Single and Binary Adsorption Systems of Rhodamine B and Methylene Blue onto Alkali-Activated Vietnamese Diatomite

Diatomite was slightly modified with a sodium hydroxide solution. The resulting material was characterized by using energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and nitrogen adsorption-desorption isotherms. The so-treated diatomite has a high specific surface area (77.8 m2/g) and a high concentration of isolated silanol groups on the surface, and therefore, its adsorption capacity increases drastically in both the single and binary adsorption systems for rhodamine B and methylene blue. The binary system is more effective than the single system, with methylene blue being adsorbed more than rhodamine B. The adsorption process is spontaneous and fits well with the Langmuir isothermal model, and it depends on pH significantly.

Download Full-text

Biomass-Derived Activated Carbon as a Catalyst for the Effective Degradation of Rhodamine B dye

Processes ◽

10.3390/pr8080926 ◽

2020 ◽

Vol 8 (8) ◽

pp. 926

Author(s):

Shamim Ahmed Hira ◽

Mohammad Yusuf ◽

Dicky Annas ◽

Hu Shi Hui ◽

Kang Hyun Park

Keyword(s):

Electron Microscopy ◽

Activated Carbon ◽

Rhodamine B ◽

Photoelectron Spectroscopy ◽

High Specific Surface Area ◽

High Porosity ◽

X Ray Diffraction ◽

Experimental Conditions ◽

X Ray ◽

Transmission Electron

Activated carbon (AC) was fabricated from carrot waste using ZnCl2 as the activating agent and calcined at 700 °C for 2 h in a tube furnace. The as-synthesized AC was characterized using Fourier-transform infrared spectroscopy, X-ray diffraction analysis, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and Brunauer–Emmett–Teller analysis; the results revealed that it exhibited a high specific surface area and high porosity. Moreover, this material displayed superior catalytic activity for the degradation of toxic Rhodamine B (RhB) dye. Rate constant for the degradation of RhB was ascertained at different experimental conditions. Lastly, we used the Arrhenius equation and determined that the activation energy for the decomposition of RhB using AC was approximately 35.9 kJ mol−1, which was very low. Hopefully it will create a great platform for the degradation of other toxic dye in near future.

Download Full-text

Preparation of Zirconia Nanofibers by Electrospinning and Calcination with Zirconium Acetylacetonate as Precursor

Polymers ◽

10.3390/polym11061067 ◽

2019 ◽

Vol 11 (6) ◽

pp. 1067 ◽

Cited By ~ 5

Author(s):

Vyacheslav V. Rodaev ◽

Svetlana S. Razlivalova ◽

Andrey O. Zhigachev ◽

Vladimir M. Vasyukov ◽

Yuri I. Golovin

Keyword(s):

Specific Surface ◽

Surface Area ◽

Specific Surface Area ◽

Heterogeneous Catalysts ◽

Tetragonal Zirconia ◽

Nitrogen Adsorption ◽

Average Diameter ◽

High Specific Surface Area ◽

X Ray ◽

Adsorption Analysis

For the first time, zirconia nanofibers with an average diameter of about 75 nm have been fabricated by calcination of electrospun zirconium acetylacetonate/polyacrylonitrile fibers in the range of 500–1100 °C. Composite and ceramic filaments have been characterized by scanning electron microscopy, thermogravimetric analysis, nitrogen adsorption analysis, energy-dispersive X-ray spectroscopy, and X-ray diffractometry. The stages of the transition of zirconium acetylacetonate to zirconia have been revealed. It has been found out that a rise in calcination temperature from 500 to 1100 °C induces transformation of mesoporous tetragonal zirconia nanofibers with a high specific surface area (102.3 m2/g) to non-porous monoclinic zirconia nanofibers of almost the same diameter with a low value of specific surface area (8.3 m2/g). The tetragonal zirconia nanofibers with high specific surface area prepared at 500 °C can be considered, for instance, as promising supports for heterogeneous catalysts, enhancing their activity.

