Hydrogen fluoride (HF) is a basic raw material for a wide variety of industrial products, with a worldwide production capacity of more than three million metric tonnes. A novel method for determining particulate fluoride and gaseous hydrogen fluoride in air is presented herewith. Air was sampled using miniaturised 13 mm Swinnex two-stage filter holders in a medium-flow pumping system and throug...

The filtration of liquid sulfur is a key operation in the production sulfuric acid that used for phosphate fertilizer Morocco and elsewhere. purpose process to remove solid impurities from sulfur, which could clog burner spray nozzles, leading reduction lifetime unit. standard life cycle units 24 months, while due clogging, this can be reduced less than 18 obviously tremendous economic disadvan...

Background: Cellulose is hydrolyzed to sugar monomers by the synergistic action of multiple cellulase enzymes: endo-β-1,4-glucanase, exo-β-1,4 cellobiohydrolase, and β-glucosidase. Realistic modeling of this process for various substrates, enzyme combinations, and operating conditions poses severe challenges. A mechanistic hydrolysis model was developed using stochastic molecular modeling appro...

We screened members of a new genus of grass-associated diazotrophs (Azoarcus spp.) for the presence of cellulolytic enzymes. Out of five Azoarcus strains representing different species, only in the endorhizosphere isolate BH72, which is also capable of invading grass roots, was significant endoglucanase activity, in addition to beta-glucosidase and cellobiohydrolase activity, present. Reducing ...

Bacterial cellulose is a biological polymer with a variety of extraordinary properties which make it a functional material for different industrial fields. This work aimed at monitoring the effects of three different organic acids and nanoparticles on the production, water holding capacity and structural characteristics of bacterial cellulose. Different concentrations of organic acids and nanop...

Cellulose is the most abundant biorenewable material, with a long and well-established technological base.1 Derivitized products have many important applications in the fiber, paper, membrane, polymer, and paints industries. Cellulose consists of polydisperse linear glucose polymer chains (Figure 1) which form hydrogen-bonded supramolecular structures;2 cellulose is insoluble in water and most ...

Abstract. The spatiotemporal variations in free-cellulose concentrations atmospheric particles, as a proxy for plant debris, were investigated using an improved protocol with high-performance liquid chromatography pulsed amperometric detection (HPLC-PAD) method. Filter samples taken from nine sites of varying characteristics across France and Switzerland, sampling covering all seasons. Concentr...

The purpose of this study was to utilize low quality date syrup, a rich and available source of nutrient in Iran, for the production of bacterial cellulose using Gluconacetobacter xylinus. Static batch fermentationfor the purpose of cellulose production by G. xylinus (PTCC, 1734) was studied using low quality date syrupand sucrose solution (Bx. 10%) as fermentation media at 28°C. Re...

Preconcentration of Cd and Pb at ultratrace level in waters following filtration through silver nanoparticles-cellulose composites used for thin-film microextraction was performed. The new procedure based on the formation pyrrolidine dithiocarbamate (APDC) derivatives, which showed a large affinity toward AgNPs. For this purpose, cellulose filters modified with AgNPs were prepared situ upon red...

A facile method to prepare hybrid cellulose acetate nanofibers containing TiO2 (TiO2-CA nanofibers) by emulsion electrospinning technique was developed for the denitrification and filtration of particulate matters (PMs). This work found that TiO2-CA mainly contain anatase form TiO2, contributing photodecomposition NO gas under UV irradiation. The also showed an excellent efficiency 99.5% PM0.5 ...