In recent years, there has been a considerable research interest in moving-bed biofilm reactor（MBBR） for its efficiency and stability. This work proposes a new way to modify the hydrophilicity of polyurethane foam...In recent years, there has been a considerable research interest in moving-bed biofilm reactor（MBBR） for its efficiency and stability. This work proposes a new way to modify the hydrophilicity of polyurethane foam（PU） carriers via the layer-by-layer self-assembly of hyperbranched polymeric diazonium salt（M-HB-DAS） and poly（sodium-p-styrenesulfonate）（PSS）. Modified carriers showed very good adsorption for microbes according to the results of scanning electron microscope（SEM）. Biochemical experiments on wastewater treatment confirm that the modified PU carriers can improve the removal rate of chemical oxygen demand（COD）.展开更多
4-Nitro-benzendiazonium (4-NBD) was found to form a 1:1 host-guest complex (NBD@CB) with cucurbit[7]uril (CB[7]) in aqueous solution and 4-NBD enters into the cavity of CB[7] with a binding constant of1.28 x 10~5 L/mo...4-Nitro-benzendiazonium (4-NBD) was found to form a 1:1 host-guest complex (NBD@CB) with cucurbit[7]uril (CB[7]) in aqueous solution and 4-NBD enters into the cavity of CB[7] with a binding constant of1.28 x 10~5 L/mol. NBD@CB can be decomposed into a nitrobenzene/4-nitrophenol mixture in a high total yield (61 %+ 33%) in the presence of CuCl, unlike the decomposition of 4-NBD in the presence of either CB[7] or CuCl, or both absence, where would result in significant amounts of unknown byproducts. This work might provide an economic and effective way to obtain arenes or phenols through the substitution of diazonium salts.展开更多
The selective recognition of nanoparticles (NPs) can be achieved by nanoparticle-imprinted matrices (NAIMs),where NPs are imprinted in a matrix followed by their removal to form voids that can reuptake the original NP...The selective recognition of nanoparticles (NPs) can be achieved by nanoparticle-imprinted matrices (NAIMs),where NPs are imprinted in a matrix followed by their removal to form voids that can reuptake the original NPs.The recognition depends on supramolecular interactions between the matrix and the shell of the NPs,as well as on the geometrical suitability of the imprinted voids to accommodate the NPs.Here,gold NPs stabilized with citrate (AuNPs-cit) were preadsorbed onto a conductive surface followed by electrografting of p-aryldiazonium salts (ADS) with different functional groups.The thickness of the matrix was carefully controlled by altering the scan number.The AuNPs-cit were removed by electrochemical dissolution.The recognition of the NAIMs was determined by the reuptake of the original AuNPs-cit by the imprinted voids.We found that the recognition efficiency is a function of the thickness of the NAIM layer and is sensitive to the chemical structure of the matrix.Specifically,a subtle change of the functional group of the p-aryldiazonium building block,which was varied from an ether to an ester,significantly affected the recognition of the NPs.展开更多
基金Supported by the National Natural Science Foundation of China（Nos.21474056, 21674058）.
文摘In recent years, there has been a considerable research interest in moving-bed biofilm reactor（MBBR） for its efficiency and stability. This work proposes a new way to modify the hydrophilicity of polyurethane foam（PU） carriers via the layer-by-layer self-assembly of hyperbranched polymeric diazonium salt（M-HB-DAS） and poly（sodium-p-styrenesulfonate）（PSS）. Modified carriers showed very good adsorption for microbes according to the results of scanning electron microscope（SEM）. Biochemical experiments on wastewater treatment confirm that the modified PU carriers can improve the removal rate of chemical oxygen demand（COD）.
基金financially supported by the National Natural Science Foundation of China (Nos. 21572063 and 21372076)the Science Fund for Creative Research Groups (No. 21421004)+1 种基金the Program of Introducing Talents of Discipline to Universities (No. B16017)the Fundamental Research Funds for the Central Universities (No. 222201717003)
文摘4-Nitro-benzendiazonium (4-NBD) was found to form a 1:1 host-guest complex (NBD@CB) with cucurbit[7]uril (CB[7]) in aqueous solution and 4-NBD enters into the cavity of CB[7] with a binding constant of1.28 x 10~5 L/mol. NBD@CB can be decomposed into a nitrobenzene/4-nitrophenol mixture in a high total yield (61 %+ 33%) in the presence of CuCl, unlike the decomposition of 4-NBD in the presence of either CB[7] or CuCl, or both absence, where would result in significant amounts of unknown byproducts. This work might provide an economic and effective way to obtain arenes or phenols through the substitution of diazonium salts.
文摘The selective recognition of nanoparticles (NPs) can be achieved by nanoparticle-imprinted matrices (NAIMs),where NPs are imprinted in a matrix followed by their removal to form voids that can reuptake the original NPs.The recognition depends on supramolecular interactions between the matrix and the shell of the NPs,as well as on the geometrical suitability of the imprinted voids to accommodate the NPs.Here,gold NPs stabilized with citrate (AuNPs-cit) were preadsorbed onto a conductive surface followed by electrografting of p-aryldiazonium salts (ADS) with different functional groups.The thickness of the matrix was carefully controlled by altering the scan number.The AuNPs-cit were removed by electrochemical dissolution.The recognition of the NAIMs was determined by the reuptake of the original AuNPs-cit by the imprinted voids.We found that the recognition efficiency is a function of the thickness of the NAIM layer and is sensitive to the chemical structure of the matrix.Specifically,a subtle change of the functional group of the p-aryldiazonium building block,which was varied from an ether to an ester,significantly affected the recognition of the NPs.
