The Experts below are selected from a list of 38979 Experts worldwide ranked by ideXlab platform
Y Z Sun - One of the best experts on this subject based on the ideXlab platform.
-
extraction and separation of in iii ga iii and zn ii from Sulfate Solution using extraction resin
Hydrometallurgy, 2006Co-Authors: Jianshe Liu, Hou Chen, X Y Chen, Z L Guo, C P Liu, Y Z SunAbstract:Abstract The separation of In(III), Ga(III) and Zn(II) from Sulfate Solution has been studied using an extraction resin containing 2-ethylhexyl phosphoric acid mono(2-ethylhexyl) ester (P507 extraction resin). The effect of pH on the extraction of each metal was determined. Extraction isotherms were then constructed at selected pH. Results show that In(III) is first extracted from aqueous Solutions at pH 2.0 using this resin while Ga(III) and Zn(II) are co-extracted at pH 3.0. Their separation can be carried out using HCl of different concentrations as eluants. The saturation adsorption capabilities of indium(III) and gallium(III) were evaluated as 47.2 and 31.0 mg/g or 0.41 and 0.44 mmol/g, respectively. The molar ratio of metal ion: P507 reagent on resin was about 1:3. Loaded resins can be regenerated, and the metals can be recovered selectively. Two fixed-bed columns arranged in-series were successfully used for the separation and recovery of these three metal ions from a multi-component Solution.
Mark Vb Cleveland - One of the best experts on this subject based on the ideXlab platform.
-
a comparison of oral Sulfate Solution with sodium picoSulfate magnesium citrate in split doses as bowel preparation for colonoscopy
Gastrointestinal Endoscopy, 2014Co-Authors: Jack A Dipalma, John E Mcgowan, Mark Vb ClevelandAbstract:Background There are few data comparing U.S. Food and Drug Administration–approved low-volume bowel preparations for colonoscopy. Objective To compare oral Sulfate Solution (OSS) with sodium picoSulfate plus magnesium citrate (SP+MC) for bowel cleansing efficacy. Design Single-blind, randomized, controlled trial. Setting Ten U.S. centers. Patients Outpatients undergoing colonoscopy for routine indications. Interventions Patients were randomized to undergo bowel preparation with OSS or SP+MC. Both preparations were given in split doses. Main Outcome Measurements Cleansing efficacy on a 4-point scale from excellent (4) to poor (1). Results Among 338 randomized patients who took preparation, OSS resulted in a higher rate of successful (excellent or good) preparation (94.7% vs 85.7%; P = .006) and more excellent preparations (54% vs 26%; P Limitations The preparation grading scale has been used in previous studies and has regulatory acceptance but has not been formally validated. Conclusion The U.S. Food and Drug Administration–approved split-dose regimen of OSS provides superior bowel cleansing compared with the approved split-dose regimen of SP+MC. (Clinical trial registration number: NCT01786629.)
-
a randomized controlled trial of oral Sulfate Solution plus polyethylene glycol as a bowel preparation for colonoscopy
Gastrointestinal Endoscopy, 2014Co-Authors: John E Mcgowan, Mark Vb Cleveland, Jack A Di PalmaAbstract:Background No bowel preparation for colonoscopy is optimal with regard to efficacy, safety, and tolerability. New options for bowel preparation are needed. Objective To compare a new hybrid preparation consisting of a reduced dose of oral Sulfate Solution (OSS) plus 2 L of Sulfate-free electrolyte lavage Solution (SF-ELS) with 2 low-volume preparations based on polyethylene glycol electrolyte lavage Solution (PEG-ELS). Design Two randomized, controlled trials. Setting Twenty-four U.S. centers. Patients A total of 737 outpatients undergoing colonoscopy. Interventions In study 1, OSS plus SF-ELS was given as a split dose, and in study 2, OSS plus SF-ELS was given in its entirety the evening before colonoscopy. In study 1, the active control was 2 L of PEG-ELS plus ascorbic acid (PEG-EA) given as a split dose. In study 2, the control was 10 mg of bisacodyl plus 2 L of SF-ELS taken the evening before colonoscopy. Main Outcome Measurements Rates of successful (good or excellent) bowel preparation. Results In study 1, the rates of successful (excellent or good) preparation with OSS plus SF-ELS and PEG-EA were identical at 93.5% for split-dose preparation. OSS plus SF-ELS was noninferior to PEG-EA ( P P P = .042), and bloating was rated worse with PEG-EA ( P = .025). In study 2, overall discomfort was rated worse with OSS plus SF-ELS (mean score 2.1 vs 1.8; P = .032). There were no deaths in either study and no serious adverse events considered related to the preparation. Limitations Bowel cleansing was not scored by colon segment. Adenoma detection was not compared between the regimens. Conclusion OSS plus SF-ELS is a new, safe, and effective bowel preparation for colonoscopy.
