Novel adsorbent, Fe（Ⅲ）-loaded ligand exchange cotton cellulose adsorbent [Fe（Ⅲ） LECCA], was used to in vestigate the adsorption performances and mechanism of fluoride removal from aqueous solutions. The adsorben...Novel adsorbent, Fe（Ⅲ）-loaded ligand exchange cotton cellulose adsorbent [Fe（Ⅲ） LECCA], was used to in vestigate the adsorption performances and mechanism of fluoride removal from aqueous solutions. The adsorbent was found to adsorb fluoride rapidly and effectively. The fluoride removal was influenced by pH. Adsorption mode followed first-order reaction at different temperature, theapparent adsorption activated energy Ea was 6.37 kJ·mol^-1, and adsorption enthalpy △H was 5.35 kJ·mol^-1. The adsorption enfluoride on adsorbent was 3.2 mmol·g^-1 （dry weight）. The maximal integer coordination ratio of fluoride with Fe（Ⅲ） LECCA was 3：1. The ligand exchange mechanism of adsorption was elucidated through chemical methods and IR spectral analysis.展开更多
The invention of a well-defined Cu(Ⅲ)fluoride complex Me_(4)N^(+)[Cu(CF_(3))_(3)(F)]^(-)1 enabled to access a versatile of functionalized Cu(Ⅲ)complexes[Me_(4)N]^(+)[Cu(X)(CF_(3))_(3)]^(-)(X=C_(6)F_(5),C_(6)F_(5)C≡...The invention of a well-defined Cu(Ⅲ)fluoride complex Me_(4)N^(+)[Cu(CF_(3))_(3)(F)]^(-)1 enabled to access a versatile of functionalized Cu(Ⅲ)complexes[Me_(4)N]^(+)[Cu(X)(CF_(3))_(3)]^(-)(X=C_(6)F_(5),C_(6)F_(5)C≡C,CN,Cl,N_(3),^(t)BuOO,SCN,OAc,SAr),many of them for the first time.The availability of these complexes allowed us to evaluate the trans-influence order of ligand in Cu(Ⅲ)complexes:Bn>CF_(3)^(-)>C_(6)F_(5)^(-)>N_(3)^(-)>py~CH_(3)^(-)~C_(6)F_(5)C≡C>NO_(2)PhO^(-)~^(t)BuOO^(-)~CH_(3)COO^(-)>F^(-).展开更多
ine heterobinuclear complexes of Cu (Ⅱ)-RE (Ⅲ) with N, N′-bis-(3-car-boxylsalicylidene ) trimetliylenediamine (TS) were syntliesized and characterized bymeans of elemental analyses, molar conductivity, thermogravim...ine heterobinuclear complexes of Cu (Ⅱ)-RE (Ⅲ) with N, N′-bis-(3-car-boxylsalicylidene ) trimetliylenediamine (TS) were syntliesized and characterized bymeans of elemental analyses, molar conductivity, thermogravimetry,IR and elec-tronic spectra. The measurements of variable-temperature magnetic susceptibilitysliow that there exists only a very weak antiferromagnetic spin exchange interactionbetween the ions of Cut(Ⅱ) and RE(Ⅲ) in CuRETSCI . 3H_2O.展开更多
文摘Novel adsorbent, Fe（Ⅲ）-loaded ligand exchange cotton cellulose adsorbent [Fe（Ⅲ） LECCA], was used to in vestigate the adsorption performances and mechanism of fluoride removal from aqueous solutions. The adsorbent was found to adsorb fluoride rapidly and effectively. The fluoride removal was influenced by pH. Adsorption mode followed first-order reaction at different temperature, theapparent adsorption activated energy Ea was 6.37 kJ·mol^-1, and adsorption enthalpy △H was 5.35 kJ·mol^-1. The adsorption enfluoride on adsorbent was 3.2 mmol·g^-1 （dry weight）. The maximal integer coordination ratio of fluoride with Fe（Ⅲ） LECCA was 3：1. The ligand exchange mechanism of adsorption was elucidated through chemical methods and IR spectral analysis.
基金the financial support from the National Key Research and Development Program of China(No.2021YFF0701700)the National Natural Science Foundation of China(22061160465).
文摘The invention of a well-defined Cu(Ⅲ)fluoride complex Me_(4)N^(+)[Cu(CF_(3))_(3)(F)]^(-)1 enabled to access a versatile of functionalized Cu(Ⅲ)complexes[Me_(4)N]^(+)[Cu(X)(CF_(3))_(3)]^(-)(X=C_(6)F_(5),C_(6)F_(5)C≡C,CN,Cl,N_(3),^(t)BuOO,SCN,OAc,SAr),many of them for the first time.The availability of these complexes allowed us to evaluate the trans-influence order of ligand in Cu(Ⅲ)complexes:Bn>CF_(3)^(-)>C_(6)F_(5)^(-)>N_(3)^(-)>py~CH_(3)^(-)~C_(6)F_(5)C≡C>NO_(2)PhO^(-)~^(t)BuOO^(-)~CH_(3)COO^(-)>F^(-).
文摘ine heterobinuclear complexes of Cu (Ⅱ)-RE (Ⅲ) with N, N′-bis-(3-car-boxylsalicylidene ) trimetliylenediamine (TS) were syntliesized and characterized bymeans of elemental analyses, molar conductivity, thermogravimetry,IR and elec-tronic spectra. The measurements of variable-temperature magnetic susceptibilitysliow that there exists only a very weak antiferromagnetic spin exchange interactionbetween the ions of Cut(Ⅱ) and RE(Ⅲ) in CuRETSCI . 3H_2O.
