scholarly journals Adsorption of congo red dye from aqueous solutions by prepared activated carbon with oxygen-containing functional groups and its regeneration

2018 ◽  
Vol 37 (1-2) ◽  
pp. 160-181 ◽  
Author(s):  
Ridha Lafi ◽  
Imed Montasser ◽  
Amor Hafiane
Keyword(s):  
Activated Carbon ◽  
Functional Groups ◽  
Congo Red ◽  
Contact Time ◽  
Electrostatic Interactions ◽  
Dye Adsorption ◽  
Congo Red Dye ◽  
Equilibrium Data ◽  
Red Dye ◽  
Adsorption Desorption

This study investigates the potential use of activated carbon prepared from coffee waste (CW) as an adsorbent for the removal of congo red dye from aqueous solution. The oxygen-containing groups of activated carbon prepared from CW play an important role in dyes ions adsorption onto activated carbon prepared from CW. The activated carbon is characterized by scanning electron microscopy and Fourier transform infrared (FTIR) spectroscopy. Adsorption experiments were carried out as batch studies at different contact time, pH, and initial dye concentration. The dye adsorption equilibrium was attained after 120 min of contact time. Removal of dye in acidic solutions was better than in basic solutions. The adsorption of dye increased with increasing initial dye concentration. The equilibrium data were revealed that Langmuir model was more suitable to describe the congo red adsorption and demonstrated excellent reusability potential with desorption greater than 90% throughout six consecutive adsorption–desorption cycles. Experimental data founded that kinetics followed a pseudo-second-order equation. Thermodynamic study showed that the adsorption was a spontaneous and exothermic process. According to the FTIR analyses, hydrogen bonding and electrostatic interactions between dyes and oxygen-containing functional groups on activated carbon prepared from CW are dominant mechanisms for dye adsorption.

scholarly journals Adsorptive Removal of Congo red dye from wastewater using Fenugreek Powder

2020 ◽  
Author(s):  
Neha bhadauria ◽  
Arjun Suresh
Keyword(s):  
Aqueous Solution ◽  
Congo Red ◽  
Contact Time ◽  
Adsorption Process ◽  
Dye Adsorption ◽  
Textile Dye ◽  
Adsorptive Removal ◽  
Congo Red Dye ◽  
Red Dye ◽  
Maximum Removal

The present study analyzed the efficiency of a naturally derived fenugreek powder for removal of Congo red dye from the aqueous solution. The flocculation Studies on Congo Red (CR) a hazardous, textile dye onto Fenugreek Powder and its adsorption was analyzed. Fenugreek Powder is Eco-friendly, biodegradable and locally available in the market. The dye adsorption process was performed in different batches at varying pH, dye concentration, adsorbent concentration and contact time to get the best results. The result showed that the maximum removal of dye was 42.4% with 10mg/l of Fenugreek powder at pH 4.

Removal of Congo red dye from aqueous solutions using a halloysite-magnetite-based composite

2016 ◽  
Vol 73 (9) ◽  
pp. 2132-2142 ◽  
Author(s):  
F. Ferrarini ◽  
L. R. Bonetto ◽  
Janaina S. Crespo ◽  
M. Giovanela
Keyword(s):  
Aqueous Solutions ◽  
Adsorption Kinetics ◽  
Congo Red ◽  
Contact Time ◽  
High Efficiency ◽  
Dye Adsorption ◽  
Order Model ◽  
Congo Red Dye ◽  
Pseudo Second Order ◽  
Red Dye

Adsorption has been considered as one of the most effective methods to remove dyes from aqueous solutions due to its ease of operation, high efficiency and wide adaptability. In view of all these aspects, this study aimed to evaluate the adsorption capacity of a halloysite-magnetite-based composite in the removal of Congo red dye from aqueous solutions. The effects of stirring rate, pH, initial dye concentration and contact time were investigated. The results revealed that the adsorption kinetics followed the pseudo-second-order model, and equilibrium was well represented by the Brunauer–Emmett–Teller isotherm. The thermodynamic data showed that dye adsorption onto the composite was spontaneous and endothermic and occurred by physisorption. Finally, the composite could also be regenerated at least four times by calcination and was shown to be a promising adsorbent for the removal of this dye.

Microwave-synthesized and Fenton-functionalized Pinus sylvestris bark activated carbon/metal oxides for the effective uptake of tetracycline and congo red dye

2019 ◽  
Vol 10 (4) ◽  
pp. 959-975 ◽  
Author(s):  
Martins O. Omorogie ◽  
Jonathan O. Babalola ◽  
Abimbola M. Olatunde ◽  
Taofeek Alimi ◽  
Kingsley I. John ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Pinus Sylvestris ◽  
Metal Oxides ◽  
Congo Red ◽  
Congo Red Dye ◽  
Red Dye

scholarly journals Chemical and physical preparation of activated carbon using Raw bagasse for cationic dye adsorption

2016 ◽  
Vol 18 (2) ◽  
pp. 402-415 ◽  
Keyword(s):  
Activated Carbon ◽  
Sugarcane Bagasse ◽  
Contact Time ◽  
Dye Adsorption ◽  
Isotherm Models ◽  
Adsorptive Capacity ◽  
Adsorption Isotherm Models ◽  
Equilibrium Data ◽  
Agriculture Wastes ◽  
Physical Preparation

<div> <p>Agriculture wastes like sugarcane bagasse are available in large quantities in Egypt. Various adsorbents from natural materials, industrial waste materials, agricultural by-products, and biomass based activated carbon can be used in the removal of various dyes. Raw Bagasse pith (RBP) was used to prepare activated carbon (AC) using phosphoric acid (H<sub>3</sub>PO<sub>4</sub>) as a chemical activating agent. C The raw BP and the synthesized adsorbent were characterized by Fourier transform infrared (FTIR) spectroscopy and scanning electron microscope (SEM). The effectiveness of AC prepared in adsorption of methylene blue (MB) has been studied as a function of adsorbent type, initial dye concentration and contact time. The effects of the initial dye concentration and contact time were evaluated. Adsorption isotherm models - Langmuir, Freundlich and Temkin were used to simulate the equilibrium data. Langmuir equation was found to have the highest value of R<sup>2</sup> compared with other models. Furthermore, it was found that sugarcane bagasse have a high adsorptive capacity towards MB.</p> </div> <p>&nbsp;</p>

Experimentally and theoretically approaches for Congo red dye adsorption on novel kaolinite-alga nano-composite

2021 ◽  
pp. 1-23
Author(s):  
Doaa Rady ◽  
Mohamed Shaban ◽  
Khaled N. M. Elsayed ◽  
Ahmed Hamd ◽  
N. K. Soliman ◽  
...  
Keyword(s):  
Congo Red ◽  
Dye Adsorption ◽  
Nano Composite ◽  
Congo Red Dye ◽  
Red Dye
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