EXPERIMENTAL ASSESMENT OF NANOFILTRATION FOR THE REMOVAL OF CHLOROPHENOLS FROM AQUEOUS EFFLUENTS

Abstract Araucaria angustifolia bark (AA-bark), a waste generated in wood processing, was evaluated as a potential adsorbent to remove Gentian Violet (GV) dye from aqueous solutions. The AA-bark presented an amorphous structure with irregular surface and was composed mainly of lignin and holocellulose. These characteristics indicated that the adsorbent contains available sites to accommodate the dye molecules. The GV adsorption on AA-bark was favored at pH 8.0 with adsorbent dosage of 0.80 g L−1. Pseudo-nth order model was adequate to represent the adsorption kinetics of GV on AA-bark. A fast adsorption rate was verified, with the equilibrium being attained within 30 min. Equilibrium data were well represented by the Langmuir model. The maximum adsorption capacity was 305.3 mg g−1. Adsorption was spontaneous, favorable and endothermic. AA-bark was able to treat a simulated dye house effluent, reaching color removal values of 80%. An excellent performance was found in fixed bed experiments, where the length of the mass transfer zone was only 5.38 cm and the breakthrough time was 138.5 h. AA-bark can be regenerated two times using HNO3 0.5 mol L−1. AA-bark can be used as a low-cost material to treat colored effluents in batch and fixed bed adsorption systems.

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Removal of Remazol Rosso RB Dye from Aqueous Effluents by Homogenous Fenton Oxidation Processes

Chemistry Journal of Moldova ◽

10.19261/cjm.2014.09(1).08 ◽

2014 ◽

Vol 9 (1) ◽

pp. 74-79

Author(s):

Carmen Zaharia ◽

Victoria Fedorcea ◽

Adrian Beda ◽

Victor Amarandei ◽

Augustin Muresan

Keyword(s):

Fenton Oxidation ◽

Oxidation Processes ◽

Aqueous Effluents

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Remediation of Diethyl Phthalate in Aqueous Effluents with TiO2-Supported Rh0 Nanoparticles as Multicatalytic Materials

Catalysts ◽

10.3390/catal11101166 ◽

2021 ◽

Vol 11 (10) ◽

pp. 1166

Author(s):

Audrey Denicourt-Nowicki ◽

Carl-Hugo Pélisson ◽

Isabelle Soutrel ◽

Lidia Favier ◽

Alain Roucoux

Keyword(s):

Aromatic Ring ◽

Endocrine Disrupting Compounds ◽

Diethyl Phthalate ◽

Aquatic Environments ◽

Wet Impregnation ◽

Advanced Material ◽

Endocrine Disrupting ◽

Arene Hydrogenation ◽

Aqueous Effluents

An innovative “domino” process, based on an arene hydrogenation followed by a photocatalytic step, was designed for the remediation of endocrine disrupting compounds, in highly concentrated aqueous effluents. The novelty relies on the use of TiO2-supported zerovalent Rh nanoparticles as multicatalytic materials (MCMs) for this two-step treatment, applied on diethyl phthalate, which is a model aromatic pollutant frequently present in aquatic environments. This nanocomposite advanced material, which was easily prepared by a green, wet impregnation methodology, proved to be active in the successive reactions, the reduction in the aromatic ring, and the photodegradation step. This sustainable approach offers promising alternatives in the case of photoresistive compounds.

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Science and Technology Roadmap for Adsorption of Metallic Contaminants from Aqueous Effluents Using Biopolymers and Its’ Derivatives

10.1007/978-3-030-83811-9_9 ◽

2021 ◽

pp. 165-196

Author(s):

Ahmed Elsayid Ali ◽

Zaira Zaman Chowdhury ◽

Rahman F. Rafique ◽

Rabia Ikram ◽

Abu Nasser Mohammad Faisal ◽

...

Keyword(s):

Science And Technology ◽

Technology Roadmap ◽

Aqueous Effluents ◽

Metallic Contaminants

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Modeling the removal of Reactive Red 120 dye from aqueous effluents by activated carbon

Water Science & Technology ◽

10.2166/wst.2020.347 ◽

2020 ◽

Vol 82 (4) ◽

pp. 651-662

Author(s):

Kods Oueslati ◽

Eder C. Lima ◽

Fakher Ayachi ◽

Mariene R. Cunha ◽

Abdelmottaleb Ben Lamine

Keyword(s):

Activated Carbon ◽

Adsorption Isotherms ◽

Statistical Physics ◽

Adsorption Process ◽

Dye Adsorption ◽

Physical Nature ◽

Experimental Conditions ◽

Reactive Red 120 ◽

Receptor Sites ◽

Aqueous Effluents

Abstract The adsorption isotherms of Reactive Red 120 (RR-120) on Brazilian pine-fruit shell activated carbon, at six temperatures (298, 303, 308, 313, 318 and 323 K) and pH = 6, were determined and interpreted using a double layer model with one energy. A statistical physics treatment established the formulation of this model. Steric and energetic parameters related to the adsorption process, such as the number of adsorbed molecules per site, the receptor sites density and the concentration at half-saturation, have been considered. Thermodynamic potential functions such as entropy, internal energy and Gibbs free enthalpy are analyzed, and the choice of the models is based on assumptions in correlation with experimental conditions. By numerical fitting, the investigated parameters were deduced. The theoretical expressions provide a good understanding and interpretation of the adsorption isotherms at the microscopic level. We believe that our work contributes to new theoretical insights on the dye adsorption in order to know the physical nature of the adsorption process.

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