Download Full-text

Investigation of ZnO/CuO/Nanographene Platelets Composites Catalyst for the Degradation of Methylene Blue from Aqueous Solution

Materials Science Forum ◽

10.4028/www.scientific.net/msf.864.117 ◽

2016 ◽

Vol 864 ◽

pp. 117-122 ◽

Cited By ~ 1

Author(s):

Hesni Shabrany ◽

Hendry Tju ◽

Ardiansyah Taufik ◽

Rosari Saleh

Keyword(s):

Aqueous Solution ◽

Methylene Blue ◽

Catalytic Activity ◽

Visible Light ◽

Sol Gel ◽

Nitrogen Adsorption ◽

Ultrasound Irradiation ◽

X Ray Diffraction ◽

X Ray

This paper discusses the catalytic activity of ZnO/CuO/nanographene platelets composites under visible light and ultrasound irradiation separately. The ZnO/CuO/nanographene platelets composites were synthesized using a sol-gel method. X-ray diffraction and nitrogen adsorption spectroscopy were employed to investigate the structural and surface area of the catalyst. The catalytic activity results showed that the presence of nanographene platelets in ZnO/CuO nanocomposites improved its efficiency in degrading methylene blue. A scavenger method was also used to understand the role of charged carriers and the active radical involved in the catalytic activity.

Download Full-text

Adsorption of Methylene Blue by Hydroxyl-Aluminum Pillared Montmorillonite

Journal of the chemical society of pakistan ◽

10.52568/000673 ◽

2020 ◽

Vol 42 (4) ◽

pp. 550-550

Author(s):

Houria Rezala Houria Rezala ◽

Houda Douba Houda Douba ◽

Horiya Boukhatem and Amaya Romero Horiya Boukhatem and Amaya Romero

Keyword(s):

Methylene Blue ◽

Nitrogen Adsorption ◽

Bet Surface Area ◽

Basal Spacing ◽

Solution Ph ◽

X Ray ◽

Pillared Montmorillonite ◽

Pseudo Second Order ◽

Adsorption Desorption ◽

Kinetics And Isotherms

A purified raw montmorillonite and hydroxy-aluminum pillared montmorillonite have been prepared from a natural bentonite from Maghnia, Algeria. These materials have been analyzed by X-ray fluorescence spectroscopy, X-ray diffraction, Infrared spectroscopy and nitrogen adsorption-desorption measurement. The pillared montmorillonite provided a certain increase of interlayer basal spacing and BET surface area and consequently the improvement of its capacities adsorption and decolorization of Methylene Blue. The adsorption properties of these materials were studied as a function of contact time, solution pH, initial Methylene Blue concentration and temperature. The adsorption kinetics and isotherms were well fitted by pseudo-second order and Freundlich models, respectively. In addition to that, thermodynamic studies showed an exothermic and a spontaneous process.

Download Full-text

Preparation and application of two novel supramolecular polyoxmetalates with adsorption of organic contaminants in wastewater

Main Group Chemistry ◽

10.3233/mgc-210021 ◽

2021 ◽

Vol 20 (1) ◽

pp. 69-79

Author(s):

Wen-Hao Yang ◽

Ying Pei ◽

Hao-Yu Du ◽

Shang-Hao Xiao ◽

Xiu-Jun Wu ◽

...

Keyword(s):

Methylene Blue ◽

Ir Spectra ◽

Rhodamine B ◽

Organic Contaminants ◽

Organic Dyes ◽

X Ray Diffraction ◽

Hydrothermal Conditions ◽

Adsorption Effect ◽

X Ray ◽

Elemental Analyses

Two new supramolecular polyoxmetalates were synthesized from 1, 4-bis[4-nitrile-pyridine)-N-methylene]phenyldibromide (L1) and 1, 2-bis[4-nitrile-pyridine)-N-methylene]phenyldibromide (L2) and (NH4)6Mo7–O24·4H2O under hydrothermal conditions. They are named p-[C20H18N2O4][Mo8O26] 0.5·H2O (1) and o-[C20H18N2O4][Mo8O26] ċ 0.5·H2O (2) respectively. The structures have been confirmed through single-crystal X-ray diffraction analyses and further characterized by elemental analyses, IR spectra. The adsorption test of compound 1 and compound 2 in organic dyes were carried out. It was found that compound 1 had a good adsorption effect on methylene blue (MB) and rhodamine B (RhB). The adsorption effect of compound 2 on MB is stronger than that of compound 1.

Download Full-text

BaGdF5 Nanophosphors Doped with Different Concentrations of Eu3+ for Application in X-ray Photodynamic Therapy

International Journal of Molecular Sciences ◽

10.3390/ijms222313040 ◽

2021 ◽

Vol 22 (23) ◽

pp. 13040

Author(s):

Zaira Gadzhimagomedova ◽

Vladimir Polyakov ◽

Ilia Pankin ◽

Vera Butova ◽

Daria Kirsanova ◽

...

