Papers by Mohamed Berradi
Materials Today: Proceedings, 2021
Abstract In this study, we applied the modified cationic resin Amberlite®IRC-50 as a biopolymer a... more Abstract In this study, we applied the modified cationic resin Amberlite®IRC-50 as a biopolymer adsorbent in the technique of adsorption of cationic dyes such as methyl blue (BM) and Safranin (SF) contained in wastewater models. During this technique, we studied the effects of the adsorbent dose and the neutral pH = 6.5 on the adsorption performance, knowing that the mass transfer mechanism was studied using a mass of 0.1 g of the adsorbent Amberlite®IRC50 and a concentration of 20 mg/L for the two colorants MB and SF. The results obtained with regard to the adsorption of these dyes from the present resin have shown that the modification of the surface of the cationic resin Amberlite®IRC-50 has a significant effect on the absorption and its increase has also shown that this process is more compatible with the pseudo-kinetics of the linear second degree model.
Environmental Monitoring and Assessment
Journal of Molecular Liquids
Materials Chemistry and Physics
International Journal of Diabetes in Developing Countries, 2015
Dear Sir, In the study conducted by Nagarathna et al. [1], it was observed that yoga-based life s... more Dear Sir, In the study conducted by Nagarathna et al. [1], it was observed that yoga-based life style modification programme is similar to exercise-based life style modification in reducing blood glucose, HbA1c, triglycerides, total cholesterol and VLDL. An important feature in the interpretation of the results of the study, which the authors seemed to have missed, is the participant’s adherence to the yoga programme over the 6-month period of the study. In yoga studies, adherence is usually objectively measured as the number of yoga classes the participant has attended over the given period of the intervention [2, 3]. Nagarathna et al. [1] have reported reasons for the number of drop-outs; however, depiction of the yoga adherence levels of the participants, who completed the study, could have helped better interpret the results of the study. Researchers have opined that Bdecreased adherence to yoga has the potential to decrease the effect of the intervention because subjects who might sustain the greatest benefit will receive a lower dose of the intervention and subjects with higher adherence rates may be functioning closer to maximum ability before the intervention^ [4]. To further research on this important concept of adherence in the field of yoga, we conducted a 4-year long-term follow-up to test the adherence to yoga and its resultant effects on blood glucose. Eighty-nine people with type 2 diabetes enrolled for yoga camps in the year 2010 in a community in Bangalore, but only 26 attended the camps in 2014 (4th year follow-up). The average (SD) age, education, and duration of diabetes of these participants was 52.21 (9.0) years, 14.15 (3.21) years, and 8.24 (6.84) years, respectively. The Integrated Approach to Yoga Therapy (IAYT) for Diabetes developed by Swami Vivekananda Yoga Anusandhana Samasthana (SVYASA) was taught for the first 8 months of the study after which they were advised home practice. Fasting blood sugar (FBS) was assessed at baseline, at the end of 3 months, 8 months and 4 years, and a qualitative interview schedule (to understand reasons for adherence and nonadherence) and Holmes & Rahe Life event scale to measure stressful life events [5] was conducted at the end of 4 years. The results of the study showed that even though daily yoga classes were held for the first 8 months, only 39 participants out of 89 (43.8 %) attended the 8-month classes regularly, which further reduced to just 6 % in 2014. There was no statistically significant reduction in FBS levels over the 4-year period (due to high attrition rates); however, during the time the yoga intervention was provided (first 8 months), the trend showed that FBS levels were lower as compared to the baseline. This could be attributed to the fact that qualitatively, participants experienced a feeling of well-being and positive changes which possibly motivated them to complete the 8-month yoga programme. At the end of 4 years, most participants responded that they did not feel motivated to practice on their own at homes. Further there was a trend in their FBS G. Kumar Yoga and Education, S-VYASA, Bengaluru, India
Materials Today: Proceedings, 2019
During this work, we have been able to eliminate and/or reduce the nickel-type (Ni 2+) heavy meta... more During this work, we have been able to eliminate and/or reduce the nickel-type (Ni 2+) heavy metals contained in the wastewater-model samples by the adsorption technique on natural clay as mineral adsorbent. The present clay was taken from the Ain Dorrij-Ouezzane region of Morocco and characterized by X-Ray Diffraction (RDX) and then applied to the adsorption of the nickel element. The physicochemical parameters such as the pH, the temperature and the concentration of the prepared aqueous samples (nickel adsorption rate (Atomic Adsorption Spectroscopy (AAS)) were optimized as well as for the mass of adsorbent (clay), time and stirring speed. The results obtained during this study have shown that the nickel removal rate is of the order of 70-75% according to the linear forms of the isothermal models (Langmuir and Freundlich) of the adsorption kinetics in a range of time between 30 and 130 min.
