IEECAS OpenIR中国科学院地球环境研究所http://ir.ieecas.cn:802024-03-19T03:39:06Z2024-03-19T03:39:06ZA critical review on plasma-catalytic removal of VOCs: Catalyst development, process parameters and synergetic reaction mechanismChang, TianWang, YuWang, YaqiZhao, ZuotongShen, ZhenxingHuang, YuWang, ChuanyiChen, QingcaiMorent, RinoVeerapandian, Savita K. P.De Geyter, Nathaliehttp://ir.ieecas.cn:80/handle/361006/177382023-12-29T07:09:12Z2023-12-29T07:09:12Z题名: A critical review on plasma-catalytic removal of VOCs: Catalyst development, process parameters and synergetic reaction mechanism
作者: Chang, Tian; Wang, Yu; Wang, Yaqi; Zhao, Zuotong; Shen, Zhenxing; Huang, Yu; Wang, Chuanyi; Chen, Qingcai; Morent, Rino; Veerapandian, Savita K. P.; De Geyter, Nathalie
摘要: It is urgent to control the emission of volatile organic compounds (VOCs) due to their harmful effects on the environment and human health. A hybrid system integrating non-thermal-plasma and catalysis is regarded as one of the most promising technologies for VOCs removal due to their high VOCs removal efficiency, product selectivity and energy efficiency. This review systematically documents the main findings and improvements of VOCs removal using plasma-catalysis technology in recent 10 years. To better understand the fundamental relation between different aspects of this research field, this review mainly addresses the catalyst development, key influential factors, generation of by-products and reaction mechanism of VOCs decomposition in the plasma-catalysis process. Also, a comparison of the performance in various VOCs removal processes is provided. Particular emphasis is given to the importance of the selected catalyst and the synergy of plasma and catalyst in the VOCs removal in the hybrid system, which can be used as a reference point for future studies in this field.2023-12-29T07:09:12ZDetermination of the optimized late Pleistocene chronology of a lacustrine sedimentary core from the Heqing Basin by geomagnetic paleointensity and its paleoclimate significanceXu, XinwenQiang, XiaokeLi, XubinQiu, HaijunZhao, HuiFu, ChaofengYang, Ziyihttp://ir.ieecas.cn:80/handle/361006/177352023-12-29T07:09:10Z2023-12-29T07:09:10Z题名: Determination of the optimized late Pleistocene chronology of a lacustrine sedimentary core from the Heqing Basin by geomagnetic paleointensity and its paleoclimate significance
作者: Xu, Xinwen; Qiang, Xiaoke; Li, Xubin; Qiu, Haijun; Zhao, Hui; Fu, Chaofeng; Yang, Ziyi
摘要: Long and continuous lacustrine sedimentary sequences from SW China faithfully recorded the evolution of the Indian summer monsoon (ISM). However, the limited dating range (< 50 ka) of C-14 dating has restricted high resolution research on the last glacial cycle.We presented a relative paleointensity (RPI) record from a lacustrine sedimentary core from the Heqing Basin to optimize its AMS C-14 chronology. Detailed rock magnetic analyses indicated that SD and vortex state magnetite (and/or maghemite) was the dominant magnetic mineral of lacustrine sediments. Moderate variations in concentration-dependent (SIRM, ARM) and grain-size-dependent (ARM/SIRM) parameters satisfied the criteria for the RPI studies. Consequently, we determined the RPI by NRM20-40 mT/SIRM20-40 mT, where NRM20-40 mT denotes the NRM after demagnetization between 20 and 40 mT. Using 6 AMS C-14 dates younger than 40 ka BP as constraints, 7 age control points were determined by correlating the lows in the RPI record with those of the target paleointensity stacks PISO-1500. We established a reliable chronological framework of the upper 11.1 m of the HQ drill core by binomial fitting based on the 7 RPI age control points and the climatic transition termination II. The consistent variations in our RPI curve and other global target paleointensity curves indicated that the optimized chronology was reliable.In our optimized chronology, the visible precession cycle in ARM/SIRM indicated that the ISM was a direct response to solar insolation during the last glacial cycle. The strong ISM suggested by the high content of Mesic conifers and tropical and subtropical trees during MIS 3 shifted to MIS 5a. Thus, the "MIS 3 Mega-paleolake " hypothesis in China, which was mainly deduced by the C-14 age model, was challenged.2023-12-29T07:09:10ZHighly Selective Photocatalytic CO2 Methanation with Water Vapor on Single-Atom Platinum-Decorated Defective Carbon NitrideShi, XianjinHuang, YuBo, YananDuan, DelongWang, ZhenyuCao, JunjiZhu, GangqiangHo, WingkeiWang, LiqinHuang, TingtingXiong, Yujiehttp://ir.ieecas.cn:80/handle/361006/177322023-12-29T07:09:09Z2023-12-29T07:09:09Z题名: Highly Selective Photocatalytic CO2 Methanation with Water Vapor on Single-Atom Platinum-Decorated Defective Carbon Nitride
