ZnO-Porphyrin Composite Nanostructures as Discriminating Adducts for Metallic Ions in Aqueous Matrices

2016 ◽  
Vol 1 (15) ◽  
pp. 4690-4695 ◽  
Author(s):  
Gabriele Giancane ◽  
Simona Bettini ◽  
Rosanna Pagano ◽  
Ludovico Valli
Keyword(s):  
Metallic Ions ◽  
Composite Nanostructures ◽  
Aqueous Matrices

Influence of Applied Phytosanitary Treatments and Climatic Crop Year on Zinc Content in Wines from Tohani Vineyard

2017 ◽  
Vol 68 (9) ◽  
pp. 2092-2097
Author(s):  
Catalina Calin ◽  
Gina Vasile Scaeteanu ◽  
Roxana Maria Madjar ◽  
Otilia Cangea
Keyword(s):  
Zinc Content ◽  
Soil Samples ◽  
Limit Set ◽  
Red Wines ◽  
Metallic Ions ◽  
Sauvignon Blanc ◽  
Before And After ◽  
Haze Formation ◽  
Zinc Levels ◽  
Concentration Levels

Metallic ions present a great importance in oenological practice and usually are present in wines in levels that are not hazardous. Among all metallic ions, zinc presents a great interest because may cause the persistence of the wine sour taste and by the side of Al, Cu, Fe and Ni, contribute to the haze formation and the change of color. The present study was focused on measuring the concentration levels of mobile zinc from vineyard soil before and after phytosanitary treatments and zinc content from white (Feteasca Alba - FA, Riesling Italian - RI, Sauvignon Blanc - SB, Tamaioasa Rom�neasca - TR), rose (Busuioaca de Bohotin - BB) and red (Feteasca Neagra - FN) wines within the wine-growing Tohani area, Romania. Other objective was to investigate of the influence of crop year and variety on zinc levels found in wine samples. Mobile zinc content for all analyzed soil samples is low ([1.5 mg/kg). Analyses indicated that zinc content found in wines was below 5 mg/L, limit set by Organisation Internationale of Vine and Wine (OIV). Also, it was found that red wines contain zinc in higher concentrations than white ones.

The Effect of Metallic and Ionic Species on the Performance of a Biological Effluent Treatment System

1977 ◽  
Vol 12 (1) ◽  
pp. 191-212
Author(s):  
B. Volesky ◽  
Q. Samak ◽  
P. Waller
Keyword(s):  
Activated Sludge ◽  
Inorganic Ions ◽  
Industrial Effluents ◽  
Original Data ◽  
Ionic Species ◽  
Threshold Concentration ◽  
Effluent Treatment ◽  
Organic Load ◽  
Metallic Ions ◽  
Activated Sludge Systems

Abstract Review of the available results appearing in the recent literature is presented focusing particularly upon the effects of metallic ions such as Cr, Cu, Zn, Cd, Hg, V, Zn, Ni and Co. Some original data involving the effects of Na are presented and discussed. Development of parameters used in evaluating the influence of toxic or inhibitory species on the mixed microbial population of an activated sludge system is of crucial importance and different techniques employed such as BOD-COD-TOC-removal rates, Oxygen Uptake Rate, and others are discussed, showing relative inadequacy of currently applied assays. From the data available, certain trends can be discerned. There is a definite threshold concentration for each metallic ion, depending on the organic load of the feed. In the order of increasing toxicity to activated sludge systems reflected in lower BOD removals the following metals have been listed as inhibiting factors at concentrations starting from 1 ppm applied on a continuous basis: hexavalent chromium, cobalt, zinc, cadmium, trivalent chromium, copper and nickel. Metals in combination have not been reported to exhibit any significantly different effects as compared to those observed with individually introduced metallic ions. Tolerance of some activated sludge systems to shock loadings by various inorganic ions and metals is reviewed. The conclusions are of particular importance for estimating the performance of biox systems handling industrial effluents which are likely to contain toxic components of inorganic or metallic nature.

