An agitation impeller with shrouded blades—specifically, a closed impeller—was redesigned. A closed impeller originating from a conventional turbine-type impeller was analyzed by considering the internal liquid flow characteristics. As a result, an impeller consisting of six flat blades with radially tapered widths was developed for closed-mode operation. The modified closed...
This study explores early formulation parameters influencing hydroxypropyl cellulose (HPC)-based microparticles as carriers for paracetamol, with the aim of establishing a modified-release drug delivery system and informing future design optimization. Microparticles were prepared via the oil-in-oil emulsion/solvent evaporation method using acetone, HPC as a thermo-responsive...
This work examines the effect of Pulicaria odora leaf extract effect as a green inhibitor on SS308 steel corrosion in a 1 mol L–1 hydrochloric acid solution. The electrochemical results reveal that inhibitory efficiency increases with the concentration of Pulicaria odora leaf extract, reaching a maximum inhibition rate of 94.6 % at 500 ppm. Potentiodynamic polarization curves...
The bioeconomy today relies mostly on sugar and physicochemical extraction processes, which limit both cost reduction and scale-up potential, yet these two aspects are vital for the market success of circular bioeconomy products. Gas fermentation is a platform technology that utilizes all kinds of waste biomass streams through low-cost, clean, and well-defined gaseous substrates...
Xanthan gum, a microbial exopolysaccharide produced by Xanthomonas campestris, exhibits exceptional rheological behavior, structural versatility, and environmental resilience, making it indispensable across food, pharmaceutical, cosmetic, and industrial sectors. This review critically examines its biosynthesis, molecular configuration, and physicochemical properties, with...
Visco Jet® impellers have been available for several years and are marketed as an alternative to other standard impeller types, such as pitched blade impellers, Rushton turbines, or hydrofoils. However, their performance has not yet been evaluated in the scientific literature. This article aims to address this gap by reviewing two basic Visco Jet® impeller types: the Classic and...
The reaction of hydrochloric acid with hydrocarbons in petrochemical plants produces a viscous hydrocarbon compound called green oil. This oil can cause corrosion problems in the internal parts of equipment. As an alternative to the adsorption process used to remove hydrochloric acid, a simulation model is presented to efficiently absorb hydrochloric acid from an off-gas stream...
Coagulation is a critical step in water treatment, with polyaluminum chloride being a commonly used coagulant. Its main mechanisms are charge neutralization and sweep coagulation. Minimizing sweep coagulation, when appropriate, can reduce chemical use and improve sludge management. A Fuzzy Inference System (FIS) is an effective tool for handling uncertainties and is often used...
γ-Al2O3 has been widely studied as a very promising catalyst for the benzene alkylation reaction. In this study, the γ-Al2O3 support was prepared by the hydrothermal synthesis method, and the Cu-γ-Al2O3 catalyst was prepared by loading Cu through the impregnation treatment method with copper nitrate. Moreover, the Cu-γ-Al2O3 and γ-Al2O3 catalysts were characterized by X-ray...
Corrosion causes significant damage to materials and equipment, prompting the search for effective inhibitors. This study investigates the use of Carpobrotus acinaciformis (CA) leaf extracts as alternative corrosion inhibitors for C1020 carbon steel in hydrochloric acid (HCl). Two extraction methods were employed: aqueous (denoted as CAW) and methanolic (denoted as CAM) extracts...
Supplementary cementitious materials (SCMs), such as fly ash, blast furnace slag, rice husk ash (RHA), and sugarcane bagasse ash (SBA), are increasingly used to promote sustainable construction practices. However, understanding how the chemical composition, fineness, reactive phases, and pore solution content of SCMs affect the reaction process and hydration of cement is...
This study aimed to investigate the interactions between naringin and dietary fiber from yeast (zymosan A) through adsorption and desorption processes. The effects of different solution pH conditions (pH 3.0, pH 7.0, and pure water at pH 5.5), as well as varying initial concentrations of zymosan A and naringin, on their interaction were examined. The adsorption capacity of...