作者: Shi, Xianjin; Huang, Yu; Bo, Yanan; Duan, Delong; Wang, Zhenyu; Cao, Junji; Zhu, Gangqiang; Ho, Wingkei; Wang, Liqin; Huang, Tingting; Xiong, Yujie
摘要: Solar-driven CO2 methanation with water is an important route to simultaneously address carbon neutrality and produce fuels. It is challenging to achieve high selectivity in CO2 methanation due to competing reactions. Nonetheless, aspects of the catalyst design can be controlled with meaningful effects on the catalytic outcomes. We report highly selective CO2 methanation with water vapor using a photocatalyst that integrates polymeric carbon nitride (CN) with single Pt atoms. As revealed by experimental characterization and theoretical simulations, the widely explored Pt-CN catalyst is adapted for selective CO2 methanation with our rationally designed synthetic method. The synthesis creates defects in CN along with formation of hydroxyl groups proximal to the coordinated Pt atoms. The photocatalyst exhibits high activity and carbon selectivity (99 %) for CH4 production in photocatalytic CO2 reduction with pure water. This work provides atomic scale insight into the design of photocatalysts for selective CO2 methanation.2023-12-29T07:09:09ZDiurnal Variations of Isoprene, Monoterpenes, and Toluene Oxidation Products in Aerosols at a Rural Site of Guanzhong Plain, Northwest ChinaWang, XiaoqingGuo, XiaoDai, WentingLiu, SuixinShen, MinxiaLiu, YaliZhang, YifanCao, YueQi, WeiningLi, LuCao, JunjiLi, Jianjunhttp://ir.ieecas.cn:80/handle/361006/177292023-12-29T07:09:07Z2023-12-29T07:09:07Z题名: Diurnal Variations of Isoprene, Monoterpenes, and Toluene Oxidation Products in Aerosols at a Rural Site of Guanzhong Plain, Northwest China
作者: Wang, Xiaoqing; Guo, Xiao; Dai, Wenting; Liu, Suixin; Shen, Minxia; Liu, Yali; Zhang, Yifan; Cao, Yue; Qi, Weining; Li, Lu; Cao, Junji; Li, Jianjun
摘要: In this study, the characteristics and formation mechanism of summertime isoprene, monoterpene, and toluene-derived secondary organic aerosols (SOAs) were investigated in a rural area of Guanzhong Plain, Northwest China. The variations in key indicators of primary sources indicated a significant influence of biomass burning on PM2.5 during the observation period. The concentrations of total measured SOA tracers from isoprene, monoterpene, and toluene were 40.85 +/- 17.31, 24.27 +/- 7.50, and 10.61 +/- 0.33 ng/m(3), respectively. The average ratio of cis-pinonic and pinic acids to 3-Methyl-1,2,3-butanetricarboxylic acid (MBTCA)(P/M) were 0.45 and 0.85 by day and by night, respectively. The low ratio in the daytime was mainly due to the stronger photo-degradation and particle-to-gas distribution of semi-volatile cis-pinonic and pinic acids. The monoterpene SOA tracers were significantly correlated with levoglucosan at night (R-2 = 0.51, p < 0.01), as were toluene SOA tracers and levoglucosan (R-2 > 0.67, p < 0.01), indicating the significant contribution of biomass combustion to these SOAs. The mass concentration of isoprene-, monoterpenes-, and toluene-derived SOC was estimated by using the tracer yield method. The total calculated SOCs by day and by night were 0.25-0.71 (average: 0.46) and 0.26-0.78 (average: 0.42) mu gC/m(3), accounting for 3.35-10.58% and 3.87-13.51% of OC by day and by night, respectively.2023-12-29T07:09:07ZEfficient charge separation of a Z-scheme Bi5O7-delta I/CeO2-delta heterojunction with enhanced visible light photocatalytic activity for NO removalYao, ZiyiNie, JunliUl Hassan, QadeerLi, GuianLiao, JiabinZhang, WeibinZhu, LujunShi, XianjinRao, FeiChang, JunHuang, YuZhu, Gangqianghttp://ir.ieecas.cn:80/handle/361006/177262023-12-29T07:09:06Z2023-12-29T07:09:06Z题名: Efficient charge separation of a Z-scheme Bi5O7-delta I/CeO2-delta heterojunction with enhanced visible light photocatalytic activity for NO removal
作者: Yao, Ziyi; Nie, Junli; Ul Hassan, Qadeer; Li, Guian; Liao, Jiabin; Zhang, Weibin; Zhu, Lujun; Shi, Xianjin; Rao, Fei; Chang, Jun; Huang, Yu; Zhu, Gangqiang
摘要: In this work, a novel Z-scheme Bi5O7-delta I/CeO2-delta heterojunction photocatalyst was prepared by combining hydrothermal synthesis and thermal treatment methods. Oxygen vacancies were in situ generated on the surface of Bi5O7-delta I and CeO2-delta nanostructures. The existence of oxygen vacancies significantly improved the light absorption of CeO2-delta and inhibited the recombination of photogenerated carriers. Based on the photocatalytic activity, the as-prepared Bi5O7-delta I/CeO2-delta photocatalyst exhibited excellent photocatalytic NO removal performance under visible light irradiation. The results of the capture experiment and electron spin resonance (ESR) spectroscopy show that super oxygen radicals (O-2(-)) and hydroxyl radicals (OH) are the main active species in the overall photocatalytic reaction process. Density functional theory (DFT) calculations and ESR results demonstrate that a Z-scheme heterojunction is formed between Bi5O7-delta I and CeO2-delta. Compared with the traditional type-II heterojunction, the Z-scheme heterojunction exhibited more efficient charge separation and robust redox capacity in the photocatalytic reaction.2023-12-29T07:09:06ZUncertainty in the projected changes of Sahel summer rainfall under global warming in CMIP5 and CMIP6 multi-model ensemblesZhang, ZhiyuanLi, Genhttp://ir.ieecas.cn:80/handle/361006/177232023-12-29T07:09:05Z2023-12-29T07:09:05Z题名: Uncertainty in the projected changes of Sahel summer rainfall under global warming in CMIP5 and CMIP6 multi-model ensembles
