scholarly journals Improved Mass-Transfer Enhances Photo-Driven Dye Degradation and H2 Evolution over a Few-Layer WS2/ZnO Heterostructure

ACS Omega ◽  
2022 ◽  
Author(s):  
Yu-Ju Huang ◽  
Lian-Ming Lyu ◽  
Cheng-Yi Lin ◽  
Guan-Chi Lee ◽  
Kai-Yuan Hsiao ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Dye Degradation ◽  
H2 Evolution

Electrogeneration of Active Chlorine in a Filter-Press-Type Reactor Using a New Sb2O5 Doped Ti/RuO2-ZrO2 Electrode: Indirect Indigoid Dye Oxidation

2017 ◽  
Vol 15 (2) ◽  
Author(s):  
Francisca A. Rodríguez ◽  
Eligio P. Rivero ◽  
Ignacio González
Keyword(s):  
Mass Transfer ◽  
Dye Degradation ◽  
Indigo Carmine ◽  
Chloride Concentration ◽  
Electrochemical Reactor ◽  
Filter Press ◽  
Active Chlorine ◽  
Visible Absorption ◽  
First Order Kinetics

Abstract This paper presents the study on active chlorine mediated electrochemical oxidation of model solutions that simulate textile effluents containing an indigoid dye (indigo carmine) and sodium chloride (0.05 M) using a new Sb2O5-doped Ti/RuO2-ZrO2 electrode. The study was carried out in a filter-press electrochemical reactor specially designed to minimize flow deviations and provide homogeneous mass transfer flux over the electrode surface. Firstly, the mass-transfer-limited chloride oxidation reaction was studied in the absence of dye in order to understand the active chlorine formation process. Changes in pH, chloride concentration and UV-visible absorption spectra during electrolysis reveal the formation of active chlorine (mainly hypochlorite) with current efficiencies for chloride oxidation of 0.558 and 0.503 at 10 and 20 mA cm−2, respectively. Secondly, chloride oxidation was investigated in the presence of indigo carmine dye (0.5 mM) where in-situ generated active chlorine was responsible for -C=C- bond breaking and dye degradation. The solution discoloration followed a pseudo-first order kinetics where kinetic coefficient was inversely proportional to dye concentration. The oxidation with active chlorine had an average efficiency of 0.7 and a very competitive energy consumption between 49.2 and 128.5 kW h (kg COD removed)−1 depending on current density and flow rate.

TiO2/g-C3N4 heterojunction hollow porous nanofibers as superior visible-light photocatalysts for H2 evolution and dye degradation

2021 ◽  
Author(s):  
Jing Liu ◽  
Dianming Li ◽  
Xiaofeng Liu ◽  
Jie Zhou ◽  
Hong Zhao ◽  
...  
Keyword(s):  
Visible Light ◽  
Photocatalytic Performance ◽  
Dye Degradation ◽  
H2 Evolution

Hollow porous TiO2/g-C3N4 exhibited high photocatalytic performance ascribed to multiple light reflections and fast photoelectron transport in heterojunctions.

scholarly journals Exploiting the Potential of Supported Magnetic Nanomaterials as Fenton-like Catalysts for Environmental Applications

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 2902
Author(s):  
Jorge González-Rodríguez ◽  
María Gamallo ◽  
Julio J. Conde ◽  
Zulema Vargas-Osorio ◽  
Carlos Vázquez-Vázquez ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Dye Degradation ◽  
Silica Matrix ◽  
Emerging Pollutants ◽  
Magnetic Nanomaterials ◽  
Iron Hydroxides ◽  
Nanoparticle Coating ◽  
Degradation Of Dyes ◽  
Treated Effluent ◽  
Operational Variables

In recent years, the application of magnetic nanoparticles as alternative catalysts to conventional Fenton processes has been investigated for the removal of emerging pollutants in wastewater. While this type of catalyst reduces the release of iron hydroxides with the treated effluent, it also presents certain disadvantages, such as slower reaction kinetics associated with the availability of iron and mass transfer limitations. To overcome these drawbacks, the functionalization of the nanocatalyst surface through the addition of coatings such as polyacrylic acid (PAA) and their immobilization on a mesoporous silica matrix (SBA15) can be factors that improve the dispersion and stability of the nanoparticles. Under these premises, the performance of the nanoparticle coating and nanoparticle-mesoporous matrix binomials in the degradation of dyes as examples of recalcitrant compounds were evaluated. Based on the outcomes of dye degradation by the different functionalized nanocatalysts and nanocomposites, the nanoparticles embedded in a mesoporous matrix were applied for the removal of estrogens (E1, E2, EE2), accomplishing high removal percentages (above 90%) after the optimization of the operational variables. With the feasibility of their recovery in mind, the nanostructured materials represented a significant advantage as their magnetic character allows their separation for reuse in different successive sequential batch cycles.

scholarly journals Correction: TiO2/g-C3N4 heterojunction hollow porous nanofibers as superior visible-light photocatalysts for H2 evolution and dye degradation

2022 ◽  
Author(s):  
Jing Liu ◽  
Dianming Li ◽  
Xiaofeng Liu ◽  
Jie Zhou ◽  
Hong Zhao ◽  
...  
Keyword(s):  
Visible Light ◽  
Dye Degradation ◽  
H2 Evolution

Correction for ‘TiO2/g-C3N4 heterojunction hollow porous nanofibers as superior visible-light photocatalysts for H2 evolution and dye degradation’ by Jing Liu et al., New J. Chem., 2021, 45, 22123–22132, DOI: 10.1039/d1nj04390k.

Enhancement of visible light driven dye degradation and photocatalytic H2 evolution over MoS2 through combination with perylene diimide aggregates

2021 ◽  
Author(s):  
Yongshan Ma ◽  
Jingcheng Cui ◽  
Mengmeng Yin ◽  
Xuemei Li ◽  
Tianyi Jiang ◽  
...  
Keyword(s):  
Visible Light ◽  
Hydrogen Evolution ◽  
Dye Degradation ◽  
Organic Contaminant ◽  
Perylene Diimide ◽  
H2 Evolution ◽  
Photocatalytic Hydrogen Evolution ◽  
Visible Light Driven ◽  
Photocatalytic H2 Evolution

Exploiting an efficient and cheap catalyst for elimination of organic contaminant from wastewater and photocatalytic hydrogen evolution has drawn great attentions recently. Herein, MoS2 nanoflowers (MoS2 NFs) and 1- phenol...

Molecular engineering of carbon nitride towards photocatalytic H2 evolution and dye degradation

2021 ◽  
Author(s):  
Asif Hayat ◽  
Naghma Shaishta ◽  
Ikram Uddin ◽  
Muhammad Khan ◽  
Sunil Kumar Baburao Mane ◽  
...  
Keyword(s):  
Carbon Nitride ◽  
Dye Degradation ◽  
Molecular Engineering ◽  
H2 Evolution ◽  
Photocatalytic H2 Evolution
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