Removal of Azo Dyes from Aqueous Solution by Composite HKUST-1/GO

Nano LIFE ◽  
2015 ◽  
Vol 05 (03) ◽  
pp. 1542003 ◽  
Author(s):  
Qiong Yi ◽  
Ling Li ◽  
Lu Fan ◽  
Keke Sun ◽  
Lebao Mao ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Graphene Oxide ◽  
Adsorption Isotherm ◽  
Removal Efficiency ◽  
Adsorption Isotherms ◽  
Azo Dyes ◽  
Freundlich Isotherm ◽  
Dyes Removal

The adsorption of three kinds of azo dyes from aqueous solution on HKUST-1/graphene oxide (GO) composite was studied in view of the removal efficiency, adsorption isotherm, and regenerate of the sorbent. HKUST-1/GO was found to be with higher dyes removal efficiency than HKUST-1. All the adsorption isotherms of azo dyes on HKUST-1/GO composite followed Freundlich isotherm. The adsorbed azo dyes on HKUST-1/GO could be eluted by acetone, so HKUST-1/GO can also be used for enrichment of azo dyes as adsorbent.

Enhancement of azo dyes removal efficiency by using LDH/Tris/Pd catalyst: Kinetic studies

2019 ◽  
Vol 33 (8) ◽  
Author(s):  
Narges Sarmast ◽  
Ramin Ghorbani‐Vaghei ◽  
Zohreh Merati
Keyword(s):  
Removal Efficiency ◽  
Azo Dyes ◽  
Kinetic Studies ◽  
Pd Catalyst ◽  
Dyes Removal

scholarly journals Adsorption of As(V) from Aqueous Solution on Chitosan-Modified Diatomite

2020 ◽  
Vol 17 (2) ◽  
pp. 429 ◽  
Author(s):  
Qintao Yang ◽  
Liang Gong ◽  
Lili Huang ◽  
Qinglin Xie ◽  
Yijian Zhong ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Removal Efficiency ◽  
Ph Effect ◽  
Freundlich Isotherm ◽  
Xrd Analysis ◽  
Optimal Value ◽  
Equilibrium Data ◽  
Pseudo Second Order ◽  
Adsorption Desorption ◽  
Modified Diatomite

A novel chitosan (CS)-modified diatomite (Dt) was prepared by a simple mixture in the mass ratio to remove As(V) from aqueous solution in this research. The CS-modified Dt adsorbent was characterized by scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), and X-ray powder diffraction (XRD) analysis. The parameters to influence the adsorption of As(V) ion were studied under such conditions as kinetics, adsorption isotherm, and pH effect. The results revealed that adsorption of As(V) was initially rapid and the equilibrium time was reached after 40 min. The optimal value of the pH was 5.0 for better adsorption. The equilibrium data were well fitted to the Langmuir isotherm compared to the Freundlich isotherm, and exhibited the highest capacity and removal efficiency of 94.3% under an initial As(V) concentration of 5 mg/L. The kinetic data were well described by the pseudo-second-order model. In addition, 0.1 M NaOH has the best desorption efficiency of As(V) adsorbed on CS-modified Dt, and the removal efficiency of As(V) was still higher than 90% when after six adsorption-desorption cycles. These results showed that the CS-modified Dt could be considered as a potential adsorbent for the removal of As(V) in aqueous solution.

scholarly journals Removal of Reactive Dyes by Electro Coagulation Process from Aqueous Solution

2020 ◽  
Vol 26 (2) ◽  
pp. 14-28
Author(s):  
Zahraa A Sadoon ◽  
Mohanad J. M-Ridha
Keyword(s):  
Aqueous Solution ◽  
Removal Efficiency ◽  
Room Temperature ◽  
Reactive Dyes ◽  
Nacl Concentration ◽  
The World ◽  
Aluminum Electrodes ◽  
Electro Coagulation ◽  
The Impact ◽  
Dyes Removal

