scholarly journals Release of toxic methylene blue from water by mesoporous silicalite-1: characterization, kinetics and isotherm studies

2021 ◽  
Vol 11 (7) ◽  
Author(s):  
Sabarish Radoor ◽  
Jasila Karayil ◽  
Aswathy Jayakumar ◽  
Jyotishkumar Parameswaranpillai ◽  
Suchart Siengchin
Keyword(s):  
Electron Microscopy ◽  
Contact Time ◽  
Dye Removal ◽  
Batch Adsorption ◽  
Aqueous Environment ◽  
Order Kinetic ◽  
Adsorption Method ◽  
X Ray ◽  
Ft Ir ◽  
Adsorption Desorption

AbstractIn the present work, we have developed a mesoporous silicalite-1 using CMC as a template for the removal of MB from aqueous solution. The synthesized silicalite-1 were characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), Energy-dispersive X-ray spectroscopy (EDAX) and N2 adsorption–desorption isotherm (BET). XRD and FT-IR analysis confirmed the formation of crystallinity and development of MFI structure in the mesoporous silicalite-1. The adsorption of MB dye on mesoporous silicalite-1 was conducted by batch adsorption method. The effect of various parameters such as adsorbent dosage, initial dye concentration, contact time and temperature on the dye uptake ability of silicalite-1 was investigated. The operating parameters for the maximum adsorption are silicalite-1 dosage (0.1 wt%), contact time (240 min), initial dye concentration (10 ppm) and temperature (30 ℃). The MB dye removal onto mesoporous silicalite-1 followed pseudo-second-order kinetic and Freundlich isotherm. The silicalite-1 exhibits 86% removal efficiency even after six adsorption–desorption cycle. Therefore, the developed mesoporous silicalite-1 is an effective eco-friendly adsorbent for MB dye removal from aqueous environment.

scholarly journals Removal of methylene blue from aqueous solution by mesoporous silicalite-1 synthetized using carboxymethyl cellulose as template

2021 ◽  
Author(s):  
Sabarish Radoor ◽  
Jasila Karayil ◽  
Aswathy Jayakumar ◽  
Jyothi Mannekote Shivanna ◽  
Jyotishkumar Parameswaranpillai ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Contact Time ◽  
Dye Removal ◽  
Batch Adsorption ◽  
Aqueous Environment ◽  
Order Kinetic ◽  
Adsorption Method ◽  
X Ray ◽  
Adsorption Desorption

Abstract In the present work, we have developed a mesoporous silicalite-1 using CMC as a template for the removal of MB from aqueous solution. The synthesized silicalite-1 were characterised using scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), Energy-dispersive X-ray spectroscopy (EDX) and N2 adsorption-desorption isotherm (BET). XRD and FTIR analysis confirmed the formation of crystallinity and development of MFI structure in the mesoporous silicalite-1. The adsorption of MB dye on mesoporous silicalite-1 was conducted by batch adsorption method. The effect of various parameters such as adsorbent dosage, initial dye concentration, contact time and temperature on the dye uptake ability of silicalite-1 was investigated. The operating parameters for the maximum adsorption are silicalite-1 dosage (0.1 wt%), contact time (240 min), initial dye concentration (10 ppm) and temperature (30℃). The MB dye removal onto mesoporous silicalite-1 followed pseudo-second-order kinetic and Freundlich isotherm. The silicalite-1 exhibits 86% removal efficiency even after six adsorption-desorption cycle. Therefore, the developed mesoporous silicalite-1 is an effective eco-friendly adsorbent for MB dye removal from aqueous environment.

scholarly journals Removal of methylene blue from aqueous solution by mesoporous silicalite-1 synthetized using carboxymethyl cellulose as template

2021 ◽  
Author(s):  
Sabarish Radoor ◽  
Jasila Karayil ◽  
Aswathy Jayakumar ◽  
Jyothi Mannekote Shivanna ◽  
Jyotishkumar Parameswaranpillai ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Contact Time ◽  
Dye Removal ◽  
Batch Adsorption ◽  
Aqueous Environment ◽  
Order Kinetic ◽  
Adsorption Method ◽  
X Ray ◽  
Adsorption Desorption

