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Simultaneous photooxidation and photoreduction of phenol and Cr(VI) ions using titania modified with nanosilica 纳米二氧化硅改性二氧化钛对苯酚和Cr(VI)离子的同时光氧化和光还原
IF 1 4区 工程技术
Polish Journal of Chemical Technology Pub Date : 2022-12-01 DOI: 10.2478/pjct-2022-0025
Daria Kądziołka, J. Grzechulska-Damszel, B. Schmidt
{"title":"Simultaneous photooxidation and photoreduction of phenol and Cr(VI) ions using titania modified with nanosilica","authors":"Daria Kądziołka, J. Grzechulska-Damszel, B. Schmidt","doi":"10.2478/pjct-2022-0025","DOIUrl":"https://doi.org/10.2478/pjct-2022-0025","url":null,"abstract":"Abstract The photocatalytic process of phenol oxidation and Cr(VI) reduction in the presence of nano-silica modified titania was carried out. The activity of composites was tested using two different light sources. The photocatalysts with 10% of nanosilica showed the highest activity. The calcination temperature (200–800 oC) significantly determined the sensitivity of the obtained materials to the light source used. Photocatalysts alternately adsorbed and desorbed Cr(VI) ions from the reaction mixture during irradiation. In the one-component mixture, complete oxidation of phenol was observed using material calcined at 650 oC, after 3 h of UV-VIS irradiation. In the reaction mixture of Cr(VI) and phenol, the highest activity was demonstrated by photocatalyst calcined at 300 oC. The concentration of phenol decreased in proportion to the decrease of chromium ions. The obtained titania-silica composites showed oxidizing properties towards phenol and reductive properties toward Cr(VI) ions.","PeriodicalId":20324,"journal":{"name":"Polish Journal of Chemical Technology","volume":"24 1","pages":"23 - 29"},"PeriodicalIF":1.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46163221","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Adsorption of CO2 by surface modified coal-based activated carbons: kinetic and thermodynamic analysis 表面改性煤基活性炭吸附CO2的动力学和热力学分析
IF 1 4区 工程技术
Polish Journal of Chemical Technology Pub Date : 2022-09-01 DOI: 10.2478/pjct-2022-0018
Liu Xinzhe, Zhang Mingyang, C. Juan, H. Zhengyu, Xian Shuaifei, Tang Mingxuan, Zhang Chenchen
{"title":"Adsorption of CO2 by surface modified coal-based activated carbons: kinetic and thermodynamic analysis","authors":"Liu Xinzhe, Zhang Mingyang, C. Juan, H. Zhengyu, Xian Shuaifei, Tang Mingxuan, Zhang Chenchen","doi":"10.2478/pjct-2022-0018","DOIUrl":"https://doi.org/10.2478/pjct-2022-0018","url":null,"abstract":"Abstract The effects of different surface modifiers on the CO2 adsorption capacity of coal-based activated carbons were studied, and the diffusion behavior, adsorption kinetics and thermodynamic parameters of CO2 in activated carbons were analyzed. The results show that compared with ethylene glycol, 1,2-propylenediamine and zinc chloride, potassium hydroxide and sodium hydroxide can greatly improve CO2 adsorption capacity. The adsorption rate is faster, and the adsorption capacity is larger, with the maximum CO2 adsorption capacity being 33.54 mL/g. Fick's law can well describe the diffusion behavior of CO2 in activated carbon. The addition of a surface modifier can increase the diffusion coefficient. The diffusion of CO2 in activated carbon falls into the category of crystal diffusion. The adsorption kinetics of CO2 before and after surface modification follow the Bangham equation. During the adsorption process, δ H < 0, δ G < 0, δ S < 0. Surface modification can reduce adsorption heat and promote adsorption, and the adsorption process is dominated by physisorption.","PeriodicalId":20324,"journal":{"name":"Polish Journal of Chemical Technology","volume":"24 1","pages":"19 - 28"},"PeriodicalIF":1.0,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48922467","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Determination of twist drill bits wear: the effect of the composition and structure of the steels 麻花钻头磨损的测定：钢的成分和结构的影响
IF 1 4区 工程技术
Polish Journal of Chemical Technology Pub Date : 2022-09-01 DOI: 10.2478/pjct-2022-0016
K. Prałat, A. Krupińska, M. Ochowiak, S. Włodarczak, M. Matuszak, Justyna Ciemnicka, A. Koper, Karolina Wójcicka
