Environmentally persistent and bioaccumulative perfluorooctanic acid (PFOA) was difficult to be decomposed under the irradiation of 254 nm UV light.However,in the presence of 80μmol/L Fe(Ⅲ),80% of PFOA with initial ...Environmentally persistent and bioaccumulative perfluorooctanic acid (PFOA) was difficult to be decomposed under the irradiation of 254 nm UV light.However,in the presence of 80μmol/L Fe(Ⅲ),80% of PFOA with initial concentration of 48μmol/L (20 rag/L) was effectively degraded and 47.8% of fluorine atoms in PFOA molecule were transformed into inorganic fluoride ion after 4 h reaction.Shorter chain perfluorocarboxylic acids bearing C_3-C_7 and fluoride ion were detected and identified by LC/MS and IC as the degradation products in the aqueous solution.It was proposed that complexes of PFOA with Fe(Ⅲ) initiated degradation of PFOA irradiated with 254 nm UV light.展开更多
A selective and sensitive reagent of 2-pyridine carboxaldehyde isonicotinyl hydrazone(2-PYAINH) was synthesized and studied for the spectrophotometric determination of nickel, copper, cobalt, and iron in detail. At a ...A selective and sensitive reagent of 2-pyridine carboxaldehyde isonicotinyl hydrazone(2-PYAINH) was synthesized and studied for the spectrophotometric determination of nickel, copper, cobalt, and iron in detail. At a pH value of 7.0, 9.0, 9.0, and 8.0, respectively, which greatly increased the selectivity; nickel, copper, cobalt, and iron reacted with 2-PYAINH to form a 1:2 yellow-orange, 1:2 yellow-green, 1:2 yellow and 1:1 yellow complexes, with absorption peaks at 363, 352, 346, and 359 nm, respectively. Under the optimal conditions, Beer’s law was obeyed over the ranges of 0.01―1.4, 0.01―1.5, 0.01―2.7, and 0.01―5.4 mg/L, respectively. The apparent molar absorptivity and Sandell’s sensitivities were 8.4×104, 5.2×104, 7.1×104, and 3.9×104 L·mol 1·cm 1, respectively, and 0.00069, 0.0012, 0.00078, and 0.0014 μg·cm-2, respectively. The detection limits were found to be 0.001, 0.002, 0.003, and 0.01 mg/L, respectively. The detailed study of various interfering ions to make the method more sensitive was carried out and selective and several real samples were analyzed with satisfactory results.展开更多
Tris(d,d-dicampholylmethanato) iron(III)complex, Fe(dcm)3, was found to be an excellent catalyst for asymmetric oxygenation of styrene analogues into the corresponding epoxides. Good chemical yields and higher enantio...Tris(d,d-dicampholylmethanato) iron(III)complex, Fe(dcm)3, was found to be an excellent catalyst for asymmetric oxygenation of styrene analogues into the corresponding epoxides. Good chemical yields and higher enantioselectivity were obtained with combined use of molecular oxygen and an aldehyde at 30 ℃. Some factors influencing enantioselectivity were discussed.展开更多
The structure of the title complex [Fe2(μ-O)(bpb)2]n (bpb 2=1,2-bis(pyridine-2carboxamido) benzenate) has been characterized by single-crystal X-ray diffraction analysis.The complex (C36 H24 Fe2N8O5,Mr=760.33) crysta...The structure of the title complex [Fe2(μ-O)(bpb)2]n (bpb 2=1,2-bis(pyridine-2carboxamido) benzenate) has been characterized by single-crystal X-ray diffraction analysis.The complex (C36 H24 Fe2N8O5,Mr=760.33) crystallizes in the monoclinic space group P2 1/c with a=8.4615(17),b=33.704(7),c=11.173(2),β=91.12(3)o,V=3185.7(11)3,Z=4,D c=1.585 g/cm 3,μ(MoK)=0.970 mm-1,F(000)=1552,R int=0.0381,the final R=0.0454 and wR=0.1114.The magnetic susceptibilities of the complex have been examined in the temperature range of 2-300 K.The magnetic data were fitted to give the parameters of J d=-77.7(9) and J c=-11.5(6) cm-1.展开更多
Reaction of 3,5-pyridine-dicarboxylic acid(3,5-PydcH2) with iron salt in hydrothermal condition results in the formation of a three-dimensional self-assembly network formulated as [C14H14Fe2N2O12]n,and it has been str...Reaction of 3,5-pyridine-dicarboxylic acid(3,5-PydcH2) with iron salt in hydrothermal condition results in the formation of a three-dimensional self-assembly network formulated as [C14H14Fe2N2O12]n,and it has been structurally characterized by elemental analysis,IR spectra and X-ray diffraction.It crystallizes in the monoclinic system,space group C2/c with a=9.9633(15),b=12.0942(18),c=7.4297(11) and β=105.822o.The units of Fe2(pydc)2·2H2O are linked into a one-dimensional structure via the chelate carboxylate groups from the 3,5-pyridine-dicarboxylate.The interlayer hydrogen bonding interactions result in a three-dimensional supramolecular architecture.In the complex,the Fe(Ⅲ) ion displays a slightly distorted pentagonal bipyramidal geometry with seven coordination numbers.Cyclic-voltammetry measurement reveals the oxidation and reduction processes for the complex are quasi-reversible in nature.展开更多
Iron(Ⅲ) loaded novolac-based network adsorbents 1 and 2 were studied for efficient removal of azo-dye pollutants from aqueous solutions. The adsorption behavior was evaluated by using methyl orange and orange-G as mo...Iron(Ⅲ) loaded novolac-based network adsorbents 1 and 2 were studied for efficient removal of azo-dye pollutants from aqueous solutions. The adsorption behavior was evaluated by using methyl orange and orange-G as model azo dyes. The effect of parameters such as contact time and initial dye concentration on the adsorption of azo dyes was studied. The results showed that loading of Fe(Ⅲ) onto the sorbent networks has noticeable effect on azo-dye sorption capacity. The adsorption equilibrium data were fitted to Freundlich isotherm model. Besides, the reusability of the dye loaded sorbents was investigated on adjusting pH of solutions.展开更多
文摘Environmentally persistent and bioaccumulative perfluorooctanic acid (PFOA) was difficult to be decomposed under the irradiation of 254 nm UV light.However,in the presence of 80μmol/L Fe(Ⅲ),80% of PFOA with initial concentration of 48μmol/L (20 rag/L) was effectively degraded and 47.8% of fluorine atoms in PFOA molecule were transformed into inorganic fluoride ion after 4 h reaction.Shorter chain perfluorocarboxylic acids bearing C_3-C_7 and fluoride ion were detected and identified by LC/MS and IC as the degradation products in the aqueous solution.It was proposed that complexes of PFOA with Fe(Ⅲ) initiated degradation of PFOA irradiated with 254 nm UV light.
