Characterization of primary precipitate composition formed during co-removal of Cr(VI) with Cu(II) in synthetic wastewater

2005 ◽  
Vol 13 (6) ◽  
pp. 379-385 ◽  
Author(s):  
Jing-Mei Sun ◽  
Wen-Ting Zhu ◽  
Ju-Chang Huang
Keyword(s):  
Synthetic Wastewater ◽  
Primary Precipitate ◽  
Co Removal ◽  
Precipitate Composition

Mn-Mo-O Catalysts for Methanol Oxidation. I. Preparation and Characterization of the Catalysts

1992 ◽  
Vol 57 (12) ◽  
pp. 2529-2538 ◽  
Author(s):  
Krasimir Ivanov ◽  
Penka Litcheva ◽  
Dimitar Klissurski
Keyword(s):  
Methanol Oxidation ◽  
Solution Concentration ◽  
Alkaline Media ◽  
Acidic Media ◽  
Chemical Methods ◽  
X Ray ◽  
Ph Values ◽  
Precipitate Composition

Mn-Mo-O catalysts with a different Mo/Mn ratio have been prepared by precipitation. The precipitate composition as a function of solution concentration and pH was studied by X-ray, IR, thermal and chemical methods. Formation of manganese molybdates with MnMoO4.1.5H2O, Mn3Mo3O12.2.5H2O, and Mn3Mo4O15.4H2O composition has been supposed. It is concluded that pure MnMoO4 may be obtained in both acid and alkaline media, the pH values depending on the concentration of the initial solutions. The maximum Mo/Mn ratio in the precipitates is 1.33. The formation of pure Mn3Mo4O15.4H2O is possible in weakly acidic media. This process is favoured by increasing the concentration of initial solutions.

Characterization of soluble microbial products (SMPs) in a membrane bioreactor (MBR) treating synthetic wastewater containing pharmaceutical compounds

2016 ◽  
Vol 102 ◽  
pp. 594-606 ◽  
Author(s):  
Dongqing Zhang ◽  
Antoine Prandota Trzcinski ◽  
Chinagarn Kunacheva ◽  
David C. Stuckey ◽  
Yu Liu ◽  
...  
Keyword(s):  
Membrane Bioreactor ◽  
Pharmaceutical Compounds ◽  
Synthetic Wastewater ◽  
Soluble Microbial Products ◽  
Microbial Products

Preparation and Characterization of Au/CuxMnyOz Catalyst and Its Catalytic Performance for CO Removal

2014 ◽  
Vol 32 (7) ◽  
pp. 1220-1226
Author(s):  
Yusheng SHE ◽  
Weihua SUN ◽  
Yingying ZHAN ◽  
Xingyi LIN ◽  
Qi ZHENG
Keyword(s):  
Catalytic Performance ◽  
Co Removal

A nine-point pH titration method to determine low-concentration VFA in municipal wastewater

2011 ◽  
Vol 63 (4) ◽  
pp. 583-589 ◽  
Author(s):  
Hainan Ai ◽  
Daijun Zhang ◽  
Peili Lu ◽  
Qiang He
Keyword(s):  
Municipal Wastewater ◽  
Treatment Process ◽  
Synthetic Wastewater ◽  
Titration Method ◽  
Wastewater Treatment Process ◽  
Ph Titration ◽  
Low Concentration ◽  
Real Wastewater

Characterization of volatile fatty acid (VFA) in wastewater is significant for understanding the wastewater nature and the wastewater treatment process optimization based on the usage of Activated Sludge Models (ASMs). In this study, a nine-point pH titration method was developed for the determination of low-concentration VFA in municipal wastewater. The method was evaluated using synthetic wastewater containing VFA with the concentration of 10–50 mg/l and the possible interfering buffer systems of carbonate, phosphate and ammonium similar to those in real municipal wastewater. In addition, the further evaluation was conducted through the assay of real wastewater using chromatography as reference. The results showed that the recovery of VFA in the synthetic wastewater was 92%–102 and the coefficient of variance (CV) of reduplicate measurements 1.68%–4.72%. The changing content of the buffering substances had little effect on the accuracy of the method. Moreover, the titration method was agreed with chromatography in the determination of VFA in real municipal wastewater with R2= 0.9987 and CV =1.3-1.7. The nine-point pH titration method is capable of satisfied determination of low-concentration VFA in municipal wastewater.

Stability Of Precipitates In Thin Metal Films

1970 ◽  
Vol 28 ◽  
pp. 520-521
Author(s):  
K. R. Kinsman
Keyword(s):  
Martensite Transformation ◽  
Copper Matrix ◽  
Metal Films ◽  
Bulk Alloy ◽  
Surrounding Matrix ◽  
Transmission Electron ◽  
Precipitation Phenomena ◽  
Precipitate Composition ◽  
Prime Function

The prime function of transmission electron microscopy in the study of solid state precipitation phenomena is detailed structural characterization of the precipitate and matrix. It is fundamental that the investigator be aware of the possible structural anomalies associated with the technique. An illustration is the response to electrochemical thinning of iron-rich precipitates produced during isothermal reaction of a Cu-2.56%Fe alloy. Although the fcc(austenite) → bcc(martensite) transformation occurs at about 400°C in a bulk alloy of precipitate composition, precipitates in the copper matrix are constrained in their fee state to below 77°K, so long as the specimen remains plastically undeformed. Here it is shown that such precipitates can be induced to transform in carefully handled undeformed foils simply through reduction of the constraints offered by the surrounding matrix (Fig.1).

Synthesis and characterization of a novel nanocollector for the removal of nickel ions from synthetic wastewater using ion flotation

2020 ◽  
Vol 240 ◽  
pp. 116639 ◽  
Author(s):  
Fatemeh Sadat Hoseinian ◽  
Bahram Rezai ◽  
Elaheh Kowsari ◽  
Amutha Chinnappan ◽  
Seeram Ramakrishna
Keyword(s):  
Synthetic Wastewater ◽  
Synthesis And Characterization ◽  
Nickel Ions ◽  
Ion Flotation
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