Abstract In the present work, we have developed a mesoporous silicalite-1 using CMC as a template for the removal of MB from aqueous solution. The synthesized silicalite-1 were characterised using scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), Energy-dispersive X-ray spectroscopy (EDX) and N2 adsorption-desorption isotherm (BET). XRD and FTIR analysis confirmed the formation of crystallinity and development of MFI structure in the mesoporous silicalite-1. The adsorption of MB dye on mesoporous silicalite-1 was conducted by batch adsorption method. The effect of various parameters such as adsorbent dosage, initial dye concentration, contact time and temperature on the dye uptake ability of silicalite-1 was investigated. The operating parameters for the maximum adsorption are silicalite-1 dosage (0.1 wt%), contact time (240 min), initial dye concentration (10 ppm) and temperature (30°C). The MB dye removal onto mesoporous silicalite-1 followed pseudo-second-order kinetic and Freundlich isotherm. The silicalite-1 exhibits 86% removal efficiency even after six adsorption-desorption cycle. Therefore, the developed mesoporous silicalite-1 is an effective eco-friendly adsorbent for MB dye removal from aqueous environment.

Performance of CO2 Adsorption with MEA-AN Modified Solid Adsorbent

2013 ◽  
Vol 341-342 ◽  
pp. 13-17
Author(s):  
Xiao Yun Zhang ◽  
Hong Yan Qin ◽  
Xiu Xin Zheng ◽  
Shi Hu Yu ◽  
Wei Wu
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Pore Channel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Solid Adsorbent ◽  
Satisfactory Performance ◽  
Transmission Electron ◽  
Ft Ir ◽  
Adsorption Desorption

CO2solid adsorbent was prepared through impregnating acrylonitrile (AN) modified monoethanolamine (MEA) into structurally disordered mesoporous silica (M) pore channel. Its structure was characterized by X-ray diffraction characterization (XRD), N2adsorption-desorption tests (BET), Transmission electron microscopy (TEM) and Fourier transform infrared (FT-IR). The capacity of CO2adsorption and desorption were measured and evaluated by comparison with MEA-impregnated material. The results showed that the capacity of M-MN-50 reached up to 125.8 mg·g-1and could desorb completely at the temperature of 40 °C by vacuum with 2.6 KPa. The hybrid material exhibited satisfactory performance during 10 turnovers.

scholarly journals ADSORPTION OF PHENOL POLLUTANTS FROM AQUEOUS SOLUTION USING Ca-BENTONITE/CHITOSAN COMPOSITE

2015 ◽  
Vol 22 (2) ◽  
pp. 233 ◽  
Author(s):  
Poedji Loekitowati Hariani ◽  
Fatma Fatma ◽  
Fahma Riyanti ◽  
Hesti Ratnasari
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Contact Time ◽  
Batch Adsorption ◽  
Shrimp Waste ◽  
Initial Concentration ◽  
X Ray ◽  
Chitosan Composite ◽  
Scanning Electron

Phenolic compounds areorganic pollutants that are toxic and carcinogenic.The presence of phenol in the environmentcan be adverse to humanand the environmentalsystem. One methodthat iseffective toreduce thephenolisadsorption. In this study, the adsorption of phenol in aqueous solution using Ca-bentonite/chitosan composite was investigated. Chitosan is the deacetylation product of chitin from shrimp waste. Characterization of Ca-bentonite/chitosan composite was done by using Fourier Transform Infrared (FTIR) and Scanning Electron Microscopy-Energy Dispersive X Ray Spectroscopy (SEM-EDX). Batch adsorption studies were performed to evaluate the effects of some parameters such as initial concentration of phenol, composite weight, pH and contact time. The results showed that FTIR spectra of Ca-bentonite/chitosan composite presented the characteristic of peak of Ca-bentonite and chitosan that confirmed the successful synthesis of composite. The SEM-EDX characterizationresultsshowedCa-bentonite surfacecoverage by chitosanand the presence ofcarbonandnitrogenelementsinCa-bentonite/chitosancompositeindicated that chitosan had bonded with bentonite. The optimum condition of adsorption of Ca-bentonite/chitosan to phenol was obtained at 125 mg.L-1 of concentration in which the weight of composite was 1.0 g, the pH of solution was 7, the contact time was 30 minutes, and the capacity of adsorption was 12.496 mg.g-1.

scholarly journals The use of zinc metalloporphyrin grafted magnetic nanoparticles for the removal of sulfate ions from wastewaters

2019 ◽  
Vol 2 (2) ◽  
pp. 65-76
Author(s):  
Tahereh Poursaberi ◽  
Ali Akbar Miran Beigi
Keyword(s):  
Electron Microscopy ◽  
Contact Time ◽  
Optimal Conditions ◽  
X Ray Diffraction ◽  
Sulfate Ions ◽  
X Ray ◽  
Transmission Electron ◽  
Naoh Solution ◽  
Ft Ir ◽  
Scanning Electron