The presence of dyes in wastewater has become a major issue all over the world. The discharge of dyes in the environment is concerned for both toxicological and esthetical reasons. In this study, the removal of dyes from aqueous solution by electrocoagulation using aluminum electrodes as cathode and anode were investigated with the electrocoagulation cell of 1litter. The study included: the impact of various operating parameters on the dyes removal efficiency like pH, NaCl concentration, distance between electrodes, voltage, initial dyes concentration and type of electrodes. The dye (congo red) concentrations were (50, 100, 150, and 200 ppm), stirring speed was 120 rpm at room temperature. pH used was maintained constant. The impact of voltage values was chosen as 6, 10, and 14 Volts. On increasing voltage dyes, removals increased significantly. The higher removal efficiency of dyes (99.9%) was achieved at (30) minutes for (Al/Al) electrodes at pH 6.5-7 and voltage 14 Volts. The results showed that the best amount of sodium chloride was found to be 600 ppm in dyes, voltage of 14 Volts, and best gap between the electrodes as 0.5 cm.

scholarly journals Nano-TiO2, ultrasound and sequential nano-TiO2/ultrasonic degradation of N-acetyl-para-aminophenol from aqueous solution

2017 ◽  
Vol 15 (6) ◽  
pp. 1015-1027 ◽  
Author(s):  
Olushola S. Ayanda ◽  
Simphiwe M. Nelana ◽  
Leslie F. Petrik ◽  
Eliazer B. Naidoo
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Removal Efficiency ◽  
Treatment Process ◽  
Freundlich Isotherm ◽  
Attenuated Total Reflection ◽  
Order Kinetic ◽  
Nano Tio2 ◽  
Transmission Electron ◽  
Order Kinetic Model

Abstract The application of nano-TiO2 as adsorbent combined with ultrasound for the degradation of N-acetyl-para-aminophenol (AAP) from aqueous solution was investigated. The nano-TiO2 was characterized by means of powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), and attenuated total reflection–Fourier transform infrared spectroscopy (ATR-FTIR). Experimental results revealed that the adsorption of AAP by nano-TiO2 fitted the pseudo-second-order kinetic model, the equilibrium could be explained by the Freundlich isotherm and the treatment process is exothermic. The optimum removal efficiency of AAP (128.89 mg/g (77.33%)) was achieved at pH 4 when 0.03 g of nano-TiO2 was mixed with 50 mL of 100 mg/L AAP aqueous solution at ambient temperature, 60 min contact time, and a stirring speed of 120 rpm. Ultrasound at 20 kHz and pH 3 was favorable and it resulted in 52.61% and 57.43% removal efficiency with and without the addition of nano-TiO2, respectively. The degradation of AAP by ultrasound followed by nano-TiO2 treatment resulted in approximately 99.50% removal efficiency. This study showed that a sequential ultrasound and nano-TiO2 treatment process could be employed for the removal of AAP or other emerging water and wastewater contaminants.

Graphene Oxide Oxidized by NaClO as a Highly Effective Adsorbent for Fast Removal of Dye Rhodamine B

2013 ◽  
Vol 302 ◽  
pp. 223-226
Author(s):  
Jun Yong Chen ◽  
Yan Liu ◽  
Jia Jia Gou ◽  
Yong Mei Hao
Keyword(s):  
Waste Water ◽  
Aqueous Solution ◽  
Graphene Oxide ◽  
Removal Efficiency ◽  
Rhodamine B ◽  
Potential Application ◽  
Adsorption Equilibrium ◽  
Cationic Dye ◽  
Short Time ◽  
Fast Removal

The present paper reports a high effective adsorbent graphene oxide (GO) oxidized by NaClO. Its ability to separate cationic dye rhodamine (RhB) from aqueous solution was investigated. The adsorption of RhB onto GO can reach adsorption equilibrium within a short time, and the adsorbent exhibits excellent removal efficiency, which suggests its potential application value in removing dye from waste water.

Adsorption of azo dyes from aqueous solution by the hybrid MOFs/GO

2016 ◽  
Vol 73 (7) ◽  
pp. 1728-1737 ◽  
Author(s):  
Ling Li ◽  
Zhennan Shi ◽  
Hongyang Zhu ◽  
Wei Hong ◽  
Fengwei Xie ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Azo Dyes ◽  
Metal Organic Framework ◽  
Freundlich Isotherm ◽  
Order Kinetic ◽  
Sunset Yellow ◽  
Order Kinetic Model ◽  
Metal Organic ◽  
Pseudo Second Order ◽  
The Stability

