ADSORPTION OF ANIONIC DYES FROM AQUEOUS SOLUTIONS BY CALCINED AND UNCALCINED Mg/Al LAYERED DOUBLE HYDROXIDE

Sumari, Siti Mariam; Hamzah, Zaini; Kantasamy, Nesamalar

doi:10.17576/mjas-2016-2004-10

Cited by 14 publications

(8 citation statements)

References 22 publications

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“…The Energy Dispersive X-ray spectroscopy (EDS) analysis of the solids was performed to investigate the incorporation extent of lanthanum in the precipitation product and the method The morphology of the samples consists of platelets or flakes more or less compact, sometimes stacked as packing of lamellas. This morphology is quite similar to that of layered double hydroxides containing divalent and trivalent ions of hydrotalcite type [24,25]. For the Zn4La sample, the particles of quite uniform shapes and sizes are seen to be formed by stacking of numerous platelets with irregular perimeters, generating formations looking as rice grains of about 0.3-0.5 micrometers.…”

Section: Sem/eds Analysismentioning

confidence: 52%

Zn/La Mixed Oxides Prepared by Coprecipitation: Synthesis, Characterization and Photocatalytic Studies

et al. 2020

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Mixed oxides containing zinc and lanthanum were prepared by coprecipitation in alkaline medium, followed by calcination at 400 °C. The initial precipitation product and the calcined form were characterized by Brunauer–Emmett–Teller (BET) method adsorption of nitrogen at −196 °C, Scanning Electron Microscopy/Electron-Probe Microanalysis (SEM/EPM), Ultraviolet - Diffuse Reflectance Spectroscopy (UV-DRS) and Infrared (IR) spectroscopy. The band gap slightly changes from 3.23 eV to 3 eV by calcination. The photocatalytic performance of the solids were investigated in diluted aqueous medium, by using clofibric acid (CA), a stable and toxic molecule used as precursor in some pesticides and drugs, as test compound, possibly found in the wastewaters in low concentrations. The effects of the degradation extent, determined by high performance liquid chromatography (HPLC) and total organic carbon (TOC) measurements, were investigated at different initial concentrations of CA. Within about 60 min the CA degradation is almost total at low concentration values (3 ppm) and reaches over 80% in 180 min for an initial concentration of 50 ppm. Moreover, the CA removal performance of photocatalyst remains excellent after three cycles of use: the removal yield was practically total after 60 min in the first two cycles and reached 95% even in the third cycle.

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Section: Sem/eds Analysismentioning

confidence: 52%

Zn/La Mixed Oxides Prepared by Coprecipitation: Synthesis, Characterization and Photocatalytic Studies

et al. 2020

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“…Both calcined and non-calcined types of clays have been investigated for the removal of reactive dyes but the calcined clays are preferred over noncalcined clays due to their higher surface area and also they show better dye binding capacity [Aguiar et al, 2013;Asouhidou et al, 2012]. The clay-like materials investigated for the removal of reactive dyes include nano-hydroxyapatite [Kyzas et al, 2013], layered double hydroxides (LDH) [Sumari et al, 2016;Aguiar et al, 2013;Asouhidou et al, 2012], Mg(OH) 2 -modified-kaolin [Amin et al, 2015], and also the sea-water neutralized and calcined red mud [de Jesus et al, 2015;de Souza et al, 2013;Wang et al, 2009]. The laccase-modified fumed silica [Kalkan et al, 2014], nano-alumina [Nadafi et al, 2014], zinc and magnesium oxide nanoparticles [Khoshhesab et al, 2015;Venkatesha et al, 2012], kaolinite and smectite [Errais et al, 2012], Mg(OH) 2 -coated bentonite [Chinoune et al, 2016], silylated palygorskite [Xue et al, 2010], and synthetic talc [Rahman et al, 2013] also can be included in this list of clay-like materials.…”

Section: Types Of Ion-exchange Adsorbentsmentioning

confidence: 99%

“…Raw kaolinite, Fouchana clay, and synthetic talc showed quite meager reactive dye binding capacity [Errais et al, 2012, Rahman et al, 2013. On the other hand, laccase modified fumed silica [Kalkan et al, 2014], seawater-neutralized red mud calcined at 500 °C [de Jesus et al, 2015], and calcined Mg/Al LDH [Sumari et al, 2016] showed quite good dye binding capacity. Of the clays investigated, non-calcined Mg/Al LDH showed the highest reactive dye binding capacity for the removal of C.I.…”

