An empirical model for COD removal in a biological aerated filter （BAF） in the presence of 2,4,6-trinitrophenol （TNP） was developed, which related effluent COD to influent COD or hydraulic loading rate along the b...An empirical model for COD removal in a biological aerated filter （BAF） in the presence of 2,4,6-trinitrophenol （TNP） was developed, which related effluent COD to influent COD or hydraulic loading rate along the bed height. The overall reaction rate for substrate biodegradation could be described as pseudo first order. The experimental data of COD removal against reactor height were used to calculate the parameters in the empirical model. The COD concentration at different reactor height was expressed as a function of influent COD concentration and hydraulic loading rate, ln（C0/C）=0.124H/QC0^0.77 and ln（C/C0）=-5.63H/L^0.94, respectively, under the experimental condition. The models may be used to predict the COD removal profiles along the reactor height at different hydraulic loading rates and influent COD concentration for design, selection and sizing of BAF.展开更多
A novel cationic Pt(Ⅱ)complex 2 with 2-(2,4-difluorophenyl)pyridine as the cyclometalating ligand and 1,10-phenanthroline as the auxiliary ligand has been synthesized and fully characterized.This complex exhibits muc...A novel cationic Pt(Ⅱ)complex 2 with 2-(2,4-difluorophenyl)pyridine as the cyclometalating ligand and 1,10-phenanthroline as the auxiliary ligand has been synthesized and fully characterized.This complex exhibits much higher aggregation-induced phosphorescent emission activity than that of a nonfluorinated complex 1 in CH_(3)CN/H_(2)O.The complex 2 demonstrates efficient detection on picric acid(PA)in CH_(3)CN/H_(2)O,providing a high quenching constant(K_(SV)=2.3×10^(4) L/mol)and a low limit of detection(LOD=0.26μmol/L).In addition,complex 2 shows high selectivity for detection of PA in real water samples.Density functional theory calculations and proton nuclear magnetic resonance spectra suggest that the detection mechanism is attributed to the photo-induced electron transfer.展开更多
A metal-organic framework [Eu_3L_3(CH_3COO)_2(H_2O)_2(μ_3-OH)]·3 DMF,(EuL, H_2L=9H-carbazole-2,7-dicarboxylic acid,DMF=N,N-dimethylformamide) has been synthesized under solvothermal conditions and structurally c...A metal-organic framework [Eu_3L_3(CH_3COO)_2(H_2O)_2(μ_3-OH)]·3 DMF,(EuL, H_2L=9H-carbazole-2,7-dicarboxylic acid,DMF=N,N-dimethylformamide) has been synthesized under solvothermal conditions and structurally characterized. In EuL,Eu_6O_8 clusters are four-bridged by carboxylates to form parallel-aligned Eu–O–C chains, which are further linked by the carbazole moieties of L^(2-) ligands to form the three-dimensional framework with rhombic channels. The EuL material with characteristic emission of Eu^(3+) ion exhibits significant luminescence quenching response for picric acid(PA) and the linear Stern-Volmer plot was observed in the concentration range of 0.05–0.15 mM with K_(sv) of 98074 M^(-1). As far as we know, this Ksv is among the highest values for COFs and MOFs in detection of PA. The excellent anti-interference ability and repeatability were also verified by experiments. Lastly, we investigated the luminescence quenching mechanism in the EuL sensing system.展开更多
The synthesis of two linear terpy-based metallo-supramolecular fluorescent coordination polymers through 1 ： 1 complexation of Zn^2＋ and Cd^2＋ ions with ditopic terpyridine ligand was reported. The dispersibility o...The synthesis of two linear terpy-based metallo-supramolecular fluorescent coordination polymers through 1 ： 1 complexation of Zn^2＋ and Cd^2＋ ions with ditopic terpyridine ligand was reported. The dispersibility of P1 and P2 was significantly improved in organic solvent and water through the introduction of hydrophilic oligo-ethyoxy side chain. Two polymers displayed yellow light emission both in solution and the solid state due to the intra-ligand charge transfer （ILCT） between the d^10 metal ions and the conjugated spacer unit. These coordination polymers were explored as fluorescent chemosensors for detecting picric acid in aqueous media, displaying high sensitivity and good selectivity. In addition, test strips were prepared from these polymers and exhibited the practical potential of detecting the NACs pollutants in the outdoor water for public safety and security.展开更多