Electrolysis of Wastewater - A Laboratory Study

1975 ◽  
Vol 10 (1) ◽  
pp. 214-223
Author(s):  
N.S. Wei ◽  
G.W. Heinke
Keyword(s):  
Energy Source ◽  
Mathematical Model ◽  
Stainless Steel ◽  
Charge Density ◽  
Energy Requirement ◽  
Phosphate Removal ◽  
Septic Tank ◽  
Metallic Ions ◽  
Treatment Unit ◽  
Consumable Electrodes

Abstract This paper presents bench scale experimental results on the electrolysis of raw domestic wastewater. Studies carried out with consumable electrodes are discussed. A mathematical model of a small electrolytic sewage treatment unit for individual household application is developed. The energy consumption and cost of such a device are discussed. Electrolysis can be described as a process in which chemical reactions are induced at each electro-liquid interface by applying an external electrical energy source to a system of electrodes immersed in a liquid. This paper deals only with electrolysis where a direct current power supply is used as the energy source. The process is governed by Faraday' s two laws on electrochemistry. The fundamental process parameter is the electrical charge density, measured as coulombs per litre (c/1) of wastewater treated. There are two basic types of electrolysis depending on the choice of anode material. When the anode is made of dissolvable metallic material such as iron, stainless steel and aluminum, the metal dissolves and goes into the sewage as metallic ions and forms hydrated metallic oxides which act as flocculating agents. The amount of metal dissolved is proportional to the quantity of electrical charges supplied to the system. Results from a series of batch experiments showed that electrolysis with consumable electrodes is capable of removing significant amounts of organic pollutants. Total organic carbon (TOC) removal was found to be a function of charge density. Phosphate removal efficiency of 90 percent or higher was achieved at a relatively low charge density of 240 coulombs per litre with either iron or stainless steel anodes. A mathematical model was derived in the conceptual design of a household electrolytic treatment unit. The model incorporates variables such as decomposition voltage of the electrodes and electrical conductivity of the wastewater as well as the physical configuration of the electrolytic cell. The energy requirement of such a unit can be calculated from the model. It is suggested in this paper that an electrolytic waste treatment unit could be an alternative to the septic tank and tile bed system in areas where the latter is not applicable due to poor soil and terrain conditions.

Development of the Biomaterials Technology for the Infection Resistance

2018 ◽  
Vol 24 (8) ◽  
pp. 886-895 ◽  
Author(s):  
Tengzhou Xu ◽  
Zhou Chen ◽  
Zhaofeng Chen ◽  
Yuxin Fan ◽  
Haifeng Mao
Keyword(s):  
Disease Spread ◽  
Metallic Ions ◽  
Comparative Performance ◽  
Tissue Interactions ◽  
Infection Resistance ◽  
Glass Base ◽  
Microbial Proliferation ◽  
The Common ◽  
Multicenter Clinical Trials ◽  
Technical Solutions

Infections caused by microbial proliferation are one of the common issues and serious threats to the medical care, and they usually result in disease spread. Therefore, it is a significant issue for developing the antiinfective biomaterials to control this problem, according to the specific clinical application. Meanwhile, all their properties, the best anti-infective performance, the safe biocompatibility and the appropriate tissue interactions must be conformed to each other. At present, technologies are developing novel biomaterials and surfaces endowed with anti-infective properties, relying either on bactericidal or anti-biofilm activities. This review focuses on thoroughly summarizing numerous kinds of antibacterial biomaterials, including the antibacterial matrix biomaterials, antibacterial coatings and films, nanostructured materials and antibacterial fibers. Among these strategies, the utilization of bio-glass base and graphene base antibacterial matrix, and their effects on the antibiosis mechanism were emphatically discussed. Simultaneously, the effects and mechanisms of nano-coated metallic ions are also mentioned. Overall, there is a wealth of technical solutions to contrast the establishment of an implant infection. The lack of well-structured prospective multicenter clinical trials hinders the achievement of conclusive data on the efficacy and comparative performance of antibacterial biomaterials.

Tailored functional materials as robust candidates to mitigate pesticides in aqueous matrices—a review

Chemosphere ◽  
2021 ◽  
pp. 131056
Author(s):  
Tahir Rasheed ◽  
Komal Rizwan ◽  
Muhammad Bilal ◽  
Farooq Sher ◽  
Hafiz.M.N. Iqbal
Keyword(s):  
Functional Materials ◽  
Aqueous Matrices

A General Route to Prepare One- and Three-Dimensional Carbon Nanotube/Metal Nanoparticle Composite Nanostructures

Langmuir ◽  
2007 ◽  
Vol 23 (11) ◽  
pp. 6352-6357 ◽  
Author(s):  
Xiaoge Hu ◽  
Tie Wang ◽  
Liang Wang ◽  
Shaojun Guo ◽  
Shaojun Dong
Keyword(s):  
Carbon Nanotube ◽  
Three Dimensional ◽  
Metal Nanoparticle ◽  
Composite Nanostructures

scholarly journals Effect of Salinity on UVA-Vis Light Driven Photo-Fenton Process at Acidic and Circumneutral pH

