Preparation of a biosorbent complex (clay particles/Streptococcus thermophilus) to treat polluted water with methylene blue

AbstractMethylene blue (MB) has been used as a probe molecule to examine how the uptake dynamics and the equilibria between this dye and the surface of Na+- and H+- montmorillonite were affected by the presence of a second dye. To prevent spectral interference, the yellow dyes thioflavin T, TFT, proflavine, PFH, and acridine yellow, ACY, were chosen to compete with MB for the exchange sites. The MB was initially adsorbed as trimer (MB+)3 and then redistributed via collisions between clay particles until equilibrium was reached. At equilibrium in the clay/MB systems, the protonated species (MBH2+) predominated at low loadings (1–5% CEC), whereas at higher loadings the trimer (MB+)3 was the major species. The presence of the second, competing dye slowed the approach to equilibrium, significantly reduced the amount of MBH2+ formed and provided evidence for the monomeric MB+, dimeric (MB+)2, and trimeric (MB+)3 forms of MB. Moreover, the presence of PFH and ACY, which are structurally similar to MB, resulted in more dimeric character in the aggregated form of MB compared to the aggregate formed in the presence of the structurally dissimilar TFT.

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Adding value to natural clays as low-cost adsorbents of methylene blue in polluted water through honeycomb monoliths manufacture

SN Applied Sciences ◽

10.1007/s42452-019-1636-4 ◽

2019 ◽

Vol 1 (12) ◽

Cited By ~ 1

Author(s):

M. Ahrouch ◽

J. M. Gatica ◽

K. Draoui ◽

H. Vidal

Keyword(s):

Methylene Blue ◽

Low Cost ◽

Polluted Water ◽

Natural Clays

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Synthesis and evaluation of the methylene blue removal ability of Cu2O nanoparticles/TiO2 nanotubes heterostructure

Science and Technology Development Journal - Natural Sciences ◽

10.32508/stdjns.v1it4.498 ◽

2017 ◽

Vol 1 (T4) ◽

pp. 115-122

Author(s):

Viet Van Pham ◽

Trung Chanh Nguyen ◽

Hieu Van Le ◽

Thi Minh Cao

Keyword(s):

Methylene Blue ◽

Photoelectron Spectroscopy ◽

Tio2 Nanotubes ◽

Polluted Water ◽

Xps Spectra ◽

X Ray ◽

Transmission Electron ◽

Cu2o Nanoparticles ◽

Condition Characteristic ◽

Toxic Organic Substances

Cu2O nanoparticles loaded TiO2 nanotubes (Cu2O/TNTs) were synthesized by photoreduction method for the enhancement of photocatalyst activity of TNTs under sunlight condition. Characteristic properties of these materials were determined by X-ray photoelectron spectroscopy (XPS), Transmission electron microscopy (TEM) images and Energy-dispersive X-ray spectroscopy (EDX). XPS spectra confirmed the existence of Cu2O nanoparticles in the sample. The photocatalytic activity of Cu2O/TNTs was evaluated by the survey of the removal of methylene blue (MB) solution under direct sunlight condition. The discoloration of MB solution by Cu2O/TNTs was faster and better than by TNTs after 30 minute – irradiation. The MB removal efficiency of Cu2O/TNTs was up to 89.7 % with the above condition. The results of this study demonstrated that this material for the treatment of the toxic organic substances in the polluted water poses extremely potentials.

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Environmentally Friendly Polyvinyl alcohol−alginate/bentonite Nanocomposite Hydrogel Beads as Efficient Adsorbents for Removal of Toxic Methylene Blue from Aqueous Solution

10.20944/preprints202111.0149.v1 ◽

2021 ◽

Author(s):

Mona A. Aziz Aljar ◽

Suad Rashdan ◽

Ahmed Abd El-Fattah

Keyword(s):

Methylene Blue ◽

Polyvinyl Alcohol ◽

Organic Dyes ◽

Research Work ◽

Polluted Water ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Nanocomposite Hydrogel ◽

