Kinetic and Thermodynamic Studies of the Adsorption of Heavy Metals Using Activated Carbon

CHAPTER ONE : INTRODUCTION

1.1 Background to the Study

Heavy metal pollution remains a serious environmental concern due to the toxic and non-biodegradable nature of metals such as lead, cadmium, and chromium. These metals enter water systems through industrial discharges, mining activities, and agricultural runoff. Once present in the environment, they accumulate in living organisms and pose severe health risks, including organ damage and neurological disorders (Fu & Wang, 2011).
Adsorption is one of the most effective techniques for removing heavy metals from contaminated water. Activated carbon, in particular, is widely used because of its high surface area, porosity, and ability to bind a wide range of pollutants. However, the efficiency of adsorption depends on several factors such as contact time, temperature, concentration, and pH (Babel & Kurniawan, 2003).
By conducting kinetic and thermodynamic studies, researchers can understand the mechanism of metal adsorption and determine whether the process is spontaneous, endothermic, or exothermic. This knowledge is essential for designing efficient water treatment systems and optimizing environmental remediation technologies.

1.2 Statement of the Problem

Many industrial wastewater treatment systems lack proper optimization of adsorption processes. Without a clear understanding of kinetics and thermodynamics, treatment systems may operate inefficiently, wasting energy and materials.

1.3 Objectives of the Study

1. To study the adsorption behavior of selected heavy metals on activated carbon.

2. To evaluate the kinetics and thermodynamic parameters of the adsorption process.

3. To identify the optimal conditions for maximum metal removal efficiency.

1.4 Significance of the Study

This research will enhance understanding of adsorption science and guide the design of cost-effective, eco-friendly water purification systems. It will also support industrial and environmental engineers in developing better treatment technologies.

1.5 Scope of the Study

The study will focus on a limited number of heavy metals and use laboratory-synthesized or commercial activated carbon. Experiments will evaluate temperature, pH, and contact time effects on adsorption performance.