Reaction Time Conditions Research Articles

Treatment of Landfill Leachate by Heterogeneous Catalytic Ozonation with Granular Faujasite Zeolite

Ozonation, combined with suitable catalyst represents an interesting option in removing poorly degraded pollutants from stabilized landfill leachate. Therefore, this study aimed to eliminate chemical oxygen demand (COD), color, and ammoniacal nitrogen, and to improve the biodegradability of stabilized landfill leachate using the heterogeneous catalytic ozonation with natural zeolite (Faujasite) in comparison with solo ozone or adsorption treatment. First, Faujasite was characterized and used in batch studies to find the optimum removal, followed by isotherm and kinetic studies to understand the mechanism. Next, ozonation as sole treatment under different operating conditions of pH and reaction time was applied. Subsequently, Faujasite was combined in the same reactor with the ozone in heterogeneous catalytic ozonation to enhance the treatment performance. Removal for ammonia, COD, and color by ozone as sole treatment were 29%, 47%, and 90%, respectively, compared with 63%, 66%, and 60% reductions by Faujasite as adsorbent. Heterogeneous catalytic ozonation with Faujasite shows ∼64% and 93% of the COD and color removal at pH 11. At this pH, Faujasite promoted ozone degradation, whereas 35% of ammonia was removed at pH 5 because of the interaction between direct ozone and pollutants on the Faujasite surface. Leachate biodegradability also improved from 0.016 to 0.1 after the combined treatment. Faujasite augmented in the ozonation improved the removal of pollutants and simultaneously enhanced the biodegradability of the stabilized landfill leachate.

Phosphine oxide-directed palladium-catalyzed B(3)–H arylation of o-carboranes

The selective functionalization of carboranes has received increasing research interests due to their wild applications in chemistry, life, and material sciences. Among various structurally diverse carboranes, the development of selective functionalization of the commercially available o-carborane (1,2-C2B10H12) has largely focused on the two acidic CH bonds. By contrast, research on the activation of the other ten hydridic cage B–H vertices is relatively less explored. Of particularly challenging, the most electron-deficient nature of B(3,6)-H bonds render very few synthetic methods available for their functionalization. Herein, we develop a phosphine oxide-directed palladium-catalyzed highly B(3)–H selective arylation of o-carboranes under very mild reaction conditions in short reaction time.

Optimizing of Enzyme Hydrolysis Condition for Bitterness Suppression of Soybean Protein Using Response Surface Methodology (RSM)

Enzyme hydrolysis of soybean protein can be adjusted according to purposes, but should be optimized for reaction time, concentration and substrate conditions to prevent bitterness caused by excessive hydrolysis. This study was carried out to find the optimal condition of the soybean protein hydrolysis process using a response surface methodology. The experiment was designed based on a central composite design, and the independent variables were the soybean protein extraction pH (X1, 10-12), enzyme concentration (X2, 0.1-0.5%) and hydrolysis time (X3, 150-210 minutes). The results of the degree of hydrolysis (Y1), pH (Y2) and soluble solid contents (Y3) were fitted to a response surface methodology model (R2= 0.91, 0.98, and 0.86, respectively). The optimal hydrolysis condition for soybean protein hydrolysis was as follows; pH 12, enzyme concentration 0.27% and 187.88 min, respectively. While richness and sourness were increased with soybean protein hydrolysis, the saltiness was decreased. The bitterness of the hydrolysate prepared at the optimal condition did not show any difference compared with that of the soybean protein, whereas richness and sourness showed a significant increase. The enzyme hydrolysate at the optimal condition showed distribution of a molecular weight lower than the soybean protein did to form intense bands at 35, and 25 kDa. Therefore, this hydrolysate was expected to be used as a high-value plant protein food material.

Assessment of Experimental Factors Affecting the Sensitivity and Selectivity of the Spectrophotometric Estimation of Proanthocyanidins in Foods and Nutraceuticals

