为全面直观了解全球农田土壤重金属污染钝化修复研究进展和发展趋势,本文基于Web of Science(简称WoS)核心合集数据库利用WoS数据库自带分析工具、HistCite引文图谱分析软件和VOSviewer可视化分析软件,从发文量或被引频次TOP10的国家、...为全面直观了解全球农田土壤重金属污染钝化修复研究进展和发展趋势,本文基于Web of Science(简称WoS)核心合集数据库利用WoS数据库自带分析工具、HistCite引文图谱分析软件和VOSviewer可视化分析软件,从发文量或被引频次TOP10的国家、研究机构、作者、期刊、研究热点等方面对1990―2019年发表的农田土壤重金属污染钝化修复文献进行计量分析。结果表明,世界范围内农田土壤重金属钝化修复领域年度发文量呈逐渐增长的趋势,发文量前三的国家是中国、美国和西班牙,中国的发文量远超其他国家,占比28.79%;发文机构主要是中国科学院、西班牙高等科学研究委员会、中国科学院大学、佛罗里达大学和浙江大学等,其中中国科学院发文量和被引频次均为最高,在该领域具有显著的科研水平和影响力;主要期刊有Environmental Science and Pollution Research、Chemosphere、Science of the Total Environment和Journal of Hazardous Materials等;目前应用较多的钝化剂主要是污泥、生物质炭、赤泥、堆肥、磷酸盐、石灰、废弃物等,关注的重金属主要是镉、铅、铜、锌、砷等,主要侧重于重金属的生物有效性。展开更多
Four species of Sedum L. were grown in nutrient solution for the comparison of their Zn uptake and accumulation. S. alfredii Hance showed much greater tolerance to Zn than the other three species. Shoot and root yield...Four species of Sedum L. were grown in nutrient solution for the comparison of their Zn uptake and accumulation. S. alfredii Hance showed much greater tolerance to Zn than the other three species. Shoot and root yields of S. sarmentosum Bunge, S. bulbiferum Makino, and S. emarginatum Migo decreased with increasing Zn concentration in the solution, while shoot and root yields of S. alfredii increased when Zn concentration was ≤80 mg·L -1. At 80 mg·L -1 Zn, Zn concentration in shoots of S. alfredii reached 19.09 mg·g -1. S. alfredii was also more efficient in Zn translocation from roots to shoots, while Zn concentration in shoots was much higher than in roots. However, this was not the case for the other three species. The results showed that S. alfredii is a Zn hyperaccumulator and could be useful for the phytoremediation of Zn-contaminated soils.展开更多
In the present study,we synthesized CeO2 catalysts doped with various transition metals(M=Co,Fe,or Cu)using a supercritical water hydrothermal route,which led to the incorporation of the metal ions in the CeO2 lattice...In the present study,we synthesized CeO2 catalysts doped with various transition metals(M=Co,Fe,or Cu)using a supercritical water hydrothermal route,which led to the incorporation of the metal ions in the CeO2 lattice,forming solid solutions.The catalysts were then used for the selective catalytic reduction(SCR)of NO by CO.The Cu‐doped catalyst exhibited the highest SCR activity;it had a T50(i.e.,50%NO conversion)of only 83°C and a T90(i.e.,90%NO conversion)of 126°C.Such an activity was also higher than in many state‐of‐the‐art catalysts.In situ diffuse reflectance Fourier transform infrared spectroscopy suggested that the MOx‐CeO2 catalysts(M=Co and Fe)mainly followed an Eley‐Rideal reaction mechanism for CO‐SCR.In contrast,a Langmuir‐Hinshelwood SCR reaction mechanism occurred in CuO‐CeO2 owing to the presence of Cu+species,which ensured effective adsorption of CO.This explains why CuO‐CeO2 exhibited the highest activity with regard to the SCR of NO by CO.展开更多