Materials Today: Proceedings
Materials Today: Proceedings
During this work, we have been able to optimized the rate of adsorption of heavy metals, the type... more During this work, we have been able to optimized the rate of adsorption of heavy metals, the type of copper, contained the synthesized solutions of waste water loaded with copper, and this, based on the method of adsorption by two types of natural clay taken from the El Oulja-Sale and Had Kourt-Sidi Kacem regions of Morocco. The results of this study show that adsorption of copper by clay from the El Oulja-Sale region was more efficient than that of the Had Kourt region. The difference in the performance obtained from the kinetics of adsorption can revert to the rapidity of adsorption of copper by the clay of the El Oulja-Sale region, while increasing the adsorbent mass, pH, time and the contents of the copper ions. According to the kinetic adsorption study and according to the equations of the adsorption models of Langmuir and Freundlich whose linear forms, it appears that the maximum capacity of adsorption of the copper ions is adequate with the isotherms models of Langmuir and Fr...
In this study, we were able to reduce the content of cobalt ions Co2+ contained in wastewater by ... more In this study, we were able to reduce the content of cobalt ions Co2+ contained in wastewater by the natural clay of El Oulja-Sale region Moroccan as an inorganic adsorbent. The different effects of the experimental parameters on the adsorption kinetics were studied, namely, the different masses of adsorbent, the initial concentrations of cobalt ions, the contact time, the rate of stirring and the pH of prepared solutions. The results of the studied parameters in the removal of cobalt ions have been recorded in the following values: 3 g per mass of adsorbent, 200 mg/l of the concentration of cobalt ions, 400 tr/min of speed agitation, 2 fortunes for the contact time and pH equal to 6. According to the adsorption kinetics study and according to the adsorption equations of Langmuir and Freundlich whose linear forms, it was shown that the maximum amount adsorbed of the studied ions metals have been validated by the linear models of Langmuir and Freundlich isotherms.
During the present review, we have tried to define the different types of water resources, namely... more During the present review, we have tried to define the different types of water resources, namely; Surface waters including waters of dams, lakes, rivers, wades, seas and oceans and groundwater, including groundwater, wells and springs. We also mentioned the different sources of groundwater pollution, including the type of pollution from physical, chemical and biological sources, and accidental, domestic, urban, agricultural and industrial pollution. The pollution of supplementary waters by the discharges of the textile finishing industries and the state of their treatment has been well monitored at the end of this present review.
In the present work, we have conducted a study which is to study the mechanical and hydrodynamic ... more In the present work, we have conducted a study which is to study the mechanical and hydrodynamic performance (permeability and selectivity) of two asymmetric ultrafiltration membranes, the base matrix is polysulfone PSU UDEL P1700 [1-3]. The first type of these membranes is composed only of polysulfone and the second type is made from polysulfone and polystyrene expanded (PSe) [2]. Both membranes were used in the bleaching of waste water loaded with vat dyes (indigo and sulfur black) by using the technical ultrafiltration (UF), while optimizing the hydrodynamic and mechanical conditions of harvested membranes [2, 4]. The results of this study have been shown that the selectivity and the permeability of the PSU/PSe membrane are more efficient with respect to those of the membrane completely comprised of PSU, on the one hand, and the measured values of the fading rate water loaded with the black sulfur dyes and indigo were recorded respectively at percentages 60.78% and 80.36% appropr...
In order to optimize and reduce the rate of inorganic micropollutants rejected by various metal i... more In order to optimize and reduce the rate of inorganic micropollutants rejected by various metal installations, according to wastewater treatment standards and environmental protection, we proceeded by studying the adsorption of heavy metals such as copper by using the Illitic and Kaolinite Clay from Moroccan (IKCM) of El Oulja-Salé region. We are interested in the analysis of the physicochemical parameters influencing the removal of heavy metals (time effect, mass effect absorbent, concentration of initial copper solutions effect, stirring rate effect and the solution's pH). The results of this study was produced by the characterization technique of X-Ray Diffraction (XRD), the Atomic Adsorption Spectroscopy (AAS) and linear forms Langmuir isotherm and Frendlich models which show that the binding and removal copper by this clay is fast with increasing parameters mentioned previously.