The assessment of a reliable method for the determination of active proanthocyanidins (PACs) in functional foods, nutraceuticals, and foodstuffs is still a pending analytical challenge. In general, pharmaceutical and food companies accept the assay based on 4-dimethylaminocinnamaldehyde (DMAC) as an overall index of PACs, although these values provided confuse information of the actual bioactivity of the product. Besides, obtaining accurate and precise results is difficult because of the complexity of the sample matrices and the differential selectivity of analytes. Here, we have investigated in detail those experimental factors contributing to the PAC-DMAC derivatives, and we have explored the possibilities for increasing the selectivity of the reaction to detect the fraction of PAC molecules with antibacterial properties. In this regard, the use of harsh conditions, especially working at high temperature, contributes to the formation of the desired derivatives and the degradation of the undesired ones. Unfortunately, the selective detection of A-type species based on DMAC derivatization was not realistic. Another goal of the study was the development of a spectrophotometric assay for the determination of the total content of flavanols. In this case, experimental conditions were chosen to reach high responses for all the compounds. Working under mild conditions of temperature and reaction time (20 °C and 20 min), the method was suitable to estimate the overall flavanol content of food supplements, nutraceuticals, and commercial fruit juices.

One-pot synthesis of bimetal MOFs as highly efficient catalysts for selective oxidation of styrene

A series of novel bimetallic organic framework materials (Cux-Coy-MOF) have been successfully prepared by a simple one-pot synthetic method, and their characters were evaluated via means of various techniques. The tested data showed a series of Cux-Coy-MOFs displayed good crystallinity and the doping of Co in original Cu-based framework would not change the morphology of the MOF catalysts. The catalytic activity of prepared materials was tested in the catalytic oxidation of styrene in the presence of TBHP. The effects of reaction time, reaction temperature and other reaction conditions on catalytic performance were systematically studied. The results revealed that the introduction of Co can improve the selectivity to form epoxides and reduce the yield of benzaldehyde without affecting the conversion rate of catalytic oxidation reaction of styrene. Excitingly, the Cu0.25-Co0.75-MOF showed better catalytic performance than Cu-MOF and Co-MOF under the optimal reaction conditions, the conversion rate of styrene reached 97.81%, and styrene oxide selectivity reached 83.04%, which indicated a significant synergistic effect of the Cu/Co bimetallic MOF. Furthermore, the Cu0.25-Co0.75-MOF catalyst exhibited good reusability that could be reused at least four times without significant inactivation. A series of novel bimetallic organic framework materials (Cux-Coy-MOF) have been successfully prepared via a simple one-pot synthetic method, and they exhibited high activity and selectivity as catalyst towards for oxidation of styrene.

Synthesis of glycolurils and hydantoins by reaction of urea and 1, 2‐dicarbonyl compounds using etidronic acid as a “green catalyst”

AbstractMost of the known methods for the synthesis of heterocyclic compounds have disadvantages, such as a long reaction time and aggressive conditions. We have developed a new, rather simple and efficient method for the synthesis of a number of glycoluryls and hydantoins in water using a etidronic acid (HEDP) as “Green catalyst.” So, for the first time, the condensation reaction of ureas with 1, 2‐dicarbonyl compounds was carried out in the presence of HEDP. Also based on NMR studies, a chemism of these reactions, which is stepwise, is proposed. It has been established that the optimal conditions for the synthesis of glycoluryls and hydantoins using HEDP are: temperature 80°C‐90°C, 40‐20 minutes, and the ratio of urea and HEDP is 1:1. In all cases, the remaining aqueous filtrate containing HEDP after the reaction can be reused for other cycles synthesis of glycoluril and other compounds, because HEDP is not converted during the reaction.

Determination of 1,1-dimethylhydrazine (UDMH) in water by HPLC-UV using micellar catalysis for preparation of the derivatives

The possibility of improving the HPLC-UV determination of 1, 1-dimethylhydrazine (unsymmetrical dimethylhydrazine, UDMH) with preliminary derivatization with 2-nitrobenzaldehyde (2NBA) and 4-nitrobenzaldehyde (4NBA) in an aqueous medium when using micellar catalysis of the reaction to obtain the derivatives is studied. Conditions of UDMH derivatization (pH, concentrations of the reagent and surfactant (SAS), temperature and reaction time) were optimized. It is shown that complete derivatization occurs at room temperature during 45 and 30 min (for 2NBA and 4NBA, respectively) at pH 9 in the presence of 87 mM sodium dodecyl sulfate (SDS) and the excess content of the reagents. Ion chromatography was used to prove the quantitative yields under conditions of derivatization by the absence of UDMH in the reaction mixture. Micellar catalysis provides the completeness of derivatization carried out under milder conditions and in the region of low UDMH concentrations thus expanding the linear range of UDMH determination in water. ZORBAX Eclipse Plus C18 column (150 × 3.0 mm, 3.5 μ m) was used for separation of the components. A mixture of acetonitrile and 10 mM ammonia buffer solution pH 7 (50/50 vol.%) at a flow rate of 0.7 ml/min in isocratic mode was used as a mobile phase. Detection of dimethylhydrazines (2NBA and 4NBA) was performed at 308 and 394 nm, respectively. The obtained detection limits of UDMH ( S / N = 3) were 3 and 1.5 μ g/L for 2NBA and 4NBA, respectively. Duration of chromatographic analysis was 15 min. The developed technique of water analysis provides simple, sensitive and reproducible HPLC-UV determination of UDMH in a concentration range of 5 – 1000 μ g/L without additional preconcentration.

