Effects of applied anodic potential and pH on the repassivation kinetics of pure aluminium in aqueous alkaline solution

1999 ◽  
Vol 3 (2) ◽  
pp. 104-110 ◽  
Author(s):  
Sung-Mo Moon ◽  
Su-Il Pyun
Keyword(s):  
Alkaline Solution ◽  
Pure Aluminium ◽  
Aqueous Alkaline Solution ◽  
Anodic Potential ◽  
Kinetics Of ◽  
Repassivation Kinetics

Kinetics of Oxidation of Odorous Sulfur Compounds in Aqueous Alkaline Solution with H2O2

2001 ◽  
Vol 22 (10) ◽  
pp. 1137-1146 ◽  
Author(s):  
C. Feliers ◽  
L. Patria ◽  
J. Morvan ◽  
A. Laplanche
Keyword(s):  
Alkaline Solution ◽  
Sulfur Compounds ◽  
Aqueous Alkaline Solution ◽  
Kinetics Of Oxidation ◽  
Kinetics Of

Kinetics of CH3S− reaction with in situ ferrate(VI) in aqueous alkaline solution

Chemosphere ◽  
2013 ◽  
Vol 92 (10) ◽  
pp. 1301-1306 ◽  
Author(s):  
Ling Ding ◽  
Xiang-Zhong Li ◽  
Shun-Cheng Lee
Keyword(s):  
Alkaline Solution ◽  
Aqueous Alkaline Solution ◽  
Kinetics Of

Enhanced Thermal Stability of Esterified Lignin in Different Solvent Mediums

2018 ◽  
Vol 9 (1) ◽  
pp. 39-49 ◽  
Author(s):  
Sharifah Nurul Ain Syed Hashim ◽  
Sarani Zakaria ◽  
Chin Hua Chia ◽  
Sharifah Nabihah Syed Jaafar
Keyword(s):  
Thermal Stability ◽  
Alkaline Solution ◽  
Room Temperature ◽  
Hydroxyl Groups ◽  
Aqueous Alkaline Solution ◽  
Alkali Lignin ◽  
Weight Percentage ◽  
H Nmr ◽  
Ft Ir ◽  
Thermal Stability Of

In this study, soda alkali lignin from oil palm empty fruit bunch (EFB-AL) and kenaf core (KC-AL) are esterified with maleic anhydride under two different conditions, namely i) pyridine at temperature of 120°C for 3h and ii) aqueous alkaline solution at room temperature for 4h. As a result, the weight percentage gain (WPG) of the esterified EFB-AL (EFB-EL) and esterified KC-AL (KC-EL) in pyridine demonstrated a higher compared to aqueous alkaline solution. The FT-IR results of EFB-EL and KC-EL in both solvents exhibited some changes at the carbonyl and hydroxyl groups. Furthermore, the esterification process induced the carboxylic peak to appear in both alkali lignin samples. The outcome is confirmed by conducting H-NMR analysis, which demonstrated ester and carboxylic acid peaks within the spectral analysis. Finally, the TGA results showed both EFB-EL and KC-EL that are exposed to aqueous alkaline actually possessed better thermal stability and higher activation energy (Ea) compared to the esterified samples in pyridine.

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