Photodegradation Improvement of Low-Density Polyethylene Thin Film with gC3N4/5ZnO/TiO2 Photocatalysts

2017 ◽  
Vol 264 ◽  
pp. 236-239 ◽  
Author(s):  
Nelvi Sutanto ◽  
Srimala Sreekantan
Keyword(s):  
Degradation Rate ◽  
Composite Films ◽  
Critical Issue ◽  
Accelerated Weathering ◽  
Ldpe Film ◽  
Before And After ◽  
Sem Micrograph ◽  
Accelerated Weathering Test ◽  
Ldpe Composites ◽  
Surface Morphologies

LDPE waste disposal is a critical issue nowadays and huge pile of this polymer represents a threat to the environment. Herein, gC3N4/5ZnO/TiO2 photocatalysts (1 wt %) incorporated in LDPE film were investigated and compared with neat LDPE film. Tabletop scanning electron microscopy (SEM) micrograph showed the surface morphologies of neat and LDPE composite films before and after accelerated weathering. Experimental results on LDPE composite films after exposure to UV irradiation showed improvement in degradation rate (~0.274%/hour) in comparison to other study (0.225%/hour). Results of weight lost on LDPE composites after accelerated weathering test (~42.31%) also showed that the degradability increased with the decrease of thickness.

scholarly journals Application of Waterborne Acrylic and Solvent-Borne Polyester Coatings on Plasma-Treated Fir (Abies alba M.) Wood

Materials ◽  
2022 ◽  
Vol 15 (1) ◽  
pp. 370
Author(s):  
Hadi Gholamiyan ◽  
Behnam Gholampoor ◽  
Reza Hosseinpourpia
Keyword(s):  
Plasma Treatment ◽  
Treated Wood ◽  
Abies Alba ◽  
Untreated Wood ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Accelerated Weathering ◽  
Water Contact ◽  
Before And After ◽  
Carbon Dioxide Co2

This research investigates the effect of plasma treatment with air, nitrogen (N2), and carbon dioxide (CO2) gases on the performance of waterborne (acrylic) and solvent-borne (polyester) coated fir (Abies alba M.) wood samples. The properties of the plasma-coated samples were analyzed before and after exposure to accelerated weathering and compared with those of untreated and solely treated ones. According to pull-off testing, the coating adhesion of the wood samples was considerably improved by plasma treatment, and obvious differences were observed between different plasma gases. The effect was more pronounced after the weathering test. Similar results were obtained for the abrasion resistance of the samples. The water contact angle measurement illustrated more hydrophilic character in the solely plasma-treated wood in comparison with the untreated wood. The application of coatings, however, strongly improved its hydrophobic character. The performances of waterborne and solvent-borne coatings on plasma-treated wood were comparable, although slightly better values were obtained by the waterborne system. Our results exhibit the positive effect of plasma treatment on coating performances and the increased weather resistance of the waterborne and solvent-borne coating systems on plasma-treated wood.

Effects of Surface Treatment on Photocattalytic Activity of TiO2 Coatings Using Microarc-Oxidation

2012 ◽  
Vol 454 ◽  
pp. 26-29
Author(s):  
Hui Dong Su ◽  
Zhong Hua Shi
Keyword(s):  
Acetic Acid ◽  
Surface Treatment ◽  
Photocatalytic Degradation ◽  
Titanium Oxide ◽  
Degradation Rate ◽  
Microarc Oxidation ◽  
Oxide Coatings ◽  
Photocatalytic Ability ◽  
Before And After ◽  
Micro Arc Oxidation

Titanium oxide coatings （Ti/TiO2）were formed on the titanium net surface by micro-arc oxidation(MAO) in Na3PO4 solution using an AC power supply. Then the titanium oxide coatings were treated by acetic acid or La(NO3)3 aqueous solution to improve its activity. The structures and photocatalytic ability of titanium oxide coatings before and after surface treatment were characterized and evaluated by XRD, SEM, EDX. It was found that the titanium oxide film is mainly made of titanium and anatase .When acetic acid aqueous concentration is 0.1mol•L-1 and soak time is 6 hour ,the Ti/TiO2 films photocatalytic degradation rate increased from 15% to 33.6%. When La(NO3)3 aqueous concentration is 0.1mol•L-1 and soak time is 12 hour, the Ti/TiO2 films photocatalytic degradation rate increased from 15% to 34.8%.

UNRAVELING MARKOV PROCESSES IN MOVEMENT PATTERNS OF INDICATOR SPECIES IN RESPONSE TO CHEMICAL STRESSORS

2011 ◽  
Vol 25 (12n13) ◽  
pp. 1143-1149 ◽  
Author(s):  
TUYEN VAN NGUYEN ◽  
YUEDAN LIU ◽  
IL-HYO JUNG ◽  
TAE-SOO CHON ◽  
SANG-HEE LEE
Keyword(s):  
Markov Processes ◽  
Transition Probability ◽  
Movement Patterns ◽  
Critical Issue ◽  
Transition Probability Matrix ◽  
Behavioral Changes ◽  
Environmental Stressors ◽  
Biological Responses ◽  
Low Concentrations ◽  
Before And After

Revealing biological responses of organisms in responding to environmental stressors is the critical issue in contemporary ecological sciences. Markov processes in behavioral data were unraveled by utilizing the hidden Markov model (HMM). Individual organisms of daphnia (Daphnia magna) and zebrafish (Danio rerio) were exposed to diazinon at low concentrations. The transition probability matrix (TPM) and the emission probability matrix (EPM) were accordingly estimated by training with the HMM and were verified before and after the treatments with 10-6 tolerance in 103 iterations. Structured property in behavioral changes was accordingly revealed to characterize dynamic processes in movement patterns. Parameters and sequences produced through the HMM training could be a suitable means of monitoring toxic chemicals in environment.

Potassium Extraction from Biotite by Penicillium and Aspergillus

2013 ◽  
Vol 825 ◽  
pp. 423-426 ◽  
Author(s):  
Miao Song ◽  
Israel Pedruzzi ◽  
Ping Li ◽  
Jin Feng Liu ◽  
Jian Guo Yu
Keyword(s):  
High Performance ◽  
Weight Fraction ◽  
Fungal Species ◽  
Penicillium Oxalicum ◽  
Agricultural Sustainable Development ◽  
Before And After ◽  
Dialysis Bag ◽  
Surface Morphologies ◽  
Leaching Medium ◽  
K Release

Owing to lack of soluble potassium resource in some countries, it will be the competitive alternative to obtain potassium from insoluble K-bearing minerals (e.g. K-feldspar, biotite) in order to satisfy the requirements of potassium fertilizers for the agricultural sustainable development. In this work, seven fungal species including Penicillium oxalicum, P. ochrochloron, P. simplicissimum, P. spinulosum, Aspergillus niger, A. fumigatus, and A. oryzae were investigated for potassium extraction from biotite (9.64% K2O, weight fraction). Experiments were carried out in a shaker (30 °C, 180 rpm) with biotite directly dispersed in the leaching medium or enclosed in a dialysis bag. The concentrations of potassium, silicon and aluminum in the bioleaching solution were measured by Inductive Coupled Plasma (ICP), and K release amounts of biotite by seven fungal species were compared. It was found that all the strains had the abilities to enhance the dissolution of biotite, and P. oxalicum showed the highest K release amount among seven tested strains. Furthermore, the metabolites of fungi in the bioleaching process were analyzed by high performance liquid chromatography (HPLC), and the surface morphologies of biotite before and after bioleaching were characterized by Scanning Electron Microscope (SEM). The mechanism of microbial release of potassium from biotite by Penicillium andAspergillus was discussed.

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