Treatment of dairy wastewater by electrocoagulation process: Advantages of combined iron/ aluminum electrodes

Uncategorized

B. CHEZEAU, L. BOUDRICHE, C. VIAL, A. BOUDJEMAA

Received 23 Feb 2019, Accepted 28 Jun 2019, Published online: 15 Jul 2019

JJournal Separation Science and Technology 

ABSTRACT

The objective was to assess the efficiency of electrode material in an electrocoagulation (EC) process for wastewater treatment by comparing the efficiency of aluminum (Al–Al), iron (Fe–Fe) and combined Fe–Al electrodes. The treatment of synthetic dairy wastewater, characterized by high levels of 5-day biological oxygen demand (BOD5) and chemical oxygen demand (COD), was used to compare electrode materials. Experimental results showed that all electrodes materials achieved the same final removal yield in the range of current studied (55% COD, 60% total organic carbon, 90% total nitrogen, and nearly 100% turbidity) when equilibrium was achieved. But at fixed current density and initial concentration of dairy waste, the Al–Al assembly exhibited the fastest elimination, whereas the slowest removal rate was observed with the Fe–Fe electrodes, even though adsorption was always the main removal mechanism. Finally, an Fe–Al system using an Fe anode with an Al cathode emerged as a techno-economic trade-off because of the low price of iron: both metals contributed to the removal of dairy waste, and the treatment time to achieve equilibrium values was closer to the Al–Al assembly at fixed current density. Moreover, experimental results proved the additivity of the mechanisms reported for Al–Al and Fe–Fe systems with Fe–Al.

KEYWORDS: ElectrocoagulationCOD removalDairy effluentElectrode materialWastewater treatmen

DOI: https://doi.org/10.1080/01496395.2019.1638935

Synthesis of Amphiphilic Diblock Copolymer and Study of Their Self-assembly in Aqueous Solution

Publication Scientifique

W. CHAIBI, K. GUEMRA

Published online: 03 Aug 2020

Journal of Inorganic and Organometallic Polymers and Materials

Abstract

This paper describes the synthesis of novel amphiphilic diblock copolymer composed of polystyrene (PS) as the hydrophobic block and Poly(N-[3-(dimethylamino)propyl] methacrylamide) (PDMAPMA) as hydrophilic block by reverse-mode iodine transfer controlled radical polymerization (RITP). Initially, homopolymer based on activated monomers (styrene) was synthesized by RITP. Thereafter, amphiphilic diblock copolymer was synthesized. The diblock copolymer obtained was characterized by spectroscopic methods: FTIR, 1H NMR, 13C NMR, Energy-dispersive X-ray spectroscopy (EDX) to analyze the elemental composition. Their thermal behaviour was investigated by thermogravimetric analysis (TGA). Study of the self-organization in aqueous phase of the amphiphilic copolymer revealed that formation of micelles for concentrations was higher than critical aggregation concentration (CAC) which their values were determined by tensiometry. The self-assembly behaviors of this copolymer was studied in aqueous solution at different concentrations, PH and temperatures using Dynamic light scattering (DLS).

DOI: https://doi.org/10.1007/s10904-020-01464-2

Antimalarial-agent artemisinin and derivativesportray more potentbinding to Lys353 and Lys31-binding hotspots of SARS-CoV-2 spikeproteinthanhydroxychloroquine: potentialrepurposing of artenimol for COVID-19

Publication Scientifique

M. SEHAILIA ,  S. CHEMAT

Received 21 Apr 2020, Accepted 06 Jul 2020, Published online: 22 Jul 2020


Journal», Journal of Biomolecular Structure and Dynamics, Volume 55, 2020 – Issue 14

ABSTRACT:

Abstract

Medicinal herbs have proved along history to be a source of multiple cures. In this paper, we demonstrate how hydroxychloroquine can act as a good inhibitor of SARS-CoV-2 Spike protein receptor-binding-domain using molecular docking studies. We also unveil how hydroxychloroquine can interfere in the prevention of Lys353 in hACE2 from interacting with the corresponding binding hotspot present on the Spike protein. Further screening of artemisinin & derived compounds produced better Vina docking score than hydroxychloroquine (-7.1 kcal mol−1 for artelinic acid vs. −5.5 kcal mol−1 for hydroxychloroquine). Artesunate, artemisinin and artenimol, showed two mode of interactions with Lys353 and Lys31 binding hotspots of the Spike protein. Molecular dynamics analysis confirmed that the formed complexes are able to interact and remain stable in the active site of their respective targets. Given that these molecules are effective antivirals with excellent safety track records in humans against various ailment, we recommend their potential repurposing for the treatment of SARS-CoV-2 patients after successful clinical studies. In addition, an extraction protocol for artemisinin from Artemisia annua L. is proposed in order to cope with the potential urgent global demand.

KEYWORDS: