Rapid removal of methylene blue and nickel ions and adsorption/desorption mechanism based on geopolymer adsorbent

Methylene blue (MB) was used as model molecule to investigate the effects of surface properties and solvent pH values on the adsorption and desorption (or release) behaviors of mesoporous SBA-15 materials. It was found that the treatment of SBA-15 with a pH 7.8 aqueous solution can enhance the adsorption rate and capacity in comparison with the pristine SBA-15. The effect of pH values on MB releasing from the weak base treated SBA-15 and the pristine one have been studied and been compared in pH values range from 0.5 to 7.0. Both of them showed a maximum releasing rate at about pH 2 and all of the treated SBA-15 samples showed a higher releasing quantity than the pristine ones. The influence mechanisms of base treatment on the adsorption ability and that of pH values on the releasing properties of SBA-15 samples have been analyzed and been discussed based on the composition, the morphology, the surface area and pore size distribution and adsorption/desorption measurements.

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Facile Preparation of Nanoporous SnO2 for Application in Photodegradation of Methylene Blue

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.194-196.385 ◽

2011 ◽

Vol 194-196 ◽

pp. 385-388

Author(s):

Hong Juan Wang ◽

Feng Qiang Sun ◽

Ming Zhong Ren ◽

Qing Wei Guo

Keyword(s):

Aqueous Solution ◽

Methylene Blue ◽

Photocatalytic Activity ◽

Photocatalytic Performance ◽

Uv Light ◽

High Photocatalytic Activity ◽

N2 Adsorption ◽

Photochemical Method ◽

Degussa P25 ◽

Adsorption Desorption

Nanoporous SnO2with high photocatalytic activity has been successfully prepared by a photochemical method, using SnCl2aqueous solution as a precursor. The as-synthesized sample was characterized by XRD, N2 adsorption-desorption and UV-vis. The photocatalytic activity of the sample was evaluated by degrading methylene blue (MB) aqueous solution under the UV light source and was compared with that of the commercial titania (Degussa P25). The results showed that the produced SnO2can degrade MB solution quickly and has comparative photocatalytic performance with P25 for degrading MB. This facile method supplies an effective way to prepare SnO2photocatalyst.

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Kinetics of methylene blue dye adsorptive removal using halloysite nanocomposite hydrogels

Zeitschrift für Physikalische Chemie ◽

10.1515/zpch-2021-3075 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Sadia Ata ◽

Sadaf Amin ◽

Ismat Bibi ◽

Ijaz-ul- Mohsin ◽

Atif Islam ◽

...

Keyword(s):

Methylene Blue ◽

Polymer Chains ◽

Blue Dye ◽

Methylene Blue Dye ◽

Nanocomposite Hydrogels ◽

Antimicrobial Efficiency ◽

Nano Clay ◽

Swelling Capacity ◽

Solution Casting Method ◽

Adsorption Desorption

Abstract In the present work, halloysite nano-clay (HNTs) based hydrogel was fabricated and their efficiency for the removal of methylene blue dye was studied. The hydrogel films were prepared with varying amount of halloysite nano-clay via facile solution casting method. Effect of halloysite clay on adsorption performance of composite was investigated. The hydrophobic thermoplastic synthetic polymer, polylactic acid (PLA) was blended with hydrophilic polymer polyvinyl alcohol (PVA) and HNTs to synthesize hydrogels. Swelling behavior and antimicrobial efficiency was also evaluated. The halloysite incorporating films showed excellent antibacterial activity. Swelling capacity of hydrogel with increased halloysite content was reduced due to increased crosslinking among polymer chains. Halloysite incorporated hydrogel exhibited higher adsorption ability as compared to film comprising of only PVA and PLA and dye removal followed pseudo first order kinetics. Film with 0.03 g HNTs rapidly attained adsorption-desorption equilibria and removed the dye completely within 30 min. Results confirmed that synthesized film could be potentially used for the removal of cationic dye and fabricated hydrogel film have promising potential for wastewater treatment since a higher adsorption capacity was observed for halloysite nano-clay incorporated hydrogel.

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Synthesis of Novel Core-Shell Structured Hydroxyapatite/Meso-Silica for Removal of Methylene Blue from Aqueous Solutions

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.463-464.543 ◽

2012 ◽

Vol 463-464 ◽

pp. 543-547 ◽

Cited By ~ 2

Author(s):

Cheng Feng Li ◽

Xiao Lu Ge ◽

Shu Guang Liu ◽

Fei Yu Liu

Keyword(s):

Methylene Blue ◽

Aqueous Solutions ◽

Specific Surface ◽

Surface Area ◽

Specific Surface Area ◽

Low Cost ◽

Nitrogen Adsorption ◽

Precipitation Method ◽

Core Shell ◽

Adsorption Desorption

Core-shell structured hydroxyapatite (HA)/meso-silica was prepared and used as absorbance of methylene blue (MB). HA/meso-silica was synthesized in three steps: preparation of nano-sized HA by wet precipitation method, coating of dense silica and deposition of meso-silica shell on HA. As-received samples were characterized by Fourier transformed infare spectra, small angle X-ray diffraction, nitrogen adsorption-desorption isotherm and transmission electron microscopy. A wormhole framework mesostructure was found for HA/meso-silica. The specific surface area and pore volume were 128 m2•g-1 and 0.36 cm3•g-1, respectively. From the adsorption isotherm, HA/meso-silica with the great specific surface area exhibited a prominent adsorption capacity of MB (134.0 mg/g) in comparison with bare HA (0 mg/g). This study might shed light on surface modification of conventional low-cost adsorbents for removal of organic pollutants from aqueous solutions.

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ZnO-SiO2/Laponite Photocatalyst: Kinetic Study on Photocatalytic Decolorization of Methylene Blue

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.896.541 ◽

2014 ◽

Vol 896 ◽

pp. 541-544

Author(s):

Is Fatimah ◽

N. Nunani Yuyun

Keyword(s):

Methylene Blue ◽

Energy Dispersive Spectrometry ◽

Photocatalytic Performance ◽

Sol Gel ◽

X Ray Diffraction ◽

X Ray ◽

Photocatalytic Decolorization ◽

Uv Visible ◽

Gel Preparation ◽

Adsorption Desorption

ZnO-SiO2/Laponite was prepared by sol-gel preparation procedure consit of SiO2 pillarization to laponite followed by ZnO dispersion by using zinc acetate as precursor. The obtained material was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), diffuse reflectance UV-Visible (DRUV-Vis) and N2 adsorption-desorption analysis. The photocatalytic performance of the amterial in methylene blue decolorization was also investigated. Compared with ZnO-SiO2 nanoparticles, it is concluded that ZnO-SiO2/Laponite possess higher photocatalytic activity which obey Temkin isotherm model.

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