Dyes are an important in synthetic organic compounds. Are used in large quantities in the textile... more Dyes are an important in synthetic organic compounds. Are used in large quantities in the textile industries, plastic, cosmetic and tanning, etc. Use of indigoid dyes in textile finishing processes experienced in recent years a strong increase, causing a large volume of wastewater loaded with these dyes. Their release into aquatic systems without any prior treatment causes damage to the environment due to their toxicity, which requires treatment with suitable techniques that respect the environment. However, the complexity of these pollutants and their color greatly affect the effectiveness of treatments applied conventionally. Discoloration tests wastewater of textile industry and some colored solutions were carried out by the ultrafiltration membrane method. During this work, we synthesized a microporous asymmetric membrane alloy polysulfone and polyvinyl chloride. The objective of this work is to show the feasibility of the purification of industrial wastewater charged with indig...
In this work, we conducted a study that is to bleach wastewater model solutions loaded with dyes ... more In this work, we conducted a study that is to bleach wastewater model solutions loaded with dyes of indigo and sulfur black, while using and optimizing the process of hybridized treatment of textile effluents by torque of coagulation-ultrafiltration (CO-UF). According to the separate optimization of coagulation processes (optimum dose of the coagulant (lime) and ultrafiltration membrane (hydrodynamic characterization of the membrane based on polysulfone (PSU)), we combined the two methods in order to increase performance fading exploited colored waters. The results of the rate of discoloration separated by the methods of coagulation and ultrafiltration are respectively of the order of 33.55% and 80.36% for the water loaded with indigo and of the order of 25.33% and 60.78% for those charged with the black sulfur. While the results of the bleaching obtained by the hybrid method CO-UF have shown that the bleaching rate was calculated as around 98% for the indigo and of the order of 92%...
In this work, we have optimized the process of unclogging an asymmetric membrane clogged during u... more In this work, we have optimized the process of unclogging an asymmetric membrane clogged during use in the ultrafiltration of wastewater loaded with vat dyes (indigo and sulfur black) by the method of planes experiments based on the five parameters (time of immersion, temperature, % of hydrochloric acid HCl, % of nitric acid HNO3 and % of sodium hydroxide NaOH). The optimum results obtained for a good method for unclogging are of the order of 90°C for the temperature, 70% for NaOH, 70% for HNO3, 65% for HCl and 3 minutes for the time.
The development of membranes intended for the ultrafiltration of wastewater-models loaded with va... more The development of membranes intended for the ultrafiltration of wastewater-models loaded with vat dyes, the case of indigo, has taken during this work a major interest. This development was based on the synthesis of films, by phase inversion, permselective based on organic polymers such as polysulfone (PSU), polyvinyl chloride (PVC) and expanded polystyrene (PSE) on the one hand and based on octaglycidylether tetraaniline resin for methylenedianiline (OGTAPMDA), bisphenol A (BA) and titanium dioxide TiO2, on the other hand. During the first step, we synthesized five types of membranes named M1, M2, M3, M4 and M5 according to different percentages of the composition of the collodium (polymer/solvent/non-solvent) obtained namely; M1 (12 % PSU/88 % DMF), M2 (9 % PSU/ 1% PVC/ 90% DMF), M3 (13.5 % PSU/0.5 % BA/1 % PSe/85 % DMF), M4 (8.5 % PSU/1.5 % OGTAPMDA/90 % DMF) and M5 (9.5 % PSU/0.5 % TiO2/90 % DMF). The resulting membranes have already been characterized by researchers from the E...
The optimization of experimental parameters by Nemrodw software allowed us to determine the optim... more The optimization of experimental parameters by Nemrodw software allowed us to determine the optimal conditions for a better rate of reduction of suspended solids (SS). The results of theoretical parameters, allowed to give better treatment on the one hand, the process ((Ca(OH)2/ferrocryl®8723) in optimal conditions: a pH of about 9, the type of the coagulant is Al2(SO4)3 and 5g/l dose of ferrocryl®8723, and secondly, by the method of (Al2(SO4)3/ferrocryl®8723).
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Papers by Mohamed Berradi