Effect of Metal Ions (Trivalent Chromium Ion and Copper Ion) on Light-Degradation of Silk Fabric

2011 ◽  
Vol 175-176 ◽  
pp. 209-213
Author(s):  
Hao Wang ◽  
Chen Huang
Keyword(s):  
Metal Ions ◽  
Exposure Time ◽  
Metal Ion ◽  
Breaking Strength ◽  
Copper Ions ◽  
Light Exposure ◽  
Sulfate Solution ◽  
Silk Fabric ◽  
Light Conditions ◽  
Copper Sulfate Solution

It was studied that metal ions affected light-degradation of silk fabric in this paper. The contrast of the weight and the tensile properties of silk fabric treated without or with different concentrations of metal ions (copper sulfate solution and chromium sulfate solution) by different time of light conditions were carried out. The results showed that after the treatment of silk with metal ions solution, the weight gain of the silk fabric increased with increasing the concentration of metal ions solution. There were different changes in the breaking strength of silk fabric treated with different metal ions when subjected to light exposure. In the same light conditions, comparing with the fabric without treatment, the breaking strength of the fabric with copper (ii) ions treatment increased while the breaking strength of the fabric with chromium (iii) ions treatment obviously decreased. Besides, fabric samples with copper ions treatment slowed down the decreasing rate of the breaking strength and fabric samples with chromium ions treatment accelerated the decreasing rate with increasing light exposure time. The results indicated copper (ii) ions had an inhibitory effect on light-degradation of silk fabric, and chromium (iii) ions enhanced light-degradation of silk fabric. Meanwhile, their respective function for fabric increased along with the increment of adsorption values of metal ions on silk fabrics. When being treated with the same concentration of metal ion solution, weight loss of the silk fabric improved and the breaking strength of the fabric decreased with increasing light exposure time, and the two had linear relationship.

scholarly journals Excitation-Energy Transfer Paths from Tryptophans to Coordinated Copper Ions in Engineered Azurins: a Source of Observables for Monitoring Protein Structural Changes

2016 ◽  
Vol 230 (9) ◽  
Author(s):  
Giulia Di Rocco ◽  
Fabrizio Bernini ◽  
Marco Borsari ◽  
Ilaria Martinelli ◽  
Carlo Augusto Bortolotti ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Excitation Energy ◽  
Metal Ions ◽  
Recombinant Proteins ◽  
Metal Ion ◽  
Structural Changes ◽  
Copper Ions ◽  
Excitation Energy Transfer ◽  
Ion Binding ◽  
Metal Ion Binding

AbstractThe intrinsic fluorescence of recombinant proteins offers a powerful tool to detect and characterize structural changes induced by chemical or biological stimuli. We show that metal-ion binding to a hexahistidine tail can significantly broaden the range of such structurally sensitive fluorescence observables. Bipositive metal-ions as Cu

scholarly journals Highly Selective Copper Ion Imprinted Clay/Polymer Nanocomposites Prepared by Visible Light Initiated Radical Photopolymerization

Polymers ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 286 ◽  
Author(s):  
Radhia Msaadi ◽  
Gorkem Yilmaz ◽  
Andrit Allushi ◽  
Sena Hamadi ◽  
Salah Ammar ◽  
...  
Keyword(s):  
Visible Light ◽  
Metal Ions ◽  
Adsorption Capacity ◽  
Polymer Nanocomposites ◽  
Metal Ion ◽  
Copper Ions ◽  
Maximum Adsorption Capacity ◽  
Imprinted Polymer ◽  
Ion Imprinted ◽  
Ion Imprinting

There is an urgent demand worldwide for the development of highly selective adsorbents and sensors of heavy metal ions and other organic pollutants. Within these environmental and public health frameworks, we are combining the salient features of clays and chelatant polymers to design selective metal ion adsorbents. Towards this end, the ion imprinting approach has been used to develop a novel nanohybrid material for the selective separation of Cu2+ ions in an aqueous solution. The Cu2+-imprinted polymer/montmorillonite (IIP/Mt) and non-imprinted polymer/montmorillonite (NIP/Mt) nanocomposites were prepared by a radical photopolymerization process in visible light. The ion imprinting step was indeed important as the recognition of copper ions by IIP/Mt was significantly superior to that of NIP/Mt, i.e., the reference nanocomposite synthesized in the same way but in the absence of Cu2+ ions. The adsorption process as batch study was investigated under the experimental condition affecting same parameters such as contact time, concentration of metal ions, and pH. The adsorption capacity of Cu2+ ions is maximized at pH 5. Removal of Cu2+ ion achieved equilibrium within 15 min; the results obtained were found to be fitted by the pseudo-second-order kinetics model. The equilibrium process was well described by the Langmuir isothermal model and the maximum adsorption capacity was found to be 23.6 mg/g. This is the first report on the design of imprinted polymer nanocomposites using Type II radical initiators under visible light in the presence of clay intercalated with hydrogen donor diazonium. The method is original, simple and efficient; it opens up new horizons in the general domain of clay/polymer nanocomposites.

