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Enhancing sustainability in phosphate ore processing:Performance of frying oil as alternative flotation collector for carbonate removal

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International Journal of Mining Science and Technology 2024年第4期34卷 557-571页

作者： Asmae El-bahi Yassine Taha Yassine ait-Khouia Abdellatif Elghali Mostafa Benzaazoua Geology&Sustainable Mining Institute(GSMI) Mohammed VI Polytechnic UniversityBen Guerir 43150Morocco

Recycling waste frying oils for the synthesis of flotation reagents presents a promising avenue for sustainable waste ***,it offers a cost-effective solution for crafting a specialized collector designed to efficiently remove carbonates and enhance phosphate enrichment in froth flotation *** study focuses on the synthesis of an anionic collector using the saponification reaction of a frying oil sample,subsequently applied to the flotation of calcite and *** elucidate the adsorption mechanisms of the frying oil collector(FrOC)and sodium oleate,a reference collector,on fluorapatite,calcite,dolomite,and quartz surfaces,comprehensive experiments were conducted,including zeta potential measurements and Fourier transform infrared *** revealed diverse adsorption affinities of the molecules towards these *** assess the practical performance of the collector,flotation tests were conducted using a natural phosphate ore mixture,employing a BoxBehnken experimental ***,under optimized conditions(pH 9,1000 g/t of FrOC,3.5 min of conditioning,and 6 min of flotation),FrOC exhibited excellent performance,with calcite and dolomite recoveries exceeding 80%,while apatite recovery in the concentrate fraction remained below 10%.This work exemplifies both circular economy practices and the distinctive approach to sustainable mineral processing.

关键词： Frying oils recycling Phosphate beneficiation Flotation separation Green surfactants Sustainability

Capparis spinosa L waste activated carbon as an efficient adsorbent for crystal violet toxic dye removal: Modeling, optimization by experimental design, and ecological analysis

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Chinese Journal of Chemical Engineering 2024年第7期71卷 283-302页

作者： Mohammed Benjelloun Youssef Miyah Salma Ssouni Soulaiman Iaich Mohamed El-habacha Salek Lagdali Khadija Saka El Mustafa Iboustaten Abdelaziz ait Addi Sanae Lairini Rabia Bouslamti Laboratory of Materials ProcessesCatalysisand EnvironmentHigher School of TechnologySidi Mohamed Ben Abdellah UniversityFez 30070Morocco Ministry of Health and Social Protection Higher Institute of Nursing Professions and Health TechniquesFez/Meknes 30070Morocco Laboratory of Biochemistry Faculty of MedicinePharmacy and DentistrySidi Mohamed Ben Abdellah UniversityFez 30070Morocco Laboratory of Applied Chemistry and Environment Faculty of SciencesIbnou Zohr UniversityAgadir 80322Morocco Research Team of Energy and Sustainable Development Higher School of TechnologyIbnou Zohr UniversityGuelmim 81000Morocco Organic Chemistry and Physical Chemistry Laboratory Faculty of SciencesIbnou Zohr UniversityAgadir 80322Morocco

Textile dyes are dramatic sources of pollution and non-aesthetic disturbance of aquatic life and therefore represent a potential risk of bioaccumulation that can affect living *** is imperative to reduce or eliminate these dyes from liquid effluents with innovative biomaterials and ***,this research aims to highlight the performance of Capparis spinosa L waste-activated carbon(CSLW-AC)adsorbent to remove crystal violet(CV)from an aqueous *** mechanism of CV adsorption on CSLW-AC was evaluated based on the coupling of experimental data and different characterization *** efficiency of the CSLW-AC material reflected by the equilibrium adsorption capacity of CV could reach more than 195.671 mg·g^(–1) when 0.5 g·L^(–1) of CSLW-AC(Particle size≤250μm)is introduced into the CV of initial concentration of 100 mg·L^(–1) at pH 6 and temperature 65℃ and in the presence of potassium ions after 60 min of contact time according to the one parameter at a time *** adsorption behavior of CV on CSLW-AC was found to be consistent with the pseudo-second-order kinetic model and Frumkin's linear isothermal *** thermodynamic aspects indicate that the process is physical,spontaneous,and *** optimization of the process by the Box Behnken design of experiments resulted in an adsorption capacity approaching 183.544 mg·g^(–1)([CV]=100 mg·L^(–1) and[CSLW-AC]=0.5 g·L^(–1) at 35 min).The results of the Lactuca sativa seeds germination in treated CV(70%),adsorbent solvent and thermal regeneration(more than 5 cycles),and process cost analysis(1.0484 USD·L^(–1))tests are encouraging and promising for future exploitations of the CSLW-AC material in different industrial fields.