Homogeneous Surface ◽

Hydrogel Beads

Hazardous chemicals like toxic organic dyes are very harmful to the environment and their removal is quite challenging. Therefore there is a necessity to develop techniques, which are environment friendly, cost-effective and easily available in nature for water purification and re-mediation. The present research work is focused on the development` and characterization of the ecofriendly polyvinyl alcohol (PVA) and alginate (Alg) hydrogel beads incorporating natural bentonite (Bent) clay as beneficial adsorbents for removal of toxic methylene blue (MB) from industrial water. PVA−Alg/Bent nanocomposite hydrogel beads with different Bent content (0, 10, 20, and 30 wt%) were synthesized via external ionic gelation method. The designed porous and steady structure beads were characterized by the use of Fourier transform infrared spectroscopy (FTIR), energy-dispersive X-ray spectroscopy (EDX), and scanning electron microscopy (SEM). The performance of the beads as MB adsorbents was investigated by treating batch aqueous solutions. The experimental results indicated that the incorporation of Bent (30 w%) in the nanocomposite formulation sustained porous structure, preserved water uptake, and increased MB removal effi-ciency by 230 % compared to empty beads. Designed beads possessed higher aﬃnity to MB at high pH 8, 30 °C, and ﬁtted well to pseudo-second-order kinetic model a high correlation coeﬃcient. Moreover, designed beads had a good stability and reusability as they exhibited excellent removal eﬃciency (90%) after six consecutive adsorption-desorption cycles. Adsorption process was found be combination of both monolayer adsorption on homogeneous surface and multilayer adsorption on heterogeneous surface. The maximum adsorption capacity of the designed beads system as calculated by Langmuir isotherm was found to be 51.34 mg/g, which is in good agreement with the reported clay-related adsorbents. The designed PVA−Alg/Bent nanocomposite hydrogel beads demonstrated good adsorbent properties and could be potentially used for MB removal from polluted water.

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Mesoporous Spongy Ni-Co-Oxides@Wheat Straw-Derived SiO2 For Adsorption And Photocatalytic Degradation of Methylene Blue Pollutants

10.21203/rs.3.rs-780301/v1 ◽

2021 ◽

Author(s):

Mohamed A. T. Hussein ◽

Mohamed M Motawea ◽

Mohamed M. Elsenety ◽

Salah M. El-Bahy ◽

Hassanien Gomaa

Keyword(s):

Methylene Blue ◽

Photocatalytic Degradation ◽

Wheat Straw ◽

Agricultural Waste ◽

Nitrogen Adsorption ◽

Cost Effective ◽

Polluted Water ◽

Isotherm Models ◽

Cobalt Oxides ◽

Computational Calculations

Abstract The exploitation and employment of agricultural waste in polluted water treatment is one of the most important cost-effective approaches. Therefore, a novel mesoporous spongy adsorbent/photocatalyst was successfully synthesized through the grafting of nickel and cobalt oxides nanocomposites with wheat straw-derived SiO2. Nickel and cobalt oxides were added to enhance the functionality of wheat straw-derived SiO2. This synthesis methodology presents a simplistic, cost-effective, and eco-approachable alternative to getting an adsorbent and photocatalyst for the adsorption and photocatalytic degradation of methylene blue (MB) pollutants from wastewater. The modified wheat straw-derived SiO2 (MWSS) was characterized via XRD, SEM, EDX, TGA, FTIR, and nitrogen adsorption. Molecular dynamics computational calculations were performed to comprehend the ability of methylene blue to adjust the WSDS surface. The experiments of adsorption and photodegradation trials were performed to optimize the pH, contact time, initial MB-concentration, and temperature parameters. Furthermore, kinetics and isotherm models were checked to explain the MB-removal mechanism using mesoporous spongy MWSS. The current work indicated that the mesoporous MWSS adsorbent/photocatalyst provided efficient adsorption capability (79%), significant photocatalytic performance (93%), and higher solidity during reusability as well. This study suggests an efficient composite that contributes to getting rid of the MB pollutants from wastewater.

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Utilization of Jackfruit Peel as a Low-Cost adsorbent for the Removal of Methylene Blue Dye from Synthetically Polluted Water

Current Analytical Chemistry ◽

10.2174/1573411016666200203153318 ◽

2020 ◽

Vol 16 ◽

Author(s):

Mohsina Ahmed ◽

Abu Nasar

Keyword(s):

Methylene Blue ◽

Low Cost ◽

Aqueous Media ◽

Polluted Water ◽

Blue Dye ◽

Batch Adsorption ◽

Contaminated Water ◽

Abrupt Increase ◽

Agriculture Waste ◽

Pseudo Second Order

Background: Due to an abrupt increase in the contamination of freshwater systems by dye-containing wastewater, there is an urgent need to find robust and greener adsorbents for the elimination of dyes from the contaminated water. As the dyes not only change the appearance of water but are also a cause of many serious problems, which can be some time mutagenic and carcinogenic. Methods: This research paper is based on the use of adsorbent made from the peel of jackfruit (POJ). The adsorbent derived from agriculture waste was low cost and efficient for the elimination of methylene blue (MB) dye from aqueous media. Batch adsorption experiments were accompanied by varying the pH of the solution, contact time, POJ dosage, and initial MB concentration. Results: It was seen that adsorption of MB onto Jackfruit peel adsorbent follows pseudo-second-order (PSO) kinetics and Langmuir isotherm with maximum biosorption capacity (qm) of 232.55 mg/g. The thermodynamic study revealed that the adsorption was spontaneous, endothermic, and associated with the rise in entropy. Conclusion: In view of the low-cost and promising adsorption efficiency, the present investigation submits that that POJ is novel and economically feasible adsorbent for the removal of MB from aqueous solutions.

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