Tungsten Disulfide-reduced GO/CNT Aerogel: A Tuned Interlayer Spacing Anode for Efficient Water Desalination

2021 ◽  
Author(s):  
Sareh Vafakhah ◽  
Mohsen Saeedikhani ◽  
Shaozhuan Huang ◽  
Zhi Yi Leong ◽  
Ye Wang ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Interlayer Spacing ◽  
Water Shortage ◽  
Tungsten Disulfide ◽  
Water Desalination ◽  
Capacitive Deionization ◽  
Environmental Compatibility ◽  
Global Water

Owing to the favorable energy efficiency and environmental compatibility, capacitive deionization (CDI) has been greatly developed as a potential technology to overcome the ever-growing global water shortage. Herein, an effective...

scholarly journals Investigations on the fouling characteristic of humic acid and alginate sodium in capacitive deionization

2021 ◽  
Author(s):  
Huizhong Zhang ◽  
Jiayu Tian ◽  
Xiujuan Hao ◽  
Dongmei Liu ◽  
Fuyi Cui
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Humic Acid ◽  
Natural Organic Matter ◽  
Water Desalination ◽  
Capacitive Deionization ◽  
Organic Substances ◽  
Water Softening ◽  
Electrical Field ◽  
Adsorption Amount

Abstract Capacitive deionization (CDI) has been investigated for brackish water desalination, selective removal of ions, and water softening. We used humic acid (HA) and alginate sodium (SA) to simulate different kinds of natural organic matter to investigate the fouling phenomena during CDI operation. Adsorption amount and energy efficiency were studied. Results showed that both SA and HA could decrease the removal of NaCl during CDI operation. There existed a slight decrease of energy consumption in SA solutions which was opposite to that in HA solutions. HA can compete with ions adsorbed by electrodes and attach to electrodes adhesively, resulting in co-ion repulsion. SA is not sensitive to electrical field and its fouling is not obvious. The amount of adsorbed Mg2+ would increase from 0.927 mg/g to 1.508 mg/g in ten cycles' operation and the increment of Ca2+ was from 1.885 mg/g to 2.878 mg/g in SA solutions. This increase of adsorption was due to the complexation between SA and cations. Simultaneously, energy consumption was decreased. In HA solutions, energy consumption of Mg2+ and Ca2+ adsorption increased. In ten cycles' operations, both HA and SA could reduce the efficiency of CDI operation. The types of organic substances are important factors in fouling of CDI electrodes.

A brief review on operation of flow-electrode capacitive deionization cells for water desalination

2021 ◽  
Vol 223 ◽  
pp. 34-53
Author(s):  
Khadijeh Dehghan ◽  
Seyed Ahmad Mirbagheri ◽  
Mahdi Alam
Keyword(s):  
Water Desalination ◽  
Capacitive Deionization

scholarly journals Task-Specific Ionic Liquid Enables Highly Efficient Low Temperature Desalination by Directional Solvent Extraction

2020 ◽  
Author(s):  
Jiaji Guo ◽  
Zachary D. Tucker ◽  
Yu Wang ◽  
Brandon L. Ashfeld ◽  
Tengfei Luo
Keyword(s):  
Ionic Liquid ◽  
Solvent Extraction ◽  
Critical Role ◽  
Water Shortage ◽  
Computational Simulations ◽  
Water Energy Nexus ◽  
Directed Synthesis ◽  
Desalination Technology ◽  
Task Specific Ionic Liquid ◽  
Global Water

Seawater desalination plays a critical role in addressing the global water shortage challenge, and directional solvent extraction (DSE) is an emerging desalination technology to address this challenge. Herein, we demonstrate that through a combination of target-directed synthesis and computational simulations, task-specific ionic liquids (ILs) may significantly advance current DSE technology by improving the energy efficiency toward impacting the global water-energy nexus.

scholarly journals Integrated Capacitive Deionization and Humidification-Dehumidification System for Brackish Water Desalination

Energies ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 7641
Author(s):  
Sadam-Hussain Soomro ◽  
Yusufu Abeid Chande Jande ◽  
Salman Memon ◽  
Woo-Seung Kim ◽  
Young-Deuk Kim
Keyword(s):  
Renewable Energy ◽  
Salt Concentration ◽  
Brackish Water ◽  
Waste Heat ◽  
Renewable Energy Sources ◽  
Water Desalination ◽  
Energy Sources ◽  
Capacitive Deionization ◽  
Combined System ◽  
Flow Rates

A hybrid capacitive deionization and humidification-dehumidification (CDI–HDH) desalination system is theoretically investigated for the desalination of brackish water. The CDI system works with two basic operations: adsorption and regeneration. During adsorption, water is desalted, and during the regeneration process the ions from electrodes are detached and flow out as wastewater, which is higher in salt concentration. This wastewater still contains water but cannot be treated again via the CDI unit because CDI cannot treat higher-salinity waters. The discarding of wastewater from CDI is not a good option, since every drop of water is precious. Therefore, CDI wastewater is treated using waste heat in a process that is less sensitive to high salt concentrations, such as humidification-dehumidification (HDH) desalination. Therefore, in this study, CDI wastewater was treated using the HDH system. Using the combined system (CDI–HDH), this study theoretically investigated brackish water of various salt concentrations and flow rates at the CDI inlet. A maximum distillate of 1079 L/day was achieved from the combined system and the highest recovery rate achieved was 24.90% from the HDH unit. Additionally, two renewable energy sources with novel ideas are recommended to power the CDI–HDH system.

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