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Recovery of Phosphate by Magnetic Iron Oxide Particles and Iron Oxide Nanotubes in Water
Choi, Jeongyun,Chung, Jinwook,Lee, Wonhee,Lim, Han-Su,Kim, Jong-Oh Springer Netherlands 2016 Water, Air and Soil Pollution Vol.227 No.5
<P>In this study, we focused on the performance of phosphate recovery in the case of magnetic iron oxide (MIO) particles and iron oxide nanotubes (INTs) with synthetic wastewater. MIO particles were prepared by a co-precipitation method, and INTs were prepared with a potentiostatic anodization method of zerovalent iron foil in electrolyte-containing sulfate and fluoride. Although MIO had the fast adsorption rate, INT had a higher adsorption capacity per surface area rather than MIO. The adsorption isotherm of MIO and INT was approximated by a Freundlich type. Phosphate adsorbed on MIO and INT was effectively desorbed with alkaline solutions. For phosphate recovery, MIO needs a magnetic recovery device, whereas, when INT was used for phosphate recovery, another recovery step is not necessary. Both methods showed effective adsorption performance for phosphate recovery in wastewater.</P>
Choi, Eun Yong,Jeong, Jeongyun,Kang, Dong Il,Johnson, Kelly,Ercolani, Matt,Jang, Thomas,Lee, Dong Hyeon,Kim, Wun‐,Jae,Kim, Isaac Yi Blackwell Publishing Asia 2011 International journal of urology Vol.18 No.4
<P><B>Objective: </B> Lower urinary tract symptoms (LUTS) are a common complaint in patients with prostate cancer. We attempted to elucidate the effect of robot‐assisted radical prostatectomy (RARP) on patients having different preoperative LUTS severity through analysis of postoperative health‐related quality of life.</P><P><B>Methods: </B> From 1/2006 to 9/2009, over 500 patients underwent RARP at our institution. Preoperative American Urologic Association Symptom Score (AUA‐SS), preoperative Sexual Health Inventory for Men, and postoperative Expanded Prostate Cancer Index Composite were available in 183 of them. These patients were divided into three subgroups based on their AUA‐SS as follows: mild AUA‐SS (score 0–7) group, moderate AUA‐SS (8–19) group, and severe AUA‐SS (20–35) group.</P><P><B>Results: </B> Of the 183 men, 94 (51.4%), 70 (38.2%), and 19 (10.4%) were in the mild, moderate, and severe group, respectively. In the comparison of Expanded Prostate Cancer Index Composite domain subscales with mean score, only urinary domain had significant differences among subgroups. Patients with high preoperative LUTS persistently showed a statistical trend for decreased urinary function (<I>P</I> = 0.056) and suffered more from urinary bother postoperatively (<I>P</I> < 0.01). In the analysis of urinary bother items, all items except “bleeding with urination” showed statistically significant differences among the subgroups (<I>P</I> < 0.05).</P><P><B>Conclusions: </B> Even after RARP, patients with severe preoperative LUTS continue to have significant symptoms postoperatively. In analyzing urinary bother items, all LUTS items, including dysuria, storage symptoms, and postmicturition or voiding symptoms, were higher in patients with high preoperative AUA‐SS.</P>
Fe(II)-initiated reduction of hexavalent chromium in heterogeneous iron oxide suspension
이우진,Jeongyun Choi,Yoojin Jung 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.4
The characteristics of Fe(II)-initiated reduction of Cr(VI) in iron oxide suspensions were investigated by conducting a series of kinetic experiments. A modified Langmuir-Hinshelwood kinetic model was used to provide a better description of Cr(VI) reduction kinetics which were believed to be occurring on the limited reactive site of reductant. The concentration of magnetite concentration as well as Cr(VI) concentration, significantly affected the reaction kinetics of Cr(VI). The reduction kinetics were improved with increasing magnetite and Cr(VI) concentration. Almost 95% of Cr(VI) reduction was achieved within 10 min at the condition of 8 g/L of magnetite and 80 mg/L of initial Cr(VI), respectively. The solution pH also affected the reaction rate in the range of 5.5 and 8.0 where a lower pH produced a faster reaction rate. The addition of Fe(II) on soil and magnetite showed the capability of improving Cr(VI) reduction kinetics, and their reduction kinetics was also well described by using a Langmuir-Hinshelwood kinetic model. The experimental results obtained in this research clearly show the advantage of additional reductant for reducing Cr(VI), and they can provide basic knowledge for the development of remediation technology for the treatment of groundwater and soil contaminated with Cr(VI).