Preparation of a porous, magnetic, quaternary chitosan salt by preadsorption and desorption for azo dye adsorption from water

2016 ◽  
Vol 133 (20) ◽  
pp. n/a-n/a ◽  
Author(s):  
Conglu Zhang ◽  
Lei Zhu ◽  
Wei Li ◽  
Xin Zheng
Keyword(s):  
Azo Dye ◽  
Dye Adsorption ◽  
Chitosan Salt

scholarly journals Decolorization of Orange-G Aqueous Solutions over C60/MCM-41 Photocatalysts

2019 ◽  
Vol 9 (9) ◽  
pp. 1958 ◽  
Author(s):  
John Kyriakopoulos ◽  
Eleana Kordouli ◽  
Kyriakos Bourikas ◽  
Christos Kordulis ◽  
Alexis Lycourghiotis
Keyword(s):  
Ascorbic Acid ◽  
Azo Dye ◽  
Dye Degradation ◽  
Dye Adsorption ◽  
Fullerene C60 ◽  
Ordered Mesoporous Silica ◽  
Semiconducting Materials ◽  
Ordered Mesoporous ◽  
Orange G ◽  
Mcm 41

The majority of the photocatalysts studied for azo-dye degradation are based on semiconductor materials. Studies reported on non-semiconducting materials are very scarce. In the present work, we studied the fullerene (C60) ability to accelerate photodegradation of the dye’s azo bond in the presence of ascorbic acid. A series of C60 supported on ordered mesoporous silica (MCM-41) catalysts, containing 1, 3, 6, 9, and 12 wt % of fullerene C60, was studied using Orange G (OG) as representative azo-dye. This study showed that partial decolorization is achieved in the dark by simple adsorption of the dye on the bare surface of the carrier. The extent of decolorization increases with the irradiation of the suspension due to photocatalytic degradation of the azo-bond. This is maximized over the sample containing 3 wt % of C60 and it has been attributed to the best combination of the extent of the dye adsorption with the high intrinsic photocatalytic activity of small C60 clusters predominated in this sample. This catalyst proved to be quite stable upon five subsequent photocatalytic cycles, losing less than 5% of its initial activity. No degradation of OG takes place in the absence of ascorbic acid.

Azo dye adsorption on an industrial waste-transformed hydroxyapatite adsorbent: Kinetics, isotherms, mechanism and regeneration studies

2020 ◽  
Vol 8 (3) ◽  
pp. 103807 ◽  
Author(s):  
Hiba Bensalah ◽  
Saad Alami Younssi ◽  
Mohamed Ouammou ◽  
Aleksander Gurlo ◽  
Maged F. Bekheet
Keyword(s):  
Industrial Waste ◽  
Azo Dye ◽  
Dye Adsorption

Structure-Affinity Modeling of Azo Dye Adsorption on Cellulose Fibre by MLR

2008 ◽  
Author(s):  
Simona Funar-Timofei ◽  
Ludovic Kuruntzi ◽  
Walter Fabian ◽  
Daniela Ionescu
Keyword(s):  
Azo Dye ◽  
Dye Adsorption ◽  
Cellulose Fibre

scholarly journals Short- and long-term orange dye effects on ammonium oxidizing and anammox bacteria activities

2017 ◽  
Vol 76 (1) ◽  
pp. 79-86 ◽  
Author(s):  
A. Val del Río ◽  
A. Stachurski ◽  
R. Méndez ◽  
J. L. Campos ◽  
J. Surmacz-Górska ◽  
...  
Keyword(s):  
Azo Dye ◽  
Specific Activity ◽  
Dye Adsorption ◽  
Anammox Bacteria ◽  
Ammonia Oxidizing Bacteria ◽  
Continuous Stirred Tank Reactor ◽  
Partial Nitritation ◽  
Anammox Activity ◽  
Anammox Process

