Acid impregnated honeydew rind activated carbon for chromium and zinc removal

Mat Ali @ Yunus, Zalilah Murni (2017) Acid impregnated honeydew rind activated carbon for chromium and zinc removal. PhD thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

Heavy metal contamination in aqueous media and industrial discharges are among the significant environment problems, which have to be encountered due to the toxic nature and the accumulation of these metal ions in the food chains. This study has upcycled an agricultural waste namely honeydew rind (HDR) as a precursor in activated carbon (AC) adsorbent preparation using chemical activation process for Cr(III) and Zn(II) removal from synthetic wastewater. Prior to the AC production, physiochemical characteristics of the HDR were analyzed by means of XRF, FESEM, TGA and FTIR. Optimization of sulfuric acid (H2SO4) and phosphoric acid (H3PO4) of 10%-30% v/v impregnation agent generated honeydew rind impregnated activated carbon (ACS) and honeydew rind impregnated activated carbon (ACP). Optimization of carbonization temperature involved temperature of 430°C-490°C for H2SO4 and 450°C-510°C for H3PO4. Batch experiment study was conducted at constant value of 100 mL of synthetic wastewater, 125 rpm shaking rotation at ambient temperature. Brunauer-Emmet-Teller (BET), Langmuir and Freundlich were tested for isotherm adsorption while pseudo-first order and pseudo-second order were examined in kinetic behavior investigation. The column study was run under constant bed height, flow rate, inlet metal concentration of 25 cm, 16 mL/min, 1000 mL (Cr(III)); 400 mg/L (Zn(II)) respectively at ambient temperature. Boehm titration indicated that ACS and ACP are classified as acidic AC. The highest iodine number value (528.63 mg/g) and BET surface area (591.25 m^2/g) were obtained by 20% v/v ACS and carbonized at 470°C. The highest iodine number value (1174.19 mg/g) and BET surface area (1272.38 m^2/g) were achieved by 20% v/v and carbonized at 490°C. Textural analysis produced an average pore diameter of 4.46 nm for the ACS and 2.92 nm for the ACP respectively. Batch adsorption analysis resulted in an optimum condition occurring at pH 4.5, 0.1 g of ACS and ACP, 40 minute contact time and 1000mg/L for Cr(III) and pH 5.5, 0.1 g of ACS and ACP with a 40 min contact time and 400 mg/L for Zn(II). Cr(III) maximum removal was 83.49% using ACS and 88.88% using ACP respectively while Zn(II) maximum removal was 81.55% using ACS and 84.13% using ACP respectively. It was demonstrated that high metal removal was achieved due to high range of metal concentration used in the study.

Item Type:Thesis (PhD)
Subjects:T Technology > TD Environmental technology. Sanitary engineering > TD511-780 Sewage collection and disposal systems. Sewerage
ID Code:10002
Deposited By:Mr. Mohammad Shaifulrip Ithnin
Deposited On:20 May 2018 08:52
Last Modified:20 May 2018 08:52

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