In this study, a hybrid process using non‐thermal plasma (NTP) and photocatalytic oxidation (PCO) was adopted for the degradation of gas‐phase toluene using TiO2 as the photocatalyst. To discover the synergetic effe...In this study, a hybrid process using non‐thermal plasma (NTP) and photocatalytic oxidation (PCO) was adopted for the degradation of gas‐phase toluene using TiO2 as the photocatalyst. To discover the synergetic effect between NTP and PCO, the performances of both sole (O3, UV, NTP, and PCO) and combined (O3 + TiO2, O3 + UV, NTP + UV, O3 + PCO, and NTP + PCO) processes were investigated from different perspectives, such as the toluene removal efficiency, selectivity of COx, mineralization rate, ozone utilization, and the generation of by‐products. The toluene removal efficiency of the combined NTP + PCO process was 80.2%, which was much higher than that of a sole degradation process such as NTP (18.8%) and PCO (13.4%). The selectivity of CO2 and the ozone utilization efficiency also significantly improved. The amount of by‐products in the gas phase and the carbon‐ based intermediates adsorbed on the catalyst surface dramatically reduced. The improvement in the overall performances of the combined NTP + PCO process was mainly ascribed to the efficient utilization of ozone in the photocatalytic oxidation, and the ozone further acting as an electron acceptor and scavenger, generating more hydroxyl radicals and reducing the recombination of electron‐ hole pairs.展开更多
α‐,β‐,γ‐andδ‐MnO2catalysts were synthesized by a one‐step hydrothermal method,and were utilized for the catalytic oxidation of toluene in a combined plasma‐catalytic process.The relationship between catalyti...α‐,β‐,γ‐andδ‐MnO2catalysts were synthesized by a one‐step hydrothermal method,and were utilized for the catalytic oxidation of toluene in a combined plasma‐catalytic process.The relationship between catalytic performance and MnO2crystal structures was investigated.It was noted that the toluene removal efficiency was32.5%at the specific input energy of160J/L when non‐thermal plasma was used alone.Theα‐MnO2catalyst showed the best activity among the investigated catalysts,yielding a toluene conversion of78.1%at the specific input energy of160J/L.Forβ‐MnO2,γ‐MnO2andδ‐MnO2,removal efficiencies of47.4%,66.1%and50.0%,respectively,were achieved.By powder X‐ray diffraction,Raman spectroscopy,transmission electron microscopy,scanning electron microscopy,Brunauer‐Emmett‐Teller,H2temperature‐programmed reduction and X‐ray photoelectron spectroscopy analyses,it was concluded that the tunnel structure,the stability of the crystal in plasma,the Mn-O bond strength of MnO2and the surface‐chemisorbed oxygen species played important roles in the plasma‐catalytic degradation of toluene.Additionally,the degradation routes of toluene in non‐thermal plasma and in the plasma‐catalytic process were also studied.It was concluded that the introduction of MnO2catalysts enabled O3,O2,electrons and radical species in the gas to be adsorbed on the MnO2surface via a facile interconversion among the Mn4+,Mn3+and Mn2+states.These four species could then be transported to the toluene or intermediate organic by‐products,which greatly improved the toluene removal efficiency and decreased the final output of by‐products.展开更多
