Electrochemical Reduction Of Nitrates And Nitrites Using Copper Modified Platinum Electrode

Elektropenurunan nitrat dan nitrit dalam kajian ini dijalankan dengan menggunakan elektrod platinum terubahsuai dengan kuprum di dalam larutan 0.05 M KCl melalui teknik voltammetri kitaran. Satu perbandingan telah dilakukan dengan menggunakan pelbagai elektrod kerja seperti kuprum, elektrod kuprum t...

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Main Author:	Ratnam, Sree Amertharaj
Format:	Thesis
Language:	English
Published:	2016
Subjects:	QD1-999 Chemistry
Online Access:	http://eprints.usm.my/32287/1/SREE_AMERTHARAJ_RATNAM_24%28NN%29.pdf
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spelling	my-usm-ep.322872019-04-12T05:25:14Z Electrochemical Reduction Of Nitrates And Nitrites Using Copper Modified Platinum Electrode 2016-09 Ratnam, Sree Amertharaj QD1-999 Chemistry Elektropenurunan nitrat dan nitrit dalam kajian ini dijalankan dengan menggunakan elektrod platinum terubahsuai dengan kuprum di dalam larutan 0.05 M KCl melalui teknik voltammetri kitaran. Satu perbandingan telah dilakukan dengan menggunakan pelbagai elektrod kerja seperti kuprum, elektrod kuprum terubahsuai dengan kuprum (Cu-Cu) dan elektrod pensil grafit terubahsuai kuprum (PG-Cu). Proses permendapan zarah kuprum ditetapkan sebanyak 30 kitaran/ 18 saat untuk semua elektrod yang diubahsuai dengan kuprum bagi mendapatkan nisbah yang terbaik. Luas permukaan sebenar bagi elektrod Pt, Cu, Cu-Cu, PG-Cu dan Pt-Cu dianggarkan sebanyak 1.747 cm2, 0.814 cm2, 0.988 cm2, 1.146 cm2 and 2.259 cm2. Aktiviti dan pemilihan elektropenurunan nitrat dan nitrit adalah lebih memuaskan jika menggunakan elektrod Pt-Cu. Plot ip vs. ν1/2 menunjukkan bahawa elektron yang dipindahkan dalam langkah penentu kadar tindakbalas adalah 1.51, 1.66, 1.88 dan 2.05 melalui elektrod Cu, Cu-Cu, PG-Cu dan Pt-Cu yang menunjukkan penurunan kepada nitrit. The electroreduction of nitrates and nitrites were carried out in this study using a copper modified platinum (Pt-Cu) electrode in the presence of 0.05 M KCl solution using cyclic voltammetry. Comparison was carried out using various working electrodes such as Cu, copper modified copper electrode (Cu-Cu) and copper modified pencil graphite electrode (PG-Cu). For the copper modified electrodes, the deposition of the copper particles was maintained at 30 cycles/ 18 seconds as the best ratio. The real surface area Pt, Cu, Cu-Cu, PG-Cu and Pt-Cu electrodes were estimated to be 1.747 cm2, 0.814 cm2, 0.988 cm2, 1.146 cm2 and 2.259 cm2 respectively. The activity and selectivity for electroreduction of both nitrates and nitrites were better at the Pt-Cu electrode. The plot ipvsν1/2 shows that the electrons transferred in the rate determining step was 1.51, 1.66, 1.88 and 2.05 on the Cu, Cu-Cu, PG-Cu and Pt-Cu respectively indicating the electroreduction of nitrate to nitrite. At more negative overpotentials, the number of electrons transferred was approximately 5.15, 5.26, 5.35 and 6 on the Cu, Cu-Cu, PG-Cu and Pt-Cu electrodes respectively, corresponding to the production of ammonia. 2016-09 Thesis http://eprints.usm.my/32287/ http://eprints.usm.my/32287/1/SREE_AMERTHARAJ_RATNAM_24%28NN%29.pdf application/pdf en public masters Universiti Sains Malaysia Pusat Pengajian Sains Kimia (School of Chemical Sciences)
institution	Universiti Sains Malaysia
collection	USM Institutional Repository
language	English
topic	QD1-999 Chemistry