The effects of orange azo dye over ammonia oxidizing bacteria (AOB) and anammox bacteria activities were tested. Performed batch tests indicated that concentrations lower than 650 mgorange/L stimulated AOB activity, while anammox bacteria activity was inhibited at concentrations higher than 25 mgorange/L. Long-term performance of a continuous stirred tank reactor (CSTR) for the partial nitritation and a sequencing batch reactor (SBR) for the anammox process was tested in the presence of 50 mgorange/L. In the case of the partial nitritation process, both the biomass concentration and the specific AOB activity increased after 50 days of orange azo dye addition. Regarding the anammox process, specific activity decreased down to 58% after 12 days of operation with continuous feeding of 50 mgorange/L. However, the anammox activity was completely recovered only 54 days after stopping the dye addition in the feeding. Once the biomass was saturated the azo dye adsorption onto the biomass was insignificant in the CSTR for the partial nitritation process fed with 50 mgorange/L. However, in the SBR the absorption was determined as 6.4 mgorange/g volatile suspended solids. No biological decolorization was observed in both processes.

scholarly journals Abatement of Azo Dye from Wastewater Using Bimetal-Chitosan

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Ghorban Asgari ◽  
Bahman Ramavandi ◽  
Sima Farjadfard
Keyword(s):  
Experimental Data ◽  
Azo Dye ◽  
Dye Adsorption ◽  
Maximum Adsorption Capacity ◽  
Orange Ii ◽  
Dye Wastewater ◽  
Effects Of Ph ◽  
Pseudo Second Order ◽  
Time Required ◽  
Best Fit

We introduce a new adsorbent, bimetallic chitosan particle (BCP) that is successfully synthesized and applied to remove the orange II dye from wastewater. The effects of pH, BCP quantity, and contact time are initially verified on the basis of the percentage of orange II removed from the wastewater. Experimental data reveal that the Cu/Mg bimetal and chitosan have a synergistic effect on the adsorption process of the adsorbate, where the dye adsorption by Cu/Mg bimetal, chitosan alone, and bimetal-chitosan is 10, 49, and 99.5%, respectively. The time required for the complete decolorization of orange II by 1 mg/L of BCP is 10 min. The Langmuir model is the best fit for the experimental data, which attains a maximum adsorption capacity of 384.6 mg/g. The consideration of the kinetic behavior indicates that the adsorption of orange II onto the BCP fits best with the pseudo-second-order and Elovich models. Further, the simulated azo dye wastewater can be effectively treated using a relatively low quantity of the adsorbent, 1 mg/L, within a short reaction time of 20 min. Overall, the use of BCP can be considered a promising method for eliminating the azo dye from wastewater effectively.

Treatment of Model Wastewater Including Eriochrome Black T Based on Eggshell Membrane

2011 ◽  
Vol 183-185 ◽  
pp. 2120-2123 ◽  
Author(s):  
Tao Liu
Keyword(s):  
Azo Dye ◽  
Acidic Solution ◽  
Ph Value ◽  
Dye Adsorption ◽  
Water Soluble ◽  
Eggshell Membrane ◽  
Dye Wastewater ◽  
Optimum Conditions ◽  
Eriochrome Black T ◽  
Pollution Problem

The adsorption and decolorization of water-soluble azo dye(Eriochrome Black T) was investigated based on eggshell membrane. The effect of adsorption time, pH value, temperature as well as the dosage of eggshell membrane on the decolorization of Eriochrome Black T was studied. It is indicated from the experimental results that the azo-dye adsorption with eggshell membrane should be carried out in acidic solution. At the optimum conditions, 95% of Eriochrome Black T could be removed. In this study, the dumped eggshell membrane can be utilized to solve the pollution problem of dye wastewater, which will offer us a new way for utilization of eggshell membrane and treatment of wastewater.