A sample of sulfated anatase TiO2 with high‐energy(001)facets(TiO2‐001)was prepared by a simple one‐step hydrothermal route using SO42-as a morphology‐controlling agent.After doping ceria,Ce/TiO2‐001 was used as ...A sample of sulfated anatase TiO2 with high‐energy(001)facets(TiO2‐001)was prepared by a simple one‐step hydrothermal route using SO42-as a morphology‐controlling agent.After doping ceria,Ce/TiO2‐001 was used as the catalyst for selective catalytic reduction(SCR)of NO with NH3.Compared with Ce/P25(Degussa P25 TiO2)and Ce/P25‐S(sulfated P25)catalysts,Ce/TiO2‐001 was more suitable for medium‐and high‐temperature SCR of NO due to the high surface area,sulfation,and the excellent properties of the active‐energy(001)facets.All of these facilitated the generation of abundant acidity,chemisorbed oxygen,and activated NOx‐adsorption species,which were the important factors for the SCR reaction.展开更多
文摘为全面直观了解全球农田土壤重金属污染钝化修复研究进展和发展趋势,本文基于Web of Science(简称WoS)核心合集数据库利用WoS数据库自带分析工具、HistCite引文图谱分析软件和VOSviewer可视化分析软件,从发文量或被引频次TOP10的国家、研究机构、作者、期刊、研究热点等方面对1990―2019年发表的农田土壤重金属污染钝化修复文献进行计量分析。结果表明,世界范围内农田土壤重金属钝化修复领域年度发文量呈逐渐增长的趋势,发文量前三的国家是中国、美国和西班牙,中国的发文量远超其他国家,占比28.79%;发文机构主要是中国科学院、西班牙高等科学研究委员会、中国科学院大学、佛罗里达大学和浙江大学等,其中中国科学院发文量和被引频次均为最高,在该领域具有显著的科研水平和影响力;主要期刊有Environmental Science and Pollution Research、Chemosphere、Science of the Total Environment和Journal of Hazardous Materials等;目前应用较多的钝化剂主要是污泥、生物质炭、赤泥、堆肥、磷酸盐、石灰、废弃物等,关注的重金属主要是镉、铅、铜、锌、砷等,主要侧重于重金属的生物有效性。
文摘Four species of Sedum L. were grown in nutrient solution for the comparison of their Zn uptake and accumulation. S. alfredii Hance showed much greater tolerance to Zn than the other three species. Shoot and root yields of S. sarmentosum Bunge, S. bulbiferum Makino, and S. emarginatum Migo decreased with increasing Zn concentration in the solution, while shoot and root yields of S. alfredii increased when Zn concentration was ≤80 mg·L -1. At 80 mg·L -1 Zn, Zn concentration in shoots of S. alfredii reached 19.09 mg·g -1. S. alfredii was also more efficient in Zn translocation from roots to shoots, while Zn concentration in shoots was much higher than in roots. However, this was not the case for the other three species. The results showed that S. alfredii is a Zn hyperaccumulator and could be useful for the phytoremediation of Zn-contaminated soils.
文摘In the present study,we synthesized CeO2 catalysts doped with various transition metals(M=Co,Fe,or Cu)using a supercritical water hydrothermal route,which led to the incorporation of the metal ions in the CeO2 lattice,forming solid solutions.The catalysts were then used for the selective catalytic reduction(SCR)of NO by CO.The Cu‐doped catalyst exhibited the highest SCR activity;it had a T50(i.e.,50%NO conversion)of only 83°C and a T90(i.e.,90%NO conversion)of 126°C.Such an activity was also higher than in many state‐of‐the‐art catalysts.In situ diffuse reflectance Fourier transform infrared spectroscopy suggested that the MOx‐CeO2 catalysts(M=Co and Fe)mainly followed an Eley‐Rideal reaction mechanism for CO‐SCR.In contrast,a Langmuir‐Hinshelwood SCR reaction mechanism occurred in CuO‐CeO2 owing to the presence of Cu+species,which ensured effective adsorption of CO.This explains why CuO‐CeO2 exhibited the highest activity with regard to the SCR of NO by CO.
