay (NMC) to adsorb Methylene Blue (MB) as a dye widely used in the industrial sector was investigated, and the adsorption process was interpreted at the molecular...

18 citations

Journal ArticleDOI
TL;DR: In this paper, Natural Calcium Carbonate (NCC) was used as an adsorbent in the removal of Zn 2+, from aqueous solution by a batch adsorption technique.
Abstract: In this study, Natural Calcium Carbonate (NCC) that was characterised by X-ray diffraction has been used as an adsorbent in the removal of Zn 2+ , from aqueous solution by a batch adsorption technique. The effects of various experimental parameters such as solution PH, initial concentration of solution, contact time, adsorbent masses and stirring speed were investigated. The results showed that basic PH and the average stirring speed were favourable for the adsorption of Zn 2+ , and the adequate equilibrium time for the adsorption of Zn 2+ onto Natural Calcium Carbonate was 80min. The experimental data were analysed by the linear form of Langmuir, Freundlich. Isotherm models and showed a good fit with the Langmuir isotherm model. Adsorption kinetic was studied using pseudo first order kinetic equation, second order kinetic equation. The adsorption kinetic followed the pseudo second order equation. Â
Journal ArticleDOI
TL;DR: In this paper , the adsorption proprieties of two anionic dyes, i.e., acid yellow 36 (AY36) and acid orange 6 (AO6), on the (1 1 0) surface of rutile titanium dioxide (TiO2) in an aqueous medium were investigated using computational methods.

Cited by
More filters
Journal ArticleDOI
TL;DR: In this paper, the authors present an overall review of the applications of adsorption isotherms, the use of linear regression analysis, nonlinear regression analysis and error functions for optimum adorption data analysis.
Abstract: The need to design low-cost adsorbents for the detoxification of industrial effluents has been a growing concern for most environmental researchers. So modelling of experimental data from adsorption processes is a very important means of predicting the mechanisms of various adsorption systems. Therefore, this paper presents an overall review of the applications of adsorption isotherms, the use of linear regression analysis, nonlinear regression analysis, and error functions for optimum adsorption data analysis.

1,535 citations

Journal ArticleDOI
TL;DR: In this article, the results of research undertaken using various NMs in the sequestration of Cr (VI) from wastewater have been reviewed and the functionalization of these NMs has been discovered to enhance their characteristics, hence improving the sorption capacity of NMs for CrVI sorption.
Abstract: Heavy metals contamination has become a global environmental problem owing to anthropogenic sources. They are considered a stern threat to humans, aquatic life, and harmful pollutants to water resources due to their toxicity and carcinogenicity. Nanomaterials (NMs) have been used extensively from the available diversity of sorbents for heavy metals removal from wastewater. This review looks at the results of research undertaken using various NMs in the sequestration of Cr (VI). NMs have shown to be efficient and effective for the treatment of wastewater polluted by Cr (VI) owing to their unique properties like surface effect and quantum effect. Besides their large surface area, they also show exclusive characteristics like higher capacity, higher specificity, higher affinity, self-assembly, great reactivity, and catalytic-potential, making them superior adsorbing materials than traditional materials for Cr (VI) removal. The functionalization of these NMs was discovered to enhance their characteristics, hence improving the sorption capacity of NMs for Cr (VI) sorption. From previous studies reported, synthesized NMs had high sorption capacity for Cr (VI) and high retention of the sorbate metals. The Cr (VI) sorption onto various NMs or its functionalized materials were observed to depend on the pH, quantity of sorbent, contact time and temperature. The Langmuir isotherm and pseudo-second-order kinetic models best depicted the equilibrium data of the sorption processes. The determined sorption capacity of the various NMs for Cr (VI) sorption determined from the Langmuir model ranged from 3.197 to 666.67 mg/g for carbon nanomaterials, 8.67–1052.63 mg/g for metal and metals oxide NMs and 59.17–854.7 mg/g for polymers composite.

75 citations

Journal ArticleDOI
05 Dec 2018
TL;DR: In this paper, the detailed mechanism of adsorption, as well as photo catalysis has been presented in order to understand the characteristics of the adaption process and the photo-catalysis process.
Abstract: Adsorption and photo catalysis are the most popular methods applied for the reduction of amount of pollutants that enter water bodies. The main challenge in the process of adsorption is the demonstration of the experimental data obtained from sorption processes. For many decades most of the researchers used adsorption and kinetic of adsorption as a repetitive work to describe the adsorption data by using common models such as, Langmuir and Freundlich for adsorption isotherms; PFO and PSO models for kinetics. This has been done without careful evaluation of the characteristics of adsorption process. It has been well understood that adsorption does not degrade the pollutant to eco-friendly products and photo catalysis will not degrade without adsorption of the pollutant on the catalyst. Therefore, understanding the detailed mechanism of adsorption, as well as, photo catalysis has been presented in this paper. During photo catalysis: modification towards suppression of electron-hole recombination, improving visible light response, preventing agglomeration, controlling the shape, size, morphology, etc. are the most important steps. This mini review also widely discusses the key points behind adsorption and photo catalysis.

64 citations

Journal ArticleDOI
TL;DR: The study suggests that the degree of determination of linear regression alone cannot be used for comparing the best fitting of Langmuir and Freundlich models and non-linear error analysis needs to be done to avoid inaccurate results.

44 citations

Book ChapterDOI
01 Jan 2021
TL;DR: Adsorption is the separation process of guest molecules from the environment to the bulk or surface of the solid or liquid phase as discussed by the authors, where the unique features of adsorption, such as low cost and ease of operation coupled with high efficiency, render it superior among other separation and purification techniques such as photoremediation, membrane technology, ion exchange, and electrochemical separation.
Abstract: Adsorption is the separation process of guest molecules from the environment to the bulk or surface of the solid or liquid phase. The unique features of adsorption, such as low cost and ease of operation coupled with high efficiency, render it superior among other separation and purification techniques such as photoremediation, membrane technology, ion exchange, and electrochemical separation. In this chapter, at first, we introduced the fundamental of the adsorption and desorption process along with various types of adsorption, then we outlined the parameters that control the adsorption progress. Finally, the common adsorption isotherms and kinetics equations with different numbers of coefficients were reviewed.

37 citations