Facile one-pot in-situ synthesis of novel graphene oxide-cellulose nanocomposite for enhanced azo dye adsorption at optimized conditions

2020 ◽  
Vol 246 ◽  
pp. 116661 ◽  
Author(s):  
Aisha Zaman ◽  
Jonathan Tersur Orasugh ◽  
Priya Banerjee ◽  
Soumyadip Dutta ◽  
Mir Sahidul Ali ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Azo Dye ◽  
Dye Adsorption ◽  
In Situ Synthesis ◽  
One Pot ◽  
Optimized Conditions

Photocatalytic Degradation of C.I. Reactive Red 2 on the Mixture of TiO2 and HZSM-5 Zeolite

2011 ◽  
Vol 213 ◽  
pp. 1-4
Author(s):  
Li Li ◽  
Bo Yang ◽  
Wen Jie Zhang
Keyword(s):  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Azo Dye ◽  
Adsorption Equilibrium ◽  
Dye Adsorption ◽  
Tio2 Surface ◽  
Reactive Red 2 ◽  
Uv C ◽  
Addition Amount ◽  
Decoloration Rate

A mixture of TiO2 and HZSM-5 zeolite was used for photocatalytic degradation of an azo dye, C.I. Reactive Red 2(RR2). The adsorption of RR2 on TiO2 and the effect of TiO2 concentration were studied. HZSM-5 addition was also investigated to ascertain the function of the zeolite on RR2 decoloration. The results show that, the azo dye is quite stable under exposure of UV-C light. Less than 1.7% of the dye was adsorbed on TiO2 surface and 20 min was needed to reach dye adsorption equilibrium. The optimum TiO2 concentration was 320 mg/l. RR2 adsorption rate increased to more than 40% when HZSM-5 addition amount increased to 0.6 g in the solution. The total decoloration rate increased with the addition of HZSM-5 although zeolite addition could not enhance photocatalytic activity of TiO2.

Preparation, characterisation of thermally treated Algerian dolomite powders and application to azo-dye adsorption

2010 ◽  
Vol 201 (3) ◽  
pp. 277-282 ◽  
Author(s):  
Fatima Boucif ◽  
Kheira Marouf-Khelifa ◽  
Isabelle Batonneau-Gener ◽  
Jacques Schott ◽  
Amine Khelifa
Keyword(s):  
Azo Dye ◽  
Dye Adsorption ◽  
Thermally Treated

scholarly journals Adsorptive Removal of Anionic Azo Dye New Coccine Using Silica and Silica-gel with Surface Modification by Polycation

Polymers ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1536
Author(s):  
Tien Duc Pham ◽  
Viet Phuong Bui ◽  
Thuy Nga Pham ◽  
Thi Mai Dung Le ◽  
Kim Thuy Nguyen ◽  
...  
Keyword(s):  
Silica Gel ◽  
Adsorption Isotherms ◽  
Azo Dye ◽  
Dye Adsorption ◽  
Surface Group ◽  
Modified Silica ◽  
Modified Silica Gel ◽  
As Adsorption ◽  
Langmuir And Freundlich Models ◽  
Positively Charged

In the present work, adsorption of anionic azo dye, new coccine (NCC) on silica and silica-gel in an aquatic environment was discovered. Effective conditions such as adsorption time, pH, the influence of dosage on NCC adsorption using strong polycation, poly-diallyl-dimethylammonium chloride (PDADMAC) modified silica (PMS) and PDADMAC modified silica-gel (PMSG) were systematically studied. The removal of NCC using PMS and PMSG were much higher than that using raw silica and silica-gel without PDADMAC in all pH ranges from 3 to 10. The adsorption of NCC onto PMS and PMSG was achieved maxima at the same conditions of contact time 30 min, pH 6. The optimum adsorbent dosages of PMS and PMSG for NCC removal were 10 and 20 mg·mL−1, respectively. Experimental results of NCC adsorption isotherms onto PMS and PMSG at different ionic strength were fitted by Langmuir and Freundlich models. The NCC removal efficiencies using PMS and PMSG were higher than 87%, indicating that PMS and PMSG are novel and reusable adsorbents for removal of anionic dye. Based on adsorption isotherms, and surface group changes after PDADMAC modification and NCC adsorption examined by Fourier transform infrared spectroscopy (FTIR), we demonstrate that electrostatic interaction between positively charged adsorbents’ surfaces and negative sulfonic groups of NCC are the main driving force for anionic azo dye adsorption onto PMS and PMGS adsorbents.

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