In this work, a hybrid of chromium(III) terephthalate metal organic framework (MIL-101) and graphene oxide (GO) was synthesized and its performance in the removal of azo dyes (Amaranth, Sunset Yellow, and Carmine) from water was evaluated. The adsorption for azo dyes on MIL-101/GO was compared with that of MIL-101, and it was found that the addition of GO enhanced the stability of MIL-101 in water and increased the adsorption capacity. The maximum adsorption capacities of MIL-101/GO were 111.01 mg g−1 for Amaranth, 81.28 mg g−1 for Sunset Yellow, and 77.61 mg g−1 for Carmine. The adsorption isotherms and kinetics were investigated, showing that the adsorption fits the Freundlich isotherm and the pseudo-second-order kinetic model. The recyclability of MIL-101/GO was shown by the regeneration by acetone. The high adsorption capability and excellent reusability make MIL-101/GO a competent adsorbent for the removal dyes from aqueous solution.

scholarly journals Polyaniline/attapulgite-supported nanoscale zero-valent iron for the rival removal of azo dyes in aqueous solution

2019 ◽  
Vol 37 (3-4) ◽  
pp. 217-235 ◽  
Author(s):  
Hui Xu ◽  
Yajuan Zhang ◽  
Yong Cheng ◽  
Weiguo Tian ◽  
Zeting Zhao ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Azo Dyes ◽  
Chemical Reduction ◽  
Degradation Mechanism ◽  
Test Methods ◽  
Zero Valent Iron ◽  
Alizarin Yellow ◽  
Alizarin Yellow R ◽  
Nanoscale Zero Valent Iron ◽  
Dyes Removal

In this paper, polyaniline/attapulgite (PANI/APT)-supported nanoscale zero-valent iron (nZVI) composites were synthesized by liquid-phase chemical reduction method and used for the removal of two kinds of dyes. The structure of as-prepared nZVI/PANI/APT was characterized by various test methods. The removal property and degradation mechanism for azo (alizarin yellow R, methyl red, chrome black T, methyl orange) and non-azo (methylene blue, rhodamine B) dyes in aqueous solution were investigated. The presence of PANI/APT can decrease the aggregation of nZVI particles with maintenance of reactivity and improving adsorption capacity for degradation azo dye. The experiment results showed that the removal property of the composite materials on azo dyes is obviously better than that on non-azo dyes. The varying removal efficiencies of dyes depend on the different degradation mechanisms. Azo dyes removal by nZVI/PANI/APT was mainly due to the reductive cleavage of the N = N of nZVI, while non-azo dyes removal mainly contributes to the adsorption of PANI/APT. The study demonstrated that nZVI/PANI/APT has potential applications for the removal of azo dyes from wastewaters.

scholarly journals Preparation and Characterization of Graphene Oxide for Pb(II) and Zn(II) Ions Adsorption from Aqueous Solution: Experimental, Thermodynamic and Kinetic Study

Nanomaterials ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 1022 ◽  
Author(s):  
Carlos Guerrero-Fajardo ◽  
Liliana Giraldo ◽  
Juan Moreno-Piraján
Keyword(s):  
Aqueous Solution ◽  
Density Functional Theory ◽  
Graphene Oxide ◽  
Kinetic Study ◽  
Adsorption Isotherms ◽  
Density Functional ◽  
Sorption Process ◽  
Isotherm Models ◽  
Retention Capacity ◽  
Functional Theory

A thermodynamic and kinetic study of the adsorption process of Zn (II) and Pb (II) ions from aqueous solution on the surface of graphene oxide (GO) to establish the mechanisms of adsorbate–adsorbent interaction on this surface. The effect of pH on the retention capacity was studied and adsorption isotherms were determined from aqueous solution of the ions; once the experimental data was obtained, the kinetic and thermodynamic study of the sorption process was carried out. The data were fitted to the Langmuir, Freundlich, Dubinin-Raduskevich and Temkin isotherm models. The results showed that Zn(II) and Pb(II) on the GO adsorbing surface fitted the Langmuir model with correlation coefficients (R2) of 0.996. Kinetic models studied showed that a pseudo-second-order model was followed and thermodynamically, the process was spontaneous according to the values of Gibbs free energy (ΔGo). N2 adsorption isotherms were determined and modeled with the NLDFT (nonlocal density functional theory) and QSDFT (quenched solid density functional theory) kernels.

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