Surface modification of porous carbon material for electro-sorption application

Name: Patsara Vasukunasin

LCSH: Kasetsart University -- Theses. M.Eng. (Sustainable Energy and Resources Engineering) 2022

Classification :.LCCS: TD442.5

LCSH: Kasetsart University. -- Faculty of Engineering -- Theses

LCSH: Membranes (Technology)

LCSH: Water -- Purification

LCSH: Porous materials

LCSH: Carbon

LCSH: Bituminous materials

Abstract: Capacitive deionization (CDI) as an alternative deionization technology has attracted wide attention among the conventional technologies such as reverse osmosis, ion exchange resin, and adsorptions. Its advantages are considered in terms of a cost-effective and environmentally friendly process. CDI is based on an electrochemically reverse adsorption and desorption process occurring at the interfacial of electrode and electrolyte solution. A pair of electrodes is induced by an electrical voltage allowing charged ions adsorption and/or desorption by electrostatic force attraction. Thus, the CDI performances mainly depended on nature of electrode materials, typically carbon materials with high surface area. This study aims to prepare Ag particle coated bituminous activated carbon (BITU) with a facial impregnation method for utilization as CDI electrode materials. The material characterizations were determined in terms of physicochemical properties, suggesting 1) a successful incorporation of Ag metal particle on BITU surface via Ag-O bonds with a high amount of Ag with 24-25 wt%, 2) an enhanced surface wettability of Ag coated BITU, and 3) a reduced specific surface area due to pore blocking of Ag particle on porous structure of BITU. The electrochemical property was studied in various sodium salt solutions (NaCl, NaNO3, and NaF), exhibiting a different redox peak potential depended on each salt solution. Moreover, Ag coated BITU (BITU-4H) electrode had a higher conductivity as compared to BITU without Ag particles (BITU-0). The utilization of BITU-4H electrode for CDI was investigated under single salt and mixed salt solution experiments. A significant improvement of nitrate adsorption capacity was detected for asymmetrical electrode (BITU-0 and BITU-4H). Under competitive anion environment (Cland NO3 - ), a great selectivity of nitrate over chloride ion (SNO3/Cl) of asymmetrical electrode was demonstrated in a wide range of concentration, particularly in a high amount of chloride ions. Finally, this study demonstrated that the development of Ag coated BITU could be a potential carbon electrode material for CDI application to remove nitrate ion toward contaminant brackish water in nature.

Kasetsart University. Office of the University Library

Address: Bangkok

Email: tdckulib@ku.ac.th

Name: Peerakarn Banjerdkij

Role: Thesis Advisor

Name: Chaleawlert-Umpon

Role: Thesis CO-Advisor

Created: 2022

Modified: 2025-07-23

Issued: 2025-07-23

วิทยานิพนธ์/Thesis

application/pdf

URL: https://www.lib.ku.ac.th/KUthesis/2565/patsara-vas-all.pdf

CallNumber: TD442.5 .P38

eng

DegreeName: Master of Engineering

Level: Master's Degree

Descipline: Sustainable Energy and Resources Engineering

Grantor: Kasetsart University

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