Date of Award

2-1-2022

Thesis Type

phd

Document Type

Thesis (Restricted Access)

Divisions

eng

Department

Department of Civil Engineering

Institution

Universiti Malaya

Abstract

Water contamination from dyes and antibiotics has been a growing cause of environmental concern. Versatile adsorbents that can remove various contaminants simultaneously rather than just one type of contaminant would be beneficial in developing practical strategies to remove contaminants. Sugarcane bagasse (SB) has the potential to be a versatile, low-cost adsorbent due to its high cellulose, hemicellulose, and lignin content. Hydrothermal carbonization (HTC) is a moderate-temperature alternative to pyrolysis, producing green and cost-effective SB-based adsorbent (hydrochar). Despite this, hydrochar recognize for having poor porosity, which reduces its adsorption efficiency. The activation/modification of SB hydrochar may mitigate its drawbacks. However, difficulties in recovering powdered SB-based adsorbent from the solution during the post-adsorption process may prevent wide application. Hence, the ultimate encapsulated SB-based adsorbent was developed through four levels of sequence development ((1) SB hydrochar (HC), (2) activated HC (AHC), (3) modified AHC by NiFe bimetal organic framework (NiFeMOF) (NiFeMOF@AHCop), and the (4) double crosslinking of encapsulated NiFeMOF@AHCop in alginate bead aerogel (NiFeAHC/SA bead aerogel)) were examined. Response Surface Methodology-Central Composite Design (RSM-CCD) was employed to optimize the preparation parameters of HCop, AHCop, NiFeopAHC, and NiFeCop bead aerogel in achieving maximum dye and antibiotic removal, with Crystal Violet (CV) dye and Tetracycline (TC) as model contaminants. Characterization analyses including Field Emission Scanning Electron Microscopy (FESEM), Fourier-transform infrared spectroscopy (FTIR), Brunauer

Note

Thesis (PhD) - Faculty of Engineering, Universiti Malaya, 2022.

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15000-Farahin.pdf (192 kB)
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