The Inhibitive Action of Aniline on the Autoxidation of Sodium Sulfite in Acidic Medium

Sharma, Arun Kumar

doi:10.15406/japlr.2017.04.00091

JAPLR

2017

DOI: 10.15406/japlr.2017.04.00091

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The Inhibitive Action of Aniline on the Autoxidation of Sodium Sulfite in Acidic Medium

Arun Kumar Sharma¹

Abstract: The kinetics of atmospheric autoxidation of S (IV) by Ag(I) at pH 4.02-5.25 has been studied. The aqueous phase autoxidation of S (IV) is the major factor responsible for acidification of atmospheric aqueous system. The role of Aniline act as an inhibitor of Ag(I) catalysed autoxidation of S(IV) in acidic medium has been identified, and based on the observed results following rate law given and a free radical mechanism has been proposed.( )

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Copper Catalyzed Autoxidation of Sulphur Dioxide and Inhibition by Methanoic Acid

Prasad

2020

CPC

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Background:: Today, acid rain problem is one of the serious global problems to the environment in which pH of the rain water decreases, causing harmful effect to nature, buildings, monuments, vegetation and human being as well. Therefore, the objective of the paper to find out some organic inhibitors present in the atmosphere that inhibited the acid rain. Objective:: In this paper, we studied the chemistry of Cu (II)-methanoic acid-S(IV)-O2 in acetate buffered medium by earlier reported methods in literature. Gravimetric analysis was carried out to find the end product and confirmed that it was sulphate with 98 % recovery. Methods:: Experiments were carried out at 303 ≤ T/K ≤ 313, 4.0 ≤ pH ≤ 5.35, 1.0×10−3 mol/dm3 ≤ S(IV) ≤ 10.0×10−3 mol/dm3, 5×10−6 mol/dm3 ≤ [Cu(II)] ≤ 2.5×10−5 mol/dm3, 6×10−6 mol/dm3≤[methanoic acid]≤7×10-4 mol/dm3. The value of apparent activation energy and inhibition parameter B was calculated in the presence of methanoic acid found as 29.07 kJ mol-1and 3.18 x 103 mol dm-3, respectively. The thermodynamic parameters were found as frequency factor (1.59 x 10-6s-1), entropy (-358.92 J K-1 mol-1), enthalpy (20.97 k J mol-1), and Gibbs free energy (172.83k J mol-1), respectively. Results:: We observed that methanoic acid acts as an inhibitor in copper catalyzed autoxidation of SO2 in acidic medium. Therefore, on the basis of the observed results a free radical mechanism has been identified. The results are useful for modeling rain water acidity and therefore a great use of meteorology and atmospheric chemistry. This study is important in understanding the mechanism of the oxidation of S(IV) by O2. Conclusion:: This study suggests that since organic inhibitors are found in the atmosphere, their concentrations and their influence on the oxidation of aqueous SO2 should be taken into account. The intervention of methanoic acid in the autoxidation of aqueous SO2 plays a role in deciding the fate of both methanoic acid and SO2. The influence of inhibitors may be used to calculate the lifetime of SO2, Methanoic acid has high values of kinh and, therefore, it would be degraded by sulfate radical anions in atmospheric waters.

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Copper Catalyzed Autoxidation of Sulphur Dioxide and Inhibition by Methanoic Acid

Prasad

2020

CPC

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The Inhibitive Action of Aniline on the Autoxidation of Sodium Sulfite in Acidic Medium

Cited by 1 publication

References 23 publications

Copper Catalyzed Autoxidation of Sulphur Dioxide and Inhibition by Methanoic Acid

Copper Catalyzed Autoxidation of Sulphur Dioxide and Inhibition by Methanoic Acid

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