A simple and efficient synthesis of substituted 2H-1-benzopyran-2-ones using natural acids and their bio evaluation

A simple and efficient route for the synthesis of coumarin derivatives (3a-3g) from reaction between substituted phenols (1a-1g) and methyl acetoacetate (2b) in presence of Citrus limon L. juice, Vitis vinifera L. juice and banana peels extract has been carried out. The homogeneity of the compounds were routinely checked by thin layer chromatography and melting points reported are uncorrected. The compounds (3a-3g) were characterized by using 1HNMR and FTIR spectral techniques and evaluated for in vitro herbicidal activity against Raphanus sativus L. (Radish seeds). The compounds (3a-3g) were also screened for their fungicidal activity against Rhizoctonia solani and Colletotrichum gloeosporioides by poisoned food techniques. Antibacterial activity was also determined against Erwinia cartovora and Xanthomonas citri by inhibition zone method. From activity data, it was found that compounds 3a and 3b were most active against Raphanus sativus L. (root) and Raphanus sativus L. (shoot) respectively. Compound 3b was found most active against R. solani fungus and Xanthomonas citri bacterium at highest concentration. Compound 3e has shown maximum percentage inhibition i.e. 83.17 against C. gloeosporioides at 2000 µg/mL concentration. Erwinia cartovora bacterium was most susceptible to compound 3 g giving 8.00 mm inhibition zone at 2000 µg/mL concentration. Less reaction time, excellent yields, simple work-up, cost effective and mild reaction conditions are some merits of present protocol.

Cobalt oxide NPs immobilized on environmentally benign biological macromolecule-derived N-doped mesoporous carbon as an efficient catalyst for hydrogenation of nitroarenes

Highly nitrogen-doped mesoporous carbon (N-mC) material incorporated cobalt oxide nanoparticles was synthesized through simple pyrolysis of environmentally friendly chitosan-polyaniline-Co(OAc)2 precursor in one-step. The as-prepared catalyst named CoO@N-mC with 14.65 ​wt% nitrogen content was characterized by different analysis techniques. The heterogeneous catalyst exhibits outstanding catalytic activity for the reduction of a variety of nitroaromatic compounds in the presence of NaBH4 as a reducing agent in water as a green solvent at 75 ​°C. Utilization of natural biological macromolecules such as chitosan as green and cheap starting material with harmless aniline and earth-abundant cobalt salt, facile synthesis, excellent product yield, short reaction time, high chemoselectivity, sustainable and mild reaction condition, and reusability of catalyst for at least five cycles without any significant decline in the catalytic efficiency are some prominent merits of this new nanocatalyst.

Modeling and Optimization of Photocatalytic Degradation of Methylene Blue Using Lanthanum Vanadate

Methylene blue (MB) is one of the commonly used dyes in the textile industry and can be used as a model pollutant for the textile industry wastewater. In this work, the photocatalytic degradation of MB by synthesized nanoparticles of lanthanum vanadate (LaVO4) was assessed. The effects of pH, initial MB concentration and catalyst dose on the removal performance of MB were investigated and measuring the optimum values of these operational conditions was performed using response surface methodology (RSM). Catalyst dose of 0.43 g/L, initial MB concentration of 5.0 mg/L, and pH of 6.86 were found to be the optimum conditions in reaction time of 60 min. A mathematical model was formed to relate the removal efficiency of MB to the aforementioned operating parameters. The removal efficiency of MB was 91% without any scavengers at a catalyst dose of 0.3 g/L, pH of 7 and initial MB concentration of 10 mg/L. The trapping experiments confirmed the participation of different reactive species in the photo-degradation process. The degradation rates of MB were 91%, 86%, 81%, 77.70% and 72% in five successive runs using LaVO4.