文摘A selective and sensitive reagent of 2-pyridine carboxaldehyde isonicotinyl hydrazone(2-PYAINH) was synthesized and studied for the spectrophotometric determination of nickel, copper, cobalt, and iron in detail. At a pH value of 7.0, 9.0, 9.0, and 8.0, respectively, which greatly increased the selectivity; nickel, copper, cobalt, and iron reacted with 2-PYAINH to form a 1:2 yellow-orange, 1:2 yellow-green, 1:2 yellow and 1:1 yellow complexes, with absorption peaks at 363, 352, 346, and 359 nm, respectively. Under the optimal conditions, Beer’s law was obeyed over the ranges of 0.01―1.4, 0.01―1.5, 0.01―2.7, and 0.01―5.4 mg/L, respectively. The apparent molar absorptivity and Sandell’s sensitivities were 8.4×104, 5.2×104, 7.1×104, and 3.9×104 L·mol 1·cm 1, respectively, and 0.00069, 0.0012, 0.00078, and 0.0014 μg·cm-2, respectively. The detection limits were found to be 0.001, 0.002, 0.003, and 0.01 mg/L, respectively. The detailed study of various interfering ions to make the method more sensitive was carried out and selective and several real samples were analyzed with satisfactory results.
文摘Tris(d,d-dicampholylmethanato) iron(III)complex, Fe(dcm)3, was found to be an excellent catalyst for asymmetric oxygenation of styrene analogues into the corresponding epoxides. Good chemical yields and higher enantioselectivity were obtained with combined use of molecular oxygen and an aldehyde at 30 ℃. Some factors influencing enantioselectivity were discussed.
基金supported by the Natural Science Foundation of China (No. 2117624)the Fundamental Research Funds for the Central Universities (China University of Mining and Technology)
文摘The structure of the title complex [Fe2(μ-O)(bpb)2]n (bpb 2=1,2-bis(pyridine-2carboxamido) benzenate) has been characterized by single-crystal X-ray diffraction analysis.The complex (C36 H24 Fe2N8O5,Mr=760.33) crystallizes in the monoclinic space group P2 1/c with a=8.4615(17),b=33.704(7),c=11.173(2),β=91.12(3)o,V=3185.7(11)3,Z=4,D c=1.585 g/cm 3,μ(MoK)=0.970 mm-1,F(000)=1552,R int=0.0381,the final R=0.0454 and wR=0.1114.The magnetic susceptibilities of the complex have been examined in the temperature range of 2-300 K.The magnetic data were fitted to give the parameters of J d=-77.7(9) and J c=-11.5(6) cm-1.
基金supported by the National Natural Science Foundation of China (Nos 20771054 and 20671076)the Natural Science Foundation of Henan Province (No 0311021200)
文摘Reaction of 3,5-pyridine-dicarboxylic acid(3,5-PydcH2) with iron salt in hydrothermal condition results in the formation of a three-dimensional self-assembly network formulated as [C14H14Fe2N2O12]n,and it has been structurally characterized by elemental analysis,IR spectra and X-ray diffraction.It crystallizes in the monoclinic system,space group C2/c with a=9.9633(15),b=12.0942(18),c=7.4297(11) and β=105.822o.The units of Fe2(pydc)2·2H2O are linked into a one-dimensional structure via the chelate carboxylate groups from the 3,5-pyridine-dicarboxylate.The interlayer hydrogen bonding interactions result in a three-dimensional supramolecular architecture.In the complex,the Fe(Ⅲ) ion displays a slightly distorted pentagonal bipyramidal geometry with seven coordination numbers.Cyclic-voltammetry measurement reveals the oxidation and reduction processes for the complex are quasi-reversible in nature.
文摘Iron(Ⅲ) loaded novolac-based network adsorbents 1 and 2 were studied for efficient removal of azo-dye pollutants from aqueous solutions. The adsorption behavior was evaluated by using methyl orange and orange-G as model azo dyes. The effect of parameters such as contact time and initial dye concentration on the adsorption of azo dyes was studied. The results showed that loading of Fe(Ⅲ) onto the sorbent networks has noticeable effect on azo-dye sorption capacity. The adsorption equilibrium data were fitted to Freundlich isotherm model. Besides, the reusability of the dye loaded sorbents was investigated on adjusting pH of solutions.