{"title":"Determination of twist drill bits wear: the effect of the composition and structure of the steels","authors":"K. Prałat, A. Krupińska, M. Ochowiak, S. Włodarczak, M. Matuszak, Justyna Ciemnicka, A. Koper, Karolina Wójcicka","doi":"10.2478/pjct-2022-0016","DOIUrl":"https://doi.org/10.2478/pjct-2022-0016","url":null,"abstract":"Abstract The aim of the study was to relate the influence of the chemical composition, structure, and basic properties as hardness of the tested drill bits on resistance to their wear. The chemical composition of the drill bit was investigated using the electric excitation emission spectrometry method and EDS microanalysis. Metallographic specimens were prepared and observed to determine the structure of each tool. Hardness tests were carried out on the shank and the working part of the tools. Material wear tests were carried out on the basis of measuring the wear of the drill bit flank. It has been shown that the appropriate selection of the chemical composition and heat treatment has a significant impact on the wear resistance of cutting tools, which directly translates into their quality.","PeriodicalId":20324,"journal":{"name":"Polish Journal of Chemical Technology","volume":"24 1","pages":"8 - 13"},"PeriodicalIF":1.0,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41615516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Application of foam separation in production of β-glucanase in Pichia 泡沫分离技术在毕赤酵母生产β-葡聚糖酶中的应用
IF 1 4区 工程技术
Polish Journal of Chemical Technology Pub Date : 2022-09-01 DOI: 10.2478/pjct-2022-0015
Qin Yuhang, C. Yuqing, Peng Yajuan, Shao Wenyao
{"title":"Application of foam separation in production of β-glucanase in Pichia","authors":"Qin Yuhang, C. Yuqing, Peng Yajuan, Shao Wenyao","doi":"10.2478/pjct-2022-0015","DOIUrl":"https://doi.org/10.2478/pjct-2022-0015","url":null,"abstract":"Abstract β-glucanase is widely used in many fields and has great economic value and development space, but it faces the difficulties of separation and nutrient destruction in the process of industrial production. Foam separation is a simple, mild and efficient adsorption separation technique that enables efficient separation and extraction of β-glucanase. In this study, five single factors (loading volume, pH, separation gas velocity, fermentation loading concentration, surfactant concentration) of foam separation and harvest of β-glucanase produced by Pichia pastoris were studied. The best univariate condition was: 600 mL/min separation gas velocity, loading volume of 200 mL, initial enzyme concentration of 100 g/mL, surfactant concentration of 0.3 mg/mL and pH of 5. Based on the best univariate condition, the optimal separation conditions of β-glucanase were further explored, and the five-factor four-level orthogonal test was designed. From the experimental results, the best separation condition was: 600 mL/min, loading volume of 200 mL, initial enzyme concentration of 100 μg/mL, surfactant concentration of 0.5 mg/mL and pH of 5. Under this separation condition, the enrichment ratio (E) was 0.56 and the recovery rate (R) was 96.01%.","PeriodicalId":20324,"journal":{"name":"Polish Journal of Chemical Technology","volume":"24 1","pages":"1 - 7"},"PeriodicalIF":1.0,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42595279","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Innovative NPK Fertilizers based on Polyacrylamide and Polyvinyl Alcohol with Controlled Release of Nutrients 基于聚丙烯酰胺和聚乙烯醇的新型NPK肥料，可控制养分释放
IF 1 4区 工程技术
Polish Journal of Chemical Technology Pub Date : 2022-09-01 DOI: 10.2478/pjct-2022-0017
A. Białkowska, B. Borycka, M. Bakar, Agnieszka Rzany
{"title":"Innovative NPK Fertilizers based on Polyacrylamide and Polyvinyl Alcohol with Controlled Release of Nutrients","authors":"A. Białkowska, B. Borycka, M. Bakar, Agnieszka Rzany","doi":"10.2478/pjct-2022-0017","DOIUrl":"https://doi.org/10.2478/pjct-2022-0017","url":null,"abstract":"Abstract The aim of the present work was the preparation and properties evaluation of two innovative fertilizers based on multicomponent polymers characterized by a controlled release of nutrients. One method was based on a multi-component liquid containing different amounts of microelements NPK 12-5-6 fertilizers with polyacrylamide hydrogel beads. The second method concerned the cross-linking of biodegradable polyvinyl alcohol with multi-component NPK fertilizers. Polyacrylamide-based compositions with the highest amount of NPK salts as well as polyvinyl alcohol-based fertilizers in dense gel form, based on 60 phr crosslinking concentrate have shown optimal properties. Regardless of the type of fertilizers used, their