Optimization of Biodiesel Production from Neem Oil using KOH Supported with Activated Carbon

Fossil fuel reduction and environmental degradations are the two crises that the world threatened by generally and UAE specifically. Biodiesel is a fuel produced through a chemical reaction of animal fat or vegetable oil with alcohol, and consider a potential alternative of diesel engines. However, this reaction needs a catalyst to complete successfully. The current article contains transesterification of neem oil with KOH catalyst supported with activated carbon (KOH/AC). This study included experimental work by applying KOH/AC as an effective catalyst for transesterification of local neem oil. The response surface methodology (RSM) software tool was used in this study to determine the optimal conditions of reaction time, amount of catalyst and ratio of methanol to oil in order to obtain the highest percentage of biodiesel product. The optimal settings obtained were 60 min reaction time, a ratio of oil to methanol 1:6 and 1 wt% of catalyst, which lead to the highest yield of biodiesel (100 wt%). The specific features of biodiesel were checked and compared to ASTM standards.

Metal‐Free Oxidative [5+1] Cyclization of 1,5‐Enynes for the Synthesis of Pyrazine 1‐Oxide

AbstractA chemo‐selective nitrosylation of 1,5‐enynes via a sequence of NO radical incorporation and intramolecular radical cyclization was reported. The formation of two C−N bonds and one C−O bond make this [5+1] cycloaddition reaction an efficient approach to synthesize pyrazine 1‐oxides in moderate to good yields. Metal‐free, short reaction time and mild conditions render this strategy more practical, eco‐friendly and convenient. Synthetic utility of this protocol is highlighted by scaffolds diversification.magnified image

Size-Controlled Synthesis of Iron and Iron Oxide Nanoparticles by the Rapid Inductive Heating Method.

Inductive heating synthesis is an emerging technique with the potential to displace the hot-injection synthesis method to prepare colloidal particles very rapidly with a narrow size distribution, controlled size, and high crystallinity. In this work, the inductive heating synthesis is applied to produce a short-temperature jump to mimic conditions like the hot-injection method to prepare traditional iron and iron oxide nanoparticles (IONPs) in the 3–11 nm size range within various solvents, precursors, and reaction time conditions. Moreover, this inductive heating technique can be used under unique experimental conditions not available for hot-injection reactions. These conditions include the use of very high initial monomer concentrations. Considering benefits over conventional methods, the inductive heating technique has the potential to provide an industrial level scale-up synthesis. The magnetization of these particles is consistent with the magnetization of the particles from the literature.

NiFe2O4@SiO2 @amino Glucose Magnetic Nanoparticle under Solvent-free Condition: A New, mild, Simple and Effective Avenue for the Synthesis of Quinazolinone, Imidazo[1,2-a]Pyrimidinone and Novel Derivatives of Amides.

Imidazo[1,2-a]pyrimidinone, quinazolinone and amide derivatives have attracted a lot of interest because of their broad scope of biological and pharmacological activities. There are a lot of methods reported in the literature for their synthesis. Therefore, we became interested in developing a convenient synthetic method for the preparation of imidazoquinazolinone and amide derivatives. NiFe2O4@SiO2 @glucose amine were synthesized, characterized and have been used for the green, effective and mild multicomponent synthesis of quinazolinones, benzoimidazo[1,2-a]pyrimidinones and amides under solvent-free conditions in short reaction times and excellent yields. To expand of the scope of this avenue, multicomponent synthesis of mono and bis novel amides was tested for the first time. All of the products were characterized by mp, FT-IR, NMR and elemental analysis. Aldehyde (1mmol), 2-amino benzimidazole (1 mmol), dimedone (1mmol) or indane-1,3-dione (1 mmol) for the synthesis of quinazoline or imidazopyrimidinones and arene (1mmol), anhydride (1mmol), 2- aminobenzimidazole (1mmol) for the synthesis of amides in the nanocatalyst NiFe2O4@SiO2@glucose amine (0.15mol%: 0.05g) were stirred by a magnet for the required reaction time. After completion of the reaction, as indicated by TLC, the products were collected and recrystallized from ethanol if necessary. We present a novel avenue for the synthesis of benzimidazo[1,2-a] pyrimidinones, quinazolinones and amides in the presence of NiFe2O4@SiO2@glucose amine under solvent-free conditions. In conclusion, we developed NiFe2O4@SiO2 @glucose amine-catalysed multicomponent synthesis of quinazolinones and imidazo[1,2-a]pyrimidinones using the reaction of benzaldehyde, dimedone or indane-dione and 2-aminobenzimidazole and multicomponent synthesis of amides using arenes, cyclic anhydrides and 2-aminobenzimidazole by a solvent-free technique. This method proves to be a robust and innovative approach for the synthesis of a biologically important structure. The operational simplicity, the excellent yields of products, ease of separation and recyclability of the magnetic catalyst, waste reduction and high selectivity are the main advantages of this method. Furthermore, this new avenue is cheap and environmentally benign.

