Removal of methylene blue from aqueous system using tobacco stems biomass: Kinetics, mechanism and single-stage adsorber design

2017 ◽  
Vol 36 (4) ◽  
pp. 1005-1012 ◽  
Author(s):  
D. Damodar Reddy ◽  
Rakesh Kumar Ghosh ◽  
J. Poorna Bindu ◽  
M. Mahadevaswamy ◽  
T.G.K. Murthy
Keyword(s):  
Methylene Blue ◽  
Aqueous System ◽  
Single Stage

Cationic dye adsorption and separation at discrete molecular level: first example of an iron cluster with rapid and selective adsorption of methylene blue from aqueous system

2021 ◽  
Author(s):  
Muhammad Nadeem Akhtar ◽  
Mantasha I. ◽  
M. Shahid ◽  
Murad A. AlDamen ◽  
Muhammad Khalid ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Molecular Level ◽  
Selective Adsorption ◽  
Dye Adsorption ◽  
Aqueous System ◽  
Contaminated Water ◽  
Cationic Dye ◽  
Functional Material ◽  
Iron Cluster ◽  
System P

A novel Fe6 cluster was designed as a rare example of any discrete molecule as a highly efficient, selective and rapid functional material for the adsorption of cationic dyes, i.e. methylene blue (MB), from contaminated water bodies.

Sonochemical Degradation of Methylene Blue and P-Nitrophenol in Aqueous Medium

2011 ◽  
Vol 9 (1) ◽  
Author(s):  
Rajanandam K. S ◽  
Madhu G.M ◽  
Ashly Thomas
Keyword(s):  
Methylene Blue ◽  
Azo Dyes ◽  
Biological Treatment ◽  
Degradation Rate ◽  
Chemical Oxidation ◽  
Aqueous System ◽  
Aqueous Streams ◽  
Degradation Of Dyes ◽  
Increase With Increase ◽  
Physico Chemical

The presence of dyes in aqueous system causes aesthetic pollution, hydrolysis or other chemical reactions leading to the formation of products which are non degradable, and accumulate in water. A number of methods have been devised for degradation of dyes in aqueous streams which can cater to the never ending necessities of water worldwide. The methods include biological treatment, chemical oxidation, electrochemical decomposition, photocatalytic and chemical coagulation, physical and physico-chemical treatment. These methods are successful to a certain extent. In the present work, an attempt was made towards the sonochemical degradation of azo dyes such as methylene blue and p-nitro phenol. Further sonication experiments were carried out in combination with advanced oxidation processes. Sonication was performed at 20 and 70 kW power ratings. Percentage degradation was found to increase with increase in power ratings. Degradation of azo dyes was improved in presence UV source. Maximum degradation was observed when sonication was carried out in presence of UV source and hydrogen peroxide which was used as an oxidant. Increase in dye concentration decreased degradation rate and decrease in pH (acid medium) increased the degradation rate.

scholarly journals Preparation, Characterization, and Application of Metakaolin-Based Geopolymer for Removal of Methylene Blue from Aqueous Solution

2019 ◽  
Vol 2019 ◽  
pp. 1-14 ◽  
Author(s):  
Marouane El Alouani ◽  
Saliha Alehyen ◽  
Mohammed El Achouri ◽  
M’hamed Taibi
Keyword(s):  
Methylene Blue ◽  
Aqueous System ◽  
Second Order ◽  
Point Of Zero Charge ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
X Ray ◽  
Endothermic Process ◽  
Pseudo Second Order ◽  
Edx Analyses

Metakaolin-based geopolymers are aluminosilicate materials that can be used as cationic dye adsorbents in aqueous system treatment. Our aim in this paper is to study the ability of geopolymer powder produced from metakaolin and alkaline activators to act as an adsorbent to remove methylene blue (MB). The solid materials were systematically analyzed by X-ray fluorescence (XRF), X-ray diffraction (XRD), Fourier-transform infrared spectrometery (FTIR), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), and the point of zero charge. XRF, FTIR, XRD, SEM, and EDX analyses confirmed the formation of a geopolymer composite by geopolymerization reaction. The influence of various experimental factors such as geopolymer dosage, pH, initial dye concentration, contact time, and temperature was assessed. Adsorption isotherms were evaluated by Langmuir, Freundlich, Temkin, and Dubinin–Radushkevich isotherms. Kinetics data were studied using pseudo-first-order, pseudo-second-order, and intraparticle diffusion models. The thermodynamic parameters, namely, Gibbs free energy (ΔG°), enthalpy (ΔH°), and entropy (ΔS°), were determined. The results indicated that the maximum decolorization was found in high pH values. The collected isotherm data were best fitted by the Langmuir isotherm, and the maximum adsorption capacity of dye onto the geopolymer was 43.48 mg/g. The experiment kinetics followed the pseudo-second-order kinetic models. The thermodynamic results demonstrated that the adsorption of the obtained material occurs spontaneously as an endothermic process. The results confirmed that the prepared adsorbent can be used for remediation of water contaminated by MB dye.

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