components were released slowly. The obtained fertilizers were classified according to the kinetics of nutrient release. Fertilizers made from polyacrylamide based fertilizers have been classified into a group of controlled release fertilizers (CRF), while those made from biodegradable environmentally friendly polyvinyl alcohol have been defined as slow released fertilizers (SRF).","PeriodicalId":20324,"journal":{"name":"Polish Journal of Chemical Technology","volume":"24 1","pages":"14 - 18"},"PeriodicalIF":1.0,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42642526","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Effect of elevated pressure on gas-solid flow properties in a powder feeding system 高压对粉料系统气固流动特性的影响
IF 1 4区 工程技术
Polish Journal of Chemical Technology Pub Date : 2022-09-01 DOI: 10.2478/pjct-2022-0021
Guanlong Ren, Haijun Sun, Yi-hua Xu, C. Li
{"title":"Effect of elevated pressure on gas-solid flow properties in a powder feeding system","authors":"Guanlong Ren, Haijun Sun, Yi-hua Xu, C. Li","doi":"10.2478/pjct-2022-0021","DOIUrl":"https://doi.org/10.2478/pjct-2022-0021","url":null,"abstract":"Abstract In view of the powder feeding system, a multi-physical coupling model of the gas-powder-piston was established based on the Euler-Euler two-fluid model. The numerical simulation method was applied to explore the effects of dense gas-solid flow characteristics under different operating pressures. The results show that gas-solid pulsations at different operating pressures are mainly concentrated in the upper part of the powder tank. An elevated operating pressure efficiently decreases the powder layer area (εp = 0.1) fluctuation. As the operating pressure increases from 0.5 MPa to 3.0 MPa, the rising time and fluctuation rate of pressure are reduced by 71.4% and 62.3%, respectively, and the pressure in the tank has a long stabilization period. Meanwhile, the variation of the instantaneous powder flow rate is more stable and its average value is closer to the theoretical. A high-pressure environment is more conducive to the stable transportation of powder.","PeriodicalId":20324,"journal":{"name":"Polish Journal of Chemical Technology","volume":"24 1","pages":"41 - 52"},"PeriodicalIF":1.0,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41800490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
The Oxygen Reduction Activity of Nitrogen-doped Graphene 氮掺杂石墨烯的氧还原活性
IF 1 4区 工程技术
Polish Journal of Chemical Technology Pub Date : 2022-09-01 DOI: 10.2478/pjct-2022-0019
Liu Jian-feng, Sun Ge, Wang Ting, Ning Kai, Yuan Bin-xia, Pan Wei-guo
{"title":"The Oxygen Reduction Activity of Nitrogen-doped Graphene","authors":"Liu Jian-feng, Sun Ge, Wang Ting, Ning Kai, Yuan Bin-xia, Pan Wei-guo","doi":"10.2478/pjct-2022-0019","DOIUrl":"https://doi.org/10.2478/pjct-2022-0019","url":null,"abstract":"Abstract Graphite nitrogen, pyridine nitrogen and pyrrole nitrogen are the main nitrogen types in nitrogen-doped graphene materials. In order to investigate the mechanism of the oxygen reduction activity of nitrogen-doped graphene, several models of nitrogen-doped graphene with different nitrogen contents and different nitrogen types are developed. The nitrogen content is varied from 1.3 at% to 7.8 at%, and the adsorption energy is calculated according to the established models, then the band gaps are analyzed through the optimization results, so as to compare the magnitude of the conductivity. Finally, the oxygen reduction activity of graphite nitrogen-doped graphene (GNG) is found to be better than pyridine nitrogen-doped graphene (PDNG) and pyrrole nitrogen-doped graphene (PLNG) when the nitrogen content is lower than 2.6 at%, and the oxygen reduction activity of PDNG is the best when the nitrogen content was higher than 2.6 at%.","PeriodicalId":20324,"journal":{"name":"Polish Journal of Chemical Technology","volume":"24 1","pages":"29 - 34"},"PeriodicalIF":1.0,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42037699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Starch plasticization with choline dihydrogencitrate-based deep eutectic system 以柠檬酸二氢胆碱为基础的淀粉增塑深度共晶体系
IF 1 4区 工程技术
Polish Journal of Chemical Technology Pub Date : 2022-09-01 DOI: 10.2478/pjct-2022-0022
K. Wilpiszewska, Dorota Skowrońska
