Removal of congo red and methyl violet from water using nano clay filled composite hydrogels of poly acrylic acid and polyethylene glycol

Bhattacharyya, R.; Ray, S. K.

doi:10.1016/j.cej.2014.08.030

Cited by 169 publications

(37 citation statements)

References 39 publications

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“…PEG is observed to show major XRD peaks at 2h 5 19.318, 23.328 and a few minor peaks at: 2h 5 26.408, 36.288, 39.748 and 45.228, respectively, which is consistent with data in previous report. 44 Similar peaks were observed in PEG stabilized nano silver particles and also a few other peaks were (111), (200) and (311), respectively, as presented in Figure 4. XRD patterns also represent the face-centered cubic (FCC) structure of nano silver particles 26,47 and the data was found to correspond with the database in the JCPDS File No.…”

supporting

confidence: 78%

“…Figure 3 shows the DSC thermograms of the PEG stabilized nano silver particles. Figure 3(A) shows the DSC curves of PEG 6000 and PEG 8000, displaying melting endothermic peaks [42][43][44] at 59.868C and 60.158C, whereas these melting endothermic peaks were shifted to 60.918C and 61.078C in PEG stabilized nano silver particles, as a consequence of nano silver particles formation.…”

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confidence: 99%

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Preparation and characterization of poly(ethylene glycol) stabilized nano silver particles by a mechanochemical assisted ball mill process

Jayaramudu

Raghavendra

Varaprasad

et al. 2015

J of Applied Polymer Sci

128

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Nano silver particles with an average mean crystallite size of between 10 and 12 nm were synthesized from different molecular weights of poly(ethylene glycol) as a stabilizing agents, through solid state oxidation of silver nitrate using a higher energy planetary ball mill. Ultraviolet-Visible spectra were used to confirm the synthesis of nano silver particles. The surface plasmon resonance bands were observed around 410 nm. Fourier transformed infrared spectrum, X-ray diffraction, and transmission electronic microscopy techniques were used to characterize the nano silver particles synthesized. Thermal stability was determined using thermogravimetic analysis and the elemental composition of the sample was determined by energy dispersive X-ray analysis. The nano silver particles synthesized, exhibited very good antibacterial activity against Gram-positive bacteria (Bacillus) and Gram-negative bacteria (Pseudomonas aeruginosa). Based on the obtained results, it was additionally explored that the size and the stabilization of the nano silver particles synthesized, strongly depend on the molecular weight of poly(ethylene glycol).

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confidence: 78%

mentioning

confidence: 99%

Preparation and characterization of poly(ethylene glycol) stabilized nano silver particles by a mechanochemical assisted ball mill process

Jayaramudu

Raghavendra

Varaprasad

et al. 2015

J of Applied Polymer Sci

128

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“…Some studies are undertaken on removal of heavy toxic metals from wastewaters [8][9][10][11] and restriction of their accumulation in the biosphere [12][13][14]. Barium is among the heavy metals widely present in many industrial effluents, and also has many radioactive isotopes, 133 Ba being the most important one [15].…”

Section: Introductionmentioning

confidence: 99%

Quantitative XRD Analysis of the Structural Changes of Ba-Exchanged Montmorillonite: Effect of an in Situ Hydrous Perturbation

2015

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The structural changes along the c axis, of the Ba-exchanged montmorillonite (Swy-2-Ba), under variable relative humidity (% RH), is investigated. In this regard, the arrangement, amount and position of both exchangeable cation and the water molecules in the interlamellar space (IS), are evaluated. This aim is achieved using the X-ray diffraction (XRD) profile modeling approach that consists of comparing experimental and theoretical patterns calculated from structural models. The contributions of the hydration states and the interlayer water amounts, as a function of the % RH, are registered by quantitative XRD investigation. The validated structural models are heterogeneous, suggesting various proportions of layer types at different RH ranges, which means the coexistence of different mixed layer structure MLS packages, exhibiting different proportions of layers with contrasting hydration states. This result is attributed to the orientation of the applied hydration sequence. Indeed, the interlayer water molecule amounts, which led to the appearance of a logic hydration hysteresis, are strongly affected by hydrous perturbation.

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“…The intra particle diffusion model could represent the adsorption kinetic data quite well for several systems such as congo red-nano clay filled composite hydrogels and methyl violet-nano clay filled composite hydrogels (Bhattacharyya and Ray 2015), Basic yellow 28-amidated pectin/montmorillonite composite (Nesic et al 2014), Rhodamine 6G-chitosan-g-(N-vinyl pyrrolidone)/montmorillonite composite (Vanamudan et al 2014), Cobalt(II)-chitosan-montmorillonite (Wang et al 2014), Indigo carmine-CdSe montmorillonite composite (Chikate and Kadu 2014), picloram herbicide-montmorillonite (Marco-Brown et al 2014), phenol and cathecol-gemini surfactant modified montmorillonite …”

Section: Intraparticle Diffusion Modelmentioning

confidence: 99%

“…In general, the plots consist of three linear portions which confirm that the external mass transfer at the initial stage is followed by intra particle pore diffusion into macropores, mesopores and micropores. The slope of the second linear portion is the rate constant for intra particle diffusion while its intercept is proportional to the boundary layer thickness (Bhattacharyya and Ray 2015).…”

Section: Intraparticle Diffusion Modelmentioning

confidence: 99%

The Kinetic Studies in the Adsorption of Hazardous Substances Using Clay Minerals

Ismadji

Soetaredjo

Ayucitra

2015

SpringerBriefs in Molecular Science

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For the design of the adsorption system, reliable adsorption kinetic data are required. Different concepts are employed to develop a reliable adsorption kinetic model. Most of the available models were developed according to mass transfer principles or the concept of chemical reaction occurring on the surface of a solid. The models based on the surface-reaction kinetic step as controlling the sorption rate have also been proposed, these models include pseudo-first order kinetic (also called as Lagergren model), pseudo-second order kinetic, and Elovich equation. This chapter discusses various aspects of pseudo-first order kinetic and pseudo-second order kinetic in representing the adsorption kinetic data of some hazardous compounds onto clay minerals. The pseudo-first order kinetic is the earliest known equation to describe the rate of sorption in the liquid phase system. The behavior of time constant parameters k 1 and k 2 of pseudo-first order kinetics and pseudo-second order kinetics as a function of initial concentration as well as the temperature is discussed in this chapter. One of the kinetic models which also widely used to represent the sorption kinetic data is an intraparticle diffusion model also briefly discussed in this chapter.Keywords Adsorption kinetic · Pseudo-first · Pseudo-second · Intraparticle diffusion Adsorption kinetics are expressed as the solute removal rate that controls the residence time of the solute in the solid-solution interface. Reliable sorption kinetic data are of substantial value for adsorption separation system design. Various models have been developed to adequately describe the kinetics of sorption of the solid-liquid system. However, due to its complexity compared to the description of adsorption equilibria, the progress of development of various sorption kinetics appears to be limited. In general, the adsorption of solute from aqueous solution

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Removal of congo red and methyl violet from water using nano clay filled composite hydrogels of poly acrylic acid and polyethylene glycol

Cited by 169 publications

References 39 publications

Preparation and characterization of poly(ethylene glycol) stabilized nano silver particles by a mechanochemical assisted ball mill process

Preparation and characterization of poly(ethylene glycol) stabilized nano silver particles by a mechanochemical assisted ball mill process

Quantitative XRD Analysis of the Structural Changes of Ba-Exchanged Montmorillonite: Effect of an in Situ Hydrous Perturbation

The Kinetic Studies in the Adsorption of Hazardous Substances Using Clay Minerals

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