scholarly journals Photodegradation of Polyphenols and Aromatic Amines in Olive Mill Effluents with Ni Doped C/TiO2

2015 ◽  
Vol 2015 ◽  
pp. 1-12 ◽  
Author(s):  
Delia Teresa Sponza ◽  
Rukiye Oztekin
Keyword(s):  
Aromatic Amines ◽  
Uv Light ◽  
Sunlight Irradiation ◽  
Operational Conditions ◽  
Ph Values ◽  
Olive Mill Wastewaters ◽  
C 50 ◽  
Optimized Conditions ◽  
Coated Carbon ◽  
Olive Mill

Magnetic nickel coated carbon based titanium dioxide [C/TiO2/Ni] nanocomposites were used for photodegradation of polyphenols and total aromatic amines (TAAs) metabolites from olive mill wastewaters (OMW) at different operational conditions such as different mass ratios of C, TiO2, and Ni (1%/2%/5%; 5%/1%/2%; and 2%/5%/1%), being at increasing photodegradation times (15, 30, 45, 60, 75, 120, and 180 min), photocatalyst concentrations (100, 250, 500, and 1000 mg L−1), pH values (3.5, 4.0, 7.0, and 10.0) and temperatures (15°C, 25°C, 50°C, and 80°C), and being under 300 W ultraviolet (UV) and 30 W sunlight irradiation. Under the optimized conditions, atpH=7.0, at 500 mg L−1C/TiO2/Ni nanocomposite, under 300 W UV light, after 60 min, at 25°C, the maximum CODdissolved, total phenol, and TAAs removals were 99%, 90%, and 96%, respectively. Photodegradation removals in the OMW under sunlight and being lower than those under UV light.

scholarly journals Removal of polyaromatics from textile industry using La /ZnO nanocomposite

2021 ◽  
Vol 4 (2) ◽  
Keyword(s):  
Textile Industry ◽  
Photocatalytic Oxidation ◽  
Uv Light ◽  
Diphenyl Ether ◽  
Mass Ratio ◽  
Operational Conditions ◽  
Treatment Processes ◽  
Doped Zno ◽  
Optimized Conditions ◽  
Industry Wastewater

The effects of the type and amount of loadings on the photocatalytic activity of Ln/ ZnO were studied and the results were compared with pure ZnO. The textile wastewaters (TW) could not be treated effectively with concentional treatment processes due to high polyphenols and colour content. In this study, La/ZnO nanocomposite was used for the photocatalytic oxidation of pollutant parameters [COD components (CODtotal, CODdissolved, CODinert), polyaromatic amines and color] from the textile effluent wastewaters (TW) at different operational conditions such as, at increasing photooxidation times (5 min, 15 min, 30 min, 60 min, 80 min and 100 min), at diferent La mass ratios (0.5wt% , 1wt%, 1.5wt%, 2wt%), at different La-ZnO photocatalyst concentrations (1, 5, 15, 30 and 45 mg/L), under 10, 30, 50 and 100 W ultraviolet (UV) irradiations, respectively. The maximum CODtotal, CODinert, total aromatic amines (TAAs) and color photooxidation yields were 99%, 92%, 98% and 99% respectively, under the optimized conditions, at 30 mg/L La/ZnO nanocomposite with a La mass ratio of 1.5 wt% under 50 W UV light, after 60 min photooxidation time, at 25oC. The photooxidation yields of 2-methoxy-5-methylaniline (MMA), 2,4-diaminoanisole(DAA); 4,40-diamino diphenyl ether (DDE), o-aminoazotoluene (OAAT), and 4-aminoazobenzol (AAB) polyaromatic amines were > 82%. The pollutants of textile industry wastewater were effectively degraded with lanthanum doped ZnO nanocomposite.

scholarly journals Bioconversion of p-Tyrosol into Hydroxytyrosol under Bench-Scale Fermentation

2018 ◽  
Vol 2018 ◽  
pp. 1-5 ◽  
Author(s):  
Zouhaier Bouallagui ◽  
Sami Sayadi
Keyword(s):  
Experimental Design ◽  
Dry Matter ◽  
Specific Productivity ◽  
Bench Scale ◽  
Olive Mill Wastewaters ◽  
Rich Solution ◽  
Olive Mill

Tyrosol hydroxylating Pseudomonas strain was previously isolated from olive mill wastewaters-irrigated soil. In the present work, experimental design was used to study the bioconversion of tyrosol in laboratory fermenters aiming at the recovery of the highest yields of hydroxytyrosol. The effects of biocatalyst loading and tyrosol concentration were studied. The bioconversion yield reached 86.9% (37.3 mM hydroxytyrosol) starting from a tyrosol concentration of 43 mM. Under these conditions, the specific productivity relative to the biocatalyst was 4.78 μM/min/g. The established model to predict bioconversion yield was validated in two bench-scale fermenters. At the downstream stage, the reaction product was recovered as a hydroxytyrosol rich solution after microfiltration and concentration under vacuum. Subsequent to this operation, hydroxytyrosol composition yielded 73.8% of the total dry matter.

