Effect of dye structure on color removal efficiency by coagulation

Mcyotto, Felix O.; Wei, Qunshan; Macharia, Daniel K.; Huang, Manhong; Shen, Chensi; Chow, Christopher W.K.

doi:10.1016/j.cej.2020.126674

Cited by 233 publications

(61 citation statements)

References 67 publications

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“…Coagulation-flocculation is among the most widespread physiochemical processes for the removal and distraction of coloring substances in wastewater. The removal of color by coagulation is strongly dependent on the structure of dye molecules (chromophores and auxochromes), so structural considerations of dyes are very important when choosing the most appropriate coagulant for dye removal (Mcyotto et al, 2021). The method can be separated into coagulation (destabilization of the colloidal suspensions by charge neutralization), flocculation, and sedimentation (physical processes that allow the smaller particles to be grouped so that they can be easily separated by sedimentation).…”

Section: Coagulation-flocculationmentioning

confidence: 99%

Biomass-Based Adsorbents for Removal of Dyes From Wastewater: A Review

Aragaw

Bogale

2021

Front. Environ. Sci.

150

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Dyes, especially azo dyes contained in wastewaters released from textile, pigment, and leather industries, are entering into natural waterbodies. This results in environmental deterioration and serious health damages (for example carcinogenicity and mutagenesis) through food chains. Physiochemical, membrane processes, electrochemical technology, advanced oxidation processes, reverse osmosis, ion exchange, electrodialysis, electrolysis, and adsorption techniques are commonly used conventional treatment technologies. However, the limitations of most of these methods include the generation of toxic sludge, high operational and maintenance costs. Thus, technological advancements are in use to remediate dyes from effluents. Adsorption using the nonconventional biomass-based sorbents is the greatest attractive alternatives because of their low cost, sustainability, availability, and eco-friendly. We present and reviewed up-to-date publications on biomass-based sorbents used for dye removal. Conceptualization and synthesizing their state-of-the-art knowledge on their characteristics, experimental conditions used were also discussed. The merits and limitations of various biosorbents were also reflected. The maximum dye adsorption capacities of various biosorbents were reviewed and synthesized in the order of the biomass type (algae, agricultural, fungal, bacterial, activated carbon, yeast, and others). Surface chemistry, pH, initial dye concentration, temperature, contact time, and adsorbent dose as well as the ways of the preparations of materials affect the biosorption process. Based on the average dye adsorption capacity, those sorbents were arranged and prioritized. The best fit of the adsorption isotherms (for example Freundlich and Langmuir models) and basic operating parameters on the removal dyes were retrieved. Which biomass-based adsorbents have greater potential for dye removal based on their uptake nature, cost-effectiveness, bulk availability, and mono to multilayer adsorption behavior was discussed. The basic limitations including the desorption cycles of biomass-based adsorbent preparation and operation for the implementation of this technology were forwarded.

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Section: Coagulation-flocculationmentioning

confidence: 99%

Biomass-Based Adsorbents for Removal of Dyes From Wastewater: A Review

Aragaw

Bogale

2021

Front. Environ. Sci.

150

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“…Thus, it is essential to treat dye‐containing effluents before discharging them into the environment. Dye‐containing wastewater is mainly treated by electrochemical, [175] membrane filtration, [176] coagulation, [177] and adsorption [178] methods. Metal‐organic frameworks with unique adsorptive properties can be utilized for removing dyes from the aquatic media through the adsorptive removal method as an easily operable, effective, and reusable separation technique [179] .…”

Section: Dye Removalmentioning

confidence: 99%

Recent Progress in Adsorptive Removal of Water Pollutants by Metal‐Organic Frameworks

