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Optimization of Activated Carbon Preparation From Corncob Wastewater Treatment

Optimization of Activated Carbon Preparation From Corncob Wastewater Treatment

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DEDICATION

This research material, titled “Optimization of Activated Carbon Preparation From Corncob Wastewater Treatment” is dedicated to God for His boundless grace and guidance. It is also a tribute to all computer enthusiasts whose contributions made my research journey smoother and enriched my documentation process, making the experience truly fulfilling.



ACKNOWLEDGEMENT

I am profoundly grateful to everyone who contributed to the successful completion of this project. I am especially grateful to my Supervisor (Name), the Head of Department (Name), and the Lecturers in the Department of Chemical Engineering for their invaluable guidance and support. I also acknowledge the contributions of authors and scholars whose works on Optimization of Activated Carbon Preparation From Corncob Wastewater Treatment provided essential insights. Special thanks go to my study area (and any funding organizations, if applicable) for their financial assistance. I am equally thankful to stakeholders, including mentors, teachers, and colleagues, for their encouragement and support. Finally, I deeply appreciate my family and friends for their patience and unwavering support throughout this journey. Your contributions have been instrumental in making this research a reality.



ABSTRACT

Corncob Activated Carbon (AC) was produced via chemical activation with phosphoric acid (H3PO4) for the hydrolysis step and potassium hydroxide (KOH) for the impregnation step. In this work, optimization and development of the model equations for the preparation conditions of AC, Design Expert 6.0.6 Stat-Ease, Inc USA software was used. For the optimization of the AC preparation conditions, a Central Composite Design (CCD) was used to investigate the effect of independent variables on the yield and adsorption capacity of the activated carbon samples. The independent variables used in this work were, phosphoric acid concentration, potassium hydroxide concentration, activation temperature (oC) and activation time (minute).

Response Surface Methodology (RSM) technique was used to optimize the preparation conditions (H3PO4, KOH, temperature and time); with percentage yields of hydrolysate and activated carbon and adsorption capacity of AC as the targeted responses. The optimal conditions for the preparation of AC using CCD software were 358.15 oC, 116.90 minutes, 0.29 mg/l H3PO4, 0.09 mg/l KOH. This set of conditions gave hydrolysate yield of 76.9339 %, while activated carbon yield and Methylene Blue (MB) adsorption capacity were 21.84 % and 1.98 mg/g respectively. The specific surface area of the AC using Sear's method was 314.2 m2/g. Analysis of Variance (ANOVA) for hydrolysate yield, AC yield and adsorption capacity showed the developed models equations were significant.

The experimental and predicted values of the hydrolysate yield, AC yield and adsorption capacity of adsorbent on adsorbate MB were in close agreement and the correlation coefficients R2-values of 0.9688, 0.9358 and 0.9134. The surface areas of selected ACs were 259.8 m2/g (AC8), 215 m2/g (AC9) and 314.2 m2/g (AC14) gave adsorption capacities of 1.92 gm/g, 1.97 mg/g and 1.98 mg/g of MBrespectively. The Fourier Transform Infra-Red (FTIR) analysis of the AC samples produced showed the presence of O-H, C-H, C-Br, N-H, C-C, C-N, C=C and C=C functional groups which aid in adsorbing adsorbate onto the adsorbent. Adsorption isotherm data were used to model the following Langmuir and Freundlich isotherms; the adsorption of Chromium ions on the selected AC produced was predicted by Langmuir and Freundlich isotherm models with R2 value of 0.9974 and 0.7691 respectively. The percentage chromium removal increases with increase in adsorbent dosage. The activated carbon samples produced can be effectively used for wastewater treatment.


Optimization of Activated Carbon Preparation From Corncob Wastewater Treatment

CHAPTER ONE

1.0 Introduction

1.1 Background of Study

Activated Carbon (AC) is a versatile derivative of biomass predominantly amorphous (crystalline) solid that has extra ordinary large internal surface area and pore volume (Jamaludin, 2010). The unique structure of AC gives rise to its application ranges from liquid to gas phase because of their adsorptive properties.

Industrial ACs can be produced from any cheap material with a high carbon content, low inorganics as precursors such as coal, wood, coconut shell, corn cob, almond shells, peach stones, grape seeds, apricot stones, cherry stones, olive stones, peanut hull, nut shells, rice husk, oil palm shells, sugar cane bagasse (Tsai et al., 1997, and 2001; Jamaludin, 2010;

Diya'udeen et al., 2011). Palm shell, rattan, mango stem peel, and corn cob (Mohd et al., 2011); canarium schevein furthii nutshell (and Ajayi and Olawale, 2009), groundnut shells, Palm Kernel shells, coconut shells, bamboo, wood chips, corn cob, seeds and saw dusts (Oloworise, 2006).

AC has been the most popular and widely used adsorbent in liquid and gas treatment throughout the world. Charcoal been the pioneer of AC has been recognized as the oldest adsorbent known in waste water treatment.

AC is produced by a process consisting of raw material dehydration and carbonization followed by activation.

…

CHAPTER TWO

2.0 Literature Review

2.1 Introduction

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