Nano-engineered Adsorbent for the Removal of Dyes from Water: A Review

Background: The huge quantity of wastewater, containing poisonous and hazardous dyes, is released by various industries which pollute water in direct and indirect ways. Most of the dyes are a dangerous class of water contaminants which have affected the environment drastically. Some dyes such as congo red, rhodamine B, methylene blue, methyl violet, and crystal violet are a serious threat to human beings. Remediation Method: Numerous methods are available for the removal of dyes from water. Adsorption, being a superior and eco-friendly technique, has advantage of eliminating organic dyes because of the availability of materials as adsorbents. The inexpensive nanomaterials are a more attractive choice for remediation of various dyes due to their unique properties and offer an adequate pathway to adsorb any organic dye from water to overcome its hazardous effects on human health. Results: In this review, we have discussed the latest literature related to various types of synthesis, characterization and uses as adsorbent for highly adsorptive removal capacity of nanoparticles for organic dyes. Conclusion: Adsorption technology provides an attractive pathway for further research and improvement in more efficient nanoparticles, with higher adsorption capacity, for numerous dyes to eliminate the dyes discharged from various industries and thus reduce the contamination of water. Therefore, nanocomposites may contribute to future prospective water treatment process.

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Efficient Sunlight Active Nanocomposite Photocatalyst for Degradation of Pollutant Organic Dyes

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.726-731.650 ◽

2013 ◽

Vol 726-731 ◽

pp. 650-653

Author(s):

Li Mei Duan ◽

Jing Hai Liu ◽

Qing Yu Pang ◽

Ling Xu ◽

Zong Rui Liu

Keyword(s):

Methylene Blue ◽

Photocatalytic Activity ◽

Treatment Process ◽

Organic Dyes ◽

Environmental Pollutants ◽

Organic Dye ◽

Water Treatment Process ◽

One Step ◽

Pollutants Removal ◽

The One

The sunlight activated photocatalysts are urgently needed for the applications of photocatalytic techniques to environmental pollutants removal. Herein, we report the one-step hydrothermally prepared CdS/TiO2 nanocomposite photocatalyst that is active in the degradation of pollutant organic dyes under solar light. The morphology and components are confirmed by TEM, SEM and XRD. With methylene blue (MB) as the model pollutant organic dye, the photocatalytic activity of CdS/TiO2 nanocomposite photocatalyst under sunlight is demonstrated, and 80% MB is removed after 120 minutes sunlight illumination. Besides, the influences of pH, the amount of photocatalyst and the addition of H2O2 on photocatalytic activity for the degradation of MB are also investigated to mimic water treatment process.

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Capacitive deionization (CDI) for desalisation using carbon aerogel electrodes

Science and Technology Development Journal ◽

10.32508/stdj.v19i3.570 ◽

2016 ◽

Vol 19 (3) ◽

pp. 155-164

Author(s):

Duyen Khac Le ◽

Nghiep Quoc Pham ◽

Kien Anh Le

Keyword(s):

Treatment Process ◽

Carbon Aerogel ◽

High Specific Surface Area ◽

Nitrogen Atmosphere ◽

Capacitive Deionization ◽

Nacl Solution ◽

Removal Capacity ◽

Water Treatment Process ◽

Effective Technology ◽

Organic Aerogel

Capacitive deionization (CDI) is an electrochemical water treatment process that holds the promise of not only being a commercially viable alternative for treating water but for saving energy as well. Carbon aerogel electrodes for CDI process with high specific surface area (779.04 m2/g) and nano-pore (2-90 nm) have been prepared via pyrolyzing RF organic aerogel at 800oC in nitrogen atmosphere. The CDI characteristics of carbon aerogel electrodes were investigated for the NaCl absorption into a CDI cell at variation conditions. Experiments data showed that the maximum NaCl removal capacity was 21.41 mg/g in 500 mg/L NaCl solution, higher than for other carbon-based materials in the literature. It was evaluated that the CDI process using carbon aerogel electrodes promising to be an effective technology for desalination.

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