With the outbreak of COVID-19,disinfection protection has become a necessary measure to prevent infection.As a new type of disinfectant,potassium peroxymonosulfate compound salt(PMS)has the advantages of good bacteric...With the outbreak of COVID-19,disinfection protection has become a necessary measure to prevent infection.As a new type of disinfectant,potassium peroxymonosulfate compound salt(PMS)has the advantages of good bactericidal effect,non-toxicity,high safety and stability.However,the current PMS products with irregular particle shapes lead to poor flowability,high hygroscopicity,poor stability of reactive oxygen species(ROS)and serious caking problems.In this work,an agglomeration-dissolution mechanism was designed to prepare spherical PMS particles with large size(>300μm)and high sphericity(up to 90%),effectively addressing the above problems.Shaping(dissolution and abrasion)is the key to improving sphericity,which is mainly controlled by the design of the heating mode,residence time and stirring rate.Compared with the irregular PMS particles,the large spherical particles present better flowability(angle of repose decreased by 35.80%,Carr's index decreased by 64.29%,Hausner's ratio decreased by 19.14%),lower hygroscopicity(decreased by 38.0%),lower caking ratio(decreased by 84.50%),and higher stability(the monthly loss of ROS was reduced by 61.68%).The agglomeration-dissolution mechanism demonstrates the crystallization,agglomeration,dissolution and abrasion process of inorganic salt crystals,providing an opportunity to prepare high-end inorganic crystal materials with high-quality morphologies.展开更多
The changes of microbial community structures and functional genes during the biodegradation of single phenol and phenol plus p-cresol under high salt condition were explored.It was found that the phenol-fed system（...The changes of microbial community structures and functional genes during the biodegradation of single phenol and phenol plus p-cresol under high salt condition were explored.It was found that the phenol-fed system（PFS） exhibited stronger degrading abilities and more stable biomass than that of the phenol plus p-cresol-fed system（PCFS）.The microbial community structures were revealed by a modern DNA fingerprint technique,ribosomal intergenic spacer analysis（RISA）.The results indicated that the microbial community of PFS changed obviously when gradually increased phenol concentration,while PCFS showed a little change.16S rRNA sequence analysis of the major bands showed that Alcanivorax sp.genus was predominant species during phenolic compounds degradation.Furthermore,amplified functional DNA restriction analysis（AFDRA） on phenol hydroxylase genes showed that the fingerprints were substantially different in the two systems,and the fingerprints were not the same during the different operational periods.展开更多
The addition-hydrolysis reaction of benzimidazolium salt with some mono- and bifunctional amine nucleophiles is reported, and a novel method of biomimetic synthesis for formamides and heterocycle compounds is provided.
The formability of intermediate compounds for thirteen kinds of binary molten salt systems, including 1 179 phase diagrams was discussed by pattern recognition method with bond parameters as features. These systems we...The formability of intermediate compounds for thirteen kinds of binary molten salt systems, including 1 179 phase diagrams was discussed by pattern recognition method with bond parameters as features. These systems were MeX Me′X, MeX Me′X 2, MeX Me′X 3, MeX Me′X 4, MeX 2 Me′X 2, MeX 2 Me′X 3, MeX 2 Me′X 4, MeX 3 Me′X 3, MeNO 3 Me′(NO 3) 2, Me 2SO 4 Me′SO 4 (Me, Me′ denote metallic elements, X denotes halogen), Me AX B Me′ CX D (X is CrO 2- 4, WO 2- 4 or MoO 2- 4), and common cation systems MeX MeX′, MeX Me 2X′ (Me, Me′ denote metallic elements, X, X′ denote anion forming elements or radicals). It had been found that molten salt systems forming intermediate compounds and ones without intermediate compound distribute in different regions. Moreover, six general regularities for the formation of intermediate compounds in binary molten salt systems had been summarized on the basis of thirteen semi empirical models, which was obtained from the known phase diagrams.[展开更多
基金The authors are grateful to the financial support of the National Natural Science Foundation of China(grant No.22108195)Nature Science Foundation of Tianjin(grant No.21JCQNJC00580)+1 种基金Key R&D Program of Zhejiang(grant No.2022c01208)Haihe Laboratory of Sustainable Chemical Transformations,and the key project of State Key Laboratory of Chemical Engineering(grant No.SKL-ChE-20Z03).
