Removal of dyestuff from aqueous solution using layered double hydroxide / Siti Mariam Sumari

Among the various techniques for colour removal, adsorption is the most efficient and practically viable. However due to the relatively high production cost and difficulty in regeneration of activated carbon conventionally used as adsorbent for dye removal, there is a need to find alternatives. Cons...

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Main Author:	Sumari, Siti Mariam
Format:	Book Section
Language:	English
Published:	Institute of Graduate Studies, UiTM 2016
Subjects:	Malaysia
Online Access:	http://ir.uitm.edu.my/id/eprint/20112/ http://ir.uitm.edu.my/id/eprint/20112/1/ABS_SITI%20MARIAM%20SUMARI%20TDRA%20VOL%2010%20IGS%2016.pdf

id	uitm-20112
recordtype	eprints
spelling	uitm-201122018-06-11T04:07:40Z http://ir.uitm.edu.my/id/eprint/20112/ Removal of dyestuff from aqueous solution using layered double hydroxide / Siti Mariam Sumari Sumari, Siti Mariam Malaysia Among the various techniques for colour removal, adsorption is the most efficient and practically viable. However due to the relatively high production cost and difficulty in regeneration of activated carbon conventionally used as adsorbent for dye removal, there is a need to find alternatives. Consequently, layered double hydroxide (LDH) was proposed as an alternative adsorbent. MgAl-NO3-layered double hydroxide (LDH) (molar ratio Mg/Al: 4:1) was synthesised using coprecipitation method followed by hydrothermal treatment at 70 oC. Its calcined form (CLDH) was obtained at calcination temperature of 500 oC. The physicochemical characteristics of adsorbents, LDH and CLDH were determined prior to adsorption study involving anionic dyes (Acid Blue 29, Reactive Black 5, Reactive Orange 16 and Reactive Red 120 and a cationic dye Methylene Blue. Physical characterization using XRay diffraction, FTIR spectroscopy, scanning electron microscopy (SEM) confirmed the identity of LDH and CLDH pertaining to d003 position, its functional groups and morphological features. Adsorption of anionic dyes were influenced by pH, adsorbent dosage, contact time, initial dye concentration and temperature. High percentage removal for anionic dyes was favoured at pH < pHpzc (9.3-10) indicating strong electrostatic interaction between negatively charged dyes and positively-charged surface of adsorbent. Complete decolorization of anionic dyes was achievable for 25 mg/L concentration within 3 hrs at 0.2 g/L LDH dosage, but higher dye concentration needed longer equilibrium time within 24 hours. Analysis of kinetic data using pseudo-first order (PFO), pseudo-second order (PSO) and intra-particle diffusion kinetic models revealed that PSO mechanism was predominant and the overall rate of dye adsorption process appeared to be controlled by more than one step…. Institute of Graduate Studies, UiTM 2016 Book Section PeerReviewed text en http://ir.uitm.edu.my/id/eprint/20112/1/ABS_SITI%20MARIAM%20SUMARI%20TDRA%20VOL%2010%20IGS%2016.pdf Sumari, Siti Mariam (2016) Removal of dyestuff from aqueous solution using layered double hydroxide / Siti Mariam Sumari. In: The Doctoral Research Abstracts. IGS Biannual Publication, 10 (10). Institute of Graduate Studies, UiTM, Shah Alam.
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Teknologi MARA
building	UiTM Institutional Repository
collection	Online Access
language	English
topic	Malaysia
spellingShingle	Malaysia Sumari, Siti Mariam Removal of dyestuff from aqueous solution using layered double hydroxide / Siti Mariam Sumari
description	Among the various techniques for colour removal, adsorption is the most efficient and practically viable. However due to the relatively high production cost and difficulty in regeneration of activated carbon conventionally used as adsorbent for dye removal, there is a need to find alternatives. Consequently, layered double hydroxide (LDH) was proposed as an alternative adsorbent. MgAl-NO3-layered double hydroxide (LDH) (molar ratio Mg/Al: 4:1) was synthesised using coprecipitation method followed by hydrothermal treatment at 70 oC. Its calcined form (CLDH) was obtained at calcination temperature of 500 oC. The physicochemical characteristics of adsorbents, LDH and CLDH were determined prior to adsorption study involving anionic dyes (Acid Blue 29, Reactive Black 5, Reactive Orange 16 and Reactive Red 120 and a cationic dye Methylene Blue. Physical characterization using XRay diffraction, FTIR spectroscopy, scanning electron microscopy (SEM) confirmed the identity of LDH and CLDH pertaining to d003 position, its functional groups and morphological features. Adsorption of anionic dyes were influenced by pH, adsorbent dosage, contact time, initial dye concentration and temperature. High percentage removal for anionic dyes was favoured at pH < pHpzc (9.3-10) indicating strong electrostatic interaction between negatively charged dyes and positively-charged surface of adsorbent. Complete decolorization of anionic dyes was achievable for 25 mg/L concentration within 3 hrs at 0.2 g/L LDH dosage, but higher dye concentration needed longer equilibrium time within 24 hours. Analysis of kinetic data using pseudo-first order (PFO), pseudo-second order (PSO) and intra-particle diffusion kinetic models revealed that PSO mechanism was predominant and the overall rate of dye adsorption process appeared to be controlled by more than one step….
format	Book Section
author	Sumari, Siti Mariam
author_facet	Sumari, Siti Mariam
author_sort	Sumari, Siti Mariam
title	Removal of dyestuff from aqueous solution using layered double hydroxide / Siti Mariam Sumari
title_short	Removal of dyestuff from aqueous solution using layered double hydroxide / Siti Mariam Sumari
title_full	Removal of dyestuff from aqueous solution using layered double hydroxide / Siti Mariam Sumari
title_fullStr	Removal of dyestuff from aqueous solution using layered double hydroxide / Siti Mariam Sumari
title_full_unstemmed	Removal of dyestuff from aqueous solution using layered double hydroxide / Siti Mariam Sumari
title_sort	removal of dyestuff from aqueous solution using layered double hydroxide / siti mariam sumari
publisher	Institute of Graduate Studies, UiTM
publishDate	2016
url	http://ir.uitm.edu.my/id/eprint/20112/ http://ir.uitm.edu.my/id/eprint/20112/1/ABS_SITI%20MARIAM%20SUMARI%20TDRA%20VOL%2010%20IGS%2016.pdf
first_indexed	2023-09-18T23:03:59Z
last_indexed	2023-09-18T23:03:59Z
_version_	1777418360482430976

Removal of dyestuff from aqueous solution using layered double hydroxide / Siti Mariam Sumari

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