In this study, the cationic surfactant hexadecyl trimethylammonium bromide (HDTMA) was loaded onto coal fly ash and subsequently utilized for wastewater treatment. The surfactant-treated ash was characterized to investigate its porosity, surface morphology, thermal stability, and the presence of surface functional groups. Experimental studies were conducted under varying solution...
Globally, a significant portion of plastics are mismanaged, ultimately ending up in the environment. While reducing, reusing, and recycling plastics should be the preferred end-of-life scenarios, biodegradable plastics are compatible with all of these routes and represent a promising alternative. Polyhydroxyalkanoates (PHAs), a family of polyesters synthesized by various...
The ternary two-liquid phase system consisting of neopentyl glycol, sodium formate, and water was studied at pH values of 3, 4, 5, and 6. This study examined the effect of pH on phase diagrams, focusing on the length and slope of the tie-lines between the two conjugated phases. The results showed that the two-phase region expanded, and both the length and slope of the tie-lines...
Biochar derived from abundant waste biomass has emerged as an eco-friendly alternative to conventional adsorbents. In this study, biochar produced from golden snail shells through a simple pyrolysis process was applied for phosphorus adsorption. The effects of pyrolysis temperature and time on adsorption capacity were investigated. The biochar pyrolyzed at 800 °C for 90 min (B800...
This study investigates the effects of the treatments (substrate analogue imprinting and ionic liquid coating) on the catalytic activity and thermostability of lipase from Burkholderia cepacia in the transesterification of vinyl acetate with benzyl alcohol. The catalytic activity was significantly enhanced when the lipase was coated with a Brij 56-based ionic liquid or surfactant...
Polyvinylpyrrolidone (PVP) is widely recognized for its hydrophilic properties, making it essential in pharmaceutical and biomedical industries as a carrier material. This review examines PVP-enriched delivery systems, emphasizing their capacity to integrate diverse active agents from both organic and synthetic sources. The versatility of PVP is showcased through its use in...
A mesoporous MFI zeolite membrane was synthesized using polyacrylamide as a secondary template to separate nickel, chromium, and nitrate ions from water. Various analytical methods were employed to characterize the zeolite powders and membranes. Subsequently, tests were conducted to evaluate water permeation and the rejection of heavy metals and nitrate ions. The incorporation of...
Levulinic acid (LA) is a significant building block in industry. It can be produced by the hydrolysis of lignocellulosic feedstocks and needs to be separated from the aqueous production medium. This study focuses on evaluating fly ash, a waste byproduct from a sugar factory, for use in the adsorption of LA from aqueous media. The sugar beet processing fly ash (SBFA) was...
Green corrosion inhibitors have shown considerable promise as a viable alternative to synthetic inhibitors for preventing corrosion in various applications. In this study, the aquatic plant Eichhornia crassipes (water hyacinth), native to the Pantanal region, was evaluated for its potential as a green corrosion inhibitor for AISI 1005 steel in an electrolyte containing 0.01 mol L...
This study investigates the adaptation of activated sludge for nicotine degradation by introducing glucose as a co-substrate. The acclimation process significantly improved nicotine biodegradability, leading to its complete degradation. In contrast, the non-acclimated sludge removed less than 10 % of nicotine over the same period. The acclimated system achieved effluent nicotine...
Lignocellulosic biorefineries (LBRs) are platforms for the production of a variety of bio-based products such as biofuels, biomaterials, biochemicals, food, and feed using lignocellulosic biomass (LB) as feedstock. LBRs are still rare worldwide. Their commercialization depends on challenges associated with the entire feedstock supply chain, efficiency, sustainability, and scale...
Nanoparticle formulation development for drug delivery, a crucial aspect of nanotechnology, encounters numerous challenges. These encompass selecting appropriate excipients, comprehending miscibility and solubility factors, ensuring efficient drug encapsulation and release, assessing stability, and facilitating drug transport in the bloodstream for accurate targeting and...
Porphyrins are a group of organic heterocyclic macromolecules, composed of four modified pyrrole subunits interconnected at their α carbon atoms via methine bridges. This unique and significant group of compounds has a special relationship with inorganic clay minerals, which are hydrous aluminium phyllosilicates. Clay minerals, known to be typical layered materials, act as unique...