Recent advances for dyes removal using novel adsorbents: A review

Zhou, Yanbo; Lu, Jian; Zhou, Yi; Liu, Yongdi

doi:10.1016/j.envpol.2019.05.072

Cited by 952 publications

(412 citation statements)

References 140 publications

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“…Wastewater treatment before its discharge into environmental compartments is imperative to ensure environmental safety and diminish the human health impacts associated to these dyes. Adsorption has shown to be one of the most efficient options due to the fact of its potentially low economic and environmental impacts and high capacity for up-scaling to industrial levels [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Char from Spent Tire Rubber: A Potential Adsorbent of Remazol Yellow Dye

Nogueira

Matos

Bernardo

et al. 2019

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A char produced from spent tire rubber showed very promising results as an adsorbent of Remazol Yellow (RY) from aqueous solutions. Spent tire rubber was submitted to a pyrolysis process optimized for char production. The obtained char was submitted to chemical, physical, and textural characterizations and, subsequently, applied as a low-cost adsorbent for dye (RY) removal in batch adsorption assays. The obtained char was characterized by relatively high ash content (12.9% wt), high fixed-carbon content (69.7% wt), a surface area of 69 m2/g, and total pore volume of 0.14 cm3/g. Remazol Yellow kinetic assays and modelling of the experimental data using the pseudo-first and pseudo-second order kinetic models demonstrated a better adjustment to the pseudo-first order model with a calculated uptake capacity of 14.2 mg RY/g char. From the equilibrium assays, the adsorption isotherm was fitted to both Langmuir and Freundlich models; it was found a better fit for the Langmuir model to the experimental data, indicating a monolayer adsorption process with a monolayer uptake capacity of 11.9 mg RY/g char. Under the experimental conditions of the adsorption assays, the char presented positive charges at its surface, able to attract the deprotonated sulfonate groups (SO3−) of RY; therefore, electrostatic attraction was considered the most plausible mechanism for dye removal.

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Section: Introductionmentioning

confidence: 99%

Char from Spent Tire Rubber: A Potential Adsorbent of Remazol Yellow Dye

Nogueira

Matos

Bernardo

et al. 2019

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“…Adsorbent dosage is the major factor that significantly influences the economic viability and efficiency of an adsorption process [43]. The effect of CHCA adsorbent dosage on removal of dyes was studied in the concentration range of 0.1-1 g l −1 for CR and 0.3-3 g/l for IC with an initial concentration of 100 mg l −1 and 50 mg l −1 of CR and IC, respectively.…”

Section: Effect Of Adsorbent Dosagementioning

confidence: 99%

Solution combustion synthesis of calcium aluminate nanocomposite using coffee husk extract as green fuel and its application in adsorptive amputation of anionic dyes

Murthy

Gowrishankar

Chandraprabha

et al. 2020

Mater. Res. Express

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Solution combustion synthesis of calcium aluminate (CaAl 2 O 4 ) nanocomposite using coffee husk extract and its adsorption capacity for removal of Congo red (CR) and Indigo carmine (IC) are reported. Physiochemical properties of adsorbent were studied by PXRD, SEM, TEM and point of zero charge. Batch adsorption studies were conducted to study the effect of adsorbent dosage, pH, contact time, initial dye concentration and temperature on adsorption efficiency of coffee husk derived calcium aluminate nanocomposite (CHCA). Among the isotherms used, Langmuir model explained best the equilibrium data and the maximum monolayer adsorption capacity was found to be 377 and 135 mg/g for CR and IC, respectively. Mass transfer analysis indicated adsorptive removal of dyes was controlled by both external and internal diffusion. Pseudo-first-order model fitted best with experimental kinetic data and adsorption efficiency increased with an increase in the initial bulk concentration of CR and IC. Thermodynamic analysis indicated that adsorption of CR and IC on CHCA is feasible, spontaneous and exothermic in nature. The magnitude of enthalpy and heat of adsorption suggested that the adsorption is physical in nature. The present study explores the potential of coffee husk extract, an agro-based bio-waste, as a novel and eco-friendly fuel in the synthesis of CHCA and the synthesised nanocomposite as a potential adsorbent for the removal of synthetic dyes.

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“…8 Many kinds of absorbents are commercially available for specic pollutant removal applications. 5,13,14 For example, activated carbon (AC) is frequently applied to remove heavy metals and other pollutants owing to its high surface area and mesoand micro-porosity. Nevertheless, AC is conventionally prepared from non-renewable coal, which raises the cost and results in difficulty during disposal and regeneration.…”

Section: Introductionmentioning

confidence: 99%