MWCNTs‐ZrO2 as a reusable heterogeneous catalyst for the synthesis of N‐heterocyclic scaffolds under green reaction medium

A simple, efficient, and facile heterogeneous multi‐walled carbon nanotubes‐zirconia nanocomposite (MWCNTs‐ZrO2) has been synthesized using natural feedstock coconut juice (água‐de‐coco do Ceará). The synthesized catalyst was characterized by Fourier transform infrared spectroscopy, X‐ray diffraction, field emission scanning electron microscopy, and X‐ray photoelectron spectroscopy analysis. The heterogeneous nanocomposite has been used for one‐pot synthesis of various N‐heterocyclic compounds like pyrazoles, 1,2‐disubstituted benzimidazoles, 2‐arylbenzazoles, and 2,3‐dihydroquinazolin‐4(1H)‐ones under green reaction medium at room temperature. This novel method has several advantages, such as short reaction time, simple work‐up, excellent yield, and green reaction conditions. The catalyst was recycled up to four times without significant loss in catalytic activity.

Electrochemical degradation of methylene blue dye using a graphite doped PbO2 anode: Optimization of operational parameters, degradation pathway and improving the biodegradability of textile wastewater

An anodic oxidation process with graphite anode coated with lead dioxide (G/β-PbO2) was optimized for the degradation of methylene blue (MB) and the treatment of real textile wastewater. The G/β-PbO2 anode was prepared by the electrochemical precipitation method. The scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and X-ray diffraction (XRD) analyses confirmed the successful coating of graphite substrate with the β-PbO2 film. The effect of four independent variables including pH, reaction time, current density, and electrolyte concentration of Na2SO4 on the performance of the electrochemical oxidation system was modeled by using a complete central composite design and was then optimized by genetic algorithm method. The accuracy of the proposed quadratic model by CCD was confirmed with p-value <0.0001 and adj-R2 > 0.9. The optimum conditions for solution pH, reaction time, current density, and Na2SO4 electrolyte concentration were obtained to be 5.75, 50 min, 10 mA/cm2, and 78.8 mg/L, respectively. In these conditions, the experimental removal efficiencies of MB using G/β-PbO2 and graphite anodes were 96.2% and 68.3%, respectively. The electrochemical removal of MB using both G/β-PbO2 and graphite anodes wellfollowedthepseudo-first-order reaction (R2 > 0.9). Cyclohexane, cyclohexa-2,5-dien-1-ylium, and N-(sec-butyl) aniline were the most abundant intermediates identified by LC-MS analysis. However, the complete mineralization of MB was achieved in 60 min. The optimized anodic oxidation process successfully improved the biodegradability of real textile wastewater (BOD/COD>0.4).

A novel temperature-sensitive cationic hydrophobic cellulose ether: preparation and characterization

A temperature-sensitive polymer—hydroxyl isopropoxy triethyl ammonium chloride cellulose ether—was prepared from hydroxypropyl methyl cellulose (HPMC) and with epoxypropyl triethyl ammonium chloride as the hydrophobization reagent. Then, the reaction conditions of etherification reaction time, mass ratio of the etherifying agent to HPMC, molar ratio of alkali to etherifying agent, and concentration of HPMC were optimized. The structures of the products were characterized via nuclear magnetic resonance and infrared spectrum, and the temperature sensitivity was analyzed via ultraviolet spectrophotometry. It was found that the degree of substitution significantly affected the temperature sensitivity and lowest inversion temperature of the hydroxyl isopropoxy triethyl ammonium chloride cellulose ether. The effects of the substitution degree rising from 0.19 to 0.50 on the water retention value were explored. When the molar ratio of alkali to HPMC was constant, the water retention value declined with the increased substitution degree of cationic cellulose ether. The temperature rise of phase transformation in this process was fully reversible and nonhysteretic. Since the polymer variation originated from the change of intramolecular and intermolecular forces during the heating process, here the effects of addictive micromolecules on the regulator solution were further studied. As the NaOH concentration rose, the substitution degree and water retention value both first increased and then declined and both maximized at the NaOH concentration of 20.7%.