Enhanced laccase activity of white rot fungi induced by different metal ions under submerged fermentation

BioResources ◽  
2020 ◽  
Vol 15 (4) ◽  
pp. 8369-8383
Author(s):  
Qi An ◽  
Mei-Ling Han ◽  
Lu-Sen Bian ◽  
Zhi-Chao Han ◽  
Ning Han ◽  
...  
Keyword(s):  
Metal Ions ◽  
Metal Ion ◽  
Laccase Activity ◽  
Copper Ions ◽  
Copper Ion ◽  
White Rot Fungi ◽  
White Rot ◽  
Ferrous Ions ◽  
Mixed Metal ◽  
Manganese Ion

Submerged fermentation with single or mixed metal ions as inducers was used for laccase production from white rot fungi. Mixed metal ions were used for the first time as inducers for Pleurotus ostreatus and Flammulina velutipes to enhance laccase activity. The maximum laccase activity from P. ostreatus in basal media, metal ion media 1 containing copper ion, metal ion media 2 containing manganese ion, metal ion media 3 containing manganese and copper ions, metal ion media 4 containing ferrous ion, metal ion media 5 containing manganese and ferrous ions, metal ion media 6 containing ferrous and copper ions, and metal ion media 7 containing manganese, copper and ferrous ions were, respectively, approximately 21.5-fold, 4.7-fold, 14.9-fold, 16.9-fold, 4.0-fold, 11.0-fold, 12.7-fold, and 24.8-fold higher than that from F. velutipes. The combination of copper and manganese ions as inducers was superior to that of a single copper ion or manganese ion. The maximum laccase activity of P. ostreatus rose in media containing manganese and copper ions. The single copper ion as the inducer for enhancing laccase activity was more suitable for F. velutipes. These findings are helpful in selecting the appropriate single metal ion or mixed metal ions to enhance laccase activity.

Preliminary Investigation of Removing Copper Contamination From Water Using Algae

2020 ◽  
Author(s):  
Ketan Thakare ◽  
Laura Jerpseth ◽  
Hongmin Qin ◽  
Zhijian Pei
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Chlamydomonas Reinhardtii ◽  
Exposure Time ◽  
Environmental Protection Agency ◽  
Copper Concentration ◽  
Copper Ions ◽  
Water Solution ◽  
Heavy Metal Poisoning ◽  
Metal Poisoning

Abstract Drinking water contaminated with metal ions can cause negative health effects in humans. Acute heavy metal poisoning can cause such symptoms as vomiting and fainting, while chronic heavy metal poisoning can lead to organ failure and death. It has previously been shown that concentration of metal ions in water solution was decreased by algae. This paper reports a study to examine the ability of two Chlamydomonas reinhardtii algae strains to remove copper ions from water solution. Chlamydomonas reinhardtii was chosen for this study because it is easy to culture, and can be used to generate strains with a higher efficiency to remove metals. In this study, the three-factor, two-level full factorial design was used to conduct experiments. Three factors were algae strain, initial copper concentration, and exposure time. Two levels of the algae strain are: cc125 — the Chlamydomonas reinhardtii strain found commonly in the wild, and AGG1 — an experimentally modified Chlamydomonas reinhardtii strain. Two levels of initial copper concentration and exposure time were 1.5 and 3 ppm, and 2.5 and 5 hours, respectively. Copper concentration in the water solution after experiments was measured using inductively coupled plasma-mass spectrometry, or ICP-MS. Statistical analysis showed that algae strain was the only factor that significantly affected percentage decrease in copper concentration, at the significance level of 0.05. The cc125 strain decreased copper concentration more efficiently than the AGG1 strain. The cc125 strain decreased copper concentration by 97% for the water solution with an initial copper concentration of 1.5 ppm, and by 90% for the solution with an initial copper concentration of 3 ppm. Copper concentrations of all solutions treated by the cc125 strain were below the Environmental Protection Agency pollution threshold level of 1.3 ppm.

scholarly journals Anthracene coupled adenine for the selective sensing of copper ions

2010 ◽  
Vol 6 ◽  
Author(s):  
Kumaresh Ghosh ◽  
Tanushree Sen
Keyword(s):  
Metal Ions ◽  
Metal Ion ◽  
Copper Ions ◽  
The Other ◽  
Ion Recognition ◽  
Experimental Conditions

Anthracene-based adenines 1 and 2 have been designed and synthesized, and their metal ion recognition properties have been established fluorometrically. Both molecules exhibit Cu2+ induced ON-OFF type signaling patterns over the other representative metal ions studied. Compound 1 exhibits 97% quenching of emission in the presence of Cu2+ whilst derivative 2 shows 81% quenching under similar experimental conditions.

scholarly journals Impurities Effect on Carbonate Reactive Crystallization for the Wastewater

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Y. Shimizu ◽  
I. Hirasawa
Keyword(s):  
Metal Ions ◽  
Fine Particles ◽  
Copper Ions ◽  
Copper Ion ◽  
Sulfate Solution ◽  
Inhibitory Effect ◽  
Component Ratio ◽  
Metal Sulfate ◽  
Metals Removal ◽  
Reactive Crystallization

