Dyes, Azo

Chudgar, Rasik J.; Oakes, John; Staff, Updated by

doi:10.1002/0471238961.01261503082104.a01.pub3

Cited by 6 publications

(2 citation statements)

References 58 publications

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“…Similarly dyes are also used to assess the efficacy of sewage and wastewater treatment plants as well as agriculture research. Textile industries consume more than 70% of total dyes produced worldwide [10]. Dyes in textile, food or in any other industries are used in minute quantities; for instance, it has been reported that one ton of textile dye is more than enough to color 42,000 clothes/suits [11].…”

Section: Application Of Dyesmentioning

confidence: 99%

Contamination of Water Resources by Food Dyes and Its Removal Technologies

Hussain¹,

Khan²,

Gul³

et al. 2020

Water Chemistry

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Food dyes comprise different groups which impart color to a wide range of food products. Food products are mainly purchased and consumed by people because they are nutritive and flavorsome and have an attractive color. Food color stimulates appetite and enhances its esthetic appeal of food on table for customer. With sky rocketing industrialization and modernization, the worldwide production of dyes in 2010 was forecasted to be 2.1 metric tons. It has been estimated that 15% of total dyes produced worldwide are discharged to water bodies which adversely affect aquatic ecosystem. Dyes in water reduces its transparency, thereby declining light penetration in the water, hence influencing photosynthesis which consequently reduces dissolved oxygen which is an alarming situation for both aquatic flora and fauna. Dyes wastewater discharged from huge number of industries like textile, leathers, paint, food, pharmaceutical etc. and deteriorating the aquatic environment and pose threat to living organism. The presence of dye molecules in water channels is an emerging alarm to an environmental scientist. An environmental friendly and self-sustainable treatment method should be explored to address this problem. Therefore, this work elaborates the various methods used for removal and degradation of dyes in water, although some processes have a common shortcoming like production of secondary pollution to the environment. This chapter have tried to highlight the important application of food dyes, their contamination and their toxic effect. Herein we also focus on remediation techniques like separation (adsorption, filtration, etc.) and degradation (chemical, biological and electrochemical oxidation) of dyes in aqueous solution. The mechanism and pros and cons of different methods are explored and discussed briefly.

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Section: Application Of Dyesmentioning

confidence: 99%

Contamination of Water Resources by Food Dyes and Its Removal Technologies

Hussain¹,

Khan²,

Gul³

et al. 2020

Water Chemistry

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“…More than 100,000 dyes used in several industries such as textile, leathers, paint, paper, plastics, food, cosmetics, pharmaceutica, etc (Sen et al, 2011;Djelloul and Hamdaoui, 2014). Textile industries use more than 70% of the total produced dyes all over the world (Chudgar et al, 2014). Annually, these industries used a huge amount of water and about 5,000-10,000 tons of dyes which are released as effluent into the waterways (Pirkarami and Olya, 2017;Yagub et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Removal of Methylene Blue Dye from Aqueous Solutions by Bentonite and Cement Kiln Dust: Comparative Study of Adsorption Equilibrium, Kinetic, and Thermodynamic

Refaey

2021

Alexandria Science Exchange Journal

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This study compared the methylene blue (MB) removal from aqueous solution by natural bentonite (Bent) and cement kiln dust (CKD). Bentonite and CKD were characterized by X-ray diffraction (XRD), X-ray fluorescence (XRF), Brunauer Emmett Teller (BET) specific surface area, Fourier transform infrared (FTIR), and scanning electron microscopy (SEM). The comparison between bentonite and CKD in the removal of MB dye was investigated in different conditions including initial MB concentration, adsorbent doses, pH, salt concentration, and temperature by batch experiments. Adsorption kinetics results were fitted with fractional power, Elovich, pseudo-first-order, pseudo-second-order, and intraparticle diffusion equations. The pseudo-second-order model was well fitted for experimental results at the different tested initial concentrations (50-300 mgMB/L). Equilibrium adsorption data were evaluated by Freundlich and Langmuir and Temkin models. The experimental results fitted very well by the Langmuir isotherm model. Bentonite exhibited the largest adsorption capacity (3257.33 mg/g) than CKD (2150.54 mg/g). Increasing the temperature from 298K to 323 o K convinced an increase of the adsorption of MB dye by both sorbents and the process was found to be endothermic and spontaneous. The obtained results indicated that both adsorbents are efficient and low-cost adsorbents for effective removal of MB dye with privilege in the efficiency for bentonite and with no cost for CKD.

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