Water ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1315
Author(s):  
Iván Vallés ◽  
Lucas Santos-Juanes ◽  
Ana M. Amat ◽  
Javier Moreno-Andrés ◽  
Antonio Arques
Keyword(s):  
Hydroxyl Radicals ◽  
Acidic Medium ◽  
Emerging Pollutants ◽  
Clofibric Acid ◽  
Fenton Process ◽  
Simulated Sunlight ◽  
Scavenging Effect ◽  
Aqueous Matrices ◽  
Ph Dependent ◽  
Pollutants Removal

In the present work, the treatment of a mixture of six emerging pollutants (acetamiprid, acetaminophen, caffeine, amoxicillin, clofibric acid and carbamazepine) by means of photo-Fenton process has been studied, using simulated sunlight as an irradiation source. Removal of these pollutants has been investigated in three different aqueous matrices distinguished by the amount of chlorides (distilled water, 1 g L−1 of NaCl and 30 g L−1 of NaCl) at a pH of 2.8 and 5.0. Interestingly, the presence of 1 g L−1 was able to slightly accelerate the pollutants removal at pH = 5, although the reverse was true at pH = 2.8. This is attributed to the pH-dependent interference of chlorides on photo-Fenton process, that is more acute in an acidic medium. As a matter of fact, the fastest reaction was obtained at pH = 3.5, in agreement with literature results. Monitoring of hydrogen peroxide consumption and iron in solution indicates that interference with chlorides is due to changes in the interaction between iron and the peroxide, rather than a scavenging effect of chloride for hydroxyl radicals. Experiments were also carried out with real seawater and showed higher inhibition than in the NaCl experiments, probably due to the effect of different dissolved salts present in natural water.

Synthesis of geopolymers from fly and bottom ashes of a thermoelectrical power plant for metallic ions adsorption

2021 ◽  
Author(s):  
Enrique C. Peres ◽  
Matias Schadeck Netto ◽  
Evandro S. Mallmann ◽  
Luis F. O. Silva ◽  
Edson L. Foletto ◽  
...  
Keyword(s):  
Power Plant ◽  
Metallic Ions ◽  
Thermoelectrical Power

scholarly journals Tantalum doped SiO2-CaO-P2O5 based bioactive glasses: Investigation of in vitro bioactivity and antibacterial activities

2020 ◽  
Vol 6 (1) ◽  
pp. 10-22
Author(s):  
Zakaria Tabia ◽  
Sihame Akhtach ◽  
Khalil El Mabrouk ◽  
Meriame Bricha ◽  
Khalid Nouneh ◽  
...  
Keyword(s):  
Antibacterial Activities ◽  
Silica Matrix ◽  
Morphological Properties ◽  
Metallic Ions ◽  
X Ray Diffraction ◽  
Bioactive Glasses ◽  
E Coli ◽  
Fourier Transformed Infrared Spectroscopy ◽  
Electron Scanning Microscopy

AbstractMultifunctionality can be achieved for bioactive glasses by endowing them with multiple other properties along with bioactivity. One way to address this topic is by doping these glasses with therapeutic metallic ions. In this work, we put under investigation a series of bioactive glasses doped with tantalum. We aim to study the effect of tantalum, on the structure, bioactivity and antibacterial property of a ternary bioactive glass composition based on SiO2-CaO-P2O5. Fourier Transformed Infrared Spectroscopy (FTIR), X-Ray Diffraction (XRD) and Electron Scanning Microscopy (SEM) were used to assess the structural and morphological properties of these glasses and monitor their changes after in vitro acellular bioactivity test. Antibacterial activity was tested against gram positive and negative bacteria. Characterization results confirmed the presence of calcium carbonate crystallites along with the amorphous silica matrix. The assessment of bioactivity in SBF indicated that all compositions showed a fast bioactive response after only six hours of immersion period. However, analytical characterization revealed that tantalum introduced a slight latency in hydroxyapatite deposition at higher concentrations (0.8-1 %mol). Antibacterial test showed that tantalum ions had an inhibition effect on the growth of E. coli and S. aureus. This effect was more pronounced in compositions where mol% of tantalum is superior to 0.4%. These results proved that tantalum could be used, in intermediate proportions, as a promising multifunctional dopant element in bioactive glasses for bone regeneration applications.

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