The Effect of Ionic Charge on the Adsorption of Organic Dyes onto Titanate Nanotubes

The adsorption of dye molecules from aqueous solution onto the surface of titanate nanotubes (which have been synthesized via an alkaline hydrothermal treatment) has been studied. The ionic charge on the dye molecules was found to affect their ability to adsorb onto the titanate nanotube surface. In the case of (cationic) methylene blue, the adsorption was preferable on the negatively charged surface of titanate nanotubes rather than on positively charged P25 TiO2 nanoparticles. In the case of (anionic) Eriochrome Black T dye, the opposite trend was found. Herein, the dynamics of dye adsorption and the effect of pH on the adsorption capacity are considered.

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Study on the adsorption of methylene blue from aqueous solution using hydrogel glucomannan/graphene oxide

Vietnam Journal of Catalysis and Adsorption ◽

10.51316/jca.2021.010 ◽

2021 ◽

Vol 10 (1) ◽

pp. 59-66

Author(s):

Son Le Lam ◽

Phu Nguyen Vinh ◽

Hieu Le Trung ◽

Tan Le Thua ◽

Nhan Dang Thi Thanh ◽

...

Keyword(s):

Aqueous Solution ◽

Methylene Blue ◽

Graphene Oxide ◽

Adsorption Capacity ◽

Organic Dyes ◽

Dye Adsorption ◽

Order Kinetic ◽

Equilibrium Data ◽

Order Kinetic Model ◽

Pseudo Second Order

Glucomannan/graphene oxide (GM/GO) hydrogel was synthesized by using calcium hydroxide as the crosslinker. The synthesized material was characterized by using IR, XRD, SEM, EDX and RAMAN technology. The composite hydrogel was used for removal of organic dyes from aqueous solution. The results showed that the GM/GO hydrogel had a porous structure and a high adsorption capacity toward methylene blue (MB). The pseudo-second-order kinetic model could fit the rate equation of MB adsorption onto the GM/GO hydrogel. The adsorption of MB onto GM/GO hydrogel was a spontaneous process. In addition, the equilibrium adsorption isotherm data indicated that equilibrium data were fitted to the Langmuir isotherm and the maximum dye adsorption capacity was 198,69 mg.g-1. Moreover, the hydrogel was stable and easily recovered and adsorption capacity was around 97% of the initial saturation adsorption capacity after being used five times.

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MODELING AND EXPERIMENTAL RESEARCH OF THE PROCESSES OF FORMATION OF RADIATION DAMAGE IN THE INTERACTION OF GAMMA QUANTUM FLOWS AND RELATIVISTIC ELECTRON BEAMS WITH SOLUTIONS OF ORGANIC DYES

10.46813/2021-136-042 ◽

2021 ◽

pp. 42-45

Author(s):

S.P. Gokov ◽

Yu.G. Kazarinov ◽

S.A. Kalenik ◽

V.Y. Kasilov ◽

V.V. Kantemirov ◽

...

Keyword(s):

Experimental Data ◽

Aqueous Solution ◽

Methylene Blue ◽

Experimental Research ◽

Organic Dyes ◽

Electron Beams ◽

Gamma Quantum ◽

Organic Dye ◽

Dye Molecules ◽

Relativistic Electron Beams

The processes of interaction of an aqueous solution of an organic dye: methylene blue (MB)  C16H18N3SCl with gamma quanta and electrons were investigated. A model has been developed and the passage of electrons with an energy of 15 MeV through tungsten layers with a thickness of 1…8 mm has been simulated. Based on the simula-tion results, a number of experiments were carried out. Analysis of the calculated and experimental data showed that one incident electron destroys 4 times more dye molecules than one incident gamma quantum.

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Adsorptive removal of organic dyes from aqueous solution by a Zr-based metal–organic framework: effects of Ce(iii) doping

Dalton Transactions ◽

10.1039/c8dt00217g ◽

2018 ◽

Vol 47 (11) ◽

pp. 3913-3920 ◽

Cited By ~ 66

Author(s):

Ji-Min Yang ◽

Rong-Jian Ying ◽

Chun-Xiang Han ◽

Qi-Tu Hu ◽

Hui-Min Xu ◽

...

Keyword(s):

Aqueous Solution ◽

High Stability ◽

Organic Dyes ◽

Metal Organic Framework ◽

Dye Adsorption ◽

Adsorptive Removal ◽

Adsorption Performance ◽

Metal Organic ◽

Organic Framework

Ce(iii)-doped UiO-66 nanocrystals exhibited better dye adsorption performance than pristine UiO-66, showing the advantages of high stability and excellent porosity.

