Four magnetic anion exchange resins (MAERs) were used as adsorbents to purify drinking water. The effect of water quality (pH, temperature, ionic strength, etc.) on the performance of MAER for the removal of disso...Four magnetic anion exchange resins (MAERs) were used as adsorbents to purify drinking water. The effect of water quality (pH, temperature, ionic strength, etc.) on the performance of MAER for the removal of dissolved organic matter (DOM) was also investigated. Among the four studied MAERs, the strong base resin named NDMP- 1 with high water content and enhanced exchange capacity exhibited the highest removal rate of dissolved organic carbon (DOC) (48.9% removal rate) and UV-absorbing substances (82.4% removal rate) with a resin dose of 10 mL/L after 30 rain of contact time. The MAERs could also effectively remove inorganic matter such as sulfate, nitrate and fluoride. Because of the higher specific UV absorbance (SUVA) value, the DOM in the raw water was found to be removed more effectively than that in the clarified water by NDMP resin. The temperature showed a weak influence on the removal of DOC from 6 to 26℃, while a relatively strong one at 36℃. The removal of DOM by NDMP was also affected to some extent by the pH value. Moreover, increasing the sulfate concentration in the raw water could decrease the removal rates of DOC and UV-absorbing substances.展开更多
A novel, bifunctional, hypercrosslinked, magnetic resin W2 was prepared using divinylbenzene (DVB) and glycidyl methacrylate (GMA) as comonomers in three steps (i.e., suspension polymerization, amination and post...A novel, bifunctional, hypercrosslinked, magnetic resin W2 was prepared using divinylbenzene (DVB) and glycidyl methacrylate (GMA) as comonomers in three steps (i.e., suspension polymerization, amination and post-crosslinking reactions). To evaluate the adsorption of natural organic matter (NOM) and organic micropollutants (OMPs) on the obtained resin W2, two magnetic resins W1 (the precursor of W2 before post-crosslinking) and W0 (the precursor of W1 before amination) were chosen for comparison. The results indicated that W2 would be a promising material for the removal of both NOM and OMPs from aquatic environments.展开更多
基金supported by the National Natural Science Foundation of China (No.50938004)the National Science Funds for Young Scientists (No.51008152)the Jiangsu Nature Science Fund for Distinguished Scientists, China(No.BK2010006)
文摘Four magnetic anion exchange resins (MAERs) were used as adsorbents to purify drinking water. The effect of water quality (pH, temperature, ionic strength, etc.) on the performance of MAER for the removal of dissolved organic matter (DOM) was also investigated. Among the four studied MAERs, the strong base resin named NDMP- 1 with high water content and enhanced exchange capacity exhibited the highest removal rate of dissolved organic carbon (DOC) (48.9% removal rate) and UV-absorbing substances (82.4% removal rate) with a resin dose of 10 mL/L after 30 rain of contact time. The MAERs could also effectively remove inorganic matter such as sulfate, nitrate and fluoride. Because of the higher specific UV absorbance (SUVA) value, the DOM in the raw water was found to be removed more effectively than that in the clarified water by NDMP resin. The temperature showed a weak influence on the removal of DOC from 6 to 26℃, while a relatively strong one at 36℃. The removal of DOM by NDMP was also affected to some extent by the pH value. Moreover, increasing the sulfate concentration in the raw water could decrease the removal rates of DOC and UV-absorbing substances.
基金support provided by Program for Changjiang Scholars Innovative Research Team in University,NSFC(Nos.51290282 and 51208249)Jiangsu Nature Science Fund for Distinguished Scientists(No.BK2010006)Joint Innovation Project for Production-Study-Research in Jiangsu Province(No.BY2012155) China
文摘A novel, bifunctional, hypercrosslinked, magnetic resin W2 was prepared using divinylbenzene (DVB) and glycidyl methacrylate (GMA) as comonomers in three steps (i.e., suspension polymerization, amination and post-crosslinking reactions). To evaluate the adsorption of natural organic matter (NOM) and organic micropollutants (OMPs) on the obtained resin W2, two magnetic resins W1 (the precursor of W2 before post-crosslinking) and W0 (the precursor of W1 before amination) were chosen for comparison. The results indicated that W2 would be a promising material for the removal of both NOM and OMPs from aquatic environments.