TiO2/CTS/ATP adsorbent modification and its application in adsorption-ultrafiltration process for dye wastewater purification

2021 ◽  
Author(s):  
Zhihong Wang ◽  
Zekun Wu ◽  
Xujun Zhi ◽  
Tianfu Tu ◽  
Jinxu Nie ◽  
...  
Keyword(s):  
Dye Wastewater ◽  
Wastewater Purification ◽  
Ultrafiltration Process

scholarly journals Enhanced photocatalytic properties of reusable TiO 2 -loaded natural porous minerals in dye wastewater purification

2016 ◽  
Vol 302 ◽  
pp. 426-433 ◽  
Author(s):  
Bin Wang ◽  
Fernanda Condi de Godoi ◽  
Shuilin Zheng ◽  
Ian R. Gentle ◽  
Congju Li
Keyword(s):  
Photocatalytic Properties ◽  
Dye Wastewater ◽  
Wastewater Purification

scholarly journals TiO2/CTS/ATP Adsorbent and its Application in Adsorption-Ultrafiltration Process for Dye Wastewater Purification

2021 ◽  
Author(s):  
Zhihong Wang ◽  
Zekun Wu ◽  
Xujun Zhi ◽  
Tianfu Tu ◽  
Jinxu Nie ◽  
...  
Keyword(s):  
Membrane Fouling ◽  
Congo Red ◽  
Transmembrane Pressure ◽  
Dye Wastewater ◽  
Dyeing Wastewater ◽  
Wastewater Purification ◽  
Water Contact ◽  
Filtration System ◽  
Modified Attapulgite ◽  
Receiving Waters

Abstract Industrial dyeing produces highly polluting wastewater and threatens the environment. Effective treatment of dyeing wastewater is a crucial step to prevent toxic chemicals from entering receiving waters. This study aimed to assess a modified attapulgite (ATP)-based adsorbent for dyeing wastewater purification by introducing chitosan (CTS) and titanium dioxide (TiO2) into the adsorbent material named TiO2/CTS/ATP. It was found that, after modification, the adsorbent showed a lower hydrophilicity, as demonstrated by an increase in the water contact angle from 9.1° to 42°, which could reduce the water adsorption tendency and potentially facilitate contaminants adherence. The modification also led to a significantly increased specific surface area of 79.111 m2/g from 3.791 m2/g, and exhibited more uniform and smaller particle size (reduced to 2.52 µm from 3.99 µm). When the TiO2/CTS/ATP adsorbent was applied to the adsorption of Congo red solution, the adsorption efficiency was observed to reach to 97.6% at the dosage of 0.5 g/L. Furthermore, the combination of adsorption and ultrafiltration was able to achieve 99% Congo red removal. Adsorption pretreatment prior to the ultrafiltration also enabled to reduce membrane fouling, increased the reversible membrane fouling and resulted in a considerably lower transmembrane pressure as compared with the direct ultrafiltration filtration system.

A robust and renewable solar steam generator for high concentration dye wastewater purification

2022 ◽  
Author(s):  
Xuan Wang ◽  
Kang Liu ◽  
Zubin Wang ◽  
Liping Heng ◽  
Lei Jiang
Keyword(s):  
Steam Generator ◽  
Water Purification ◽  
Catalytic Degradation ◽  
Dye Wastewater ◽  
High Concentration ◽  
Steam Generators ◽  
Wastewater Purification ◽  
Sustainable Technology

As an eco-friendly and sustainable technology, the solar-driven interfacial evaporation for water purification garners widespread attention. In the field of dye wastewater purification, some solar steam generators with catalytic degradation...

scholarly journals Metal-Free Carbon Quantum Dots Implant Graphitic Carbon Nitride: Enhanced Photocatalytic Dye Wastewater Purification with Simultaneous Hydrogen Production

2020 ◽  
Vol 21 (3) ◽  
pp. 1052 ◽  
Author(s):  
Lilei Zhang ◽  
Jingxiao Zhang ◽  
Yuanyu Xia ◽  
Menghan Xun ◽  
Hong Chen ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Hydrogen Production ◽  
Carbon Nitride ◽  
Carbon Quantum Dots ◽  
Free Carbon ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Dye Wastewater ◽  
Wastewater Purification ◽  
Metal Free

The use of photocatalysts to purify wastewater and simultaneously convert solar energy into clean hydrogen energy is of considerable significance in environmental science. However, it is still a challenge due to their relatively high costs, low efficiencies, and poor stabilities. In this study, a metal-free carbon quantum dots (CQDs) modified graphitic carbon nitride photocatalyst (CCN) was synthesized by a facile method. The characterization and theoretical calculation results reveal that the incorporation of CQDs into the g-C3N4 matrix significantly improves the charge transfer and separation efficiency, exhibits a redshift of absorption edge, narrows the bandgap, and prevents the recombination of photoexcited carriers. The hydrogen production and simultaneous degradation of methylene blue (MB) or rhodamine B (RhB) in simulated wastewaters were further tested. In the simulated wastewater, the CCN catalyst showed enhanced photodegradation efficiency, accompanied with the increased hydrogen evolution rate (1291 µmol·h−1·g−1). The internal electrical field between the g-C3N4 and the CQDs is the main reason for the spatial separation of photoexcited electron-hole pairs. Overall, this work could offer a new protocol for the design of highly efficient photocatalysts for dye wastewater purification with simultaneous hydrogen production.

Defect‐Induced Self‐Cleaning Solar Absorber with Full‐Spectrum Light Absorption for Efficient Dye Wastewater Purification

Solar RRL ◽  
2021 ◽  
pp. 2100105
Author(s):  
Baohua Yuan ◽  
Chaofan Zhang ◽  
Ying Liang ◽  
Lixia Yang ◽  
Huawei Yang ◽  
...  
Keyword(s):  
Light Absorption ◽  
Dye Wastewater ◽  
Wastewater Purification ◽  
Full Spectrum ◽  
Solar Absorber ◽  
Self Cleaning

Microporous Membranes from an Insoluble Polyimide

1995 ◽  
Vol 60 (10) ◽  
pp. 1741-1746
Author(s):  
Jan Schauer ◽  
Miroslav Marek
Keyword(s):  
Acetic Anhydride ◽  
Phase Inversion ◽  
Amic Acid ◽  
Microporous Membranes ◽  
Inversion Process ◽  
Phase Inversion Process ◽  
Ultrafiltration Process

Poly(amic acid) prepared from 3,3',4,4'-benzophenonetetracarboxylic dianhydride and bis(4-aminophenyl) ether was used for preparation of microporous membranes by the phase inversion process. Membranes coagulated in acetic anhydride were brittle but usable for ultrafiltration. Coagulation of the poly(amic acid) in water or lower alcohols and subsequent thermal cyclocondensation led to extremely brittle polyimides, which limits their use for ultrafiltration process.

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