Modification of surface, physical and chemical properties of activated carbons for water purification

Project Abstract

Activated carbons are widely used in water purification processes due to their high surface area and adsorption capacity. However, their efficiency can be enhanced by modifying their surface, physical, and chemical properties. In this study, various modification techniques such as chemical treatment, physical activation, and thermal treatment were explored to improve the performance of activated carbons in removing contaminants from water. Chemical treatments involve the introduction of functional groups onto the surface of activated carbons to increase their adsorption capacity for specific contaminants. This can be achieved through processes like oxidation, impregnation, or grafting of chemicals onto the carbon surface. Physical activation methods, such as steam or CO2 activation, can increase the porosity and surface area of activated carbons, leading to improved adsorption efficiency. Thermal treatments involve subjecting activated carbons to high temperatures in an inert atmosphere to remove volatile compounds and enhance their stability and adsorption properties. This process can also help in the removal of surface functional groups and impurities, resulting in a cleaner and more efficient adsorbent. The modification of activated carbons can also involve the incorporation of nanoparticles or other materials to create composites with enhanced adsorption capabilities. These composites can target specific contaminants in water and provide synergistic effects that improve the overall water purification process. Understanding the effects of surface modification on the physical and chemical properties of activated carbons is crucial for optimizing their performance in water treatment applications. Characterization techniques such as BET surface area analysis, SEM imaging, FTIR spectroscopy, and X-ray diffraction can be used to evaluate the changes in the structure and composition of modified activated carbons. Overall, the modification of surface, physical, and chemical properties of activated carbons plays a significant role in enhancing their effectiveness as water purification agents. By tailoring the properties of activated carbons to specific contaminants and water quality requirements, it is possible to develop more efficient and sustainable water treatment solutions.

Project Overview

<p> </p><p><strong>INTRODUCTION</strong></p><p><strong>1.1 ORIGIN AND NATURE OF ACTIVATED CARBON</strong></p><p>Carbon is the fifteenth most abundant element in the earth’s crust and the fourth most abundant element in the universe by mass after hydrogen, helium and oxygen. Scientists, industries, and consumers use different forms of carbon and carbon containing compounds in many ways such as activated carbon or carbon in its active form which can be used to purify water, among others.Activated carbon is a form of carbon that has been produced to make it extremely porous and thus have a very large surface area available for adsorption or chemical reactions.It can be defined as a microcrystalline non-graphitic amorphous form of carbon which has been processed to develop a high internal porosity due to its network of inter-connecting pores.The history of activated carbon is dated since the fifteenth century, during the time of Columbus when sailors used to blacken the inside of wooden water barrels with fire, since they observed that the water would stay fresh much longer. It is likely that people at that time proceeded by intuition only without having anyCHE/2007/063 14insight into the mechanism of the effect. The mechanism was recognized beginning from the eighteenth century.In 1862, Lipscombe prepared a carbon material for purifying portable water. This development paved the way for the commercial application of activated carbon first for portable water and then in waste water sector.</p><p><strong>1.2 METHODS OF MANUFACTURE OF ACTIVATED CARBON</strong></p><p>The methods employed in the industrial manufacture of activated carbons are numerous but consist of three main methods namely; Chemical activation, Steam activation and thermal processing techniques.The raw materials or precursors used in the manufacture of activated carbon are as follows; Softwood, coconut shell, lignite, hardwood, grain and agro products, bituminous coal, anthracite, etc.Chemical activation is generally used for the production of activated carbon from sawdust, wood or peat and uses chemicals for activation. Chemical activation technique involves mixing an inorganic chemical compound with the carbonaceous raw materials and the most widely used activating agents are Phosphoric acid and Zinc Chloride.CHE/2007/063 15Steam activation technique is generally used for coal-based, coconut shell and grain-based activated carbons and uses gases, vapors or a mixture of both for its activation.Thermal processing technique is a separation process that removes unwanted materials from the carbonaceous precursor used under varying heat applications. This technique is at a lower cost compared to the two techniques above and meets all environmental standards, while others need expensive solutions to achieve the same results.</p><p><strong>1.3 NEED FOR PRESENT INVESTIGATION</strong></p><p>The need for present investigation of this material cannot be over emphasized. This is as a result of the pressing need for treatment of waste water emanating from domestic and industrial concerns.Activated carbon plays an important role in the purification of fluids (water), including vegetable oils used in domestic cooking and as a precursor in industrial manufacture of food products. The slow pace of technological development in the country has resulted to the expenditure of the nation’s resources on importation of activated carbons to meet the demand for local chemical and process industries, as well as the demand for municipal and industrial water treatment plants.CHE/2007/063 16Rapid industrialization, together with the increase in modern methods of agriculture and the increase in population, has contributed to the pollution of the ecosystem. Most of the pollutants are toxic to living organisms. It is therefore imperative that waste water has to be treated to remove the toxic materials before disposal to the environment. Most methods of treating water have some inherent shortfalls. Activated carbon treatment was therefore developed because of its effectiveness in pollutants removal, especially in water purification.</p><p><strong>1.4 OBJECTIVES AND SCOPE OF THE STUDY</strong></p><p>The primary objectives and scope of the present investigation include the following:i. Acquisition of the different types of activated carbons available to the nation’s chemical industry.ii. Modification of the surface physical and chemical properties of the carbon material, for their use in liquid phase applications.iii. Determination of the physical properties of the as-received and modified activated carbon materials.iv. Testing the adsorption capacity of the carbon materials in adsorption processes.v. Evaluation of the fractional surface coverage for each carbon material.CHE/2007/063 17vi. Proposal of a scheme for the optimal modification of activated carbon material for optimal application in liquid phase adsorption.CHE/2007/063 18</p> <br><p></p>