A highly stable fluorescent terbium MOF(Tb_(4)(paip)_(6)·1.2 H_(2) O,paip = 5-(1 H-pyrazole-4-yl)isophthalate)showing a sharp green emission(545 nm) and a quantum yield of 21.0% was successfully synthesized.This ...A highly stable fluorescent terbium MOF(Tb_(4)(paip)_(6)·1.2 H_(2) O,paip = 5-(1 H-pyrazole-4-yl)isophthalate)showing a sharp green emission(545 nm) and a quantum yield of 21.0% was successfully synthesized.This compound is shown to be a recyclable sensor for detecting picric acid in aqueous solution with both high sensitivity and selectivity,attributed to the electron transfer quenching mechanism.展开更多
A colorimetric and fluorometric dual probe based on a water-soluble polythiophene derivative(PMTPBA)was designed and synthesized.It can be applied to determination of picric acid(PA) in 100% aqueous solution.The appro...A colorimetric and fluorometric dual probe based on a water-soluble polythiophene derivative(PMTPBA)was designed and synthesized.It can be applied to determination of picric acid(PA) in 100% aqueous solution.The approach relies on the formation of supramolecular polythiophene assemblies in the presence of PA through electrostatic,charge transfer and π-π stacking interactions.This probe could be utilized for the rapid and visual detection of PA both in aqueous solution and solid support with high specificity and sensitivity.The detection limit of this sensor is as low as 5.0 × 10^-8 mol/L.展开更多
By solvothermal reaction of Cd(II)with organic ligand N,N’-bis(3,5-dicarboxylphenyl)-thiophene-2,5-dicarboxamide(H_(4)L),a water-stable complex[Cd_(4)(H_(2)L)_(4)(H_(2)O)_(10)]·2CH_(3)OH·8H_(2)O·4DMF(1...By solvothermal reaction of Cd(II)with organic ligand N,N’-bis(3,5-dicarboxylphenyl)-thiophene-2,5-dicarboxamide(H_(4)L),a water-stable complex[Cd_(4)(H_(2)L)_(4)(H_(2)O)_(10)]·2CH_(3)OH·8H_(2)O·4DMF(1,C_(102)H_(120)Cd_(4)N_(12)O_(64)S_(4))has been successfully synthetized(DMF=N,N-dimethylformamide).1 crystallizes in the triclinic space group of P1 with a=11.815(7),b=16.209(9),c=16.742(9)Å,α=82.224(13)°,β=76.741(13)°,γ=70.313(12)°,V=2932(3)Å^(3),M_(r)=3115.93,Z=1,F(000)=1584,D_(c)=1.765 Mg/cm^(3),μ=0.901 mm^(-1),GOOF=1.101,the final R=0.0391 and wR=0.1297 for 9007 observed reflections(I>2σ(I)).1 is a tetranuclear Cd(II)bicyclic complex with strong ligand-based blue emission and can stably exist in aqueous solutions over the pH range of 2~11.1exhibits high sensitivity,selectivity and anti-interference capability for picric acid(PA)detection in aqueous solution by luminescent quenching.The value of quenching constant(K_(sv))is 3.2×10^(4)M^(-1) within the PAconcentration range of 0~40μM and the detection limit is 6.89×10^(-7) M.Lastly,we went into depth on possible mechanism of the luminescent quenching.展开更多
Two highly emissive pyrenoviologen derivatives were synthesized and used to fabricate fluorescent sensors for detection of picric acid(PA)with good sensitivity and selectivity.The sensitivity of the sensor was attribu...Two highly emissive pyrenoviologen derivatives were synthesized and used to fabricate fluorescent sensors for detection of picric acid(PA)with good sensitivity and selectivity.The sensitivity of the sensor was attributed to the specific electrostatic association effect of the cationic pyrenoviologens to the picrate anions,which also gave the sensor special selectivity among other compounds with similar structure.The electron transfer between them was attributed to the fluorescence response.Fluorescence lifetime measurements revealed that the quenching is static in nature.The novel and efficient pyrenoviologen derivatives-based sensors offered a strategy to fabricate real-life PA sensor.展开更多
基金Supported by Innovation Grant for Graduate of Jiangsu Province (AD20246)
文摘An empirical model for COD removal in a biological aerated filter （BAF） in the presence of 2,4,6-trinitrophenol （TNP） was developed, which related effluent COD to influent COD or hydraulic loading rate along the bed height. The overall reaction rate for substrate biodegradation could be described as pseudo first order. The experimental data of COD removal against reactor height were used to calculate the parameters in the empirical model. The COD concentration at different reactor height was expressed as a function of influent COD concentration and hydraulic loading rate, ln（C0/C）=0.124H/QC0^0.77 and ln（C/C0）=-5.63H/L^0.94, respectively, under the experimental condition. The models may be used to predict the COD removal profiles along the reactor height at different hydraulic loading rates and influent COD concentration for design, selection and sizing of BAF.