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Parameters Affecting Dye Adsorption - Using Graphene Coated Sand (GSC)

International Journal of Science and Engineering Invention ◽

10.23958/ijsei/vol04-i02/01 ◽

2018 ◽

Vol 4 (02) ◽

Author(s):

Seroor Atalah Khaleefa Alia ◽

Dr. Mohammed Ibrahimb ◽

Hussein Ali Hussein

Keyword(s):

Heavy Metals ◽

Contact Time ◽

Organic Dyes ◽

Low Cost ◽

Dye Adsorption ◽

Contaminated Water ◽

Maximum Adsorption Capacity ◽

Engineering Designs ◽

Heavy Metals Ions ◽

Coated Sand

Adsorption is most commonly applied process for the removal of pollutants such as dyes and heavy metals ions from wastewater. The present work talks about preparing graphenic material attached sand grains called graphene sand composite (GSC) by using ordinary sugar as a carbon source. Physical morphology and chemical composition of GSC was examined by using (FTIR, SEM, EDAX and XRD). Efficiency of GSC in the adsorption of organic dyes from water was investigated using reactive green dye with different parameters such as (ph, temperature, contact time and dose). Adsorption isotherm was also studied and the results showed that the maximum adsorption capacity of dye is 28.98 mg/g. This fast, low-cost process can be used to manufacture commercial filters to treat contaminated water using appropriate engineering designs.

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Chitosan/Zeolite Composite Aerogels for a Fast and Effective Removal of Both Anionic and Cationic Dyes from Water

Polymers ◽

10.3390/polym13111691 ◽

2021 ◽

Vol 13 (11) ◽

pp. 1691

Author(s):

Angela Marotta ◽

Enrica Luzzi ◽

Martina Salzano de Luna ◽

Paolo Aprea ◽

Veronica Ambrogi ◽

...

Keyword(s):

Aqueous Solution ◽

Broad Spectrum ◽

Organic Dyes ◽

Indigo Carmine ◽

Zeolite 13X ◽

Industrial Sectors ◽

Effective Removal ◽

Composite Aerogels ◽

Zeolite Composite ◽

Adsorption Desorption

Organic dyes are extensively used in many industrial sectors, and their uncontrolled disposal into wastewaters raises serious concerns for environmental and human health. Due to the large variety of such pollutants, an effective remediation strategy should be characterized by a broad-spectrum efficacy. A promising strategy is represented by the combination of different adsorbent materials with complementary functionalities to develop composite materials that are expected to remove different contaminants. In the present work, a broad-spectrum adsorbent was developed by embedding zeolite 13X powder (ZX) in a chitosan (CS) aerogel (1:1 by weight). The CS–ZX composite adsorbent removes both anionic (indigo carmine, IC) and cationic (methylene blue, MB) dyes effectively, with a maximum uptake capacity of 221 mg/g and 108 mg/g, respectively. In addition, the adsorption kinetics are rather fast, with equilibrium conditions attained in less than 2 h. The composite exhibits good mechanical properties in both dry and wet state, which enables its handling for reusability purposes. In this regard, preliminary tests show that the full restoration of the IC removal ability over three adsorption–desorption cycles is achieved using a 0.1 M NaOH aqueous solution, while a 1 M NaCl aqueous solution allows one to preserve >60% of the MB removal ability.

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Ultrasound-irradiated synthesis of 3-mercaptopropyl trimethoxysilane-modified hydroxyapatite derived from fish-scale residues followed by ultrasound-assisted organic dyes removal

Scientific Reports ◽

10.1038/s41598-021-85206-5 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Phitchan Sricharoen ◽

Supalak Kongsri ◽

Chunyapuk Kukusamude ◽

Yonrapach Areerob ◽

Prawit Nuengmatcha ◽

...

Keyword(s):

Electron Microscopy ◽

Textile Industry ◽

Organic Dyes ◽

Dye Adsorption ◽

Ultrasound Irradiation ◽

Coefficient Of Determination ◽

Fish Scale ◽

Transmission Electron ◽

Endothermic Process ◽

Langmuir Isotherm Model

AbstractWe report a novel method for the synthesis of 3-mercaptopropyl trimethoxysilane-modified hydroxyapatite (FHAP-SH) derived from fish-scale residues by using ultrasound irradiation. Scanning electron microscopy, transmission electron microscopy, energy-dispersive spectroscopy, X-ray diffraction, and Fourier transform infrared spectroscopy were used for the FHAP-SH characterization. Then, the organic dye adsorption on the FHAP-SH was monitored through an ultrasound process. After the dye removal optimization, significant improvements were observed in the maximum adsorption capacities for Congo Red (CR, 500 mg g−1), Coomassie Brilliant Blue G 250 (CB, 235 mg g−1), and Malachite Green (MG, 625 mg g−1). The adsorption behaviors of these dyes were fitted by using the Langmuir isotherm model with a high coefficient of determination values ranging from 0.9985 to 0.9969. The adsorption of the three dyes onto FHAP-SH was an endothermic process based on the adsorption thermodynamics model, while the adsorption kinetics analysis of the dyes presented a good alignment with the pseudo-second-order kinetics. The FHAP-SH exhibits a remarkably high adsorption capacity, is inexpensive, and fulfills the ecofriendly requirements of dye wastewater treatment, especially in the textile industry.

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