Reactive crystallization designed to separate nickel or copper ion from effluents has been advanced for applying to actual industrial wastewater containing impurities. In the primary reaction of this method, metal sulfate solution reacts with sodium carbonate solution in a semibatch crystallizer. In the present study, during the process of nickel or copper ions incorporation, inhibitory effect on seed growth of impurities, like cobalt, manganese, zinc, and borate and phosphate ions, was investigated. Through the 8-hour reactive crystallization, obtained particles’ characters and metals removal efficient were examined. Considering analyses data on metal component ratio in produced crystals, metal ions initial uptake rate was found to be different by the kind of seeds and impurities. And the centrifugation was performed against obtained crystals aimed for examining target metal purity improvement. The results indicated that copper components can incorporate and remove other metal ions easily. In addition, when the anions are used as impurities, depending on the kind of anions, the effect of damaging the surface of seeds or producing many fine particles has been confirmed.

scholarly journals Simultaneous Determination of Metal Ions in Zinc Sulfate Solution Using UV–Vis Spectrometry and SPSE-XGBoost Method

Sensors ◽  
2020 ◽  
Vol 20 (17) ◽  
pp. 4936 ◽  
Author(s):  
Fei Cheng ◽  
Chunhua Yang ◽  
Can Zhou ◽  
Lijuan Lan ◽  
Hongqiu Zhu ◽  
...  
Keyword(s):  
Metal Ions ◽  
Real Time ◽  
Metal Ion ◽  
Sulfate Solution ◽  
Gradient Boosting ◽  
Feature Subset ◽  
Full Spectrum ◽  
Ion Concentrations ◽  
Extreme Gradient Boosting

Excessive discharge of heavy metal ions will aggravate environment pollution and threaten human health. Thus, it is of significance to real-time detect metal ions and control discharge in the metallurgical wastewater. We developed an accurate and rapid approach based on the singular perturbation spectrum estimator and extreme gradient boosting (SPSE-XGBoost) algorithms to simultaneously determine multi-metal ion concentrations by UV–vis spectrometry. In the approach, the spectral data is expanded by multi-order derivative preprocessing, and then, the sensitive feature bands in each spectrum are extracted by feature importance (VI score) ranking. Subsequently, the SPSE-XGBoost model are trained to combine multi-derivative features and to predict ion concentrations. The experimental results indicate that the developed “Expand-Extract-Combine” strategy can not only overcome problems of background noise and spectral overlapping but also mine the deeper spectrum information by integrating important features. Moreover, the SPSE-XGBoost strategy utilizes the selected feature subset instead of the full-spectrum for calculation, which effectively improves the computing speed. The comparisons of different data processing methods are conducted. It outcomes that the proposed strategy outperforms other routine methods and can profoundly determine the concentrations of zinc, copper, cobalt, and nickel with the lowest RMSEP. Therefore, our developed approach can be implemented as a promising mean for real-time and on-line determination of multi-metal ion concentrations in zinc hydrometallurgy.

scholarly journals Comparison between Performance of Okra Waste and Wheat Bran for Removing some Heavy Metals from Wastewater

2018 ◽  
Vol 21 (1) ◽  
pp. 36
Author(s):  
Karim Khalifa Esgair
Keyword(s):  
Metal Ions ◽  
Wheat Bran ◽  
Metal Ion ◽  
Copper Ions ◽  
Batch Process ◽  
Agitation Speed ◽  
Ion Concentration ◽  
Initial Ph ◽  
Agitation Time ◽  
Maximum Removal

In the present work, the  agricultural wastes which are wheat bran and raw okra waste used  as adsorbent material for adsorption  of cadmium and copper ions from wastewater .The effect of adsorption variable which include initial  pH of solution , agitation speed, agitation time, initial concentration of cadmium and copper ions, and amount of adsorbent material were investigated  in a batch process in order to obtain the  maximum  ions removal from wastewater .The results obtained from experimental investigation show that the percentage removal   of metal ions  increases with increasing pH and agitation speed until a maximize value after that it decreased with increasing pH and agitation speed. Also increases with increasing amount of adsorbent material and agitation time until a maximize value then reach a constant value   approximately , and decreasing with increasing  metal ions concentration .The maximum removal percent of cadmium and copper ions were  85.8%  and 52.7 % respectively which obtained at pH equal 5.0, agitation speed 150 revolution per minute, agitation  time 105 minute , metal ion concentration 40mg /L ,and adsorbent amount 1.5gm when using wheat bran as adsorbent material ,while obtained  the maximum removal percent of cadmium and copper ions were  81.7%  and 47.8 % which obtained at pH equal 6.0, and pH equal 5.0 respectively , agitation speed 150 revolution per minute, agitation  time 90 minute ,metal ion concentration 40 mg /L ,and adsorbent amount 1.5gm when using okra waste as adsorbent material. From above result the wheat bran and okra waste was a best adsorbent material for removal cadmium and copper ions from wastewater but wheat bran slightly more effective than okra waste.  

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