scholarly journals Emerging pollutant mixture mineralization by TiO2 photocatalysts. The role of the water medium

2017 ◽  
Vol 16 (1) ◽  
pp. 60-66 ◽  
Author(s):  
Luca Rimoldi ◽  
Daniela Meroni ◽  
Ermelinda Falletta ◽  
Valentina Pifferi ◽  
Luigi Falciola ◽  
...  
Keyword(s):  
Emerging Pollutants ◽  
Water Medium ◽  
Tio2 Photocatalysts ◽  
Emerging Pollutant ◽  
Water Media

The role played by different water media in the photodegradation of a mixture of four emerging pollutants was investigated.

scholarly journals LC-MSMS based screening of emerging pollutant degradation by different peroxidases

2019 ◽  
Vol 19 (1) ◽  
Author(s):  
Khadega A. Almaqdi ◽  
Rana Morsi ◽  
Bahia Alhayuti ◽  
Farah Alharthi ◽  
S. Salman Ashraf
Keyword(s):  
Organic Pollutants ◽  
Transformation Products ◽  
Emerging Pollutants ◽  
Redox Mediator ◽  
Soybean Peroxidase ◽  
Emerging Pollutant ◽  
Wide Range ◽  
The One ◽  
Treatment Step

Abstract Background The presence of a wide range of bioactive organic pollutants in wastewater and municipal water sources is raising concerns about their potential effects on humans. Not surprisingly, various approaches are being explored that can efficiently degrade these persistent organic pollutants. Use of peroxidases has recently been recognized as a novel remediation approach that may have potential advantages over conventional degradation techniques. However, testing the abilities of different peroxidases to degrade diverse emerging pollutants is tedious and cumbersome. Results In the present study, we present a rapid and robust approach to easily test the degradability of 21 different emerging pollutants by five different peroxidases (soybean peroxidase, chloroperoxidase, lactoperoxidase, manganese peroxidase, and horseradish peroxidase) using an LC-MSMS approach. Furthermore, this approach was also used to examine the role of a redox mediator in these enzymatic degradation assays. Our results show that some of the organic pollutants can be easily degraded by all five of the peroxidases tested, whereas others are only degraded by a specific peroxidase (or when a redox mediator was present) and there are some that are completely resistant to degradation by any of the peroxidases tested (even in the presence of a redox mediator). The degradation of furosemide and trimethoprim by soybean peroxidase and chloroperoxidase, respectively, was investigated in detail by examining the transformation products generated during their degradation. Some of the products generated during enzymatic breakdown of these pollutants have been previously reported by others, however, we report many new transformation products. Conclusions LC-MSMS approaches, like the one described here, can be used to rapidly evaluate the potential of different peroxidases (and redox requirements) to be used as bioremediation agents. Our preliminary result shows peroxidases hold tremendous potential for being used in a final wastewater treatment step.

scholarly journals Efficient Degradation of 2-Mercaptobenzothiazole and Other Emerging Pollutants by Recombinant Bacterial Dye-Decolorizing Peroxidases

Biomolecules ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 656
Author(s):  
Aya Alsadik ◽  
Khawlah Athamneh ◽  
Ahmed F. Yousef ◽  
Iltaf Shah ◽  
Syed Salman Ashraf
Keyword(s):  
Emerging Pollutants ◽  
Dramatic Improvement ◽  
Wastewater Remediation ◽  
New Class ◽  
Remediation Strategies ◽  
Emerging Pollutant ◽  
Liquid Chromatography Tandem Mass ◽  
First Time ◽  
Harmful Effects

In recent years, concerns are being raised about the potential harmful effects of emerging pollutants (EPs) on human and aquatic lives. Extensive research is being conducted on developing efficient remediation strategies to target this new class of toxic pollutants. Studies focused on biological (enzyme-based) methods have shown potential as greener and possibly more economical alternatives to other treatment approaches, such as chemical methods. The current study focused on the use of recombinantly produced novel bacterial peroxidases, namely dye-decolorizing peroxidases (DyPs), to study their effectiveness in degrading a number of diverse EPs. In this context, a sensitive bioanalytical Liquid chromatography—tandem mass spectrometry (LCMSMS)-based method was developed to simultaneously detect a mixture of 31 EPs and to examine their degradability by a panel of seven different recombinant bacterial DyPs (rDyPs). We show that up to 9 of the 31 tested EPs could be degraded by at least one of the DyPs tested. The results also indicated that not all rDyPs behaved similarly in their abilities to degrade EPs, as some rDyPs (such as SviDyP and CboDyP) showed a promising potential to degrade EPs while others (such as ScDyP) were almost ineffective. Additionally, the role of redox mediators for effective emerging pollutant degradation by rDyPs was also examined, which showed dramatic improvement in the DyP-mediated degradation of five different EPs. Detailed analysis of 2-mercaptobenzothiazole degradation by SviDyP showed that six distinct breakdown products were generated. The present study showed for the first time that recombinant bacterial DyPs can be used for wastewater remediation by degrading a range of different EPs.

scholarly journals Removal of Emerging Pollutants from Water Using Environmentally Friendly Processes: Photocatalysts Preparation, Characterization, Intermediates Identification and Toxicity Assessment

Nanomaterials ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 215
Author(s):  
Nina Finčur ◽  
Paula Sfîrloagă ◽  
Predrag Putnik ◽  
Vesna Despotović ◽  
Marina Lazarević ◽  
...  
Keyword(s):  
Emerging Contaminants ◽  
Sol Gel ◽  
Toxicity Assessment ◽  
Emerging Pollutants ◽  
Simulated Sunlight ◽  
Aquatic Life ◽  
Mgo Nanoparticles ◽  
Emerging Pollutant ◽  
Wheat Germination ◽  
Modern Technologies

