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
By the suspended condensation reaction of poly(choloromethylthiirane)with o-tolidine and o- dianisidine respectively, two newmicrobeads chelating resins were synthesized by usingγ-Fe_2O_3 asmagnetic core. Their adsor...By the suspended condensation reaction of poly(choloromethylthiirane)with o-tolidine and o- dianisidine respectively, two newmicrobeads chelating resins were synthesized by usingγ-Fe_2O_3 asmagnetic core. Their adsorption properties for Hg(Ⅱ), Cu(Ⅱ), Zn(Ⅱ), Pb(Ⅱ), Au(Ⅲ), Pd(Ⅱ), Pt (Ⅳ)and Ag(Ⅰ)were investigated. Themicrobeads posses excellent adsorbability for Hg(Ⅱ) and noble metalions, and predominantly adsorbed Pd(Ⅱ)or Hg(Ⅱ)in the coexistence ofCu(Ⅱ), Zn(Ⅱ)and Mg(Ⅱ).展开更多
Magnetic polyethyleneimine chelating resin (PEI2) wasprepared. Its average diameter was 0. 44mm and it contained magnetic particles over 11% of the microcapsules after it had been treated with 8% hot HC1. The results ...Magnetic polyethyleneimine chelating resin (PEI2) wasprepared. Its average diameter was 0. 44mm and it contained magnetic particles over 11% of the microcapsules after it had been treated with 8% hot HC1. The results showed that the reaction media had significant effect on physical forms, magnetic particles content and stability in acid of the microcapsules. PEF2 had very high adsorption capacity to Au3+ , Pd2+ and Hg2+ , and little one tmvards Mg2+, Pb2+ and Cu2+. It was discovered that PEI2 could reduce Au3+ into elemental gold.展开更多
Magnetic polythioether chelating resin (PSEZ) was pre-pared. Its average diameter was 0. 25mm and it contained magnetic parti-cles over 2,2% of the microcapsules after it had been treated with 2N hot HCl , and it ivou...Magnetic polythioether chelating resin (PSEZ) was pre-pared. Its average diameter was 0. 25mm and it contained magnetic parti-cles over 2,2% of the microcapsules after it had been treated with 2N hot HCl , and it ivould be destroyed in 5N hot HCl, The results showed that reaction medium had remarkable effect on physical forms of the microcap-sules. PSEZ had very high adsorption capacity to Au3+ and Hg2+, and little one towards Mg2+ , Pb2+. It was discovered that PSEZ could reduce Au3+ into elemental gold and Pti+to Pb2+.展开更多
The development of projection-based stereolithography additive manufacturing techniques and magnetic photosensitive resins has provided a powerful approach to fabricate miniaturized magnetic functional devices with co...The development of projection-based stereolithography additive manufacturing techniques and magnetic photosensitive resins has provided a powerful approach to fabricate miniaturized magnetic functional devices with complex three-dimensional spatial structures.However,the present magnetic photosensitive resins face great challenges in the trade-off between high ferromagnetism and excellent printing quality.To address these challenges,we develop a novel NdFeB-Fe_(3)O_(4) magnetic photosensitive resin comprising 20 wt.%solid loading of magnetic particles,which can be used to fabricate high-precision and ferromagnetic functional devices via micro-continuous liquid interface production process.This resin combining ferromagnetic NdFeB microparticles and strongly absorbing Fe_(3)O_(4) nanoparticles is able to provide ferromagnetic capabilities and excellent printing quality simultaneously compared to both existing soft and hard magnetic photosensitive resins.The established penetration depth model reveals the effect of particle size,solid loading,and absorbance on the curing characteristics of magnetic photosensitive resin.A high-precision forming and ferromagnetic capability of the NdFeB-Fe_(3)O_(4) magnetic photosensitive resin are comprehensively demonstrated.It is found that the photosensitive resin(NdFeB:Fe_(3)O_(4)=1:1)can print samples with sub-40μm fine features,reduced by 87%compared to existing hard magnetic photosensitive resin,and exhibits significantly enhanced coercivity and remanence in comparison with existing soft magnetic photosensitive resins,showing by an increase of 24 times and 6 times,respectively.The reported NdFeB-Fe_(3)O_(4) magnetic photosensitive resin is anticipated to provide a new functional material for the design and manufacture of next-generation micro-robotics,electromagnetic sensor,and magneto-thermal devices.展开更多
A novel magnetic weak acid resin NDMC-1 was prepared in the presence of methyl acrylate (MA), divinylbenzene (DVB) and titanate coupling agent (TCA) coated γ-Fe203 particles. To evaluate the adsorption of Cu^2...A novel magnetic weak acid resin NDMC-1 was prepared in the presence of methyl acrylate (MA), divinylbenzene (DVB) and titanate coupling agent (TCA) coated γ-Fe203 particles. To evaluate the adsorption of Cu^2+ on the obtained resin NDMC- 1, another two magnetic resins NDMC-0 (the precursor of NDMC-1 without hydrolyzation) and NDMO-1 (the synthesized weak acid resin using oleic acid coated γ-Fe2O3) were chosen for comparison. The results showed that the carboxyl groups were formed after hydrolyzation, and NDMC-1 exhibited a greater adsorption capacity to Cu2~. The desorption experiment demonstrated that the desorption ratio at pH 2 (95.14%) was greatly higher than pH 3 (25.97%). Moreover, the magnetic resin NDMC-1 was proved to be stable at pH 2, extending the application of magnetic materials which were always considered to be acid-nor, resistant.展开更多
