采用液相还原法制备了以石墨为载体的负载型纳米铁,并以其为还原剂进行化学反硝化,考察了此种材料还原硝酸盐氮的特性。结果表明,负载型纳米铁在中性条件下能够快速将硝酸盐氮还原而去除;铁量相同而不同铁碳比的负载型纳米铁还原硝酸盐...采用液相还原法制备了以石墨为载体的负载型纳米铁,并以其为还原剂进行化学反硝化,考察了此种材料还原硝酸盐氮的特性。结果表明,负载型纳米铁在中性条件下能够快速将硝酸盐氮还原而去除;铁量相同而不同铁碳比的负载型纳米铁还原硝酸盐氮的速率有所不同;体系初始pH值越低则负载型纳米铁还原硝酸盐氮的速率越快,pH值为2时可在15 m in内将浓度为80mg/L的硝酸盐氮全部去除;体系中的溶解氧会与NO3-争夺电子,在pH值较低时NO3-的还原受溶解氧的影响较大;负载型纳米铁可构成微小原电池,在化学反硝化反应中Fe起主要作用,Fe2+对反应有促进作用。展开更多
对混凝-超滤工艺在线化学强化反冲洗(chemically enhanced blackwash,CEB)过程中产生的副产物进行了分析,建立和优化了高效液相色谱质谱法(HPLC-MS/MS)测定反冲洗副产物中卤乙酸的分析方法.方法采用Zobax Plus Eclipse C8色谱柱,流速0.3...对混凝-超滤工艺在线化学强化反冲洗(chemically enhanced blackwash,CEB)过程中产生的副产物进行了分析,建立和优化了高效液相色谱质谱法(HPLC-MS/MS)测定反冲洗副产物中卤乙酸的分析方法.方法采用Zobax Plus Eclipse C8色谱柱,流速0.3 m L/min,进样量10μL,R2均在99.9%以上,最小检出限为0.08μg/L.在此基础上监测了CEB后24 h卤乙酸浓度的变化规律.结果表明:CEB过程中有清洗副产物卤乙酸的生成,且随着膜过滤出水时间的延长,大部分卤乙酸浓度逐渐降低.其中三氯乙酸生成量最高;其次为三溴乙酸.另外二溴乙酸浓度随时间无明显变化;二氯乙酸、三溴乙酸、一氯一溴乙酸和一氯二溴乙酸分别会在16、17、18、19 h达到浓度动态平衡.展开更多
Electrocatalytic water splitting provides an efficient method for the production of hydrogen.In electrocatalytic water splitting,the oxygen evolution reaction(OER)involves a kinetically sluggish four-electron transfer...Electrocatalytic water splitting provides an efficient method for the production of hydrogen.In electrocatalytic water splitting,the oxygen evolution reaction(OER)involves a kinetically sluggish four-electron transfer process,which limits the efficiency of electrocatalytic water splitting.Therefore,it is urgent to develop highly active OER catalysts to accelerate reaction kinetics.Coupling single atoms and clusters in one system is an innovative approach for developing efficient catalysts that can synergistically optimize the adsorption and configuration of intermediates and improve catalytic activity.However,research in this area is still scarce.Herein,we constructed a heterogeneous single-atom cluster system by anchoring Ir single atoms and Co clusters on the surface of Ni(OH)_(2)nanosheets.Ir single atoms and Co clusters synergistically improved the catalytic activity toward the OER.Specifically,Co_(n)Ir_(1)/Ni(OH)_(2)required an overpotential of 255 mV at a current density of 10 mA·cm^(−2),which was 60 mV and 67 mV lower than those of Co_(n)/Ni(OH)_(2)and Ir1/Ni(OH)_(2),respectively.The turnover frequency of Co_(n)Ir_(1)/Ni(OH)_(2)was 0.49 s^(−1),which was 4.9 times greater than that of Co_(n)/Ni(OH)_(2)at an overpotential of 300 mV.展开更多
The realization of real-time thermal feedback for monitoring photothermal therapy(PTT)under near-infrared(NIR)light irradiation is of great interest and challenge for antitumor therapy.Herein,by assembling highly effi...The realization of real-time thermal feedback for monitoring photothermal therapy(PTT)under near-infrared(NIR)light irradiation is of great interest and challenge for antitumor therapy.Herein,by assembling highly efficient photothermal conversion gold nanorods and a temperature-responsive probe((E)-4-(4-(diethylamino)styryl)-1-methylpyridin-1-ium,PyS)within MOF-199,an intelligent nanoplatform(AMPP)was fabricated for simultaneous chemodynamic therapy and NIR light-induced temperature-feedback PTT.The fluorescence intensity and temperature of the PyS probe are linearly related due to the restriction of the rotation of the characteristic monomethine bridge.Moreover,the copper ions resulting from the degradation of MOF-199 in an acidic microenvironment can convert H_(2)O_(2)into•OH,resulting in tumor ablation through a Fenton-like reaction,and this process can be accelerated by increasing the temperature.This study establishes a feasible platform for fabricating highly sensitive temperature sensors for efficient temperature-feedback PTT.展开更多