关键词： Box Behnken Capparis spinosa L waste-activated carbon Cost analysis Isotherm Kinetic Regeneration

An Affordable and Easily Accessible Approach for Acrylonitrile Monomer Purification through a Simple Column Technique

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Journal of Materials Science and Chemical Engineering 2024年第4期12卷 18-28页

作者： Rawdah Whba Mohd Sukor Su’ait Azizan Ahmad Department of Chemistry Faculty of Applied Sciences Taiz University Taiz Yemen Department of Engineering Physics Istanbul Medeniyet University Istanbul Türkiye Solar Energy Research Institute (SERI) Universiti Kebangsaan Malaysia Bangi Malaysia Department of Chemical Sciences Universiti Kebangsaan Malaysia Bangi Malaysia Department of Physics Faculty of Science and Technology Airlangga University (Campus C) Surabaya Indonesia

This manuscript presents a dataset detailing a method for purifying monomers. Purification plays a crucial role in every chemical process, as it leads to an improvement in product quality through the removal of impurities. The primary method for monomer purification, like acrylonitrile (AN), is the distillation technique. However, this technique is unsafe and hard to set up or handle. A straightforward, risk-free, low-cost method like the column technique resolves these issues. A simple column technique demonstrated the successful execution of purifying AN. Fourier transform infrared (FTIR) and nuclear magnetic resonance (NMR) analyses confirmed that AN was successfully purified, with purity reaching 99.8%. FTIR spectra revealed changes in the position and intensity of the stretching vibration peaks after purification. Also, the functional groups of the inhibitor monomethyl ether of hydroquinone (MeHQ) were undetected after purification. Furthermore, after purification, NMR spectra revealed the absence of aromatic protons and carbons associated with MeHQ. In conclusion, the column technique is a successful and inexpensive way to purify AN monomers. This makes it useful for a wide range of applications, especially in polymerization reactions where MeHQ needs to be removed to prevent self-polymerization during the initiation process.

关键词： Liquid Monomers Acrylonitrile Purification Inhibitor Simple Column

Adsorption of Disperse Blue SBL dye by synthesized poorly crystalline hydroxyapatite

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Journal of Environmental Sciences 2008年第10期20卷 1268-1272页

作者： BARKA Noureddine QOURZAL Samir ASSABBANE Ali NOUNAH Abederrahman ait-ichou yhya Materials Photocatalysis and Environment Team Department of Chemistry Faculty of Sciences Agadir.BP: 8106 Hay Dakhla Agadir 80006 Morocco. Laboratory of Environmental Sciences Technology High School.BP.227 Sal-Mdina 11000 Morocco

The present study has been undertaken to evaluate the adsorption in batch mode of a disperse dye (Disperse Blue SBL) by poorly crystalline hydroxyapatite synthesized by coprecipitation between Ca(NO3)2and (NH4)2HPO4 reagents in aqueous solution at room temperature. The adsorption experiments were carried out to investigate the factors that influence the dye uptake by the adsorbent, such as the contact time under agitation, adsorbent dosage, initial dye concentration, solution temperature, and pH. The experimental results show that the percentage of dye removal increases with increasing the amount of adsorbent, until the total discoloration. The adsorption isotherms follow the model of Langmuir with a high adsorption capacity. The adsorption was pH and temperature dependent.