Magnetic anion exchange resin (MD-1) was prepared from quaternization of magnetic copolymeric resin (glycidyl methacry- late-co-divinylbenzene). For comparison, magnetic resin MD-0 without quaternization and non-m...Magnetic anion exchange resin (MD-1) was prepared from quaternization of magnetic copolymeric resin (glycidyl methacry- late-co-divinylbenzene). For comparison, magnetic resin MD-0 without quaternization and non-magnetic resin (D-l) were also synthesized for the adsorption process. It was found that the adsorption was mainly contributed to the chemical interaction between quaternary ammonium groups and reactive blue RXHC. Due to the smaller size, MD- 1 had faster adsorption and desorption kinetics than D-1. Coupled with the advantage of easy separation, the magnetic anion exchange resin was considered to be superior to common anion exchange resin in removal of reactive dye.展开更多
This study investigated the removal of dissolved organic matter(DOM) from real dyeing bio-treatment effluents(DBEs) with the use of a novel magnetic anion exchange resin(NDMP).DOMs in two typical DBEs were fract...This study investigated the removal of dissolved organic matter(DOM) from real dyeing bio-treatment effluents(DBEs) with the use of a novel magnetic anion exchange resin(NDMP).DOMs in two typical DBEs were fractionized using DAX-8/XAD-4 resin and ultrafiltration membranes. The hydrophilic fractions and the low molecular weight(MW)(〈3 kDa) DOM fractions constituted a major portion(〉50%) of DOMs for the two effluents. The hydrophilic and low MW fractions of both effluents were the greatest contributors of specific UV254absorbance(SUVA254),and the SUVA254 of DOM fractions decreased with hydrophobicity and MW. Two DBEs exhibited acute and chronic biotoxicities. Both acute and chronic toxicities of DOM fractions increased linearly with the increase of SUVA254 value. Kinetics of dissolved organic carbon(DOC) removal via NDMP treatment was performed by comparing it with that of particle active carbon(PAC). Results indicated that the removal of DOC from DBEs via NDMP was 60%,whereas DOC removals by PAC were lower than 15%. Acidic organics could be significantly removed with the use of NDMP. DOM with large MW in DBE could be removed significantly by using the same means. Removal efficiency of NDMP for DOM decreased with the decrease of MW. Compared with PAC,NDMP could significantly reduce the acute and chronic bio-toxicities of DBEs. NaCl/NaOH mixture regenerants,with selected concentrations of 10% NaCl(m/m)/1%NaOH(m/m),could improve desorption efficiency.展开更多
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
The source water in one forest region of the Northeast China had very high natural organic matter(NOM) concentration and heavy color during snowmelt period. The efficiency of five combined treatment processes was co...The source water in one forest region of the Northeast China had very high natural organic matter(NOM) concentration and heavy color during snowmelt period. The efficiency of five combined treatment processes was compared to address the high concentration of NOM and the mechanisms were also analyzed. Conventional treatment can hardly remove dissolved organic carbon(DOC) in the source water. KMn O4pre-oxidization could improve the DOC removal to 22.0%. Post activated carbon adsorption improved the DOC removal of conventional treatment to 28.8%. The non-sufficient NOM removal could be attributed to the dominance of large molecular weight organic matters in raw water, which cannot be adsorbed by the micropore upon activated carbon. O3+ activated carbon treatment are another available technology for eliminating the color and UV254 in water. However, its performance of DOC removal was only 36.4%, which could not satisfy the requirement for organic matter. The limited ozone dosage is not sufficient to mineralize the high concentration of NOM. Magnetic ion-exchange resin combined with conventional treatment could remove 96.2%of color, 96.0% of UV254 and 87.1% of DOC, enabling effluents to meet the drinking water quality standard. The high removal efficiency could be explained by the negative charge on the surface of NOM which benefits the static adsorption of NOM on the anion exchange resin. The results indicated that magnetic ion-exchange resin combined with conventional treatment is the best available technology to remove high concentration of NOM.展开更多
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.