文摘采用液相还原法制备了以石墨为载体的负载型纳米铁,并以其为还原剂进行化学反硝化,考察了此种材料还原硝酸盐氮的特性。结果表明,负载型纳米铁在中性条件下能够快速将硝酸盐氮还原而去除;铁量相同而不同铁碳比的负载型纳米铁还原硝酸盐氮的速率有所不同;体系初始pH值越低则负载型纳米铁还原硝酸盐氮的速率越快,pH值为2时可在15 m in内将浓度为80mg/L的硝酸盐氮全部去除;体系中的溶解氧会与NO3-争夺电子,在pH值较低时NO3-的还原受溶解氧的影响较大;负载型纳米铁可构成微小原电池,在化学反硝化反应中Fe起主要作用,Fe2+对反应有促进作用。
文摘对混凝-超滤工艺在线化学强化反冲洗(chemically enhanced blackwash,CEB)过程中产生的副产物进行了分析,建立和优化了高效液相色谱质谱法(HPLC-MS/MS)测定反冲洗副产物中卤乙酸的分析方法.方法采用Zobax Plus Eclipse C8色谱柱,流速0.3 m L/min,进样量10μL,R2均在99.9%以上,最小检出限为0.08μg/L.在此基础上监测了CEB后24 h卤乙酸浓度的变化规律.结果表明:CEB过程中有清洗副产物卤乙酸的生成,且随着膜过滤出水时间的延长,大部分卤乙酸浓度逐渐降低.其中三氯乙酸生成量最高;其次为三溴乙酸.另外二溴乙酸浓度随时间无明显变化;二氯乙酸、三溴乙酸、一氯一溴乙酸和一氯二溴乙酸分别会在16、17、18、19 h达到浓度动态平衡.
基金supported by the National Key Research and Development Program of China(2021YFA1500500,2019-YFA0405600)the CAS Project for Young Scientists in Basic Research(YSBR-051)+6 种基金the National Science Fund for Distinguished Young Scholars(21925204)the National Natural Science Foundation of China(22202192,U19A2015,22221003,22250007,22163002)the Collaborative Innovation Program of Hefei Science Center,CAS(2022HSCCIP004)the International Partnership,the DNL Cooperation Fund,CAS(DNL202003)the USTC Research Funds of the Double First-Class Initiative(YD9990002016,YD999000-2014)the Program of Chinese Academy of Sciences(123GJHZ2022101GC)the Fundamental Research Funds for the Central Universities(WK9990000095,WK999000-0124).
文摘Electrocatalytic water splitting provides an efficient method for the production of hydrogen.In electrocatalytic water splitting,the oxygen evolution reaction(OER)involves a kinetically sluggish four-electron transfer process,which limits the efficiency of electrocatalytic water splitting.Therefore,it is urgent to develop highly active OER catalysts to accelerate reaction kinetics.Coupling single atoms and clusters in one system is an innovative approach for developing efficient catalysts that can synergistically optimize the adsorption and configuration of intermediates and improve catalytic activity.However,research in this area is still scarce.Herein,we constructed a heterogeneous single-atom cluster system by anchoring Ir single atoms and Co clusters on the surface of Ni(OH)_(2)nanosheets.Ir single atoms and Co clusters synergistically improved the catalytic activity toward the OER.Specifically,Co_(n)Ir_(1)/Ni(OH)_(2)required an overpotential of 255 mV at a current density of 10 mA·cm^(−2),which was 60 mV and 67 mV lower than those of Co_(n)/Ni(OH)_(2)and Ir1/Ni(OH)_(2),respectively.The turnover frequency of Co_(n)Ir_(1)/Ni(OH)_(2)was 0.49 s^(−1),which was 4.9 times greater than that of Co_(n)/Ni(OH)_(2)at an overpotential of 300 mV.
基金supported by the National Natural Science Foundation of China(22171001,22305001,51972001,52372073)the Natural Science Foundation of Anhui Province of China(2108085MB49).
文摘The realization of real-time thermal feedback for monitoring photothermal therapy(PTT)under near-infrared(NIR)light irradiation is of great interest and challenge for antitumor therapy.Herein,by assembling highly efficient photothermal conversion gold nanorods and a temperature-responsive probe((E)-4-(4-(diethylamino)styryl)-1-methylpyridin-1-ium,PyS)within MOF-199,an intelligent nanoplatform(AMPP)was fabricated for simultaneous chemodynamic therapy and NIR light-induced temperature-feedback PTT.The fluorescence intensity and temperature of the PyS probe are linearly related due to the restriction of the rotation of the characteristic monomethine bridge.Moreover,the copper ions resulting from the degradation of MOF-199 in an acidic microenvironment can convert H_(2)O_(2)into•OH,resulting in tumor ablation through a Fenton-like reaction,and this process can be accelerated by increasing the temperature.This study establishes a feasible platform for fabricating highly sensitive temperature sensors for efficient temperature-feedback PTT.