关键词： hydroxyapatite Disperse Blue SBL adsorption isotherm enthalpy of adsorption

Juvenile Systemic Sclerosis: About 9 Cases

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Open Journal of Pediatrics 2024年第2期14卷 320-326页

作者： Kaoutar Danaoui Houda Nassih Khadija Oujennane Rabiy El Qadiry Aicha Bourrahouat Said Amal Imane ait Sab B Pediatric Ward Mohammed VI University Hospital Center Marrakesh Morocco Dermatology Ward Mohammed VI University Hospital Center Marrakesh Morocco

Scleroderma is a rare disease with two primary forms: localized scleroderma (LS) and systemic sclerosis (SSc). Both are chronic conditions that can manifest in various patterns (subtypes) and are linked to extracutaneous involvement in pediatric patients. Juvenile SSc poses a higher risk of morbidity and mortality, with patients facing life-threatening complications such as lung, heart, and visceral organ fibrosis, and vasculopathy. In contrast, mortality is extremely rare in juvenile LS, but patients are susceptible to significant morbidity, leading to severe disfigurement and functional impairment. Treatment for scleroderma aims to control inflammation and address specific issues. An early diagnosis significantly enhances the overall outcome. This study conducts a retrospective descriptive analysis aiming to document the clinical manifestations, management approaches, and outcomes of systemic sclerosis in a cohort of nine children receiving treatment for juvenile systemic sclerosis at Pediatric B department of Mohammed VI University, Hospital Center in Marrakech, Morocco.

关键词： Scleroderma Systemic Sclerosis Children Pediatric

Novel insights into the impact of liver inflammatory responses on primary liver cancer development

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Liver Research 2023年第1期7卷 26-34页

作者： Yeni ait-Ahmed Fouad Lafdil Universite Paris-Est UMR-S955UPECCreteilFrance Institut National de la Sante et de la Recherche Medicale(INSERM) U955CreteilFrance Institut Universitaire de France(IUF) ParisFrance

Primary liver cancers rank among the deadliest cancers worldwide and often develop in patients with chronic liver diseases in an inflammatory *** review highlights recent reports on the mechanisms of inflammatory-mediated hepatic cell transformation that trigger the tumorigenic process(initiation steps)and the impact of the immune response favoring tumor cell expansion(progression steps).Several cytokines,namely interleukin(IL)-6,IL-17,IL-1beta,and tumor necrosis factor-alpha,have been described to play a prominent role in the initiation of liver ***,inflammation contributes to cancer progression by favoring tumor escape from anti-tumor immune response,angiogenesis,and metastasis through tumor growth factor-beta and matrix metalloprotease *** recent studies allowed the development of novel therapeutic strategies aiming at regulating liver *** strategies are based on the use of anti-inflammatory agents,antibodies targeting immune checkpoint molecules such as programmed death ligand 1 and molecules targeting angiogenic factors,metastasis key factors,and microRNAs involved in tumor *** review aims at summarizing the recent studies reporting different mechanisms by which the liver inflammatory responses could contribute to liver cancer development.

关键词： Liver inflammation Primary liver cancers Cytokines Immunotherapy MicroRNA(miRNA,miR)

On the gradient tracking problem for a bilinear reaction–diffusion equation excited by distributed bounded controls

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Journal of Control and Decision 2023年第3期10卷 365-373页

作者： El Hassan Zerrik Abderrahman ait Aadi Mohamed Ouhafsaa MACS Laboratory Faculty of SciencesMoulay Ismail UniversityMeknesMorocco Department of Sciences Ecole Normale SupérieureMoulay Ismail UniversityMeknesMorocco

This paper addresses a gradient tracking problem of a bilinear reaction–diffusion equation evolvingin a spatial domainΩ ⊂ Rn, n ≤ 3. Such an equation is excited with distributed and boundedcontrols. The problem is formulated by the minimisation of a functional constituted of the deviationbetween the desired gradient and the current one all over a time interval and the energyterm. Then we prove the existence of an optimal control that we characterise by an optimalitysystem. Moreover, we discuss two sets of particular controls: the set of time dependent controlsand the space dependent ones. A computational approach and illustrative simulations are alsogiven.

