Nano Chemistry Green Chemistry Environnemental Chemistry environnemental Engineering
The current work concentrated on the green synthesis of silver nanoparticles (AgNPs) through the use of aqueous Citruslimon zest extract, optimizing the different experimental factors required for the formation and stability of AgNPs. The preparation of nanoparticles was confirmed by the observation of the color change of the mixture of silver nitrate, after the addition of the plant extract, from yellow to a reddish-brown colloidal suspension and was established by detecting the surface plasmon resonance band at 535.5 nm, utilizing UV-Visible analysis. The optimum conditions were found to be 1 mM of silver nitrate concentration, a 1:9 ratio extract of the mixture, and a 4 h incubation period. Fourier transform infrared spectroscopy spectrum indicated that the phytochemicals compounds present in Citrus limon zest extract had a fundamental effect on the production of AgNPs as a bio-reducing agent. The morphology, size, and elemental composition of AgNPs were investigated by zeta potential (ZP), dynamic light scattering (DLS), SEM, EDX, X-ray diffraction (XRD), and transmission electron microscopy (TEM) analysis, which showed crystalline spherical silver nanoparticles. In addition, the antimicrobial and antioxidant properties of this bioactive silver nanoparticle were also investigated. The AgNPs showed excellent antibacterial activity against one Gram-negative pathogens bacteria, Escherichia coli, and one Gram-positive bacteria, Staphylococcus aureus, as well as antifungal activity against Candida albicans. The obtained results indicate that the antioxidant activity of this nanoparticle is significant. This bioactive silver nanoparticle can be used in biomedical and pharmacological fields.
This study aims to determine the efficacy of using calcium hydroxide Ca(OH)2 in coagulation process to treat urban liquid effluent from wastewater purification plant.The response surface methodology was used.The effects and interactions between three key process parameters was enhanced applying Box-Behnken design.Factors studied were: coagulant dosage (g/L), coagulation speed (rpm), and coagulation time (min).The treatment efficiency was determined by the turbidity removal rate and the final pH of the treated wastewater.The statistical soundness of the generated model was determined using analysis of variance.The optimal model for determining the relationship between the variables is a second-order quadratic model (R2>98 %).The best turbidity reduction (91.3 %) was obtained using a 0.50 g/L Ca(OH)2 coagulant and 130.1 rpm for 5 minutes.Under these conditions, the ultimate pH of the effluent reached 8.
Abstract In this study, we investigate the removal of Bemacid red dye using brewery waste in a packed bed column. We examined the effects of bed height, inlet flow, and inlet dye concentration on the column dynamics of adsorption. To assess the favorable column dynamics, we analyzed the breakthrough curves (BTCs). We also used the Clark, Thomas, Bed Depth Service Time (BDST), and Adams-Bohart models to determine the kinetic constants of the adsorption column from the obtained results of the dynamic studies curve of the BTCs. Analysis of the BTC studies revealed that both the BTCs time and worn-out time values increased with an increase in bed height and inlet Bemacid red dye dosage but decreased with an increase in the inlet flow rate. The results further showed that Thomas’ model was the most suitable for describing the entire BTCs (R2 > 0.93). Using a full factorial design to estimate the percentage effects of cited dynamic parameters, we found that these parameters accounted for 98% of the adsorption capacity. This methodology for estimation provides crucial information on the effects of parameters and the extent to which the adsorption capacity depends on the studied parameters.
The use of natural, eco-friendly coagulant-flocculants in wastewater treatment can help to reduce suspended particles in a way that includes less exhaustible materials with minimal adverse effects on the environment.Hence, this study is to investigate raw diatomaceous earth (diatomite) as a sustainable ecological coagulant to reduce colloids and suspended matter in wastewater and optimize the coagulation process parameters to improve efficiency, save energy consumption, and reduce costs in the urban sewage treatment plants.The Box-Behnken response surface design was applied to model the individual and combined interactions between four variable factors (initial pH, coagulant dose, coagulation speed, and coagulation time) and their effect on turbidity removal efficiency and final pH of water.Results showed that diatomite has excellent efficiency in reducing the turbidity of wastewater; Elimination reached a maximum of 85.74%.The optimal operating conditions for reducing energy consumption and cost of the operation while improving turbidity removal effectiveness and achieving a neutral final pH to avoid a post-adjustment are an initial pH of 7, a dose of diatomite of 0.5 g/L of effluent, and a coagulation speed of 100 rpm for 3 min.It results in 72.6% turbidity removal and a pH of 7.27.diatomaceous earth shows very usefully for reducing the turbidity of the sewage in the urban wastewater treatment plant.
