Removal of methylene blue dye from wastewater by using supported liquid memberane technology

The present work describes the application of Supported Liquid Membrane (SLM) technology towards the removal and recovery of a cationic dye (Methylene Blue) from aqueous solutions. Natural and non-toxic vegetable oils have been impregnated on microporous polymeric films of polyvinylidene fluoride (PVDF) to constitute a liquid membrane. Different parameters affecting the transport, like pH of feed solution, acid concentration in the strip solution, initial dye concentration, oil types and stirring speeds have been investigated. Highest value of flux (1.7 × 10−5 mg/cm2/sec1) for methylene blue dye was achieved with sunflower oil impregnated on the PVDF support, with pH maintained at 12 in the feed solution and 0.3 M hydrochloric acid concentration in the strip solution. It took 6 hours to transport maximum amount of dye under optimum conditions.

Separation of trivalent actinides from lanthanides in an acetate buffer solution using Cyanex 301

SummaryThe separation of trivalent actinides from the lanthanides using the active extractant in the Cyanex 301 reagent, bis(2,4,4-trimethylpentyl)dithiophosphinic acid, was studied. Specifically, the extractant was studied with an ammonium acetate/acetic acid buffered feed that would result from a transuranic separation process utilizing an ammonium acetate strip solution. Separation factors of

Porous Alumina-Silica (Gubka) as a Matrix for REE-TUE Strip Solution Immobilization

ABSTRACTThe immobilisation of strip product (TUE + REE), collected at Russian research centers and laboratories during R&D on partitioning technology for liquid high–level radioactive waste (HLW), was studied using simulated solutions.Ultraporous glass crystalline material “Gubka”(G) and multiple processing stages were used to immobilize the simulated strip product. The processing consisted of the following stages: Gubka saturation by solution – drying into Gubka pores – compaction by cold uniaxial pressing followed by sintering (CUPS) or hot uniaxial pressing (HUP).