Hydrated structures in the anodic layer formed on lead electrodes in H2SO4 solution

1993 ◽  
Vol 23 (12) ◽  
Author(s):  
B. Monahov ◽  
D. Pavlov
Keyword(s):  
H2so4 Solution ◽  
Anodic Layer ◽  
Lead Electrodes

Obtaining of lead (II) sulfate by polarization of bipolar lead electrodes with alternating current

2019 ◽  
Vol 96 (4) ◽  
pp. 83-91
Author(s):  
A.K. Bayeshova ◽  
◽  
A.M. Kongyratbay ◽  
F.M. Zhumabay ◽  
A. Bayeshov ◽  
...  
Keyword(s):  
Alternating Current ◽  
Lead Electrodes

scholarly journals Chemical Removal of Cu and Zn from Swine Feces before Soil Application

Agriculture ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 377
Author(s):  
Moo-Joon Shim ◽  
Seung-Mok Lee
Keyword(s):  
Reaction Time ◽  
H2so4 Solution ◽  
Optimum Conditions ◽  
Liquid Ratio ◽  
Optimal Method ◽  
Zn Concentration ◽  
Swine Feces ◽  
Removal Efficiencies ◽  
Cu And Zn ◽  
Oxalic Acids

Cu and Zn are known to be abundant in swine feces; hence, concentrations of these metals need to be lowered before swine feces are applied to land in order to prevent potential environmental problems. The main objective of this study was to develop an appropriate chemical process to remove Cu and Zn from swine feces using acid extractions. The removal efficiencies of Cu and Zn decreased in the order of H2SO4 > HNO3 > organic acids (citric and oxalic acids). Owing to the highest removal efficiencies of Cu and Zn by using H2SO4, it was selected for further elimination of Cu and Zn from swine feces. By using H2SO4, the optimal concentration, solid-to-liquid ratio, and reaction time were 2%, 1:50, and 8 h, respectively. At the optimum conditions, Cu concentration was decreased from 198 mg/kg to 40.1 mg/kg and Zn concentration from 474 mg/kg to 80.0 mg/kg, with removal rates of 79.7% and 83.1%, respectively. The low Cu removal efficiency, resulting from the strong complexation between Cu and organic matter of swine feces, was improved by the increase in the reaction time and H2SO4 solution concentrations. However, about half of the total nitrogen (TN) was also removed by using H2SO4, indicating that the swine feces treated with H2SO4 may have poor value as fertilizer. Additional studies are required to find an optimal method to maintain TN concentrations while simultaneously removing Cu and Zn.

8-hydroxyquinoline grafted triazole derivatives as corrosion inhibitors for carbon steel in H2SO4 solution: Electrochemical and theoretical studies

Ionics ◽  
2021 ◽  
Vol 27 (5) ◽  
pp. 2267-2288
Author(s):  
Z. Rouifi ◽  
F. Benhiba ◽  
M. El Faydy ◽  
T. Laabaissi ◽  
H. Oudda ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Corrosion Inhibitors ◽  
Theoretical Studies ◽  
H2so4 Solution ◽  
Triazole Derivatives
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