Selective catalytic reduction (SCR) has been a promising technology to reduce the air pollution caused by nitrogen oxides (NOx) in several industries. The consumption of SCR catalysts increases every year as technology evolves, however those have a limited lifespan and usually end up in landfills after they deactivate. Currently, the most widely used catalyst for and stationary applications is V 2 O 5 -WO 3 /TiO 2 which can contain around 50% wt V 2 O 5 and 7-10% wt of WO 3 . The vast uses for both vanadium 56
In this study, adsorption/desorption characteristics of uranium ion was investigated using an anion exchangeresin. After anionization of uranyl(UO2
2+) ion, batch tests were conducted using A500/2788 as an anion exchange resin. Adsorption tests were conducted for various concentrations of acid, temperatures, concentrations of uranium ions and adroption times whereas desorption tests were conducted for various concentrations of H2SO4 and reaction times. According to test results, the highest adsorption of uranium ion was obtainde in 0.01 M H2SO4 solution while the adsorption decrease in the strong acidic solution. Also, the adsorption rate was found to adsorption capacity. Furthermore, the adsorption results were found to respond well to Langmuir isotherm equation and follow the pseudo second-order kinetic model. In case of desorption tests, the high desorption was obtained in concentrated H2SO4 solutions. Desorption of more than 70% was obtained at the beginning of 60 minutes while the desorption rate decreased gradually and reached to the equilibrium after 6 hours.
BACKGROUND
Knot impingement as a complication after arthroscopic rotator cuff repair (ARCR) has been suggested as a cause of persistent pain with limited motion. We report on a case involving a patient who developed knot impingement after ARCR who complained of acute onset of pain with limited motion, which was confused with infection.
CASE SUMMARY
A 55-year-old female who complained of severe pain with limited motion of the right shoulder visited our emergency room. Passive range of motion could not be evaluated due to the patient’s severe pain. The patient had undergone ARCR using a suture-bridge technique at a local clinic four months ago for treatment of a small supraspinatus tear of the right shoulder. An erosive change of the undersurface of the acromion was observed on plain radiographs of the right shoulder, and a moderate amount of bursal fluid and synovial thickening with enhancement was observed by magnetic resonance imaging. Results of an analysis of the aspirated fluid showed that the WBC count was 3960 with 90% neutrophils. The arthroscopic view showed healing of the repaired supraspinatus tendon and loose suture threads and knots with severe subacromial bursitis were observed. Debridement of inflammatory tissues of the glenohumeral joint and subacromial space was performed for the removal of all suture materials. The patient’s symptoms subsided immediately after the surgical procedure.
CONCLUSION
Although the incidence of knot impingement is rare, the possibility of knot impingement after ARCR should be a consideration.
In new millennium, wide-reaching demands for selective catalytic reduction (SCR) catalyst have been increased gradually in new millennium. SCR catalyst can prevent the NO x emission to protect the environment. In SCR catalyst the main composition of the catalyst is typically TiO 2 (70~80%), WO 3 (7~10%), V 2 O 5 (~1%) and others. When the SCR catalysts are used up and disposed to landfills, it is problematic that those should exist in the landfill site permanently due to their extremely low degradability. A new advanced technology needs to be developed primarily to protect environment and then recover the valuable metals. Hydrometallurgical techniques such as leaching and liquid-liquid extraction was designed and developed for
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