基金Funded by Natural Science Foundation of Hubei Province (NO.2000J022)
文摘By the suspended condensation reaction of poly(choloromethylthiirane)with o-tolidine and o- dianisidine respectively, two newmicrobeads chelating resins were synthesized by usingγ-Fe_2O_3 asmagnetic core. Their adsorption properties for Hg(Ⅱ), Cu(Ⅱ), Zn(Ⅱ), Pb(Ⅱ), Au(Ⅲ), Pd(Ⅱ), Pt (Ⅳ)and Ag(Ⅰ)were investigated. Themicrobeads posses excellent adsorbability for Hg(Ⅱ) and noble metalions, and predominantly adsorbed Pd(Ⅱ)or Hg(Ⅱ)in the coexistence ofCu(Ⅱ), Zn(Ⅱ)and Mg(Ⅱ).
文摘Magnetic polyethyleneimine chelating resin (PEI2) wasprepared. Its average diameter was 0. 44mm and it contained magnetic particles over 11% of the microcapsules after it had been treated with 8% hot HC1. The results showed that the reaction media had significant effect on physical forms, magnetic particles content and stability in acid of the microcapsules. PEF2 had very high adsorption capacity to Au3+ , Pd2+ and Hg2+ , and little one tmvards Mg2+, Pb2+ and Cu2+. It was discovered that PEI2 could reduce Au3+ into elemental gold.
文摘Magnetic polythioether chelating resin (PSEZ) was pre-pared. Its average diameter was 0. 25mm and it contained magnetic parti-cles over 2,2% of the microcapsules after it had been treated with 2N hot HCl , and it ivould be destroyed in 5N hot HCl, The results showed that reaction medium had remarkable effect on physical forms of the microcap-sules. PSEZ had very high adsorption capacity to Au3+ and Hg2+, and little one towards Mg2+ , Pb2+. It was discovered that PSEZ could reduce Au3+ into elemental gold and Pti+to Pb2+.
基金supported by the National Key Research and Development Program of China(Grant Number2022YFB460001602)National Natural Science Foundation of China(Grant Numbers 52125505,U20A20297)the Key-area Research and Development Program of Guangdong Province(Grant Number 2020B090923003)。
文摘The development of projection-based stereolithography additive manufacturing techniques and magnetic photosensitive resins has provided a powerful approach to fabricate miniaturized magnetic functional devices with complex three-dimensional spatial structures.However,the present magnetic photosensitive resins face great challenges in the trade-off between high ferromagnetism and excellent printing quality.To address these challenges,we develop a novel NdFeB-Fe_(3)O_(4) magnetic photosensitive resin comprising 20 wt.%solid loading of magnetic particles,which can be used to fabricate high-precision and ferromagnetic functional devices via micro-continuous liquid interface production process.This resin combining ferromagnetic NdFeB microparticles and strongly absorbing Fe_(3)O_(4) nanoparticles is able to provide ferromagnetic capabilities and excellent printing quality simultaneously compared to both existing soft and hard magnetic photosensitive resins.The established penetration depth model reveals the effect of particle size,solid loading,and absorbance on the curing characteristics of magnetic photosensitive resin.A high-precision forming and ferromagnetic capability of the NdFeB-Fe_(3)O_(4) magnetic photosensitive resin are comprehensively demonstrated.It is found that the photosensitive resin(NdFeB:Fe_(3)O_(4)=1:1)can print samples with sub-40μm fine features,reduced by 87%compared to existing hard magnetic photosensitive resin,and exhibits significantly enhanced coercivity and remanence in comparison with existing soft magnetic photosensitive resins,showing by an increase of 24 times and 6 times,respectively.The reported NdFeB-Fe_(3)O_(4) magnetic photosensitive resin is anticipated to provide a new functional material for the design and manufacture of next-generation micro-robotics,electromagnetic sensor,and magneto-thermal devices.
基金support provided by Program for Changjiang Scholars,NSFC(Nos. 51178215 and 51208249)Jiangsu Nature Science Fund(Nos.BK2010006 and BK2011032)Joint Innovation Project for Production-Study-Research in Jiangsu Province(No.BY2012155) China
文摘A novel magnetic weak acid resin NDMC-1 was prepared in the presence of methyl acrylate (MA), divinylbenzene (DVB) and titanate coupling agent (TCA) coated γ-Fe203 particles. To evaluate the adsorption of Cu^2+ on the obtained resin NDMC- 1, another two magnetic resins NDMC-0 (the precursor of NDMC-1 without hydrolyzation) and NDMO-1 (the synthesized weak acid resin using oleic acid coated γ-Fe2O3) were chosen for comparison. The results showed that the carboxyl groups were formed after hydrolyzation, and NDMC-1 exhibited a greater adsorption capacity to Cu2~. The desorption experiment demonstrated that the desorption ratio at pH 2 (95.14%) was greatly higher than pH 3 (25.97%). Moreover, the magnetic resin NDMC-1 was proved to be stable at pH 2, extending the application of magnetic materials which were always considered to be acid-nor, resistant.