{"title":"Starch plasticization with choline dihydrogencitrate-based deep eutectic system","authors":"K. Wilpiszewska, Dorota Skowrońska","doi":"10.2478/pjct-2022-0022","DOIUrl":"https://doi.org/10.2478/pjct-2022-0022","url":null,"abstract":"Abstract Two-component deep eutectic solvents (DES) based on choline dihydrogencitrate and glycerol or urea were tested as starch plasticizers. Thermal analysis techniques were applied to characterize the properties of starch/DES systems. The X-ray diffractometry measurements revealed a significant decrease in crystallinity indicating that used DES exhibited the ability to penetrate the ordered regions of potato starch, which is a necessary feature of a true plasticizer. However, the differential scanning calorimetry and dynamic thermal analysis results surprisingly showed an increase of Tg of starch materials indicating chemical crosslinking at elevated temperature. The eutectic solvents based on choline dihydrogencitrate could act as a plasticizer and a simultaneously crosslinking agent.","PeriodicalId":20324,"journal":{"name":"Polish Journal of Chemical Technology","volume":"24 1","pages":"53 - 59"},"PeriodicalIF":1.0,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46175571","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Synthesis, physicochemical studies, fluorescence behavior, and anticancer properties of transition metal complexes with the pyridyl ligand 吡啶基过渡金属配合物的合成、理化研究、荧光行为和抗癌性能
IF 1 4区 工程技术
Polish Journal of Chemical Technology Pub Date : 2022-09-01 DOI: 10.2478/pjct-2022-0020
M. Azam, S. I. Al‐Resayes
{"title":"Synthesis, physicochemical studies, fluorescence behavior, and anticancer properties of transition metal complexes with the pyridyl ligand","authors":"M. Azam, S. I. Al‐Resayes","doi":"10.2478/pjct-2022-0020","DOIUrl":"https://doi.org/10.2478/pjct-2022-0020","url":null,"abstract":"Abstract A novel series of complexes with the formula [MLCl] [M = Co(II) (1), Ni(II) (2), Cu(II) (3), Zn(II) (4)] arising from Pyridyl ligand, N,N′-bis(1-(2-pyridyl)ethylidene)-2,2-dimethylpropane-1,3-diamine), ligand, L, was synthesized and investigated by elemental analyses, FT-IR, 1H and 13C NMR, Powder XRD, and thermal analyses. TGA analysis indicated that all complexes degraded in three different steps, while the PXRD examination showed well-defined sharp crystalline peaks for the complexes, indicating significant crystallinity. The antiproliferative activity of the ligand and its complexes were also evaluated in vitro against the HeLa (Human Cervical Cancer Cells) and HCT116 (Colon Cancer Cells) cell lines. The findings suggested complex 4 to be potential anticancer agent against these cell lines. In addition, ligand and its complexes also exhibited considerable emission properties.","PeriodicalId":20324,"journal":{"name":"Polish Journal of Chemical Technology","volume":"24 1","pages":"35 - 40"},"PeriodicalIF":1.0,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45490622","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Estimation of the upper flammability limits for alkanes in air at increased pressures 气压增加时烷烃在空气中可燃性上限的估计
IF 1 4区 工程技术
Polish Journal of Chemical Technology Pub Date : 2022-06-01 DOI: 10.2478/pjct-2022-0012
Xin Wan, Min Wang, Chun‐Yan Cao, Shuang Zhao, Zhiguo. Song
{"title":"Estimation of the upper flammability limits for alkanes in air at increased pressures","authors":"Xin Wan, Min Wang, Chun‐Yan Cao, Shuang Zhao, Zhiguo. Song","doi":"10.2478/pjct-2022-0012","DOIUrl":"https://doi.org/10.2478/pjct-2022-0012","url":null,"abstract":"Abstract A method is proposed to predict the upper flammability limits for alkanes in air at increased pressures. The upper flammability limits for methane, ethane, propane and n-butane/air mixtures at ambient temperature and initial pressure of 0.3 MPa–2.0 MPa are identified through the adiabatic flame temperature calculation model. The association of calculated adiabatic flame temperature with pressure is presented to determine the upper flammability limit. Research shows the good agreement between the forecast upper flammability limits with pressure dependence and the experimental upper flammability limit values. The average relative error of the estimated upper flammability limits for alkanes in air at high pressures reaches 2.52%.","PeriodicalId":20324,"journal":{"name":"Polish Journal of Chemical Technology","volume":"24 1","pages":"35 - 41"},"PeriodicalIF":1.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43108145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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