This study systematically examined the dissolution behavior of furazolidone in 12 different pure solvents and in aqueous solutions containing ethylenediaminetetraacetic acid disodium salt(EDTA-2Na).The solubility data...This study systematically examined the dissolution behavior of furazolidone in 12 different pure solvents and in aqueous solutions containing ethylenediaminetetraacetic acid disodium salt(EDTA-2Na).The solubility data indicated that polar aprotic solvents demonstrated a marginally higher solubility of furazolidone compared to alcohols and water.Interestingly,a co-solvency effect was observed in the aqueous solutions of EDTA-2Na,where the solubility of furazolidone initially increased and then decreased with the gradual addition of EDTA-2Na,peaking at a mass fraction of 0.03(1.949×10^(–5)at 323.15 K).The analysis using the Kamlet-Abboud-Taft Linear Solvation Energy Relationship(KAT-LSER)model suggested that the dissolution of furazolidone in these systems was predominantly influenced by non-specific solute-solvent and solvent-solvent interactions.Furthermore,Hansen solubility parameter calculations revealed that N,N-dimethylformamide(DMF)and N,N-dimethylacetamide(DMAC)exhibited superior dissolution capabilities compared to other solvents.It was also found that the partial solubility parameters played a crucial role in determining the overall solubility behavior.展开更多
The streaming potential of poly（vinyl butyral） （PVB） hollow fiber membrane was studied in different electrolyte solutions （including NaCl, KCl, CaCl2 and MgCl2）, the effects of ionic strength, ion valence and pH...The streaming potential of poly（vinyl butyral） （PVB） hollow fiber membrane was studied in different electrolyte solutions （including NaCl, KCl, CaCl2 and MgCl2）, the effects of ionic strength, ion valence and pH value on the streaming potential （SP） of the membrane were investigated. The zeta potentials and surface charge densities of the membrane were estimated on the basis of Helmholtz-Smoluchowski equation and Gouy-Chapmann theory. The results show that the PVB membrane has a weak negative charge due to the specific adsorption of ions. Moreover, the streaming potential, the zeta potential and the surface charge density of the membrane depend strongly on the salt concentration and the type and valence of ions. The iso-electric point （IEP） of the PVB membrane is arotmd 3.0 in the monovalent media （NaC1 and KC1） and 3.5 in divalent electrolytes （CaCl2 and MgCl2）. A few retentions were obtained for PVB membrane in low concentration solutions. This result verifies that the negative charged membrane surface can reject inorganic solutes by means of electrostatic repulsion effect even though the size of membrane pores is much larger than the size of salts.展开更多
基金Innovation and Entrepreneurship Training Program for College Students in Shanxi Province (Grant No. 2021100)。
文摘This study systematically examined the dissolution behavior of furazolidone in 12 different pure solvents and in aqueous solutions containing ethylenediaminetetraacetic acid disodium salt(EDTA-2Na).The solubility data indicated that polar aprotic solvents demonstrated a marginally higher solubility of furazolidone compared to alcohols and water.Interestingly,a co-solvency effect was observed in the aqueous solutions of EDTA-2Na,where the solubility of furazolidone initially increased and then decreased with the gradual addition of EDTA-2Na,peaking at a mass fraction of 0.03(1.949×10^(–5)at 323.15 K).The analysis using the Kamlet-Abboud-Taft Linear Solvation Energy Relationship(KAT-LSER)model suggested that the dissolution of furazolidone in these systems was predominantly influenced by non-specific solute-solvent and solvent-solvent interactions.Furthermore,Hansen solubility parameter calculations revealed that N,N-dimethylformamide(DMF)and N,N-dimethylacetamide(DMAC)exhibited superior dissolution capabilities compared to other solvents.It was also found that the partial solubility parameters played a crucial role in determining the overall solubility behavior.
基金Project(21176264)supported by the National Natural Science Foundation of ChinaProject(11JJ2010)supported by the Hunan Provincial Natural Science Foundation of China+1 种基金Project(CL11096)supported by the Undergraduate Innovation Training Foundation of Central South University,ChinaProject(BL12053)supported by the Undergraduate Innovation Training Foundation of Hunan Province,China
文摘The streaming potential of poly（vinyl butyral） （PVB） hollow fiber membrane was studied in different electrolyte solutions （including NaCl, KCl, CaCl2 and MgCl2）, the effects of ionic strength, ion valence and pH value on the streaming potential （SP） of the membrane were investigated. The zeta potentials and surface charge densities of the membrane were estimated on the basis of Helmholtz-Smoluchowski equation and Gouy-Chapmann theory. The results show that the PVB membrane has a weak negative charge due to the specific adsorption of ions. Moreover, the streaming potential, the zeta potential and the surface charge density of the membrane depend strongly on the salt concentration and the type and valence of ions. The iso-electric point （IEP） of the PVB membrane is arotmd 3.0 in the monovalent media （NaC1 and KC1） and 3.5 in divalent electrolytes （CaCl2 and MgCl2）. A few retentions were obtained for PVB membrane in low concentration solutions. This result verifies that the negative charged membrane surface can reject inorganic solutes by means of electrostatic repulsion effect even though the size of membrane pores is much larger than the size of salts.