Section: Reactive Dye Binding Capacity Of Clay-like Adsorbents and Dymentioning

confidence: 99%

A critical review on recent advancements of the removal of reactive dyes from dyehouse effluent by ion-exchange adsorbents

2018

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The effluent discharged by the textile dyehouses has a seriously detrimental effect on the aquatic environment. Some dyestuffs produce toxic decomposition products and the metal complex dyes release toxic heavy metals to watercourses. Of the dyes used in the textile industry, effluents containing reactive dyes are the most difficult to treat because of their high water-solubility and poor absorption into the fibers. A range of treatments has been investigated for the decolorization of textile effluent and the adsorption seems to be one of the cheapest, effective and convenient treatments. In this review, the adsorbents investigated in the last decade for the treatment of textile effluent containing reactive dyes including modified clays, biomasses, chitin and its derivatives, and magnetic ion-exchanging particles have been critically reviewed and their reactive dye binding capacities have been compiled and compared. Moreover, the dye binding mechanism, dye sorption isotherm models and also the merits/demerits of various adsorbents are discussed. This review also includes the current challenges and the future directions for the development of adsorbents that meet these challenges. The adsorption capacities of adsorbents depend on various factors, such as the chemical structures of dyes, the ionic property, surface area, porosity of the adsorbents, and the operating conditions. It is evident from the literature survey that decolorization by the adsorption shows a great promise for the removal of color from dyehouse effluent. If biomasses want to compete with the established ion-exchange resins and activated carbon, their dye binding capacity will need to be substantially improved.

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“…The phosphate adsorption isotherms were evaluated for LDH, LDH-c, CAF, CAF-LDH and CAF-LDH-c. For this, 20 mg of the produced materials were added to 10 mL of solutions containing different phosphate ions concentrations (from 10 mg/L to 1,000 mg/L) [25,26]. The suspensions were stirred for 24 h in a thermostatic bath at 30 °C and closed system.…”

Section: Adsorption Isothermsmentioning

confidence: 99%

Organic-Inorganic Hybrid Materials: Layered Double Hydroxides and Cellulose Acetate Films as Phosphate Recovery

Castro¹,

Ferreira²,

Eulálio³

et al. 2018

JAST-B

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With demand increasing for phosphate recovery, a considerable share of current research is dedicated to elaborate multifunctional materials. In this way, the objective of this work was to produce hybrid films from the combination of cellulose acetate (CA) biopolymer and magnesium and aluminium layered double hydroxides (LDHs) and investigate their performance for phosphate recovery. In this work, the following materials were prepared and characterized: LDH, calcinated LDH (LDH-c), CA film (CAF), CA film with LDH (CAF-LDH) and CA film with LDH-c (CAF-LDH-c). The produced materials were characterized by X-ray diffraction, thermogravimetric analysis coupled with differential scanning calorimetry and mass spectrometry, attenuated total reflectance Fourier transform infrared spectroscopy and scanning electronic microscopy. The thickness, H 2 O absorption (A H 2 O ), stability in H 2 O and phosphate adsorption of the produced films were evaluated. The adsorption capacity of films was compared to LDHs in powder form. The CAF-LDH and CAF-LDH-c increased film thickness, where CAF-LDH-c was thicker than CAF-LDH. CAF-LDH-c had higher A H 2 O than the other films, because of its increased thickness and mainly because of the H 2 O sorption process of these materials. H 2 O stability of 98.97% for CAF-LDH and 96.81% for CAF-LDH-c suggest the produced films can maintain their structural properties even after a long contact period with aqueous solutions. For the CAF-LDH-c, the maximum adsorption capacity of phosphate, according to the Langmuir-Freundlich model, was 6.98 mg/g. The adsorption value suggests that this film can be used as an efficient phosphorus (P) adsorbent from wastewater or a eutrophicated source.

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ADSORPTION OF ANIONIC DYES FROM AQUEOUS SOLUTIONS BY CALCINED AND UNCALCINED Mg/Al LAYERED DOUBLE HYDROXIDE

Cited by 14 publications

References 22 publications

Zn/La Mixed Oxides Prepared by Coprecipitation: Synthesis, Characterization and Photocatalytic Studies

Zn/La Mixed Oxides Prepared by Coprecipitation: Synthesis, Characterization and Photocatalytic Studies

A critical review on recent advancements of the removal of reactive dyes from dyehouse effluent by ion-exchange adsorbents

Organic-Inorganic Hybrid Materials: Layered Double Hydroxides and Cellulose Acetate Films as Phosphate Recovery

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