关键词： Infinite dimensional systems bilinear systems reaction–diffusion equation controllability optimal control

Odour Impact Assessment by Means of Dispersion Modeling, Dynamic Olfactometry and Mobile Electronic Nose around Agadir Fishing Port in Morocco

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Journal of Environmental Protection 2016年第12期7卷 1745-1764页

作者： Ahmed Chirmata Ihya ait ichou AQUAMAR Laboratory Photocatalysis and Environment Team Department of Chemistry Faculty of Sciences Ibn Zohr University Agadir Morocco

Odorous emissions emitted from various sources including industrial and commercial activities have particular concerns about human health. These malodors emissions are an environmental concern that affects health status and social life of the neighbors. That requires the local authority to set up a management strategy to control this nuisance. The evaluation of odour emissions from fishing port is complex because these emissions depend on several factors such as multiple sources of odor emissions, meteorological conditions, topography and others. That imposes the use of complementary approaches to monitor odours. In this paper, the case of Agadir fishing port is studied, which is adjacent to the tourist area and residential neighborhoods and which hosts a number of points that can generate odors. To assess this odour impact, three methods are used such as dynamic olfactometry, dispersion modeling and mobile electronic nose (e-nose). The use of these three methods in a complementary manner to assess odour impacts around a fishing port allowed both the quantification of the emissions using dynamic olfactometry and the evaluation of their impact on the study area with model dispersion. The results enabled also to identify the most affected areas of the city by odor emissions and to recognize the meteorological parameters maximizing odor impact. The other goal of this work is to compare the results of the odour dispersion modeling and e-nose measurements for one year in terms of frequency of overtaking the set alert thresholds over the same period. Comparison highlights the strengths and weaknesses of both approaches. Modeling can be used predicatively but it does not take into account fugitive emissions reliably in the absence of data on these emissions, modeling based on the hourly average misjudges the odor peaks, while e-nose made it possible to obtain validated data and provides accurate, affordable and real-time odour measurement capability tacking in to account t

关键词： Electronic Nose Odor Dispersion Modeling Dynamic Olfactometry Odor Impact Assessment AERMOD

Coupled Conductive-Convective-Radiative Heat Transfer in Hollow Blocks with Two Air Cells in the Vertical Direction Subjected to an Incident Solar Flux

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Fluid Dynamics & Materials Processing 2022年第5期18卷 1399-1407页

作者： Mourad Najjaoui Thami ait-taleb Abdelhalim Abdelbaki Zaki Zrikem Hassan Chaib Polydiscilinary Faculty of Ouarzazate Ibn Zohr UniversityOuarzazateMorocco Faculty of Sciences Semlalia Cadi Ayyad UniversityMarrakeshMorocco

This work presents the results of a set of steady-state numerical simulations about heat transfer in hollow blocks in the presence of coupled natural convection,conduction and *** with two air cells deep in the vertical direction and three identical cavities in the horizontal direction are considered(typically used for building ceilings).Moreover,their outside horizontal surface is subjected to an incident solar flux and outdoor environment temperature while the inside surface is exposed to typical indoor environment *** flows are considered laminar and two-dimensional over the whole range of parameters *** conservation equations are solved by means of a finite difference method based on the control volumes approach,relying on the SIMPLE algorithm for what concerns the coupling of pressure and *** effects of the number of cells in the horizontal direction and the thermal conductivity on the heat transfer through the alveolar structure have been *** results show that the number of holes has a significant impact on the value of the overall heat flux through the considered structure.

关键词： Numerical simulation heat transfer coupled hollow concrete block control volumes approach