scholarly journals New Sustainable Approach for the Production of Fe3O4/Graphene Oxide-Activated Persulfate System for Dye Removal in Real Wastewater

Water ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 733 ◽  
Author(s):  
Md. Nahid Pervez ◽  
Wei He ◽  
Tiziano Zarra ◽  
Vincenzo Naddeo ◽  
Yaping Zhao
Keyword(s):  
Graphene Oxide ◽  
Heterogeneous Catalysts ◽  
Degradation Mechanism ◽  
Operational Parameters ◽  
Solution Ph ◽  
Dye Pollutants ◽  
Water Purification System ◽  
Purification System ◽  
Real Wastewater ◽  
Activated Persulfate

Persulfate (PS)-activated, iron-based heterogeneous catalysts have attracted significant attention as a potential advanced and sustainable water purification system. Herein, a novel Fe3O4 impregnated graphene oxide (Fe3O4@GO)-activated persulfate system (Fe3O4@GO+K2S2O8) was synthesized by following a sustainable protocol and was tested on real wastewater containing dye pollutants. In the presence of the PS-activated system, the degradation efficiency of Rhodamine B (RhB) was significantly increased to a level of ≈95% compared with that of Fe3O4 (≈25%). The influences of different operational parameters, including solution pH, persulfate dosage, and RhB concentration, were systemically evaluated. This system maintained its catalytic activity and durability with a negligible amount of iron leached during successive recirculation experiments. The degradation intermediates were further identified through reactive oxygen species (ROS) studies, where surface-bound SO4− was found to be dominant radical for RhB degradation. Moreover, the degradation mechanism of RhB in the Fe3O4@GO+K2S2O8 system was discussed. Finally, the results indicate that the persulfate-activated Fe3O4@GO catalyst provided an effective pathway for the degradation of dye pollutants in real wastewater treatment.

Structurally engineered TiO2–SiO2 monolithic designs for the enhanced photocatalytic degradation of organic textile dye pollutants

2017 ◽  
Vol 10 (02) ◽  
pp. 1750006 ◽  
Author(s):  
T. V. L. Thejaswini ◽  
D. Prabhakaran ◽  
M. Akhila Maheswari
Keyword(s):  
Pore Volume ◽  
High Surface ◽  
High Surface Area ◽  
Textile Dye ◽  
Operational Parameters ◽  
Solution Ph ◽  
Dye Pollutants ◽  
Bet Analysis ◽  
Rapid Removal ◽  
Catalyst Dosage

The rapid removal of organic textile dye (Acid Red-85) using mesoporous TiO2–SiO2 monoliths as photocatalyst material has been studied. The 7:3 mole% ratios of TiO2 and SiO2 within the framework provided a well-ordered cage-like monolithic design with high surface area and pore volume that facilitated faster and efficient degradation of the dye effluents. The photocatalyst has been characterized using XRD, TEM-SAED, UV–Vis-DRS, PL, TGA and BET analysis. The influence of various photocatalytic operational parameters, such as solution pH, dopant stoichiometry, catalyst dosage, dye concentration, kinetics, photo-oxidizers, etc., which could influence on the degradation efficiency, has been studied.

scholarly journals Functionalized Graphene Derivatives and TiO2 for High Visible Light Photodegradation of Azo Dyes

Nanomaterials ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 1106 ◽  
Author(s):  
Álvaro Pérez-Molina ◽  
Sergio Morales-Torres ◽  
Francisco J. Maldonado-Hódar ◽  
Luisa M. Pastrana-Martínez
Keyword(s):  
Photocatalytic Activity ◽  
Graphene Oxide ◽  
Photocatalytic Performance ◽  
Degradation Mechanism ◽  
Degradation Pathway ◽  
Functionalized Graphene ◽  
Solution Ph ◽  
Simulated Solar Light ◽  
Graphene Derivatives ◽  
Repulsive Forces

Functionalized graphene derivatives including graphene oxide (GO), reduced graphene oxide (rGO), and heteroatom (nitrogen/sulphur (N/S) or boron (B))-doped graphene were used to synthesize composites with TiO2 (T). The photocatalytic performance of composites was assessed for the degradation of Orange G dye (OG) under simulated solar light. All the prepared graphene derivatives—TiO2 composites showed better photocatalytic performance than bare TiO2. A higher photocatalytic activity was found for the composites containing GO and N/S co-doped rGO (kapp = 109.2 × 10−3 and 48.4 × 10−3 min−1, for GO-T and rGONS-T, respectively). The influence of both initial solution pH and the reactive species involved in the OG degradation pathway were studied. The photocatalytic activity of the samples decreased with the increase of the initial pH (from 3.0 to 10.0) due to the occurrence of electrostatic repulsive forces between the photocatalysts surface and the molecules of OG, both negatively charged. The use of selective scavengers showed that although the photogenerated holes dominate the degradation mechanism, radicals and singlet oxygen also participate in the OG degradation pathway. In addition, reutilization experiments indicated that the samples were stable under the reaction conditions used.

scholarly journals Efficient Degradation of Mordant Blue 9 Using the Fenton-Activated Persulfate System

Water ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2532 ◽  
Author(s):  
Md. Nahid Pervez ◽  
Felix Y. Telegin ◽  
Yingjie Cai ◽  
Dongsheng Xia ◽  
Tiziano Zarra ◽  
...  
Keyword(s):  
Butyl Alcohol ◽  
Textile Dye ◽  
Oh Radicals ◽  
Operational Parameters ◽  
Reaction Conditions ◽  
Tert Butyl Alcohol ◽  
Initial Ph ◽  
Fe Complex ◽  
Optimal Reaction ◽  
Activated Persulfate