基金support provided by the State Key Program of National Natural Science(No.50938004)the National Nature Science Fund for Distinguished Young Scientists(No.50825802)+1 种基金Jiangsu Nature Science Fund(No.BK2010006)the Resources Key Subject of National High Technology Research & Development Project(No.2009AA06Z315 and SQ2009AA06XK1482331),China
文摘Magnetic anion exchange resin (MD-1) was prepared from quaternization of magnetic copolymeric resin (glycidyl methacry- late-co-divinylbenzene). For comparison, magnetic resin MD-0 without quaternization and non-magnetic resin (D-l) were also synthesized for the adsorption process. It was found that the adsorption was mainly contributed to the chemical interaction between quaternary ammonium groups and reactive blue RXHC. Due to the smaller size, MD- 1 had faster adsorption and desorption kinetics than D-1. Coupled with the advantage of easy separation, the magnetic anion exchange resin was considered to be superior to common anion exchange resin in removal of reactive dye.
基金supported by the Program for Changjiang Scholars and Innovative Research Team in University (Nos.51208249,51290282)Natural Science Foundation of China (Nos.51178215,51308283)+1 种基金the Jiangsu Nature Science Fund,China (Nos.BK2010006,BK2011032)the Joint Innovation Project for Production-Study-Research in Jiangsu Province,China (No.BY2013061)
文摘This study investigated the removal of dissolved organic matter(DOM) from real dyeing bio-treatment effluents(DBEs) with the use of a novel magnetic anion exchange resin(NDMP).DOMs in two typical DBEs were fractionized using DAX-8/XAD-4 resin and ultrafiltration membranes. The hydrophilic fractions and the low molecular weight(MW)(〈3 kDa) DOM fractions constituted a major portion(〉50%) of DOMs for the two effluents. The hydrophilic and low MW fractions of both effluents were the greatest contributors of specific UV254absorbance(SUVA254),and the SUVA254 of DOM fractions decreased with hydrophobicity and MW. Two DBEs exhibited acute and chronic biotoxicities. Both acute and chronic toxicities of DOM fractions increased linearly with the increase of SUVA254 value. Kinetics of dissolved organic carbon(DOC) removal via NDMP treatment was performed by comparing it with that of particle active carbon(PAC). Results indicated that the removal of DOC from DBEs via NDMP was 60%,whereas DOC removals by PAC were lower than 15%. Acidic organics could be significantly removed with the use of NDMP. DOM with large MW in DBE could be removed significantly by using the same means. Removal efficiency of NDMP for DOM decreased with the decrease of MW. Compared with PAC,NDMP could significantly reduce the acute and chronic bio-toxicities of DBEs. NaCl/NaOH mixture regenerants,with selected concentrations of 10% NaCl(m/m)/1%NaOH(m/m),could improve desorption efficiency.
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supported by the project of " Major Science and Technology Program for Water Pollution Control and Treatment of China " (No. 2008ZX07420-005)the Natural Science Foundation of China (No. 51290284)the Tsinghua University Initiative Scientific Research Program (No. 20131089247)
文摘The source water in one forest region of the Northeast China had very high natural organic matter(NOM) concentration and heavy color during snowmelt period. The efficiency of five combined treatment processes was compared to address the high concentration of NOM and the mechanisms were also analyzed. Conventional treatment can hardly remove dissolved organic carbon(DOC) in the source water. KMn O4pre-oxidization could improve the DOC removal to 22.0%. Post activated carbon adsorption improved the DOC removal of conventional treatment to 28.8%. The non-sufficient NOM removal could be attributed to the dominance of large molecular weight organic matters in raw water, which cannot be adsorbed by the micropore upon activated carbon. O3+ activated carbon treatment are another available technology for eliminating the color and UV254 in water. However, its performance of DOC removal was only 36.4%, which could not satisfy the requirement for organic matter. The limited ozone dosage is not sufficient to mineralize the high concentration of NOM. Magnetic ion-exchange resin combined with conventional treatment could remove 96.2%of color, 96.0% of UV254 and 87.1% of DOC, enabling effluents to meet the drinking water quality standard. The high removal efficiency could be explained by the negative charge on the surface of NOM which benefits the static adsorption of NOM on the anion exchange resin. The results indicated that magnetic ion-exchange resin combined with conventional treatment is the best available technology to remove high concentration of NOM.