This paper introduces a numerical methodology for classifying and identifying types of bio-based materials through experimental thermal characterization. In contrast to prevailing approaches that primarily focus on thermal conductivity, our characterization methodology encompasses several thermal parameters. In this paper, the physical characteristics of seven types of bio-based concrete were analyzed, focusing on the thermal properties of palm- and esparto-fiber-reinforced concrete. The proposed method uses artificial intelligence techniques, specifically the k-means clustering approach, to segregate data into homogeneous groups with shared thermal characteristics. This enables the elucidation of insights and recommendations regarding the utilization of bio-based insulation in building applications. The results show that the k-means algorithm is able to efficiently classify the reference concrete (RC) with a performance of up to 71%. Additionally, the technique is more accurate when retaining only six centroids, which, among other things, allows all the characteristics associated with each type of concrete to be grouped and identified. Indeed, whether for k clusters k = 7 or k = 5, the technique was not able to predict the typical characteristics of 2% or 3% esparto concrete (EC).
Environmental pollution, driven largely by industrial emissions, especially from the textile sector, is a pressing concern today [...]
This study aims to evaluate Xantoria parietina (L.), a plant indigenous to north-western Algeria. We analyzed ethanolic (EE), methanolic (ME) and acetonic (EE) extracts obtained from the thalli and apothecia of this plant. Our main focus was on secondary metabolites, specifically polyphenols, flavonoids, condensed and hydrolysable tannins. We additionally assessed their antioxidant characteristics. The Folin-Ciocalteu method was employed to quantify the polyphenol content, while the DPPH (2,2-diphenyl-1-picrylhydrazyl) reduction and FRAP (ferric ion-reducing power) tests were utilized to assess the free radical scavenging activity. The findings show that the methanolic and ethanolic extracts exhibited the highest concentration of polyphenols with 27.839 mg EAG/g (EE) and 27.55 mg EAG/g (ME). The results also indicated significant antioxidant activities in the DPPH compared to ascorbic acid and FRAP assay.In addition, the acetone extract of X. parietina exhibited a significant tannin content of 420.33 mg EC/g of condensed tannins, whereas the ethanolic extract displayed a lower content of 0.187 mg EC/g. This underscores the substantial presence of tannins in the plant. Analyses by high-performance liquid chromatography (HPLC) confirmed the presence of quercetin, gallic acid, chlorogenic acid, catechin narenginin. The findings suggest that X. parietina is a notable source of polyphenols, which are compounds recognized for their antioxidant characteristics.
Due to its efficiency, eco-friendliness, non-toxicity, and cost-effectiveness, the utilisation of plant extracts in the manufacture of silver nanoparticles has garnered attention.The purpose of this study is to determine the feasibility of generating silver nanoparticles from an aqueous extract of Citrus limon leaves and their size and composition was characterized utilizing UV visible, FTIR, SEM, EDX, and Zeta seizer.Additionally, the antioxidant efficacy of Ag NPs was tested using the DPPH radical scavenging method, and their antibacterial activity was verified in vitro using the Agar well diffusion technique.Silver nanoparticles were successfully synthesized and exhibit surface plasmon resonance with an absorption maximum of 475.2 nm and the stabilization of the ions Ag to nanometric spherical negative charge particles, as verified by FTIR, MEB, EDX, and Zeta potential values.Furthermore, the silver nanoparticles created displayed a substantial bactericidal effect against the three types of bacteria (Escherichia coli, Pseudomonas aeruginosa, and Staphylococcus aureus) and an antifungal activity against (Candida albicans) as well as reasonable antioxidant properties.
In Algeria, large numbers of people regularly go to Turkish baths or "Hammams". The cold tap water of the baths in the town of Sidi-Bel-Abbes (Algeria) comes either from wells or from a mixture of potable waterworks water and well water. Its principal use is for personal hygiene (washing). However, the steam heat generates thirst that can cause users to drink cold water during the steam bath. In addition, the wells feeding the baths are often poorly protected and especially badly treated. To ascertain whether their water quality, particularly bacteriological, meets the requirements for drinking water, we studied the characteristics of water from ten Turkish baths in Sidi-Bel-Abbes. Bacteriological analyses of cold water showed signs of contamination of fecal origin in 50% of the samples analysed. Moreover two water points from two of the baths appeared to have permanent fecal contamination. The physicochemical analysis showed that the water was very high in calcium (up to 550 mg/L) and magnesium (up to 299 mg/L). The maximum nitrate level observed was 68 mg/L. This study thus showed the existence of a health risk due to deterioration in the quality of the bath water and demonstrated the need for protection of the wells, frequent purification, and regular microbiological testing.
Hydrocarbons, aldehydes, sulfides, heavy metals, and other contaminants from petroleum treatment processes have been discovered in the oil and gas industry liquid discharge.Hydrocarbons primarily cause the pollution shared by all units.The purpose of this study is to assess the performance of the coagulation-flocculation process in the primary treatment stage for the removal of hydrocarbons and turbidity from the effluent of the Algerian oil refinery RA1/Z.Using 1 g/L of calcium hydroxide coagulant and operating at a stirring speed of 100 rpm for 3 minutes, an excellent elimination of 95.1 % and 90.4 %, respectively, of turbidity and hydrocarbons, was achieved.
