s: A new method for the preparation of an organic-inorganic composite film of the heteropolyanion has been developed by modifying P(Mo2O7)6-7 to the indium tin oxide (ITO) electrode surface. The modified electrode dis...s: A new method for the preparation of an organic-inorganic composite film of the heteropolyanion has been developed by modifying P(Mo2O7)6-7 to the indium tin oxide (ITO) electrode surface. The modified electrode displayed a strong catalytic activity towards the reduction of IO3-. In the range of 1.0?0-6~5?0-4mol/L, the catalytic current was linear proportional to the IO3- concentration.展开更多
Separating I_(3)^(-)and IO_(3)^(-)from aqueous solutions is technically challenging due to their very similar charge density.Herein,we describe the in-situ synthesis of cobalt-based layered double hydroxides(Co-LDHs)b...Separating I_(3)^(-)and IO_(3)^(-)from aqueous solutions is technically challenging due to their very similar charge density.Herein,we describe the in-situ synthesis of cobalt-based layered double hydroxides(Co-LDHs)by decomposition of zeolite imidazole framework(ZIF)nanocrystals,whilst modulating the basal spacing in the Co-LDHs through anion intercalation(such as Br-,NO_(3)^(-),and Cl O_(4)^(-)).Co-LDH-NO_(3)^(-)possesses an optimal basal spacing of~4.69A,which is slightly smaller than the van der Waals diameter of IO_(3)^(-)(~4.79A),thus enabling selective adsorption of linear I_(3)^(-)(diameter~4.22A)via ion exchange in the LDH interlayer.Co-LDH-NO_(3)^(-)showed ultrafast I_(3)^(-)uptake kinetics involving strong“host-vip”interaction forces,achieving high dynamic uptake capacities of 119.94 and 127.18 mg/g in I_(3)^(-)/IO_(3)^(-)contaminated groundwater and tap water,respectively,and~100%separation efficiencies towards I_(3)^(-)over IO_(3)^(-).Co-LDH-Br-with a smaller basal spacing(4.06A)exhibited much slower separation kinetics,and Co-LDH-ClO_(4)^(-)with a~5.36Abasal spacing demonstrated poor separation efficiency under similar conditions.Ab initio molecular dynamics(AIMD)simulations were used to visually simulate the ion exchange process,with the results being consistent with the experimental observations.Furthermore,Co-LDH-NO_(3)^(-)demonstrated excellent reusability during dynamic breakthrough tests and I_(3)^(-)/IO_(3)^(-)separation cycles due to a“special memory effect”of the 2D interlayer.This work guides adsorbent design for the efficient removal and separation of iodine species from contaminated water.展开更多
基金Authors greatly appreciate the supports from the National Natural Science Foundation of China Returnee Foundation of Ministry of Education of China and Analytical Foundation of Nanjing University.
文摘s: A new method for the preparation of an organic-inorganic composite film of the heteropolyanion has been developed by modifying P(Mo2O7)6-7 to the indium tin oxide (ITO) electrode surface. The modified electrode displayed a strong catalytic activity towards the reduction of IO3-. In the range of 1.0?0-6~5?0-4mol/L, the catalytic current was linear proportional to the IO3- concentration.
基金supported by the National Natural Science Foundation of China(22322603,U2167218,U2067215)the Beijing Outstanding Young Scientist Program+1 种基金funding support from the MacDiarmid Institute for Advanced Materials and Nanotechnologythe Robert A.Welch Foundation(B0027)。
文摘Separating I_(3)^(-)and IO_(3)^(-)from aqueous solutions is technically challenging due to their very similar charge density.Herein,we describe the in-situ synthesis of cobalt-based layered double hydroxides(Co-LDHs)by decomposition of zeolite imidazole framework(ZIF)nanocrystals,whilst modulating the basal spacing in the Co-LDHs through anion intercalation(such as Br-,NO_(3)^(-),and Cl O_(4)^(-)).Co-LDH-NO_(3)^(-)possesses an optimal basal spacing of~4.69A,which is slightly smaller than the van der Waals diameter of IO_(3)^(-)(~4.79A),thus enabling selective adsorption of linear I_(3)^(-)(diameter~4.22A)via ion exchange in the LDH interlayer.Co-LDH-NO_(3)^(-)showed ultrafast I_(3)^(-)uptake kinetics involving strong“host-vip”interaction forces,achieving high dynamic uptake capacities of 119.94 and 127.18 mg/g in I_(3)^(-)/IO_(3)^(-)contaminated groundwater and tap water,respectively,and~100%separation efficiencies towards I_(3)^(-)over IO_(3)^(-).Co-LDH-Br-with a smaller basal spacing(4.06A)exhibited much slower separation kinetics,and Co-LDH-ClO_(4)^(-)with a~5.36Abasal spacing demonstrated poor separation efficiency under similar conditions.Ab initio molecular dynamics(AIMD)simulations were used to visually simulate the ion exchange process,with the results being consistent with the experimental observations.Furthermore,Co-LDH-NO_(3)^(-)demonstrated excellent reusability during dynamic breakthrough tests and I_(3)^(-)/IO_(3)^(-)separation cycles due to a“special memory effect”of the 2D interlayer.This work guides adsorbent design for the efficient removal and separation of iodine species from contaminated water.
