Extended Abstract Environment contamination by heavy metals cause serious health and ecological problems in many parts of the world [1]. Therefore, their accurate analytical determination is of great importance. Chemical modification of electrodes is an effective way to improve sensitivity and selectivity of electrochemical sensors used for metal ions determination. Carbon nanotubes (CNTs) due to their high electrical conductivity can introduce strong electrocatalytic activity to electrochemical devices, and thus, have been successfully applied in the fabrication of electrochemical sensors for various applications [2]. Ion-imprinted polymers (IIPs) are macromolecules showing high selectivity toward target ion related to a memory effect resulting from the process of their preparation. Their other advantages are chemical stability, low cost, and easiness of preparation [3]. Carbon nanotubes functionalized with ion-imprinted polymers are promising materials for electrodes modification. The aim of the study is formation of new selective materials based on carbon nanotubes and ion-imprinted polymers for modification of electrodes. The first stage of the project involved covalent functionalization of carbon nanotubes with dithiocarbonates, which are chain transfer agents in RAFT (reversible addition-fragmentation chain transfer) polymerization. Functionalization of CNTs with dithiocarbonates enables polymerization conducted directly from nanotube’s surface. CNT-IIP hybrids were synthesized by polymerizing a mixture of dithiocarbonate-modified CNTs, template ions (Pd), functional monomers and a crosslinker. Polymerizations were performed using commercially available monomers (e.g. acrylonitrile, acrylic acid) as well as synthesized ones i.e. carbamohydrazonothioate or thiourea-based molecules having high affinity to metal ions. In this way several CNT-IIP nanohybrids were obtained. The specific cavities complementary to the size and shape of the template ions were formed after their removal from the polymer network. The obtained materials were deposited on gold electrodes by solvent evaporation. Raman spectroscopy, Fourier transform infrared spectroscopy, thermogravimetric analysis, and scanning and transmission electron microscopy were employed to confirm modifications and study chemical composition of the obtained materials. Electrochemical properties were analysed by cyclic voltammetry and electrochemical impedance spectroscopy.
{"title":"Carbon Nanotube-Based Ion Imprinted Polymers: Formation, Characterization and Electrochemical Properties","authors":"K. Markiewicz, A. Wilczewska","doi":"10.11159/ICNFA19.139","DOIUrl":"https://doi.org/10.11159/ICNFA19.139","url":null,"abstract":"Extended Abstract Environment contamination by heavy metals cause serious health and ecological problems in many parts of the world [1]. Therefore, their accurate analytical determination is of great importance. Chemical modification of electrodes is an effective way to improve sensitivity and selectivity of electrochemical sensors used for metal ions determination. Carbon nanotubes (CNTs) due to their high electrical conductivity can introduce strong electrocatalytic activity to electrochemical devices, and thus, have been successfully applied in the fabrication of electrochemical sensors for various applications [2]. Ion-imprinted polymers (IIPs) are macromolecules showing high selectivity toward target ion related to a memory effect resulting from the process of their preparation. Their other advantages are chemical stability, low cost, and easiness of preparation [3]. Carbon nanotubes functionalized with ion-imprinted polymers are promising materials for electrodes modification. The aim of the study is formation of new selective materials based on carbon nanotubes and ion-imprinted polymers for modification of electrodes. The first stage of the project involved covalent functionalization of carbon nanotubes with dithiocarbonates, which are chain transfer agents in RAFT (reversible addition-fragmentation chain transfer) polymerization. Functionalization of CNTs with dithiocarbonates enables polymerization conducted directly from nanotube’s surface. CNT-IIP hybrids were synthesized by polymerizing a mixture of dithiocarbonate-modified CNTs, template ions (Pd), functional monomers and a crosslinker. Polymerizations were performed using commercially available monomers (e.g. acrylonitrile, acrylic acid) as well as synthesized ones i.e. carbamohydrazonothioate or thiourea-based molecules having high affinity to metal ions. In this way several CNT-IIP nanohybrids were obtained. The specific cavities complementary to the size and shape of the template ions were formed after their removal from the polymer network. The obtained materials were deposited on gold electrodes by solvent evaporation. Raman spectroscopy, Fourier transform infrared spectroscopy, thermogravimetric analysis, and scanning and transmission electron microscopy were employed to confirm modifications and study chemical composition of the obtained materials. Electrochemical properties were analysed by cyclic voltammetry and electrochemical impedance spectroscopy.","PeriodicalId":265434,"journal":{"name":"Proceedings of the 5th World Congress on New Technologies","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121292912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Nanotechnologies for Advanced Drug