基金supported by the National Key Research and Development Plan of China (2016YFC0204700)National Natural Science Foundation of China (NSFC-51578488)+3 种基金Zhejiang Provincial "151" Talents Program (2013)Key Project of Zhejiang Provincial Science and Technology Programthe Program for Zhejiang Leading Team of S&T Innovation (2013TD07)the Changjiang Scholar Incentive Program (2009)~~
文摘In this study, a hybrid process using non‐thermal plasma (NTP) and photocatalytic oxidation (PCO) was adopted for the degradation of gas‐phase toluene using TiO2 as the photocatalyst. To discover the synergetic effect between NTP and PCO, the performances of both sole (O3, UV, NTP, and PCO) and combined (O3 + TiO2, O3 + UV, NTP + UV, O3 + PCO, and NTP + PCO) processes were investigated from different perspectives, such as the toluene removal efficiency, selectivity of COx, mineralization rate, ozone utilization, and the generation of by‐products. The toluene removal efficiency of the combined NTP + PCO process was 80.2%, which was much higher than that of a sole degradation process such as NTP (18.8%) and PCO (13.4%). The selectivity of CO2 and the ozone utilization efficiency also significantly improved. The amount of by‐products in the gas phase and the carbon‐ based intermediates adsorbed on the catalyst surface dramatically reduced. The improvement in the overall performances of the combined NTP + PCO process was mainly ascribed to the efficient utilization of ozone in the photocatalytic oxidation, and the ozone further acting as an electron acceptor and scavenger, generating more hydroxyl radicals and reducing the recombination of electron‐ hole pairs.
基金supported by the National Key Research and Development Plan of China(2016YFC0204700)Zhejiang Provincial"151"Talents Program(2013)+2 种基金Key Project of Zhejiang Provincial Science and Technology Program,the Program for Zhejiang Leading Team of S&T Innovation(2013TD07)Special Program for Social Development of Key Science and Technology Project of Zhejiang Province(2014C03025)Changjiang Scholar Incentive Program(2009)~~
文摘α‐,β‐,γ‐andδ‐MnO2catalysts were synthesized by a one‐step hydrothermal method,and were utilized for the catalytic oxidation of toluene in a combined plasma‐catalytic process.The relationship between catalytic performance and MnO2crystal structures was investigated.It was noted that the toluene removal efficiency was32.5%at the specific input energy of160J/L when non‐thermal plasma was used alone.Theα‐MnO2catalyst showed the best activity among the investigated catalysts,yielding a toluene conversion of78.1%at the specific input energy of160J/L.Forβ‐MnO2,γ‐MnO2andδ‐MnO2,removal efficiencies of47.4%,66.1%and50.0%,respectively,were achieved.By powder X‐ray diffraction,Raman spectroscopy,transmission electron microscopy,scanning electron microscopy,Brunauer‐Emmett‐Teller,H2temperature‐programmed reduction and X‐ray photoelectron spectroscopy analyses,it was concluded that the tunnel structure,the stability of the crystal in plasma,the Mn-O bond strength of MnO2and the surface‐chemisorbed oxygen species played important roles in the plasma‐catalytic degradation of toluene.Additionally,the degradation routes of toluene in non‐thermal plasma and in the plasma‐catalytic process were also studied.It was concluded that the introduction of MnO2catalysts enabled O3,O2,electrons and radical species in the gas to be adsorbed on the MnO2surface via a facile interconversion among the Mn4+,Mn3+and Mn2+states.These four species could then be transported to the toluene or intermediate organic by‐products,which greatly improved the toluene removal efficiency and decreased the final output of by‐products.
基金supported by the National Key R&D Program of China(2016YFC0204100)the Zhejiang Provincial "151" Talents Program+1 种基金the Program for Zhejiang Leading Team of S&T Innovation(2013TD07)the Changjiang Scholar Incentive Program(2009)~~
文摘A sample of sulfated anatase TiO2 with high‐energy(001)facets(TiO2‐001)was prepared by a simple one‐step hydrothermal route using SO42-as a morphology‐controlling agent.After doping ceria,Ce/TiO2‐001 was used as the catalyst for selective catalytic reduction(SCR)of NO with NH3.Compared with Ce/P25(Degussa P25 TiO2)and Ce/P25‐S(sulfated P25)catalysts,Ce/TiO2‐001 was more suitable for medium‐and high‐temperature SCR of NO due to the high surface area,sulfation,and the excellent properties of the active‐energy(001)facets.All of these facilitated the generation of abundant acidity,chemisorbed oxygen,and activated NOx‐adsorption species,which were the important factors for the SCR reaction.