Bioremediation of Olive-Mill Wastewaters By Composting

1995 ◽  
Vol 13 (6) ◽  
pp. 509-518 ◽  
Author(s):  
U. Tomati ◽  
E. Galli ◽  
L. Pasetti ◽  
E. Volterra
Keyword(s):  
Olive Mill Wastewaters ◽  
Olive Mill

scholarly journals Adsorption Efficiency of Pentafl Uorobenzene on Ionic Liquids-Based Silicas

2018 ◽  
Vol 20 (3) ◽  
pp. 47-52 ◽  
Author(s):  
Xiaofei Wang ◽  
Liangwen Lin ◽  
Jinfeng Xie ◽  
Xuemin Yan ◽  
Wei Xiao ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Solid Phase ◽  
Solution System ◽  
Ph Values ◽  
Several Variables ◽  
Effi Ciency ◽  
Relative Standard ◽  
Effects Of Ph ◽  
Chloride Salts ◽  
Optimized Conditions

Abstract The adsorption of pentafl uorobenzene on nine ionic liquid-based silicas was investigated using solid phase extraction. The effects of several variables such as the type of ionic liquid groups, adsorption time, temperatures and water ratio in the solution system were experimentally evaluated. The imidazole-chloride ionic liquid group based silica exhibited the highest adsorption effi ciency under the optimized conditions of 5 min adsorption at 30oC in water/methanol (30:70, vol%) solution. In addition, the effects of pH, as well as type and concentrations of chloride salts were investigated. At pH values other than neutral and high salt concentration, the adsorption effi ciency was reduced. Finally, the relative standard deviation of less than 5.8% over a 5-day period showed a high precision for the nine tested sorbents.

scholarly journals TIPS-Naphthalene for Efficient Visible-to-UV Photon Upconversion under Sunlight and Room Light

2020 ◽  
Author(s):  
Naoyuki Harada ◽  
Yoichi Sasaki ◽  
Masanori Hosoyamada ◽  
Nobuo Kimizuka ◽  
Nobuhiro Yanai
Keyword(s):  
High Performance ◽  
Uv Light ◽  
Light Sources ◽  
Solar Simulator ◽  
Visible Absorption ◽  
Excitation Light ◽  
Uv Emission ◽  
Threshold Excitation ◽  
Weak Light ◽  
Optimized Conditions

Until now, the efficiency of triplet-triplet annihilation-based photon upconversion (TTA-UC) from visible to ultraviolet (UV) light has been limited to ca. 10% due to the absence of high-performance acceptors (emitters). Here, we present the first example of visible-to-UV TTA-UC internal efficiency <i>η</i><sub>UC</sub> beyond 20% by developing a novel UV emitter, 1,4-bis((triisopropylsilyl)ethynyl)naphthalene (TIPS-Nph), and sensitizing its triplet by a donor Ir(C6)<sub>2</sub>(acac) with strong visible absorption and weak UV absorption. Under optimized conditions, 97% of the excitation light is absorbed, the threshold excitation intensity (<i>I</i><sub>th</sub> = 1.1 mW cm<sup>−2</sup>) is lower than the solar irradiance (1.4 mW cm<sup>−2</sup> for 445 ± 5 nm), and significantly, the highest external UC efficiency <i>η</i><sub>UC,ext</sub> of 17.4% for vis-to-UV TTA-UC is achieved. Upconverted UV emission can also be obtained with weak light sources such as an AM 1.5 solar simulator and room LEDs, paving the way for a variety of solar and indoor applications.

Olive-mill wastewaters: a promising substrate for microbial lipase production

2006 ◽  
Vol 97 (15) ◽  
pp. 1828-1833 ◽  
Author(s):  
Alessandro D’Annibale ◽  
Giovanni Giovannozzi Sermanni ◽  
Federico Federici ◽  
Maurizio Petruccioli
Keyword(s):  
Lipase Production ◽  
Microbial Lipase ◽  
Olive Mill Wastewaters ◽  
Olive Mill

Polyphenolic characterization of olive mill wastewaters, coming from Italian and Greek olive cultivars, after membrane technology

2014 ◽  
Vol 65 ◽  
pp. 301-310 ◽  
Author(s):  
Isabella D'Antuono ◽  
Vassiliki G. Kontogianni ◽  
Kali Kotsiou ◽  
Vito Linsalata ◽  
Antonio F. Logrieco ◽  
...  
Keyword(s):  
Membrane Technology ◽  
Olive Mill Wastewaters ◽  
Olive Cultivars ◽  
Olive Mill

Cleaning of olive mill wastewaters by visible light activated carbon doped titanium dioxide

RSC Advances ◽  
2015 ◽  
Vol 5 (104) ◽  
pp. 85586-85591 ◽  
Author(s):  
Francesca Cuomo ◽  
Francesco Venditti ◽  
Andrea Ceglie ◽  
Antonella De Leonardis ◽  
Vincenzo Macciola ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Activated Carbon ◽  
Visible Light ◽  
Olive Mill Wastewater ◽  
Total Phenols ◽  
Carbon Doped ◽  
Olive Mill Wastewaters ◽  
Doped Titanium Dioxide ◽  
Olive Mill

Visible light activated carbon doped titanium dioxide fully works in the removal of total phenols from olive mill wastewater.

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