Delivery Systems","authors":"Michael Chen","doi":"10.11159/ICBB19.02","DOIUrl":"https://doi.org/10.11159/ICBB19.02","url":null,"abstract":"","PeriodicalId":265434,"journal":{"name":"Proceedings of the 5th World Congress on New Technologies","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131230775","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Extended Abstract High-tech critical metals were defined as those metals essential for high-tech industry but with low availability due to uneven geographical distribution, thus resulting a high price volatility [1 3]. The challenge of the future is to assure a stable supply of high-tech metals by innovative approaches such as biomining. Potential alternative sources and possible new biotechnologies are the subject of current research [4, 5]. The main objective of our work was to isolate microbial strains with potential on biosolubilization and bioaccumulation of high-tech critical metals. Experimental: The samples of mining tailings containing high tech critical metals were collected from a depth of approximately maximum 100 cm below surface. They were placed in clean sterile bags, labelled accordingly and stored at 4 oC until further analysis. In order to be used for the microbiological studies, the samples were grounded to obtain a coarse powder. The chemicals used was metal(loid)s (Mo, W) and cultivation media for isolation and maintenance of the strains isolated (nutrient agar, nutrient broth, DSMZ 670 modified). Two different strategies were employed for the isolation of bacteria from the mine wastes samples. Following the isolation and purification, the strains were evaluated for the ability to grow on minimal agar in the presence of various concentration of Mo and W. The isolated strains were tested for their metal tolerance using the agar diffusion method. The agar was supplemented with successively higher concentrations (0, 5, 25, 50 mg /L) of the critical metals mentioned before. The growth of bacteria on the plates containing culture media with no metals was considered as control. Results: Bacterial strains capable of biosolubilizing and bioaccumulating Mo and W were isolated by applying two different strategies. The strains were isolated from the plates incubated at ambient temperature (23 24 ° C). The bacterial colonies were studied with respect to size, colour, opacity, and form. All bacterial strains proved to be Gram-negative.
{"title":"Microbial Strains for High-Tech Critical Metals Recovery","authors":"A. Buțu, S. Rodino, M. Buțu","doi":"10.11159/ICBB19.132","DOIUrl":"https://doi.org/10.11159/ICBB19.132","url":null,"abstract":"Extended Abstract High-tech critical metals were defined as those metals essential for high-tech industry but with low availability due to uneven geographical distribution, thus resulting a high price volatility [1 3]. The challenge of the future is to assure a stable supply of high-tech metals by innovative approaches such as biomining. Potential alternative sources and possible new biotechnologies are the subject of current research [4, 5]. The main objective of our work was to isolate microbial strains with potential on biosolubilization and bioaccumulation of high-tech critical metals. Experimental: The samples of mining tailings containing high tech critical metals were collected from a depth of approximately maximum 100 cm below surface. They were placed in clean sterile bags, labelled accordingly and stored at 4 oC until further analysis. In order to be used for the microbiological studies, the samples were grounded to obtain a coarse powder. The chemicals used was metal(loid)s (Mo, W) and cultivation media for isolation and maintenance of the strains isolated (nutrient agar, nutrient broth, DSMZ 670 modified). Two different strategies were employed for the isolation of bacteria from the mine wastes samples. Following the isolation and purification, the strains were evaluated for the ability to grow on minimal agar in the presence of various concentration of Mo and W. The isolated strains were tested for their metal tolerance using the agar diffusion method. The agar was supplemented with successively higher concentrations (0, 5, 25, 50 mg /L) of the critical metals mentioned before. The growth of bacteria on the plates containing culture media with no metals was considered as control. Results: Bacterial strains capable of biosolubilizing and bioaccumulating Mo and W were isolated by applying two different strategies. The strains were isolated from the plates incubated at ambient temperature (23 24 ° C). The bacterial colonies were studied with respect to size, colour, opacity, and form. All bacterial strains proved to be Gram-negative.","PeriodicalId":265434,"journal":{"name":"Proceedings of the 5th World Congress on New Technologies","volume":"95 33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129208624","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Metakaolin-Based Geopolymers for Removal of Ammonium from Municipal Wastewater","authors":"T. Samarina, E. Takaluoma","doi":"10.11159/ICEPR19.195","DOIUrl":"https://doi.org/10.11159/ICEPR19.195","url":null,"abstract":"","PeriodicalId":265434,"journal":{"name":"Proceedings of the 5th World Congress on New Technologies","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125889257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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