文摘With the outbreak of COVID-19,disinfection protection has become a necessary measure to prevent infection.As a new type of disinfectant,potassium peroxymonosulfate compound salt(PMS)has the advantages of good bactericidal effect,non-toxicity,high safety and stability.However,the current PMS products with irregular particle shapes lead to poor flowability,high hygroscopicity,poor stability of reactive oxygen species(ROS)and serious caking problems.In this work,an agglomeration-dissolution mechanism was designed to prepare spherical PMS particles with large size(>300μm)and high sphericity(up to 90%),effectively addressing the above problems.Shaping(dissolution and abrasion)is the key to improving sphericity,which is mainly controlled by the design of the heating mode,residence time and stirring rate.Compared with the irregular PMS particles,the large spherical particles present better flowability(angle of repose decreased by 35.80%,Carr's index decreased by 64.29%,Hausner's ratio decreased by 19.14%),lower hygroscopicity(decreased by 38.0%),lower caking ratio(decreased by 84.50%),and higher stability(the monthly loss of ROS was reduced by 61.68%).The agglomeration-dissolution mechanism demonstrates the crystallization,agglomeration,dissolution and abrasion process of inorganic salt crystals,providing an opportunity to prepare high-end inorganic crystal materials with high-quality morphologies.
基金supported by the National Natural Science Foundation of China (No. 50608011)
文摘The changes of microbial community structures and functional genes during the biodegradation of single phenol and phenol plus p-cresol under high salt condition were explored.It was found that the phenol-fed system（PFS） exhibited stronger degrading abilities and more stable biomass than that of the phenol plus p-cresol-fed system（PCFS）.The microbial community structures were revealed by a modern DNA fingerprint technique,ribosomal intergenic spacer analysis（RISA）.The results indicated that the microbial community of PFS changed obviously when gradually increased phenol concentration,while PCFS showed a little change.16S rRNA sequence analysis of the major bands showed that Alcanivorax sp.genus was predominant species during phenolic compounds degradation.Furthermore,amplified functional DNA restriction analysis（AFDRA） on phenol hydroxylase genes showed that the fingerprints were substantially different in the two systems,and the fingerprints were not the same during the different operational periods.
基金This work was supported by the National Natural Science Foundation of China(NO.20172041)Provincial Natural Science Foundation of Shaanxi Province.
文摘The addition-hydrolysis reaction of benzimidazolium salt with some mono- and bifunctional amine nucleophiles is reported, and a novel method of biomimetic synthesis for formamides and heterocycle compounds is provided.
文摘The formability of intermediate compounds for thirteen kinds of binary molten salt systems, including 1 179 phase diagrams was discussed by pattern recognition method with bond parameters as features. These systems were MeX Me′X, MeX Me′X 2, MeX Me′X 3, MeX Me′X 4, MeX 2 Me′X 2, MeX 2 Me′X 3, MeX 2 Me′X 4, MeX 3 Me′X 3, MeNO 3 Me′(NO 3) 2, Me 2SO 4 Me′SO 4 (Me, Me′ denote metallic elements, X denotes halogen), Me AX B Me′ CX D (X is CrO 2- 4, WO 2- 4 or MoO 2- 4), and common cation systems MeX MeX′, MeX Me 2X′ (Me, Me′ denote metallic elements, X, X′ denote anion forming elements or radicals). It had been found that molten salt systems forming intermediate compounds and ones without intermediate compound distribute in different regions. Moreover, six general regularities for the formation of intermediate compounds in binary molten salt systems had been summarized on the basis of thirteen semi empirical models, which was obtained from the known phase diagrams.[