-
a randomized clinical study comparing reduced volume oral Sulfate Solution with standard 4 liter Sulfate free electrolyte lavage Solution as preparation for colonoscopy
Gastrointestinal Endoscopy, 2010Co-Authors: Douglas K Rex, John E Mcgowan, Jack A Di Palma, Reynaldo Rodriguez, Mark Vb ClevelandAbstract:Background Low-volume bowel preparations for colonoscopy improve tolerability. Objective We compared the efficacy, tolerability, and safety of a new low-volume Sulfate Solution with a standard 4-L polyethylene glycol electrolyte lavage Solution as bowel preparation for colonoscopy. Design Multicenter, single-blind, randomized, noninferiority study. Setting Five academic and community endoscopy centers in the United States. Patients One hundred thirty-six outpatients undergoing colonoscopy. Interventions Patients were randomized to receive 4 L Sulfate-free electrolyte lavage Solution (SF-ELS) given the night before colonoscopy versus 12 oz oral Sulfate Solution (OSS) given in equally divided doses the evening before and the morning of colonoscopy. Main Outcome Measurements Successful (ie, good or excellent) bowel preparation. Results Successful bowel preparation was more frequent with OSS than with SF-ELS (98.4% vs 89.6%; P = .04). Excellent preparation also was achieved more frequently with OSS (71.4% vs 34.3%; P Limitations The OSS was administered in split doses, whereas the SF-ELS was administered the evening before (which is its FDA-approved regimen). Conclusions Oral Sulfate Solution is promising as a safe low-volume preparation for colonoscopy. (Clinical trial registration number: NCT00856843.)
Jianshe Liu - One of the best experts on this subject based on the ideXlab platform.
-
extraction and separation of in iii ga iii and zn ii from Sulfate Solution using extraction resin
Hydrometallurgy, 2006Co-Authors: Jianshe Liu, Hou Chen, X Y Chen, Z L Guo, C P Liu, Y Z SunAbstract:Abstract The separation of In(III), Ga(III) and Zn(II) from Sulfate Solution has been studied using an extraction resin containing 2-ethylhexyl phosphoric acid mono(2-ethylhexyl) ester (P507 extraction resin). The effect of pH on the extraction of each metal was determined. Extraction isotherms were then constructed at selected pH. Results show that In(III) is first extracted from aqueous Solutions at pH 2.0 using this resin while Ga(III) and Zn(II) are co-extracted at pH 3.0. Their separation can be carried out using HCl of different concentrations as eluants. The saturation adsorption capabilities of indium(III) and gallium(III) were evaluated as 47.2 and 31.0 mg/g or 0.41 and 0.44 mmol/g, respectively. The molar ratio of metal ion: P507 reagent on resin was about 1:3. Loaded resins can be regenerated, and the metals can be recovered selectively. Two fixed-bed columns arranged in-series were successfully used for the separation and recovery of these three metal ions from a multi-component Solution.
Wei Sun - One of the best experts on this subject based on the ideXlab platform.
