Toward the imperative treatment of the industrial wastewater containing 4-nitrophenol(4-NP)and industrial solid waste red mud(RM),an innovative approach of“Using waste to treat waste”is developed.Valuable element Al...Toward the imperative treatment of the industrial wastewater containing 4-nitrophenol(4-NP)and industrial solid waste red mud(RM),an innovative approach of“Using waste to treat waste”is developed.Valuable element Al is leached from the RM first,the resultant NaAlO_(2) solution is hydrothermally converted toγ-AlOOH hierarchical porous microspheres(RMγ-AlOOH HPMSs,average diameter:2.0μm,SBET:77.81 m^(2) g^(-1),pore volume:0.38 cm^(3) g^(-1))in the presence of urea.The subsequent mild thermal conversion results inγ-Al_(2)O_(3) hierarchical porous microspheres(RMγ-Al_(2)O_(3) HPMSs).Both of the RMγ-AlOOH and RMγ-Al_(2)O_(3) HPMSs are employed as the Pd catalyst support for the catalytic reduction of 4-NP.Particularly,the as-obtained composite Pd/RMγ-AlOOH and Pd/RMγ-Al_(2)O_(3) exhibit excellent catalytic activities with superior knor as 8204.5 and 4831.4 s^(-1) g^(-1),respectively,significantly higher than that of most Pd based catalysts.Moreover,the excellent catalytic stability and durability of the Pd/RMγ-AlOOH and Pd/RMγ-Al_(2)O_(3) within 10 successive cycles of reduction enable the present industrial solid waste RM inducedγ-AlOOH andγ-Al_(2)O_(3) HPMSs as great promising Pd catalyst support for the reduction of the industrial wastewater containing 4-NP.展开更多
A simple 8-quinolinecarboxaldehyde derived antipyrine Schiff base （QA） was synthesized and characterized, which exhibited high selectivity to Cr^3＋ over other metal cations. The Cr^3＋ recognition of QA could be ac...A simple 8-quinolinecarboxaldehyde derived antipyrine Schiff base （QA） was synthesized and characterized, which exhibited high selectivity to Cr^3＋ over other metal cations. The Cr^3＋ recognition of QA could be achieved by means of fluorescense and absorption spectra, moreover, the obvious color change from colorless to yellowish is easily observed by naked-eyes. The binding constant of QA to Cr^3＋ was evaluated by spectral titration and the binding model was in 1 ： 1 stoichiometry measured by Job＇s plot.展开更多
The manipulation of supramolecular assembly enables single-component architectures to possess diverse structures and functions.Here,we report directed phase transitions of dipeptide supramolecular gel to crystals with...The manipulation of supramolecular assembly enables single-component architectures to possess diverse structures and functions.Here,we report directed phase transitions of dipeptide supramolecular gel to crystals with excellent selectivity and tunable mechanical properties.To be specific,lamellar-to-orthorhombic rearrangement of dipeptide molecules in the supramolecular assembly was guided by application of ammonia gas,while lamellar-tohexagonal realignment was generated upon water vapor exposure of the assembly.Importantly,this crystal phase control originated from distinct gas-mediated reconstitution of hydrogen-bonding interactions,which endowed the dipeptide materials with remarkably modulated stiffness.The selective phase transformation offers a simple and effective platform for self-assembling peptide crystals with diverse long-range-ordered structures from a single gel-state aggregation.This work opens up new perspectives on peptide-based biomaterials via gas-directed hydrogen-bonding chemistry.展开更多
基金supported by the State Key Laboratory of Organic-Inorganic Composites (No.oic-202101009)State Key Laboratory of Chemical Engineering (No.SKL-ChE-21A02),China。
文摘Toward the imperative treatment of the industrial wastewater containing 4-nitrophenol(4-NP)and industrial solid waste red mud(RM),an innovative approach of“Using waste to treat waste”is developed.Valuable element Al is leached from the RM first,the resultant NaAlO_(2) solution is hydrothermally converted toγ-AlOOH hierarchical porous microspheres(RMγ-AlOOH HPMSs,average diameter:2.0μm,SBET:77.81 m^(2) g^(-1),pore volume:0.38 cm^(3) g^(-1))in the presence of urea.The subsequent mild thermal conversion results inγ-Al_(2)O_(3) hierarchical porous microspheres(RMγ-Al_(2)O_(3) HPMSs).Both of the RMγ-AlOOH and RMγ-Al_(2)O_(3) HPMSs are employed as the Pd catalyst support for the catalytic reduction of 4-NP.Particularly,the as-obtained composite Pd/RMγ-AlOOH and Pd/RMγ-Al_(2)O_(3) exhibit excellent catalytic activities with superior knor as 8204.5 and 4831.4 s^(-1) g^(-1),respectively,significantly higher than that of most Pd based catalysts.Moreover,the excellent catalytic stability and durability of the Pd/RMγ-AlOOH and Pd/RMγ-Al_(2)O_(3) within 10 successive cycles of reduction enable the present industrial solid waste RM inducedγ-AlOOH andγ-Al_(2)O_(3) HPMSs as great promising Pd catalyst support for the reduction of the industrial wastewater containing 4-NP.
基金We thank the metallurgical research foundation in University of Science and Technology of Beijing the National Natural Science Foundation of China （No. 20972015） and the Natural Science Foundation of Bei-jing （No. 2112026） for financial support.
文摘A simple 8-quinolinecarboxaldehyde derived antipyrine Schiff base （QA） was synthesized and characterized, which exhibited high selectivity to Cr^3＋ over other metal cations. The Cr^3＋ recognition of QA could be achieved by means of fluorescense and absorption spectra, moreover, the obvious color change from colorless to yellowish is easily observed by naked-eyes. The binding constant of QA to Cr^3＋ was evaluated by spectral titration and the binding model was in 1 ： 1 stoichiometry measured by Job＇s plot.
基金The authors gratefully acknowledge the financial support for this research from the National Nature Science Foundation of China(nos.21961142022,21872150,and 22072160)J.F.particularly thanks to the Youth Innovation Promotion Association of CAS(no.2016032)Institute of Chemistry,CAS(no.Y6290512B1).
文摘The manipulation of supramolecular assembly enables single-component architectures to possess diverse structures and functions.Here,we report directed phase transitions of dipeptide supramolecular gel to crystals with excellent selectivity and tunable mechanical properties.To be specific,lamellar-to-orthorhombic rearrangement of dipeptide molecules in the supramolecular assembly was guided by application of ammonia gas,while lamellar-tohexagonal realignment was generated upon water vapor exposure of the assembly.Importantly,this crystal phase control originated from distinct gas-mediated reconstitution of hydrogen-bonding interactions,which endowed the dipeptide materials with remarkably modulated stiffness.The selective phase transformation offers a simple and effective platform for self-assembling peptide crystals with diverse long-range-ordered structures from a single gel-state aggregation.This work opens up new perspectives on peptide-based biomaterials via gas-directed hydrogen-bonding chemistry.