This study investigates an application of zinc metalloporphyrin grafted Fe3O4 nanoparticles as a new adsorbent for removal of sulfate ions from wastewaters. The modification of magnetite nanoparticles was conducted by 3-aminopropyltriethoxysilane followed by zinc (II) porphyrin in order to enhance the removal of sulfate ions. Fourier Transform Infrared Spectroscopy (FT-IR), X-ray diffraction (XRD), Transmission Electron Microscopy (TEM) and Scanning Electron Microscopy (SEM) was used to characterize the synthesized nano sorbent. The effect of important experimental factors such as pH, contact time, sorbent dosage and some co-existing anions present in aqueous solutions were investigated. Under optimal conditions (i.e. contact time: 30 min, pH: 6.5 and nanosorbents dosage: 100 mg) for a sulfate sample (50 mL, 50 mgL-1 ) the percentage of the extracted sulfate ions was 94.5%. Regeneration of sulfate adsorbed material could be possible by NaOH solution and the modified magnetic nano sorbent exhibited good reusability.

Amino-silica coated magnetic nanoparticles modified with Ni(II)- metalloporphyrin for the selective removal of nitrate ions from water samples

2012 ◽  
Vol 16 (04) ◽  
pp. 390-395 ◽  
Author(s):  
Tahereh Poursaberi ◽  
Mostafa Hassanisadi ◽  
Maryam Shanehsaz
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Magnetic Nanoparticles ◽  
Aqueous Solutions ◽  
Contact Time ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ft Ir ◽  
Modified Magnetic Nanoparticles ◽  
Scanning Electron

A new magnetic nanoadsorbent was developed by treating Fe3O4 nanoparticles with 3-aminopropyltriethoxysilane and nickel(II) — metalloporphyrin, and applied to remove excessive nitrate from aqueous solutions. Fourier Transform Infrared Spectroscopy (FT-IR), X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM) were used to characterize the synthesized nanoparticles. The effect of pH, contact time, sorbent dosage and some co-existing anions present in aqueous solutions was investigated. Regeneration of nitrate adsorbed material was possible with NaOH , the modified magnetic nanoparticles exhibited good reusability.

Synthesis and characterization of polypyrrole/molybdenum oxide composite for ammonia vapour sensing at room temperature

2021 ◽  
pp. 096739112110365
Author(s):  
Mohd Urooj Shariq ◽  
Ahmad Husain ◽  
Mahfoozurrahman Khan ◽  
Anees Ahmad
Keyword(s):  
Electron Microscopy ◽  
Molybdenum Oxide ◽  
Room Temperature ◽  
X Ray Diffraction ◽  
X Ray ◽  
Oxide Composite ◽  
Ammonia Vapour ◽  
Ft Ir ◽  
Adsorption Desorption

In this study, polypyrrole (PPy) and polypyrrole/molybdenum oxide composite (PPy/MoO3) were synthesized by the chemical oxidative method in an aqueous medium, using anhydrous ferric chloride (FeCl3) as an oxidant. The successful preparation of materials was confirmed by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmittance electron microscopy (TEM). PPy and PPy/MoO3 were converted into pellets which were used as the sensor. A four-in-line probe device was used for studying DC electrical conductivity–based ammonia vapour–sensing properties at three different ammonia concentrations, that is, 1 M, 0.5 M and 0.1 M. The PPy/MoO3 sensor showed much-improved sensing performance than the PPy sensor in terms of % sensing response and reversibility. PPy/MoO3 sensor showed excellent selectivity for ammonia vapours against various VOCs. The % sensing response of PPy/MoO3 sensor towards ammonia was found to be 2.19, 2.50, 3.16, 3.87, 4.1, 5.15, 6.19, 6.55 and 7.77 times greater than ethanol, methanol, acetone, acetaldehyde, formaldehyde, toluene, benzene, chloroform and n-hexane, respectively. In the end, a sensing mechanism was also proposed, which is based on rapid adsorption–desorption of ammonia molecules on the PPy/MoO3 sensor’s surface.

scholarly journals Studi Adsorpsi-Desorpsi Anion Fosfat Pada Bentonit Termodifikasi CTAB

2020 ◽  
Vol 8 (2) ◽  
pp. 125-136
Author(s):  
Syarifah Rabiatul Adawiah ◽  
Sutarno Sutarno ◽  
Suyanta Suyanta
Keyword(s):  
Citric Acid ◽  
Optimum Condition ◽  
Adsorption Capacity ◽  
Contact Time ◽  
Slow Release ◽  
Phosphate Anion ◽  
X Ray ◽  
Slow Release Fertilizers ◽  
Ft Ir ◽  
Adsorption Desorption

