Analytical Electrochemistry in Textiles

P Westbroek, G Priniotakis, P Kiekens

• Publisher: Woodhead Publishing
• Year: 2005
• Print ISBN: 9781855739192
• eBook ISBN: 9781845690878
• Topic: Tecnología e ingeniería
• Subtopic: Química analítica

Electrochemistry is the study of chemical reactions with an exchange of electrons, and of the chemical phenomena that are caused by the action of applied currents and voltages. Analytical electrochemistry in textiles provides an overview of the synergy between electrochemistry and textiles, and the possibilities and innovative character of electrochemistry for textiles.Analytical electrochemistry in textiles is divided into four parts. In the first part an overview is given of the theory of electrochemistry as well as of practical considerations. The second part contains chapters in which the development of sensors is described for the optimisation and automation of textile finishing processes. In the third part the fundamentals of textile electrodes, used in a wide variety of applications, are summarised, as well as offering a developed study of a quality control method. Finally, the fourth part of the book is related to the functionalisation of fibres through chemical and electrochemical modification and some applications are given for these types of textile related electrodes.Written so that both non-electrochemists and non-textile specialists can understand it, Analytical electrochemistry in textiles is an important guide for textile, chemist and material science academics. It will also prove of great benefit for textile manufacturers, processors, dyers, colourists and finishers. - Provides an overview of the synergy between electrochemistry and textiles - An invaluable reference tool for textile, chemist and material science academics as well as textile manufacturers, processors, dyers, colourists and finishers

II

Electrochemistry in textile finishing

Outline

Chapter 3: Probes for pH measurement and simultaneous cellulose removal and bleaching of textiles with enzymes

Chapter 4: Electrochemical behaviour of hydrogen peroxide oxidation: kinetics and mechanisms

Chapter 5: Amperometric detection of hydrogen peroxide in bleaching and washing processes

Chapter 6: Simultaneous detection of indigo and sodium dithionite for control of dyeing processes

Chapter 7: Advantages of electrocatalytic reactions in textile applications: example – electrocatalytic oxidation of sodium dithionite at a phthalocyanine and porphyrin cobalt(II)-modified gold electrode

3

Probes for pH measurement and simultaneous cellulose removal and bleaching of textiles with enzymes

P. WESTBROEK and P. KIEKENS

Publisher Summary

This chapter examines various probes for pH measurement such as ion-selective and glass-membrane electrodes as well as simultaneous cellulose removal and bleaching of textiles with enzymes. Ion-selective electrodes belong to the group of potentiometric methods. Many electrode systems, partly well-known, partly in development and under investigation, show a Nernstian relationship between the measured electrode potential and the activity of a species in solution. Important conditions to be fulfilled for the development of ion-selective electrodes are the affinity of a membrane surface for a typical ion or molecule and minimum ion conductivity over the membrane. If possible, but not necessarily, these conditions should be fulfilled at room temperature. The chapter describes a method to remove simultaneously cellulose and bleach fiber products in the same bath with an acidic medium. An account is also given of a sensor system for measuring and controlling the hydrogen peroxide concentration.

3.1 Introduction

This chapter examines various probes for pH measurement such as ion-selective and glass-membrane electrodes as well as simultaneous cellulose removal and bleaching of textiles with enzymes.

3.2 Ion-selective electrodes

3.2.1 What is an ion-selective electrode?

Ion-selective electrodes belong to the group of potentiometric methods. Many electrode systems, partly well known, partly in development and under investigation, show a Nernstian relationship between the measured electrode potential and the activity of a species in solution. Important conditions to be fulfilled for the development of ion-selective electrodes are the affinity of a membrane surface for a typical ion or molecule and a minimum ion conductivity over the membrane. If possible, but not necessarily, these conditions should be fulfilled at room temperature.

In practice (Fig. 3.1), the potential difference, ΔE, is measured over a membrane:

3.1 Scheme of the potential difference over an ion-selective membrane, with both surface sides in contact with a solution containing chemical species.

$\Delta E=E_2-E_1$ [3.1]

[3.1]

where E₂ is the actual potential of the interface solution 2 (membrane surface 2), and E₁ is the potential of the interface solution 1 (membrane surface 1). This difference is related...

Table of contents

• Cover image
• Title page
• Table of Contents
• Related titles from Woodhead’s textile technology list
• Copyright
• Author contact details
• Preface
• I: Theoretical considerations
• II: Electrochemistry in textile finishing
• III: Textile electrodes
• IV: Modified fibres and their applications
• Index