The roles of green chemistry in nanotechnology and nanoscience fields are very significant the synthesis diverse nanomaterials. Herein, we report a method for synthesized colloidal silver nanoparticles (Ag NPs) polymeric media. Ag NPs were an aqueous solution using nitrate, polyethylene glycol (PEG), β-d-glucose as precursor, stabilizer, reducing agent, respectively. properties studied at different reaction times. ultraviolet-visible spectra excellent agreement with obtained nanostructure...

Keywords: silver nanoparticles, Curcuma longa , biosynthesis, green synthesis, transmission electron microscopy

Different biological methods are gaining recognition for the production of silver nanoparticles (Ag-NPs) due to their multiple applications. The use plants in green synthesis emerges as a cost effective and eco-friendly approach. In this study biosynthesis using Callicarpa maingayi stem bark extract has been reported. Characterizations were done different methods, which include; ultraviolet-visible spectroscopy (UV-Vis), powder X-ray diffraction (XRD), transmission electron microscopy (TEM),...

Green synthesis of silver/montmorillonite/chitosan bionanocomposites using the UV irradiation method and evaluation antibacterial activity Kamyar Shameli1, Mansor Bin Ahmad1, Wan Md Zin Yunus1, Abdolhossein Rustaiyan2, Nor Azowa Ibrahim1, Mohsen Zargar3, Yadollah Abdollahi41Department Chemistry, Faculty Science, Universiti Putra Malaysia, Serdang, Selangor, Malaysia; 2Department Science Research Campus, Islamic Azad University, Tehran, Iran; 3Faculty Food Biotechnology, 4Institute Advanced...

Photocatalytic degradation of p-cresol was carried out using ZnO under UV irradiation. The amount photocatalyst, concentration and pH were studied as variables. residual mineralization monitored a UV-visible spectrophotometer total organic carbon (TOC) analyzer, respectively. intermediates detected by ultra high pressure liquid chromatography (UPLC). highest photodegradation observed at 2.5 g/L 100 ppm p-cresol. P-cresol photocatalytic favorable in the range 6-9. 4-hydroxy-benzaldehyde...

High level of phosphotungstic acid (PWA) was self-immobilized on electrospun nylon nanofiberous sheet to fabricate highly selective methanol barrier layer for sandwich structured proton conducting membranes. Simple tuning the assembly conditions central and thickness outer Nafion layers allowed obtaining different composite membranes with superior properties (namely, P = 3.59 × 10–8 cm2 s–1) coupled conductivities reaching 58.6 mS cm–1 at 30 °C. Comparable activation energy transport more...

The equilibrium constants and thermodynamic parameters for complexation process between titanium (III) cation meso-octamethylcalix[4]pyrrole were determined by conductivity measurements in acetonitrile–ethanol (AN–EtOH) binary mixture at different temperatures. conductance data show that the stoichiometry of (meso-octamethylcalix[4]pyrrole.[Ti(OH)-(H2O)5])2+ complex all mixed solvents is 1:1[I:M]. stability formed sensitive to solvent composition a non-linear behavior was observed changes...

The introduction of low detection limit ion selective electrodes (ISEs) may well pave the way for determination trace targets cationic compounds. This research focuses on titanium (III) cation using a new PVC-membrane sensor based synthesized tris(2pyridyl) methylamine (tpm) ionophore. application and validation proposed was done potentiometric titration, inductively coupled plasma atomic emission spectrometry (ICP-AES) absorption (AAS). membrane exhibited Nernstian response to over...

The present paper reports the UV-assisted degradation of 1,4-benzoquinone in ZnO suspensions. variables studied include concentration 1,4-benzoquinone, photocatalyst, pH and total organic carbon. residue carbon were measured using UV-Visible spectrophotometer TOC analyzer, respectively. results showed that photodegradation was independent pH. photoactivity maximum at 1.0 g L-1 100 mg levels. Within 4-10 more than 80% can be removed. has demonstrated reusability process.

Due to the increasing industrial use of titanium compounds, its determination is subject considerable efforts. The ionophore or membrane active recognition most important component any polymeric sensor. sensor's response depends on and bonding between target ion. Ionophores with molecule-sized dimensions containing cavities semi-cavities can surround bond ion gives different selectivity sensitivity toward other ions. Therefore, ionophores binding strengths be used in sensor.In present work,...

The photodegradation of m-cresol was carried out under visible light (46% sunlight) by ZnO as photocatalyst. To measure the efficiency photodegradation, different variables studied included amount photocatalyst, concentration and pH. maximum photocatalyst 1.5 g/L 25 ppm respectively. favorable in pH 6-9 range. detected intermediates were 2-methyl-1,4-benzodiol, 2-methyl-para-benzoquinone, 3,5-dihydroxytoluene 2,5-dihydroxy-benzaldehyde. TOC studies show that 78% total organic carbon is...

Novel ionophores comprising various hydroxide and amine structures were immobilized onto poly(vinyl chloride) (PVC) matrices, these examined to determine Ti(III) selectivity. To predict the selectivity of Ti(III), a PVC membrane was used investigate binding c-methylcalix[4]resorcinarene (CMCR). The study showed that chelating ligand, CMCR, coordinated selectively at eight coordination sites involving oxygen atoms interface membrane/solution. prepared, based on CMCR as an ionophore, sodium...

Lipase‐catalyzed production of triethanolamine‐based esterquat by esterification oleic acid (OA) with triethanolamine (TEA) in n ‐hexane was performed 2 L stirred‐tank reactor. A set experiments designed central composite design to process modeling and statistically evaluate the findings. Five independent variables, including enzyme amount, reaction time, temperature, substrates molar ratio OA TEA, agitation speed, were studied under given conditions Design Expert software. Experimental data...

The complexity of reactions and kinetic is the current problem photodegradation processes. Recently, artificial neural networks have been widely used to solve problems because their reliable, robust, salient characteristics in capturing non-linear relationships between variables complex systems. In this study, an network was applied for modeling p-cresol photodegradation. To optimize network, independent including irradiation time, pH, photocatalyst amount concentration were as input...

The optimization processes of photo degradation are complicated and expensive when it is performed with traditional methods such as one variable at a time. In this research, the condition ortho-cresol (o-cresol) was optimized by using semi empirical method. First all, experiments were designed four effective factors including irradiation time, pH, catalyst's amount, o-cresol concentration % response surface methodology (RSM). RSM used central composite design (CCD) method consists 30 runs to...

The interactions of p-cresol photocatalytic degradation components were studied by response surface methodology. study was designed central composite design using the irradiation time, pH, amount photocatalyst and concentration as variables. performed to obtain photodegradation % actual responses. responses fitted with linear, two factor interactions, cubic quadratic model select an appropriate model. selected validated analysis variance which provided evidences such high F-value (845.09),...

Abstract In this study, estimation capabilities of the artificial neural network (ANN) and wavelet (WNN) based on genetic algorithm were investigated in a synthesis process. An enzymatic reaction catalyzed by Novozym 435 was selected as model The conversion response five independent variables; enzyme amount, time, temperature, substrates molar ratio agitation speed conjunction with an experimental design. After training neurons ANN WNN, using data 30 points, products used for 18 points....

The artificial neural network (ANN) modeling of m -cresol photodegradation was carried out for determination the optimum and importance values effective variables to achieve maximum efficiency. in suspension synthesized manganese doped ZnO nanoparticles under visible-light irradiation. input considered were irradiation time, pH, photocatalyst amount, concentration while efficiency only response as output. performed experiments designed into three data sets such training, testing, validation...