The investigation of hydrophilic modification of membrane surface based on the mono-esterification between maleic anhydride and polyethylene glycol: Response surface methodology, reaction kinetics and performance analysis

In this work, the hydrophilic modified membrane of polyvinylidene fluoride (PVDF) matrix with better anti-fouling capacity was prepared via thermally induced phase separation (TIPS) method and the surface grafting of polyethylene glycol 2000 (PEG2000). Response surface methodology (RSM) was used to optimally design the best reaction conditions based on the objective of the grafting degree (GD). The results revealed that the most significant term to influence GD is reaction temperature. The rounded optimum conditions of reaction time, catalyst dosage and reaction temperature were 4 h, 0.6% and 73 °C, respectively. The investigation of kinetics indicated that the mono-esterification between styrene-co-maleic anhydride (SMA) and PEG2000 conforms to the second reaction kinetics and the activation energy (Ea) is 47.125 KJ/mol. This implied the feasibility for this solid–liquid (S-L) phase reaction, which can be attributed to the higher reactivity of MA functional group and the effectiveness of base-catalysis. Finally, the reason to improve anti-fouling capacity for the grafting membrane was explained by analyzing the filtration resistance. In a word, this work demonstrated the feasibility and significance for preparing hydrophilic modification membrane via the “physical blending-base catalysis grafting” method and provided a theoretical support for improving anti-fouling capacity of membrane.

Visual aperiodic temporal prediction increases perceptual sensitivity and reduces response latencies

As a predictive organ, the brain can predict upcoming events to guide perception and action in the process of adaptive behavior. The classical models of oscillatory entrainment explain the facilitating effects that occur after periodic stimulation in behavior but cannot explain aperiodic facilitating effects. In the present study, by comparing the behavior performance of participants in periodic predictable (PP), aperiodic predictable (AP) and aperiodic unpredictable (AU) stimulus streams, we investigated the effect of an aperiodic predictable stream on the perceptual sensitivity and response latencies in the visual modality. The results showed that there was no difference between PP and AP conditions in sensitivity (d') and reaction times (RTs), both of which were significantly different from those in the AU condition. Moreover, a significant correlation between d' and RTs was observed when predictability existed. These results indicate that the aperiodic predictable stimulus streams increases perceptual sensitivity and reduces response latencies in a top-down manner. Individuals proactively and flexibly predict upcoming events based on the temporal structure of visual stimuli in the service of adaptive behavior.

Biosynthesis of Silver and Gold Nanoparticles Using Aqueous Extract of Codonopsis pilosula Roots for Antibacterial and Catalytic Applications

In this study, biogenic silver nanoparticles (AgNPs) and gold nanoparticles (AuNPs) were synthesized by a green approach using an aqueous extract from Codonopsis pilosula (CP) roots as a reducing and stabilizing agent. The formation of CP-AgNPs and CP-AuNPs was confirmed and optimized by UV-Vis spectroscopy. The CP-AgNPs and CP-AuNPs obtained under optimum conditions of metal ion concentration, reaction temperature, and reaction time were characterized by high-resolution transition electron microscopy (HR-TEM), selected area electron diffraction (SAED) analysis, field-emission scan electron microscopy (FE-SEM), powder X-ray diffraction (XRD) analysis, Fourier transform infrared (FTIR) spectroscopy, dispersive X-ray spectroscopy (EDX), and dynamic light scattering (DLS) method. It has been found that the biosynthesized CP-AgNPs and CP-AuNPs were formed in spherical shape with an average size of 10±2.5 nm and 20±3.2 nm, respectively. The biosynthesized metallic nanoparticles exhibited selective bacterial activity against three bacterial strains including two Gram-positive bacteria of Bacillus subtilis and Staphylococcus aureus and one Gram-negative bacteria of Escherichia coli. Meanwhile, there was no antibacterial activity detected toward Gram-negative Salmonella enteritidis. CP-AgNPs and CP-AuNPs also manifested an excellent catalytic performance in the reduction of 1,4-dinitrobenzene, 2-nitrophenol, 3-nitrophenol, and 4-nitrophenol.