基金financial support from the National Natural Science Foundation of China(No.21978042)the Fundamental Research Funds for the Central Universities(No.DUT22LAB610).
文摘A novel cationic Pt(Ⅱ)complex 2 with 2-(2,4-difluorophenyl)pyridine as the cyclometalating ligand and 1,10-phenanthroline as the auxiliary ligand has been synthesized and fully characterized.This complex exhibits much higher aggregation-induced phosphorescent emission activity than that of a nonfluorinated complex 1 in CH_(3)CN/H_(2)O.The complex 2 demonstrates efficient detection on picric acid(PA)in CH_(3)CN/H_(2)O,providing a high quenching constant(K_(SV)=2.3×10^(4) L/mol)and a low limit of detection(LOD=0.26μmol/L).In addition,complex 2 shows high selectivity for detection of PA in real water samples.Density functional theory calculations and proton nuclear magnetic resonance spectra suggest that the detection mechanism is attributed to the photo-induced electron transfer.
基金supported by the National Natural Science Foundation of China (61575096)Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) (YX03001)+2 种基金Jiangsu Province Double Innovation Talent Program (090300014001)Nanjing University of Posts & Telecommunications (NY212004, NY217074)Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX17_0748 and KYCX18_0857)
文摘A metal-organic framework [Eu_3L_3(CH_3COO)_2(H_2O)_2(μ_3-OH)]·3 DMF,(EuL, H_2L=9H-carbazole-2,7-dicarboxylic acid,DMF=N,N-dimethylformamide) has been synthesized under solvothermal conditions and structurally characterized. In EuL,Eu_6O_8 clusters are four-bridged by carboxylates to form parallel-aligned Eu–O–C chains, which are further linked by the carbazole moieties of L^(2-) ligands to form the three-dimensional framework with rhombic channels. The EuL material with characteristic emission of Eu^(3+) ion exhibits significant luminescence quenching response for picric acid(PA) and the linear Stern-Volmer plot was observed in the concentration range of 0.05–0.15 mM with K_(sv) of 98074 M^(-1). As far as we know, this Ksv is among the highest values for COFs and MOFs in detection of PA. The excellent anti-interference ability and repeatability were also verified by experiments. Lastly, we investigated the luminescence quenching mechanism in the EuL sensing system.
文摘The synthesis of two linear terpy-based metallo-supramolecular fluorescent coordination polymers through 1 ： 1 complexation of Zn^2＋ and Cd^2＋ ions with ditopic terpyridine ligand was reported. The dispersibility of P1 and P2 was significantly improved in organic solvent and water through the introduction of hydrophilic oligo-ethyoxy side chain. Two polymers displayed yellow light emission both in solution and the solid state due to the intra-ligand charge transfer （ILCT） between the d^10 metal ions and the conjugated spacer unit. These coordination polymers were explored as fluorescent chemosensors for detecting picric acid in aqueous media, displaying high sensitivity and good selectivity. In addition, test strips were prepared from these polymers and exhibited the practical potential of detecting the NACs pollutants in the outdoor water for public safety and security.