Aloe barbadensis Miller, usually referred to Aloe vera, has existed around since the dawn of time.It is a North African plant that has a variety of medicinal properties.This work was a contribution to studying the physico-chemical characteristics, the photochemical content, and the biological properties of Aloe Barbadensis Miller, a plant collected from a local garden located in the small town of Berriane (region of Ghardaïa, Algeria).The antioxidant activity was determined utilizing the DPPH method, and the solid medium diffusion method was employed to assess the antimicrobial potential against human pathogenic bacteria a gram positive (S.aureus) bacterial strain, two gram negative bacteria (E. coli and P. aeruginosa), and one yeast (Candida albicans) and fungi.The phytochemical analysis demonstrated the existence of different phytochemical substances such as phenol, flavonoid, tannin, alkaloid, saponin, and terpenoid in aloe vera gel extract.Furthermore, the antibacterial test of Aloe vera leaf extracts revealed that the gram negative bacteria E. coli sensibility compared with the two other bacteria (S. aureus and P. aeruginosa), which showed resistance, and that this extract showed antifungal efficiency against the fungi.In addition, the aloe vera extract was given an antioxidant effect according to the DPPH free radical method.The findings of this study allowed us to confirm that Aloe vera's biological activity is principally due to the existence of various phytochemical compounds with biological activities, like phenolic compounds.According to these obtained results, A. barbadensis gel extract can be utilized to treat certain diseases by providing a natural biological active component.
Abstract Natural gas is the fastest growing source of fossil energy since the 1970s. Due to its economic and environmental benefits, natural gas is becoming more attractive to many countries every day. The properties of this product, as for example, the low combustion range characterizing it, make it one of the most used reliable sources known to date. Currently, it is the second most used energy source after oil. The GL1/Z plant -Arzew -SONATRACH Company is designed for the liquefaction of natural gas, which is an essential way of transporting gas over long distances. This liquefaction (at -160 ° C) is obtained by successive cooling through compressed refrigerants and then relaxed between two pressure stages. This liquefaction technique consumes a lot of gas considered as internal consumption. In addition to this loss, there is a certain amount of gas that is flared during startup which accounts for about 2/3 of the total amount of flared gas. The reduction of flared gases is important to reduce carbon emissions and rationally use natural gas. In this work we simulate by ASPEN-HYSYS software a three method of gas flare recovery such as power electric generation, LPG (Liquid Petroleum Gas ), and GTL technology (Gas to liquids) to evaluate natural gas resources of GL1/Z plant (SONATRACH Industry –Algeria).
This study involved the preparation of treated Arundo donax L. biomasses by combining specific amounts of raw Arundo donax L. powder with predetermined volumes of phosphoric acid (H3PO4), ammonia (NH4OH), and acetone (C3H6O) individually. These treated Arundo donax L. biomasses were employed for adsorbing Bemacid red dye. Various techniques, including SEM, RX, and FTIR analysis, were employed to characterize the treated Arundo donax L. The impact of contact time, pH, initial dye concentration, and adsorbent amount on the adsorption of Bemacid red dye onto the various treated Arundo donax L. samples was investigated. The optimal conditions for adsorption were identified as a pH value of 2.0, an adsorbent amount of 25 mg, and a contact time of 40 min. Notably, the basic treated Arundo donax L. achieved an impressive dye removal efficiency of 98.91% under these optimal conditions. Additionally, the adsorption process was analyzed using isotherm, kinetic, and thermodynamic models. The Freundlich model provided the most accurate description of the removal of Bemacid red dye by the different treated Arundo donax L. samples. Meanwhile, the Elovich model and the second-order kinetic model offered reliable descriptions at concentrations of 10 and 20–30 mg/L, respectively. In conclusion, the adsorption of Bemacid red dye by treated Arundo donax L. was found to be feasible and occurred spontaneously.
The Red Congo (RC) dye, widely employed across various industrial sectors such as textiles, food, and pharmaceuticals, owes its popularity to its deep red hue [...]
Methylene blue (MB) serves as a widely employed dye within both industrial sectors and laboratory settings [...]
This study investigates the effectiveness of <i>Linum usitatissimum</i> L [...]
The treatment of wastewater generated by industries is challenging due to various xenobiotic and dangerous pollutants, notably multi-category carcinogenic dyes [...]
Orange peels, often deemed as waste, are in fact a natural reservoir of polyphenols, which are phytochemicals with antioxidant properties beneficial to health [...]
I would appreciate any information on studies examining how collaboration enhances the visibility of research, ideas, and academic interact…