Adsorption-desorption studies of phosphate on CTAB modified bentonite have been investigated. The results were characterized by FT-IR spectrometer to determine the functional groups in bentonite and X-ray diffractometer to determine the type of minerals in the bentonite. Adsorption was conducted by shaking 10 mg adsorbent in 5 mL adsorbate solution at the optimum condition of pH, contact time, and concentration. Furthermore, desorption studies were conducted on 5 mL medium of both water and citric acid 0.33 M and using 6.5 mg of adsorbent which has adsorbed phosphate. The results showed that the bentonite has been successfully modified with CTAB. The adsorption capacity of phosphate is 0.028 mmol g-1. Desorption studies showed that the solubility percentage of phosphate anion in citric acid was 0.33 M (73.33%) greater than in water (57.81%) which is a requirement for the use of slow-release fertilizers (SRF).

scholarly journals Synthesis, Characterization, and Catalytic Properties of Magnetic Fe3O4@FU: A Heterogeneous Nanostructured Mesoporous Bio-Based Catalyst for the Synthesis of Imidazole Derivatives

2020 ◽  
Vol 8 ◽  
Author(s):  
Maryam Banazadeh ◽  
Sara Amirnejat ◽  
Shahrzad Javanshir
Keyword(s):  
Electron Microscopy ◽  
Reaction Times ◽  
Sulfated Polysaccharide ◽  
X Ray Diffraction ◽  
Adsorption Method ◽  
Environmental Friendliness ◽  
X Ray ◽  
Transmission Electron ◽  
Ft Ir

In this protocol, Fucoidan (FU), a fucose-rich sulfated polysaccharide extracted from brown algae Fucus vesiculosus was used for in situ preparation of magnetic Fe3O4@FU. Nanoco magnetic properties of Fe3O4@FU were investigated by energy dispersive X-ray (EDX) spectroscopy, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), Brunauer–Emmett–Teller (BET) adsorption method, and vibrating sample magnetometer (VSM). The catalytic activity of Fe3O4@FU was employed for the synthesis of tri- and tetra-substituted imidazoles through three- and four-component reactions respectively, between benzyl, aldehydes, NH4OAc and benzyl, aldehydes, NH4OAc, and amine under reflux in ethanol. It is worth nothing that excellent yields, short reaction times, chromatography-free purification, and environmental friendliness are highlighted features of this protocol.

scholarly journals Effective TiO2-Sulfonated Carbon-derived from Eichhornia crassipes in The Removal of Methylene Blue and Congo Red Dyes from Aqueous Solution

2020 ◽  
Vol 15 (2) ◽  
pp. 476-489
Author(s):  
Iis Intan Widiyowati ◽  
Mukhamad Nurhadi ◽  
Muhammad Hatami ◽  
Lai Sin Yuan
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Congo Red ◽  
Contact Time ◽  
Eichhornia Crassipes ◽  
Dye Removal ◽  
Nitrogen Adsorption ◽  
Order Kinetic ◽  
X Ray ◽  
Removal Capacity

The study of TiO2-sulfonated carbon-derived from Eichhornia crassipes (TiO2/SCEC), as an effective adsorbent to remove Methylene blue (MB) and Congo red (CR) dyes from aqueous solution, has been conducted. The preparation steps of TiO2/SCEC adsorbent involved the carbonisation of E. crassipes powder at 600 °C for 1 h, followed by sulfonation of carbon for 3 h and impregnation through titanium(IV) isopropoxide (500 µmol). The physical properties of the adsorbents were characterized by using X-ray fluorescence (XRF), Fourier transform infrared, X-ray diffraction (XRD), Scanning electron microscopy with Energy dispersive X-ray (SEM-EDX), Thermogravimetric analysis (TGA) and nitrogen adsorption-desorption studies. The dye removal study using TiO2/SCEC adsorbent was carried out by varying of contact time, adsorbent dosage, initial dye concentration, pH, particles size of adsorbent and temperature. The kinetics models were determined by the effects of contact time and the thermodynamic parameters (ΔH, ΔS, and ΔG), which were calculated by the effects of temperature. The results showed that the maximum dye removal capacity of TiO2/SCEC were 18.8 mg.g-1 for MB and 36.5 mg.g-1 for CR. The removal of MB and CR dyes using TiO2/SCEC adsorbent performed a pseudo-second order kinetic models with spontaneity. Copyright © 2020 BCREC Group. All rights reserved 

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