基金supported by the National Natural Science Foundation of China (NSFC, Nos.22035003, 91856124, 22001132and 19JCZDJC37200)China Postdoctoral Science Foundation(No.2019M651011)。
文摘A highly stable fluorescent terbium MOF(Tb_(4)(paip)_(6)·1.2 H_(2) O,paip = 5-(1 H-pyrazole-4-yl)isophthalate)showing a sharp green emission(545 nm) and a quantum yield of 21.0% was successfully synthesized.This compound is shown to be a recyclable sensor for detecting picric acid in aqueous solution with both high sensitivity and selectivity,attributed to the electron transfer quenching mechanism.
基金financially supported by the National Natural Science Foundation of China(No.31871877)Chinese Universities Scientific Fund(Nos.2018QC151,2019TC036)+1 种基金the"Talents Scheme"Program of Beijing(No.31050003)the Research Fund Program of Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources(No.2017B030314182)。
文摘A colorimetric and fluorometric dual probe based on a water-soluble polythiophene derivative(PMTPBA)was designed and synthesized.It can be applied to determination of picric acid(PA) in 100% aqueous solution.The approach relies on the formation of supramolecular polythiophene assemblies in the presence of PA through electrostatic,charge transfer and π-π stacking interactions.This probe could be utilized for the rapid and visual detection of PA both in aqueous solution and solid support with high specificity and sensitivity.The detection limit of this sensor is as low as 5.0 × 10^-8 mol/L.
基金supported by the National Natural Science Foundation of China(21973047)Jiangsu Province Double Innovation Talent Program(090300014001)。
文摘By solvothermal reaction of Cd(II)with organic ligand N,N’-bis(3,5-dicarboxylphenyl)-thiophene-2,5-dicarboxamide(H_(4)L),a water-stable complex[Cd_(4)(H_(2)L)_(4)(H_(2)O)_(10)]·2CH_(3)OH·8H_(2)O·4DMF(1,C_(102)H_(120)Cd_(4)N_(12)O_(64)S_(4))has been successfully synthetized(DMF=N,N-dimethylformamide).1 crystallizes in the triclinic space group of P1 with a=11.815(7),b=16.209(9),c=16.742(9)Å,α=82.224(13)°,β=76.741(13)°,γ=70.313(12)°,V=2932(3)Å^(3),M_(r)=3115.93,Z=1,F(000)=1584,D_(c)=1.765 Mg/cm^(3),μ=0.901 mm^(-1),GOOF=1.101,the final R=0.0391 and wR=0.1297 for 9007 observed reflections(I>2σ(I)).1 is a tetranuclear Cd(II)bicyclic complex with strong ligand-based blue emission and can stably exist in aqueous solutions over the pH range of 2~11.1exhibits high sensitivity,selectivity and anti-interference capability for picric acid(PA)detection in aqueous solution by luminescent quenching.The value of quenching constant(K_(sv))is 3.2×10^(4)M^(-1) within the PAconcentration range of 0~40μM and the detection limit is 6.89×10^(-7) M.Lastly,we went into depth on possible mechanism of the luminescent quenching.
基金supported by the National Natural Science Foundation of China(Nos.21603016,21704081,51603016 and21704005)Shaanxi College Students Innovation and Entrepreneurship Training Program(No.S201910710282)
文摘Two highly emissive pyrenoviologen derivatives were synthesized and used to fabricate fluorescent sensors for detection of picric acid(PA)with good sensitivity and selectivity.The sensitivity of the sensor was attributed to the specific electrostatic association effect of the cationic pyrenoviologens to the picrate anions,which also gave the sensor special selectivity among other compounds with similar structure.The electron transfer between them was attributed to the fluorescence response.Fluorescence lifetime measurements revealed that the quenching is static in nature.The novel and efficient pyrenoviologen derivatives-based sensors offered a strategy to fabricate real-life PA sensor.
基金Projects(82073604, 81903369) supported by the National Natural Science Foundation of ChinaProject(S202010555075) supported by the National Innovation Training Program for College Students,ChinaProject (CX20210962) supported by the Postgraduate Research and Innovation Project of Hunan Province,China。
