Water polluted by pharmaceuticals, metals, and phosphates can be hazardous to both the environment and human health. The main aim of this study is to develop low cost, green adsorbents for removal of these pollutants from aqueous solution as a low cost alternative to activated carbon. Biochar was produced from the fast pyrolysis of Douglas fir. Magnetic biochar was prepared by magnetite (Fe3O4) precipitation onto the biochar’s surface from an aqueous Fe3+/Fe2+ solution upon NaOH treatment. Both Douglas fir and magnetic Douglas fir biochars have high uptake and adsorption capacity. Chapter I provides an overview of different biochar production techniques and modification methods. Chapter II is a study of the aqueous adsorption of pharmaceutical products, 4-nitroaniline (4NA), salicylic acid (SA), benzoic acid (BA) and phthalic acid (PA) using Douglas fir and magnetic Douglas fir biochar. The surface chemistry and composition of the magnetic biochar were examined by SEM, SEM-EDX, TEM, PZC, XPS, XRD, elemental analysis, and surface area measurements. Chapter III describes the removal of lead and cadmium using both magnetic and nonmagnetic Douglas fir biochar and Chapter IV describes the removal of phosphate from waste water. In Chapter V, this low cost adsorbent (magnetic Douglas fir biochar) was introduced into an undergraduate laboratory to expose students to water quality issues and methods of contaminant removal enhancing their understanding of these important environmental issues. This experiment introduces new and interesting approaches to water purification as well as deepens the student’s understanding of present environmental concerns regarding pharmaceutical contaminants in wastewater.
| Identifer | oai:union.ndltd.org:MSSTATE/oai:scholarsjunction.msstate.edu:td-2571 |
| Date | 06 May 2017 |
| Creators | Karunanayake, UPA Gayanthi Akila |
| Publisher | Scholars Junction |
| Source Sets | Mississippi State University |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | Theses and Dissertations |
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