Keyword(s):

Methylene Blue ◽

Photodynamic Therapy ◽

Nitrogen Adsorption ◽

Shell Morphology ◽

X Rays ◽

Amorphous Sio2 ◽

Shell Size ◽

X Ray ◽

Efficient Alternative ◽

Average Size

X-ray photodynamic therapy (XPDT) has been recently considered as an efficient alternative to conventional radiotherapy of malignant tissues. Nanocomposites for XPDT typically consist of two components—a nanophosphor which re-emits X-rays into visible light that in turn is absorbed by the second component, a photosensitizer, for further generation of reactive oxygen species. In this study, BaGdF5 nanophosphors doped with different Eu:Gd ratios in the range from 0.01 to 0.50 were synthesized by the microwave route. According to transmission electron microscopy (TEM), the average size of nanophosphors was ~12 nm. Furthermore, different coatings with amorphous SiO2 and citrates were systematically studied. Micro-CT imaging demonstrated superior X-ray attenuation and sufficient contrast in the liver and the spleen after intravenous injection of citric acid-coated nanoparticles. In case of the SiO2 surface, post-treatment core–shell morphology was verified via TEM and the possibility of tunable shell size was reported. Nitrogen adsorption/desorption analysis revealed mesoporous SiO2 formation characterized by the slit-shaped type of pores that should be accessible for methylene blue photosensitizer molecules. It was shown that SiO2 coating subsequently facilitates methylene blue conjugation and results in the formation of the BaGdF5: 10% Eu3+@SiO2@MB nanocomposite as a promising candidate for application in XPDT.

Download Full-text

Doped Ti-pillared clays as effective adsorbents – Application to methylene blue and trimethoprim removal

Environmental Chemistry ◽

10.1071/en16192 ◽

2017 ◽

Vol 14 (5) ◽

pp. 267 ◽

Cited By ~ 7

Author(s):

Beatriz González ◽

Raquel Trujillano ◽

Miguel A. Vicente ◽

Vicente Rives ◽

Emerson H. de Faria ◽

...

Keyword(s):

Methylene Blue ◽

Thermal Analyses ◽

Nitrogen Adsorption ◽

Human Consumption ◽

New Materials ◽

X Ray Diffraction ◽

X Ray ◽

Ft Ir ◽

Elemental Chemical Analysis ◽

Ft Ir Spectroscopy

Environmental contextWater is an essential compound for life; however, several factors limit the amount available for human consumption. Every day, thousands of pollutants are discharged into drinking water. Here, new materials that are efficient as adsorbents and photocatalysts for pollutants are reported. AbstractMontmorillonite was treated with Ti-based solutions doped with various transition metal cations, leading after calcination at 500°C to new doped Ti-pillared montmorillonite solids. These solids were characterised by elemental chemical analysis, powder X-ray diffraction, Fourier-transform (FT)-IR spectroscopy, thermal analyses, nitrogen adsorption, acidity evaluation and electron microscopy. The performance of these solids in the degradation of methylene blue and the adsorption of trimethoprim was evaluated.

Download Full-text

Ultrasonically Induced Sulfur-Doped Carbon Nitride/Cobalt Ferrite Nanocomposite for Efficient Sonocatalytic Removal of Organic Dyes

Processes ◽

10.3390/pr8010104 ◽

2020 ◽

Vol 8 (1) ◽

pp. 104 ◽

Cited By ~ 5

Author(s):

Surabhi Kamal ◽

Guan-Ting Pan ◽

Siewhui Chong ◽

Thomas Chung-Kuang Yang

Keyword(s):

Methylene Blue ◽

Rhodamine B ◽

Photoelectron Spectroscopy ◽

Congo Red ◽

Carbon Nitride ◽

Cobalt Ferrite ◽

Organic Dyes ◽

Bandgap Energy ◽

X Ray ◽

Dye Pollutants

The sulfur-doped carbon nitride/cobalt ferrite nanocomposite (SCN/CoFe2O4) was prepared via ultrasonication and studied for the sonocatalytic degradation of wastewater organic dye pollutants including methylene blue, rhodamine B, and Congo red. The X-ray photoelectron spectroscopy confirmed the presence and atomic ratios of S, C, N, Co, Fe, and O elements and their corresponding bonds with Co2+ and Fe3+ cations. The nanocomposite was found to have aggregated nanoparticles on a sheet-like structure. The bandgap energy was estimated to be 1.85 eV. For the sonocatalytic degradation of 25-ppm methylene blue at 20 kHz, 1 W and 50% amplitude, the best operating condition was determined to be 1 g/L of catalyst dosage and 4 vol % of hydrogen peroxide loading. Under this condition, the sonocatalytic removal efficiency was the highest at 96% within a reaction period of 20 min. SCN/CoFe2O4 outperformed SCN and CoFe2O4 by 2.2 and 6.8 times, respectively. The SCN/CoFe2O4 nanocomposite was also found to have good reusability with a drop of only 7% after the fifth cycle. However, the degradation efficiencies were low when tested with rhodamine B and Congo red due to difference in dye sizes, structural compositions, and electric charges.