Pharmaceuticals and pesticides are emerging contaminants problematic in the aquatic environment because of their adverse effects on aquatic life and humans. In order to remove them from water, photocatalysis is one of the most modern technologies to be used. First, newly synthesized photocatalysts were successfully prepared using a sol–gel method and characterized by different techniques (XRD, FTIR, UV/Vis, BET and SEM/EDX). The photocatalytic properties of TiO2, ZnO and MgO nanoparticles were examined according to their removal from water for two antibiotics (ciprofloxacin and ceftriaxone) and two herbicides (tembotrione and fluroxypyr) exposed to UV/simulated sunlight (SS). TiO2 proved to be the most efficient nanopowder under UV and SS. Addition of (NH4)2S2O8 led to the faster removal of both antibiotics and herbicide fluroxypyr. The main intermediates were separated and identified for the herbicides and antibiotic ciprofloxacin. Finally, the toxicity of each emerging pollutant mixture and formed intermediates was assessed on wheat germination and biomass production.

scholarly journals New Eco-Materials Derived from Waste for Emerging Pollutants Adsorption: The Case of Diclofenac

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 3964
Author(s):  
Ario Fahimi ◽  
Alessandra Zanoletti ◽  
Stefania Federici ◽  
Ahmad Assi ◽  
Fabjola Bilo ◽  
...  
Keyword(s):  
Fly Ash ◽  
Wastewater Treatment Plants ◽  
Coal Fly Ash ◽  
Bottom Ash ◽  
Emerging Pollutants ◽  
Emerging Pollutant ◽  
Pharmaceutical Removal ◽  
Heating Treatment ◽  
Sustainable Materials ◽  
Potential Use

This work proposes new eco-materials for the adsorption of diclofenac (DCF). The large consumption of this nonsteroidal anti-inflammatory drug combined with the inefficiency of wastewater treatment plants (WWTPs) leads to its presence in aquatic environments as an emerging pollutant. The adsorption technique is widely used for pharmaceutical removal. Moreover, due to the large effect of commercial adsorbents, in the frame of the Azure Chemistry approach, new sustainable materials are mandatory for removal as emerging pollutants. The work proposes three adsorbents that were obtained from different stabilization methods of fly ash derived from an incinerator plant; the stabilization techniques involved the use of various industrial by-products such as bottom ash, flue gas desulphurization residues, coal fly ash, and silica fume. The best performance, although less than activated carbon, was obtained by COSMOS (COlloidal Silica Medium to Obtain Safe inert: the case of incinerator fly ash), with a removal efficacy of approximately 76% with 15 g/L of material. Several advantages are expected not only from the DCF removal but also from an economic perspective (the newly obtained adsorbents are eco-materials, so they are cheaper in comparison to conventional adsorbents) and in terms of sustainability (no toxic reagents and no heating treatment are involved). This work highlights the adsorption performance of the new eco-materials and their potential use in WWTPs.

scholarly journals Role of reactive oxygen species on the activity of noble metal-doped TiO2 photocatalysts

2019 ◽  
Vol 372 ◽  
pp. 45-51 ◽  
Author(s):  
Paula Ribao ◽  
Juan Corredor ◽  
Maria J. Rivero ◽  
Inmaculada Ortiz
Keyword(s):  
Reactive Oxygen Species ◽  
Noble Metal ◽  
Reactive Oxygen ◽  
Oxygen Species ◽  
Tio2 Photocatalysts ◽  
Doped Tio2 ◽  
Metal Doped

scholarly journals Comparation Between Mac conkey and Coconut Water Medium as a Growth Medium for Escherichia coli

2021 ◽  
Vol 3 (1) ◽  
pp. 19-25
Author(s):  
Endah Prayekti ◽  
Suliati Suliati ◽  
Dwi Agustin Wulandari
Keyword(s):  
Escherichia Coli ◽  
Growth Medium ◽  
Coconut Water ◽  
Growth Media ◽  
Water Medium ◽  
E Coli ◽  
Commercial Media ◽  
Randomized Design ◽  
Significant Difference ◽  
Water Media

Escherichia coli is the bacteria that can cause diarrhea in humans and often used as a parameter of stool environmental pollution. Culture of E. coli from the sample often requires Mac Conkey as commercial media which is able to distinguish it from other bacteria in the Enterobacteriaceae group. Commercial media such as Mac Conkey certainly has a price that is quite expensive because of its ability as a growth medium for Enterobacteriaceae. Therefore, in the study tested natural ingredients that can be used for growth media, such as coconut water. The purpose of this study was to compare the ability of Mac Conkey media and coconut water to support the growth of E. coli. This research is an experimental study with a completely randomized design. The concentration of coconut water tested was 0%, 20%, 40%, 60%, 80%, and 100%. The results showed that at the concentration of coconut water 20% to 60% the number of E. coli colonies on coconut water media was slightly below the Mac Conkey Agar media, while in coconut water a concentration of 80% showed a greater number of colonies than Mac Conkey. The Mann Whitney test showed a significant difference between the number of colonies on 80% coconut water media and Mac Conkey Agar, which was equal to 0.004 (p < 0.05). Based on these results, coconut water has the potential to be used as a growth medium for E. coli.

Role of the Water Medium in the Process of Signal Transmission from Peptides to Cellular Receptors

2001 ◽  
pp. 855-856
Author(s):  
Evgueny I. Grigoriev ◽  
Vladimir Kh. Khavinson ◽  
Igor N. Kochnev ◽  
Alexey E. Grigoriev
Keyword(s):  
Signal Transmission ◽  
Water Medium ◽  
Cellular Receptors
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