Journal ArticleDOI
Understanding the removal of an anionic dye in textile wastewaters by adsorption on ZnCl2 activated carbons from rice and coffee husk wastes: A combined experimental and theoretical study
Marcela Paredes-Laverde,Maurin Salamanca,Javier D. Diaz-Corrales,Elizabeth Flórez,Javier Silva-Agredo,Ricardo A. Torres-Palma +5 more
TLDR
In this article, the removal efficiency of the obtained adsorbents was tested using indigo carmine (IC) at different pH, as a model dye, in both distilled water and textile wastewater.Abstract:
Activated carbons have been prepared from rice husk (RH) and coffee husk (CH) using ZnCl2 as activating agent. These materials were characterized by thermogravimetric and elemental analysis, infrared spectroscopy (FTIR), the point of zero charge (PZC), scanning electron microscopy (SEM), and nitrogen adsorption. The removal efficiency of the obtained adsorbents was tested using indigo carmine (IC) at different pH, as a model dye, in both distilled water and textile wastewater. The results showed that the dye adsorption on the natural adsorbents and the activated carbons was favorable at acidic pH (3.0). Moreover, the best IC removal in both matrices was reached by the material prepared from CH and activated with ZnCl2 (CH-ZnCl2). This result correlated well with the higher value PZC (7.1), large specific surface area, and porosity characteristics. Additionally, the dye adsorption on the CH-ZnCl2 surface was improved using the smaller particle size and the optimal dose of adsorbent; the adsorptions obtained were much better than those of a commercial activated carbon. Furthermore, the isotherms study showed the adsorption to be monolayer type according to Langmuir and Redlich-Peterson equations. The adsorption kinetics followed a pseudo-second-order kinetic model, and intra-particle diffusion showed that IC adsorption on the surface is faster than inside CH-ZnCl2. The thermodynamic parameters suggest that the IC adsorption is a physical process, which is spontaneous and endothermic. According to density functional theory calculations and experimental FTIR analysis, oxygenated groups and aromatic rings are relevant during the IC adsorption through hydrogen bonds and π-π interactions.read more
Citations
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Recent advances in biochar technology for textile dyes wastewater remediation: A review.
TL;DR: The potential of biochar as an adsorbent, support for catalysis, and a composite catalyst for dye degradation and mineralization is summarized in this paper , which discusses its current research status in the adsorption and degradation of various dyes, incorporates the pertinent advertisersorption variables, encapsulates its regeneration techniques, investigates its engineering applications, and finally analyses limitations and discusses future development prospects.
Journal ArticleDOI
A review on the treatment of dyes in printing and dyeing wastewater by plant biomass carbon.
TL;DR: In this paper , a review summarizes current literature discussing the preparation method and physicochemical characteristics of PBC prepared from different plant species, the effect of the PBC on the removal of dyes, influencing factors affecting the removal, and relevant adsorption models.
Journal ArticleDOI
Green mediated combustion synthesis of copper zinc oxide using Eryngium planum leaf extract as a natural green fuel: Excellent adsorption capacity towards Congo red dye
TL;DR: In this paper , meso/microporous CuO/ZnO nanostructures were synthesized via a green mediated solution combustion method by Eryngium planum leaf extract as natural fuel for the first time.
Journal ArticleDOI
A review on treatment technologies for printing and dyeing wastewater (PDW)
Ugochukwu Ewuzie,Oluwaseyi Damilare Saliu,Kanika Dulta,Samuel Ogunniyi,Abdulhafiz Onipe Bajeh,Kingsley O. Iwuozor,Joshua O. Ighalo +6 more
TL;DR: A review of published literature that utilised various technologies for the treatment of printing and dyeing wastewater is presented in this paper , which shows that advanced oxidation processes is the most viable technique for PDW treatment due to its simplicity, efficiency, scalability, and from the economic point of view.
Journal ArticleDOI
Preparation of activated carbons from fruit residues for the removal of naproxen (NPX): analytical interpretation via statistical physical model
Dison S. P. Franco,Jordana Georgin,Matias Schadeck Netto,Kátia da Boit Martinello,Luis F.O. Silva +4 more
TL;DR: In this article , physical statistical models were employed to provide reasonable information regarding the adsorption of naproxen onto different activated carbons using ZnCl2 as an activator.
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Correction: Corrigendum: The Serum Profile of Hypercytokinemia Factors Identified in H7N9-Infected Patients can Predict Fatal Outcomes
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TL;DR: This Article contains typographical errors in Table 2 where ‘Week 2 (N = 32)’ was incorrectly given as ‘week (n’=2’.
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Efficiency of various recent wastewater dye removal methods: A review
TL;DR: In this article, a review of existing research papers on various biological, chemical and physical dye removal methods to find its efficiency through percentage of dye removal is presented, which highlights enzyme degradation and adsorption (physical) dye removal as these are known as one of the most efficient dye removal techniques these days.
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Correction: Corrigendum: Ligand modified nanoparticles increases cell uptake, alters endocytosis and elevates glioma distribution and internalization
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Agricultural bio-waste materials as potential sustainable precursors used for activated carbon production: A review
TL;DR: A review on the preparation of activated carbon from agricultural waste material is presented in this article, where various physical and chemical processes for the activation of the agricultural residues and their effects on the textural properties such as surface area and pore volume are discussed.