spellingShingle	QD1-999 Chemistry Ratnam, Sree Amertharaj Electrochemical Reduction Of Nitrates And Nitrites Using Copper Modified Platinum Electrode
description	Elektropenurunan nitrat dan nitrit dalam kajian ini dijalankan dengan menggunakan elektrod platinum terubahsuai dengan kuprum di dalam larutan 0.05 M KCl melalui teknik voltammetri kitaran. Satu perbandingan telah dilakukan dengan menggunakan pelbagai elektrod kerja seperti kuprum, elektrod kuprum terubahsuai dengan kuprum (Cu-Cu) dan elektrod pensil grafit terubahsuai kuprum (PG-Cu). Proses permendapan zarah kuprum ditetapkan sebanyak 30 kitaran/ 18 saat untuk semua elektrod yang diubahsuai dengan kuprum bagi mendapatkan nisbah yang terbaik. Luas permukaan sebenar bagi elektrod Pt, Cu, Cu-Cu, PG-Cu dan Pt-Cu dianggarkan sebanyak 1.747 cm2, 0.814 cm2, 0.988 cm2, 1.146 cm2 and 2.259 cm2. Aktiviti dan pemilihan elektropenurunan nitrat dan nitrit adalah lebih memuaskan jika menggunakan elektrod Pt-Cu. Plot ip vs. ν1/2 menunjukkan bahawa elektron yang dipindahkan dalam langkah penentu kadar tindakbalas adalah 1.51, 1.66, 1.88 dan 2.05 melalui elektrod Cu, Cu-Cu, PG-Cu dan Pt-Cu yang menunjukkan penurunan kepada nitrit. The electroreduction of nitrates and nitrites were carried out in this study using a copper modified platinum (Pt-Cu) electrode in the presence of 0.05 M KCl solution using cyclic voltammetry. Comparison was carried out using various working electrodes such as Cu, copper modified copper electrode (Cu-Cu) and copper modified pencil graphite electrode (PG-Cu). For the copper modified electrodes, the deposition of the copper particles was maintained at 30 cycles/ 18 seconds as the best ratio. The real surface area Pt, Cu, Cu-Cu, PG-Cu and Pt-Cu electrodes were estimated to be 1.747 cm2, 0.814 cm2, 0.988 cm2, 1.146 cm2 and 2.259 cm2 respectively. The activity and selectivity for electroreduction of both nitrates and nitrites were better at the Pt-Cu electrode. The plot ipvsν1/2 shows that the electrons transferred in the rate determining step was 1.51, 1.66, 1.88 and 2.05 on the Cu, Cu-Cu, PG-Cu and Pt-Cu respectively indicating the electroreduction of nitrate to nitrite. At more negative overpotentials, the number of electrons transferred was approximately 5.15, 5.26, 5.35 and 6 on the Cu, Cu-Cu, PG-Cu and Pt-Cu electrodes respectively, corresponding to the production of ammonia.
format	Thesis
qualification_level	Master's degree
author	Ratnam, Sree Amertharaj
author_facet	Ratnam, Sree Amertharaj
author_sort	Ratnam, Sree Amertharaj
title	Electrochemical Reduction Of Nitrates And Nitrites Using Copper Modified Platinum Electrode
title_short	Electrochemical Reduction Of Nitrates And Nitrites Using Copper Modified Platinum Electrode
title_full	Electrochemical Reduction Of Nitrates And Nitrites Using Copper Modified Platinum Electrode
title_fullStr	Electrochemical Reduction Of Nitrates And Nitrites Using Copper Modified Platinum Electrode
title_full_unstemmed	Electrochemical Reduction Of Nitrates And Nitrites Using Copper Modified Platinum Electrode
title_sort	electrochemical reduction of nitrates and nitrites using copper modified platinum electrode
granting_institution	Universiti Sains Malaysia
granting_department	Pusat Pengajian Sains Kimia (School of Chemical Sciences)
publishDate	2016
url	http://eprints.usm.my/32287/1/SREE_AMERTHARAJ_RATNAM_24%28NN%29.pdf
_version_	1747820558895022080

Electrochemical Reduction Of Nitrates And Nitrites Using Copper Modified Platinum Electrode

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