In this study, a Fenton-activated persulfate (Fe2+/PS) system was introduced for the efficient degradation of Mordant Blue 9 (MB 9) as a textile dye in an aqueous solution. Results showed that the degradation of MB 9 was markedly influenced by operational parameters, such as initial pH, PS concentration, Fe2+ concentration, and initial dye concentration. Optimal reaction conditions were then determined. Inorganic anions, such as Cl− and HCO3−, enhanced the degradation efficiency of MB 9 under optimal conditions. Addition of HCO3− reduced the degradation performance of MB 9, whereas the addition of Cl− increased the degradation percentage of MB 9. In addition, quenching experiments were conducted using methanol and tert-butyl alcohol as scavengers, and methanol was identified as an effective scavenger. Thus, the degradation of MB 9 was attributed to S O 4 • − and •OH radicals. The degradation and mineralization efficiency of MB 9 was significantly reduced using the conventional Fenton process i.e., Fe2+/ hydrogen peroxide (HP) because of the formation of a Fe complex during degradation. Meanwhile, the Fe2+/persulfate (PS) system improved the degradation and mineralization performance.

Household water purification system comprising cartridge filtration, UVC disinfection and chlorination to treat turbid raw water

2021 ◽  
Vol 43 ◽  
pp. 102203
Author(s):  
Paulo Marcos Faria Maciel ◽  
Natália de Melo Nasser Fava ◽  
Antônio Wagner Lamon ◽  
Pilar Fernandez-Ibañez ◽  
John Anthony Byrne ◽  
...  
Keyword(s):  
Water Purification ◽  
Raw Water ◽  
Water Purification System ◽  
Purification System ◽  
Household Water

Isolation of Immunoglobulin from Chicken Egg Yolk using Single-Stage Ultrafiltration with 100-kDa Regenerated Cellulose Membranes

2011 ◽  
Vol 7 (1) ◽  
Author(s):  
Jianguo Liu ◽  
Juan Yang ◽  
Hai Xu ◽  
Hu Zhu ◽  
Jianbo Qu ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Egg Yolk ◽  
Single Stage ◽  
Regenerated Cellulose ◽  
Cellulose Membrane ◽  
Permeate Flux ◽  
Operational Parameters ◽  
Solution Ph ◽  
Chicken Egg ◽  
Chicken Egg Yolk

The aim of this work is to develop a membrane-based cost-effective process for the rapid isolation of immunoglobulin from chicken egg yolk. It was found that a single-stage ultrafiltration using a 100 kDa molecular weight cut-off regenerated cellulose membrane could be employed to isolate immunoglobulin from the crude feedstock. The effects of operational parameters (solution pH, ionic strength, stirring speed and permeate flux) on the transmission of immunoglobulin and the presence of impurity protein with molecular weight close to immunoglobulin were quantified using the parameter scanning ultrafiltration technique. Under optimized conditions, the purity of immunoglobulin obtained was about 85 percent after the single-stage ultrafiltration process, and the recovery of immunoglobulin from the feedstock was 91 percent.

Experimental estimation of the efficiency of removing residual amounts of antibiotics and steroid hormones from water with home water purification systems

2021 ◽  
pp. 9-15
Author(s):  
Ю.А. Ремизова ◽  
А.П. Голованова ◽  
Д.А. Рудакова ◽  
А.Г. Митилинеос
Keyword(s):  
Water Purification ◽  
High Efficiency ◽  
Tap Water ◽  
Pharmaceutical Compounds ◽  
Model Solution ◽  
Capital Costs ◽  
Water Purification System ◽  
Purification System ◽  
Household Water ◽  
Purification Methods

Для удаления остаточных количеств фармацевтических соединений, присутствующих в питьевой воде, на всех этапах водоподготовки могут применяться разнообразные способы очистки, основанные на различных физико-химических принципах. В работе приведены результаты экспериментального исследования эффективности удаления с помощью бытовой стационарной системы водоочистки остаточных количеств фармацевтических препаратов – антибиотика левомицетина (хлорамфеникола) и стероидного гормона эстрона – из модельного раствора, приготовленного на основе водопроводной воды с добавлением лекарственных препаратов. Показано, что бытовая система водоочистки обладает способностью существенно снижать остаточные концентрации фармацевтических препаратов левомицетина и эстрона на всем протяжении заявленного производителем ресурса. В секторе бытовой водоочистки установки адсорбционного типа по-прежнему остаются наиболее востребованным типом водоочистных систем, обеспечивающих высокую эффективность удаления различных загрязнителей при минимальных капитальных затратах. To remove residual amounts of pharmaceutical compounds present in drinking water, a variety of purification methods based on various physicochemical principles can be used at all stages of water treatment. The paper presents the results of an experimental study of the efficiency of removing residual concentrations of pharmaceuticals – laevomycetin antibiotic (chloramphenicol) and estrone steroid hormone – from a model solution prepared on the basis of tap water with the addition of drugs, using a home fixed water purification system. It is shown that the home water purification system provides for the significant reduction of residual concentrations of chloramphenicol and estrone throughout the service life declared by the manufacturer. In the household water purification sector, adsorption-type units are still the most in-demand type of water purification systems that provide for the high efficiency in removing various pollutants with minimal capital costs.

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