-
degradation mechanism of slag blended mortars immersed in sodium Sulfate Solution
Cement and Concrete Research, 2015Co-Authors: Wei Sun, Karen ScrivenerAbstract:Additions of slag are usually considered to give cementitious materials which perform well in Sulfate bearing environments. This paper compares the deterioration of slag cement blends to those of plain Portland cement and demonstrates that this occurs more through loss of surface than macroscopic expansion. When slag blended mortar is immersed in sodium Sulfate Solution, the Sulfate ions penetrating into samples are mostly fixed by aluminate phases in a relatively narrow region close to surface, due to the refinement of pore size and buffering effect by slag addition. After all available aluminate phases have been reacted, the concentration of Sulfate ion in pore Solution will increase. Once the Solution concentration reaches a critical level, fine AFm crystals confined within the C-S-H can react to form ettringite, exerting expansion force. If the system contains sufficient confined AFm phases, this process can cause spalling of the surface layer. Then, Sulfate ions can penetrate into the sound area, manifesting another expansive area. Furthermore, the penetration depth of slag sample does not depend strongly on the concentration of Sulfate Solution, but higher concentration increases the crystallization pressure of ettringite, thereby causing more damage. (C) 2015 Elsevier Ltd. All rights reserved.
-
effect of Sulfate Solution on the frost resistance of concrete with and without steel fiber reinforcement
Cement and Concrete Research, 2002Co-Authors: Changwen Miao, Qian Tian, Wei SunAbstract:Abstract Properties of plain concrete (PC) and steel fiber reinforced concrete(SFRC) (with water/cement ratio of 0.44, 0.32 and 0.26) subjected to freeze–thaw cycles in 5.0% sodium Sulfate Solution were investigated in this paper. It was found that during the initial 300 freeze–thaw cycles, Sulfate Solution had little effect on the relative dynamic modulus of elasticity (Ed) of concrete. In further freeze–thaw cycling, the effect of Sulfate Solution on Ed was much more obvious. Both PC and SFRC specimens with w/c of 0.44 failed before 300 cycles and exhibited similar developing trends of the Ed whether freezing and thawing in Sulfate Solution or in fresh water. As for the concrete specimens with w/c of 0.26, the decline of Ed was more serious when freezing and thawing in Sulfate Solution than that in fresh water after 300 cycles. The adoption of steel fiber greatly restrained the decline of Ed and changed the failure mode of the specimen from brittle crack in midspan of PC to gradually decline of Ed up to failure under the combined action of freeze–thaw cycles and Sulfate attack. Test results also demonstrated that there was an interaction effect between the action of freeze–thaw cycles and Sulfate attack.
Jae Chun Lee - One of the best experts on this subject based on the ideXlab platform.
-
Solvent extraction of cadmium from Sulfate Solution with di-(2-ethylhexyl) phosphoric acid diluted in kerosene
Hydrometallurgy, 2009Co-Authors: Vinay Kumar, Manis Kumar Jha, Jinki Jeong, Manoj Kumar, Jae Chun LeeAbstract:In the present paper, solvent extraction process has been used for extraction of cadmium from Sulfate Solution using di-(2-ethylhexyl) phosphoric acid (D2EHPA) with 1% isodecanol in kerosene diluent expected from industrial effluents or leaching of ores/secondary materials. Different process parameters such as pH, contact time, extractant concentration, O/A ratio etc. were investigated. Results demonstrated that quantitative extraction of cadmium was feasible from 4.45 mM cadmium feed Solution in single stage at equilibrium pH 4.5, time 2 min and O/A ratio 1:1 with 0.15 mM D2EHPA. The extraction mechanism of cadmium from Sulfate Solution by D2EHPA in kerosene could be represented at equilibrium by Cd2+ + 3/2 (H2A2)org ⇔ CdA2(HA)org + 2H+. The loading capacity of 0.15 mM D2EHPA in Sulfate Solution was determined to be ∼ 8.9 mM cadmium. The loaded cadmium was effectively stripped using 180 g/L sulfuric acid. The metal or salt could be produced by electrolysis or crystallization from the stripped Solution. © 2008.