Download Full-text

The impregnation of ZnO onto ZSM-5 derived from red mud for photocatalytic degradation of methylene blue

Sustainable Environment Research ◽

10.1186/s42834-021-00113-8 ◽

2022 ◽

Vol 32 (1) ◽

Author(s):

Hellna Tehubijuluw ◽

Riki Subagyo ◽

Yuly Kusumawati ◽

Didik Prasetyoko

Keyword(s):

Methylene Blue ◽

Photocatalytic Degradation ◽

Red Mud ◽

Diffuse Reflectance Spectroscopy ◽

Degradation Products ◽

Nitrogen Adsorption ◽

Liquid Chromatography Mass Spectrometry ◽

X Ray Diffraction ◽

X Ray ◽

Adsorption Desorption

AbstractPhotocatalytic degradation of Methylene Blue (MB) by zinc oxide/zeolite socony mobile-5 (ZnO/ZSM-5) composites was investigated. The ZSM-5 material was synthesized from red mud by a two-step hydrothermal method to which ZnO loadings at different mass ratios were subsequently performed. Characterizations using X-ray diffraction (XRD), Fourier transform infrared spectroscopy, and scanning electron microscopy were carried out to identify the formation of ZSM-5 and ZnO/ZSM-5. ZSM-5 and ZnO/ZSM-5 have cubic microcrystallite morphologies. ZnO loading in the ZnO/ZSM-5 composites was successfully performed and confirmed by the appearance of wurtzite peaks in the XRD spectra that matched the Joint Committee on Powder Diffraction Standards data. The presence of ZnO in ZSM-5 leading resulted in a decrease in the surface area and pore size as confirming by nitrogen adsorption-desorption isotherm experiments. The band gap of the samples was measured using UV-Vis diffuse reflectance spectroscopy. The optimum photocatalytic degradation of MB was observed at a ZnO loading of 34% w/w dubbed 34-ZnO/ZSM-5. The influence of the initial concentration of MB was also investigated at 80, 90, and 100 mg L− 1 using 34-ZnO/ZSM-5 and ZSM-5. Liquid chromatography–mass spectrometry characterization was performed to analyze the degradation products.

Download Full-text

Efficient Removal of Methylene Blue from Aqueous Solutions Using a High Specific Surface Area Porous Carbon Derived from Soybean Dreg

Materials ◽

10.3390/ma14071754 ◽

2021 ◽

Vol 14 (7) ◽

pp. 1754

Author(s):

Zhiwei Ying ◽

Lu Huang ◽

Lili Ji ◽

He Li ◽

Xinqi Liu ◽

...

Keyword(s):

Electron Microscopy ◽

Methylene Blue ◽

Specific Surface ◽

Surface Area ◽

Specific Surface Area ◽

Porous Carbon ◽

Carbon Material ◽

High Specific Surface Area ◽

Maximum Adsorption Capacity ◽

X Ray

Porous carbon material with high specific surface area was prepared from soybean dreg by a simple and effective two-step method (high temperature pyrolysis and activation). The structural characteristics of the synthesized carbon were evaluated by Brunauer–Emmett–Teller (BET), N2 adsorption/desorption measurements/techniques, an elemental analyzer (EA), scanning electron microscopy equipped with energy dispersive X-ray spectroscopy (SEM-EDS), transmission electron microscopy (TEM), an X-ray diffractometer (XRD), Raman spectroscopy (Raman), a Fourier transform infrared spectrometer (FTIR), and X-ray photoelectron spectroscopy (XPS). The specific surface area of SDB-6-K was 2786 m2 g−1, the pore volume was 2.316 cm3 g−1, and the average pore size was 3.326 nm. The high specific surface area and effective functional groups of carbon material promoted the adsorption of methylene blue. The maximum adsorption capacity of SDB-6-K to methylene blue was 2636 mg g−1 at 318 K. The adsorption kinetic and isotherm data were most suitable for pseudo-second-order and Langmuir equations. The results showed that the adsorbent had excellent adsorptive ability and had good practical application potential in the field of dye wastewater treatment in the future.

Download Full-text