Determination Of Zn Species Using Ultrafiltration And Different Solid Sorbents.

A method for the determination of operationally-defined metal species at natural concentration levels has been developed. The method is based on a combination of physical characterization by size fractionation using ultrafiltration and chemical characterization by retention studies on different solid sorbents

Determination Of Zinc Species Using Ultrafiltration And Different Solid Sorbents.

A method or the determination of operationally-defined metal species at natural concentration levels has been developed. The method is based on a combination of physical characterization by size fractionation using ultrafiltration and chemical characterization by retention studies on different solid sorbents

Formation of Gold Microstructures By Galvanic Reduction on Carbon Surfaces.

Electrodeposition of metal nanocrystals onto carbon surfaces widely investigated

Treatment of hexavalent chromium using a galvanic flow cell with different flow configurations

Wastewater sources involve two general types, chromium-related and non-chromium wastewaters (Patterson, et al., 1994). Although chromium is present in both the trivalent and hexavalent state in process solutions and wastes, the dominant species is hexavalent chromium (Pollution prevention and control technologies for plating operations, 2000)

Pre-Service Teachers' Understanding And Awareness Of Sustainable Development Concepts And Traditional Environmental Concepts

This paper discusses the findings from a survey conducted to investigate the level of awareness and understanding of traditional environmental concepts and sustainable development concepts among pre-service teachers. The survey involved 110 pre-service teachers enrolled in the chemistry teaching methods course. The student teachers were requested to complete a set of 20-item questionnaire on environmental knowledge. Awareness and understanding of concepts central to sustainable development is particularly significant for the pre-service teachers who are required to educate and promote education for sustainable development. Results of the study showed that the preservice teachers have a low level of awareness and understanding of concepts central to sustainable development compare to traditional environmental concepts. Recognising the importance of sustainability knowledge in leading sustainable lifestyle, the findings of this paper emphasise the need impart sustainable development knowledge through teaching and learning proces

Prevalence, factors influencing and knowledge about adherence to lipid-lowering therapy among hyperlipidemia patients

Background: Hyperlipidaemia is a significant risk factor for cardiovascular disease. However, adherence to lipid-lowering therapy is often unsatisfactory due to a combination of patient factors, therapy, socio-economic and health system-related factors. Aims: to identify the prevalence of adherence to lipid-lowering therapy, the factors contributing to non-adherence and knowledge regarding hyperlipidaemia and its’ treatment among Malaysian patients with hyperlipidemia. Methods: A quantitative study using a cross-sectional survey was carried out in an urban primary care clinic in August 2015. Patients on lipid-lowering therapy for ≥ 1 year aged ≥ 18 years were selected using simple random sampling. consenting patients answered a self-administered questionnaire (in Malay/English) which included socio-demographic profile, hyperlipidaemia profile, adherence to lipid-lowering therapy (using the Morisky Medication Adherence scale-8; score ≥ 6 taken as adherent), reasons leading to non-adherence, knowledge regarding hyperlipidaemia and its’ treatment, and use of non-allopathic medicine. Results: the response rate was 90.7%. the prevalence of adherence to lipid-lowering therapy was 82.4%. “the most common reasons for non-adherence was being worried about side effect of lipid-lowering agent (71.4%), followed by the need to take too many drugs in a day (61.4%) and negative influences by friends, relative and mass media (60%)”. Factors associated with non-adherence include male gender, on longer duration of therapy, less frequency of follow-up, less number of follow-up clinics, taking medication at night/random timing and having lower knowledge scores. Conclusion: Overall the prevalence of adherence was high in patients with hyperlipidaemia. Interventions to boost adherence should target those who were identified as non-adherent

A new insight to the physical interpretation of activated carbon and iron doped carbon material: sorption affinity towards organic dye

To enhance the potential of activated carbon (AC), iron incorporation into the AC surface was examined in the present investigations. Iron doped activated carbon (FeAC) material was synthesized and characterized by using surface area analysis, energy dispersive X-ray (EDX), temperature programmed reduction (TPR) and temperature programmed desorption (TPD). The surface area of FeAC (543 m2/g) was found to be lower than AC (1043 m2/g) as a result of the pores widening due to diffusion of iron particles into the porous AC. Iron uploading on AC surface was confirmed through EDX analysis, showing up to 13.75 wt.% iron on FeAC surface. TPR and TPD profiles revealed the presence of more active sites on FeAC surface. FeAC have shown up to 98% methylene blue (MB) removal from the aqueous media. Thermodynamic parameters indicated the spontaneous and exothermic nature of the sorption processes

Hybrid polymer inclusion membrane as anion exchange membrane for recovering Pd2+ ions in electrogenerative process

A novel non-plasticized nano-porous hybrid inorganic-organic polymer inclusion membrane (PIM) was synthesized, characterized, and evaluated as an anion exchange membrane for application in electrogenerative processes to recover Pd2+ ions. Ionic liquids 1-ethyl-3-me­thyl­imidazolium chloride (EMIM-Cl) and 1-butyl-3-methylimidazolium chloride (BMIM-Cl) were used as the carrier molecules in the polymeric network of PIM to enhance anion exchange process. This hybrid anion exchange membrane also consists of a polymeric matrix of non-plasticized cellulose triacetate modified by incorporating an inorganic material (silane) prepared by the sol-gel route. Different parameters affecting the ion transport performance efficiency, i.e., the composition of the membrane, type of ionic liquid (carrier molecule) and ion–exchange capacity, were investigated and optimized. In the electrogenerative process, the results revealed that the prepared PIM yields better recovery results for recovering Pd2+ ions from its chloride solution compared to the commercial anion exchange membrane Neosepta® AM-01, with a full recovery of 100 mg/L Pd2+ ions in 30 min. This preliminary study shows that the prepared low-cost hybrid anion exchange membrane PIM can act as an inexpensive material suitable for the rapid and efficient recovery of Pd2+ ions from an aqueous solution