2021

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Difficulty in accessing drinkable water resources, mostly originating from water pollution, has become a serious challenge for humans and the environment. Increasing population, growth of industrial activities, and the increasing demand for the agricultural sector have generated various pollutants into the environment, especially water resources. Thus, treatment of industrial effluents before discharging them into the environment is necessary to reduce the pollutants, maintain the quality of drinkable water, recycle wastewater sources to save water consumption, and minimize water resource supplied. Among the new materials applied for the adsorptive removal of pollutants from aquatic environments, metal‐organic frameworks have become a promising candidate to optimize wastewater treatment process. This is mainly due to their unique properties such as structural diversity, high specific surface area, and high adsorption capacity. This article aims to review the highlights and challenges of MOFs when are being used to remove heavy metals, dyes, pharmaceuticals, personal care products, pesticides, and herbicides from polluted water resources. The relationship between the properties of MOFs and their performance for adsorption of pollutants as well as the key mechanisms of adsorbing water pollutants using MOFs are presented. The use of water‐stable MOFs such as MOF‐235, MIL‐53, MIL‐100, MIL‐101, UiO‐66, ZIF‐67, and ZIF‐8 will be discussed for removing various pollutants. The adsorption efficiency of functionalized MOFs, magnetic MOFs, MOF‐polymer, graphene oxide‐MOF, and CNT‐MOF composites will be reviewed in comparison with commercial adsorbents such as zeolites and activated carbon. As for the conclusion, the challenges and outlooks of applying MOFs and MOF‐based materials for the adsorptive separation of water pollutants are summarized.

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“…Several methods have been documented for the treatment of the effluents containing dyestuffs such as adsorption [6], membrane separation [7], photodegradation [8], and coagulation [9].…”

Section: Introductionmentioning

confidence: 99%

Magnetic Chitosan-Glutaraldehyde/Zinc Oxide/Fe3O4 Nanocomposite: Optimization and Adsorptive Mechanism of Remazol Brilliant Blue R Dye Removal

et al. 2021

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A magnetic Schiff's base chitosan-glutaraldehyde/Fe3O4 composite (CHT-GLA/ZnO/Fe3O4) was developed by incorporating zinc oxide (ZnO) nanoparticles into its structure to prepare an efficient adsorbent for the removal of remazol brilliant blue R (RBBR) dye. The CHT-GLA/ZnO/Fe3O4 was characterized by the following methods: CHN, BET, FTIR, XRD, SEM-EDX, pHpzc, and potentiometric titrations. Box-Behnken design based on response surface methodology was used to optimize the effects of the A: ZnO nanoparticles loading (0-50%), B: dose (0.02-0.1 g), C: pH (4-10), D: temperature (30-60 °C), and time E: (10-60 min) on the synthesis of the magnetic adsorbent and the RBBR dye adsorption. The experimental data of kinetics followed the pseudo-second order model, while isotherms showed better fit to Freundlich and Temkin models. The maximum adsorption capacity of the target nanocomposite (CHT-GLA/Fe3O4 containing 25% ZnO or CHT-GLA/ZnO/Fe3O4-25) was reached of 176.6 mg/g at 60 °C. The adsorption mechanism of RBBR onto CHT-GLA/ZnO/Fe3O4 nanocomposite can be attributed to multi-interactions including electrostatic attractions, hydrogen bonding, Yoshida Hbonding, and n-π interactions. This study offers a promising hybrid nanobiomaterial adsorbent in environmental nanotechnology to separate and remove the contaminants such as organic dyes from wastewater.

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Effect of dye structure on color removal efficiency by coagulation

Cited by 233 publications

References 67 publications

Biomass-Based Adsorbents for Removal of Dyes From Wastewater: A Review

Biomass-Based Adsorbents for Removal of Dyes From Wastewater: A Review

Recent Progress in Adsorptive Removal of Water Pollutants by Metal‐Organic Frameworks

Magnetic Chitosan-Glutaraldehyde/Zinc Oxide/Fe3O4 Nanocomposite: Optimization and Adsorptive Mechanism of Remazol Brilliant Blue R Dye Removal

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