Green synthesis of carbon quantum dots from lemon peel waste: applications in sensing and photocatalysis

RSC Advances ◽  
2016 ◽  
Vol 6 (76) ◽  
pp. 72423-72432 ◽  
Author(s):  
Ankit Tyagi ◽  
Kumud Malika Tripathi ◽  
Narendra Singh ◽  
Shashank Choudhary ◽  
Raju Kumar Gupta
Keyword(s):  
Methylene Blue ◽  
Quantum Dots ◽  
Green Synthesis ◽  
Photocatalytic Degradation ◽  
Carbon Quantum Dots ◽  
Water Soluble ◽  
Blue Dye ◽  
Methylene Blue Dye ◽  
Lemon Peel ◽  
Soluble Carbon

Water soluble carbon quantum dots were synthesized from lemon peel waste and were used for Cr6+ detection and photocatalytic degradation of methylene blue dye.

scholarly journals N, S doped carbon quantum dots inside mesoporous silica for effective adsorption of methylene blue dye

2021 ◽  
Vol 3 (3) ◽  
Author(s):  
Termeh Teymoorian ◽  
Nazanin Hashemi ◽  
Mohammad H. Mousazadeh ◽  
Zahra Entezarian
Keyword(s):  
Methylene Blue ◽  
Quantum Dots ◽  
Mesoporous Silica ◽  
Dye Adsorption ◽  
Carbon Quantum Dots ◽  
Blue Dye ◽  
Maximum Adsorption Capacity ◽  
Spectroscopic Techniques ◽  
Reactive Black 5 ◽  
Methylene Blue Dye

AbstractThis study aimed to develop non-metal elements for doping carbon quantum dots (CQDs) with nitrogen and sulfur (N, S-CQDs), which loaded inside hexagonal mesoporous silica (HMS) in order to effectively remove methylene blue dye (MB) from an aqueous solution. The histidine and cysteine amino acids were used as the source for synthesis N, S-CQDs through the hydrothermal method. Morphology and structure of the N, S-CQDs, and adsorbent (N, S-CQDs/HMS) were characterized by using different microscopic and spectroscopic techniques. The adsorption parameters such as adsorbent dosage (0.25–1 g/L), pH (2–10), contact time (15–75 min), and initial MB dye concentration (20–300 mg/L) were investigated. The maximum adsorption capacity and removal efficiency of MB were determined at 370.4 mg/g and 97%, respectively, under optimum conditions at 303 K. The adsorption isotherm studies were fitted with the Freundlich isotherm equation, and the dye removal kinetics of the adsorbent followed the pseudo-second-order model. Thermodynamic studies showed that the adsorption process had exothermic and spontaneous behavior. The removal of MB next to the Rhodamine B and Reactive Black 5 dyes indicated that the N, S-CQDs/HMS had excellent selective behavior for MB absorption. This prepared adsorbent could be well recycled with suitable activity after four repeated adsorption–desorption cycles. Results revealed that the porous characters, surface area, charge properties, reduction in the bandgap, and quantum yield of the N, S-CQDs/HMS were essential factors that affected dye adsorption.

Photocatalytic degradation of methylene blue dye by porous zinc oxide nanofibers prepared via electrospinning: when defects become merits

2021 ◽  
pp. 149830
Author(s):  
Fabiola Pantò ◽  
Zainab Dahrouch ◽  
Abhirup Saha ◽  
Salvatore Patanè ◽  
Saveria Santangelo ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Zinc Oxide ◽  
Photocatalytic Degradation ◽  
Blue Dye ◽  
Methylene Blue Dye

A facile approach to the synthesis of bilayer hematite films for efficient photocatalytic degradation of methylene blue dye in aqueous solution

2022 ◽  
pp. 1-14
Author(s):  
Zoubaida Landolsi ◽  
Ibtissem Ben Asseker ◽  
Abdullah Yahya Abdullah Al Zahrani ◽  
Daniela Nunes ◽  
Elvira Fortunato ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Photocatalytic Degradation ◽  
Blue Dye ◽  
Methylene Blue Dye
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