In this work,the stable layer structure of serpentine,which seriously restricts the extraction of magnesium,was broken down,and a nearly 94%leaching efficiency of Mg was obtained by adding 5%fluorite powder.Compared w...In this work,the stable layer structure of serpentine,which seriously restricts the extraction of magnesium,was broken down,and a nearly 94%leaching efficiency of Mg was obtained by adding 5%fluorite powder.Compared with the system without fluorite,the Mg leaching efficiency increased by 36.42%.This result was achieved because the complexation of fluorinion(F)with Si in serpentine promoted a distorted tetrahedral orientation,which led to a loose crystal structure of serpentine and contributed to exposing more Mg for a remarkable increase in Mg recovery.It is suggested that fluorite powder could replace expensive assisted reagents in the leaching process,which would markedly decreased the cost.Moreover,an energy-efficient‘‘solvent displacement crystallization”(SDC)method was employed to efficiently recover magnesium(99.04%)from pregnant solutions.At the same time,the reuse of fluorinecontaining solutions was explored.展开更多
Solvent residue is inevitable to occur in solution processed thin films,but its influence on the thin film quality has not been identified and addressed to date.Methylammonium acetate(MAAc)ionic liquid has recently be...Solvent residue is inevitable to occur in solution processed thin films,but its influence on the thin film quality has not been identified and addressed to date.Methylammonium acetate(MAAc)ionic liquid has recently been realized as an environmentally friendly solvent for solution processed perovskites.The specific high viscosity,low vapor pressure and strong association with perovskite precursor of the MAAc solvent is a double-edged sword,which endowed an advantageously ambient air operational and anti-solvent free perovskite deposition,but the MAAc is likely to be retained within the film and bring in detrimental effects on device performance of the corresponding solar cells.Herein,we reported a novel route to eliminate the residual solvent via a facial hydrochloric acid(HCl)annealing post-treatment(HAAP).In particular,chemical displacement reaction between the incorporated HCl and residual MAAc can be initiated to form volatile MACl and HAc,efficiently extracting MAAc residue.In the meanwhile,the stimulated mass transport via downward penetration and upward escape can trigger secondary perovskite growth with enlarged grain size and smoothened surface,leading to reduced defect state and improved interfacial contact intimacy,and also partial chloride ions are able to enter the crystal lattice to stabilize perovskite phase structure.As a result,a champion efficiency up to20.78%originating from enhanced Voc was achieved,and more than 96%of its initial efficiency can be maintained after 1000 h shelf-storage.展开更多
In previous paper a new adsorption isotherm which relates the amount of solute absorbed to the solvent concentration is proposed and simplified, and it only can be used at lower solute concentration. In this article t...In previous paper a new adsorption isotherm which relates the amount of solute absorbed to the solvent concentration is proposed and simplified, and it only can be used at lower solute concentration. In this article the scope of the new adsorption isotherm is extended and the expressions with three and four parameters are obtained. The equations with multi parameters are valid when the adsorbed amounts are larger and show non linear logarithmic relationships. Tests with a homologue of aromatic alcohols by frontal analysis in reversed phase liquid chromatography demonstrate that the experimental results fit those equations well. In addition, the predicted values by the multi parameters were found to fit the experimental values well also. The parameters have physical meaning only for the two parameter equation for the aromatic alcohols.展开更多
基金The authors gratefully thank the Fundamental Research Funds for the Central Universities(N2001018)Liaoning Revitaliza-tion Talents Program(XLYC1807089)for financial support。
文摘In this work,the stable layer structure of serpentine,which seriously restricts the extraction of magnesium,was broken down,and a nearly 94%leaching efficiency of Mg was obtained by adding 5%fluorite powder.Compared with the system without fluorite,the Mg leaching efficiency increased by 36.42%.This result was achieved because the complexation of fluorinion(F)with Si in serpentine promoted a distorted tetrahedral orientation,which led to a loose crystal structure of serpentine and contributed to exposing more Mg for a remarkable increase in Mg recovery.It is suggested that fluorite powder could replace expensive assisted reagents in the leaching process,which would markedly decreased the cost.Moreover,an energy-efficient‘‘solvent displacement crystallization”(SDC)method was employed to efficiently recover magnesium(99.04%)from pregnant solutions.At the same time,the reuse of fluorinecontaining solutions was explored.
基金financially supported by the National Natural Science Foundation of China(Grants 51972172,61705102,61605073,61935017 and 91833304)Projects of International Cooperation and Exchanges NSFC(51811530018)+3 种基金the Young 1000 Talents Global Recruitment Program of Chinathe Jiangsu Specially Appointed Professor Program“Six talent peaks”Project in Jiangsu Province,Chinathe fellowship of China Postdoctoral Science Foundation(2020M672181)。
文摘Solvent residue is inevitable to occur in solution processed thin films,but its influence on the thin film quality has not been identified and addressed to date.Methylammonium acetate(MAAc)ionic liquid has recently been realized as an environmentally friendly solvent for solution processed perovskites.The specific high viscosity,low vapor pressure and strong association with perovskite precursor of the MAAc solvent is a double-edged sword,which endowed an advantageously ambient air operational and anti-solvent free perovskite deposition,but the MAAc is likely to be retained within the film and bring in detrimental effects on device performance of the corresponding solar cells.Herein,we reported a novel route to eliminate the residual solvent via a facial hydrochloric acid(HCl)annealing post-treatment(HAAP).In particular,chemical displacement reaction between the incorporated HCl and residual MAAc can be initiated to form volatile MACl and HAc,efficiently extracting MAAc residue.In the meanwhile,the stimulated mass transport via downward penetration and upward escape can trigger secondary perovskite growth with enlarged grain size and smoothened surface,leading to reduced defect state and improved interfacial contact intimacy,and also partial chloride ions are able to enter the crystal lattice to stabilize perovskite phase structure.As a result,a champion efficiency up to20.78%originating from enhanced Voc was achieved,and more than 96%of its initial efficiency can be maintained after 1000 h shelf-storage.
基金ProjectsupportedbytheNationalNaturalScienceFoundationofChina (No .2 0 175 0 16)
文摘In previous paper a new adsorption isotherm which relates the amount of solute absorbed to the solvent concentration is proposed and simplified, and it only can be used at lower solute concentration. In this article the scope of the new adsorption isotherm is extended and the expressions with three and four parameters are obtained. The equations with multi parameters are valid when the adsorbed amounts are larger and show non linear logarithmic relationships. Tests with a homologue of aromatic alcohols by frontal analysis in reversed phase liquid chromatography demonstrate that the experimental results fit those equations well. In addition, the predicted values by the multi parameters were found to fit the experimental values well also. The parameters have physical meaning only for the two parameter equation for the aromatic alcohols.