作者: Zhang, Zhiyuan; Li, Gen
摘要: The Sahel summer rainfall is of great significance to the local social, economic, and cultural environment. In the context of a long Sahel megadrought in the last thirty years of the twentieth century, the future change of Sahel summer rainfall under global warming has aroused wide attention. Based on the historical simulations and high emission scenario experiments from 20 Coupled Model Intercomparison Project phase-5 (CMIP5) models and 22 CMIP6 models, this study investigates the future projections of Sahel summer rainfall under global warming. The results show that the multi-model ensemble (MME) mean projects a slight increase (1-2%/celcius) of summer rainfall over the Sahel in the future which seems to be due to the thermodynamic changes and opposed by the dynamic changes, but that the inter-model spread is due to the latter. We find that, in particular, the inter-model spreads in the extratropical northern and tropical Atlantic sea surface temperature (SST) changes are two important sources of the uncertainty in the Sahel summer rainfall projections via two different atmospheric teleconnection processes. On the one hand, a warmer northern Atlantic SST would induce an anomalous large-scale cyclone over North Africa and Europe, and the southern branch would strengthen the western African monsoonal circulation, leading to a wetter Sahel. On the other hand, a warmer tropical Atlantic SST would weaken the regional circulation, resulting in a drier Sahel. Our results suggest that an improved projection of the future Atlantic warming, especially the differential warming between the northern and tropical Atlantic, is a priority for the reliable future projection of Sahel summer rainfall.2023-12-29T07:09:05ZClimatic controls on travertine deposition in southern Tibet during the late QuaternaryWang, ZhijunYin, Jian-JunCheng, HaiNing, YoufengMeyer, Michael C.http://ir.ieecas.cn:80/handle/361006/177142023-12-29T06:56:15Z2023-12-29T06:56:15Z题名: Climatic controls on travertine deposition in southern Tibet during the late Quaternary
作者: Wang, Zhijun; Yin, Jian-Jun; Cheng, Hai; Ning, Youfeng; Meyer, Michael C.
摘要: Large volumes of travertine deposits are preserved at hydrothermal spring sites on the Tibetan Plateau (TP). Yet, most of these deposits are under-researched with respect to their diagenetic and depositional history and there is still very limited understanding of the tectonic and climatic influences on travertine precipitation in the arid high-altitude setting of Tibet. In this study, a detailed uranium-series dating campaign was carried out for the Qiusang travertine (similar to 4270 m above sea level), southern Tibet that has been previously dated back to 486 thousand years ago (ka). Based on 42 new Th-230/U ages, combined with geomorphological and sedimentological investigations, several travertine zones were identified and distinct travertine depositional phases constrained: 11.7-6.8 ka and similar to 13.4 ka (zone 1), 128-122 ka (zone 2),-193 ka (zone 3),similar to 292 ka and 324 ka (zone 4), > 317 ka (zone 5), ca. 415 to 470 ka (zone 6) and ca. 419 to 445 ka (zone 7). Comparison of these depositional phases with local and regional proxy records suggests that travertine accumulation at Qiusang occurred during main interglacials when monsoon precipitation peaked on the TP. This coincidence, together with a sensitive response of Tibetan hydrothermal spring activity to meteoric recharge, implies that climate controls the precipitation of large travertine volumes on orbital timescales on the plateau. We propose that (i) tectonic activity is of subor-dinate importance and influences travertine precipitation on the TP only episodically and on significantly shorter (i.e. centennial to millennial) timescales related to the recurrence rates of large earthquakes and that (ii) intensive monsoonal-driven groundwater recharge is required on top of tectonic activity for generating volu-metrically significant travertine accumulations. Because of the high precipitation rates typical for hydrothermal spring carbonates, we conclude that travertine deposits on the TP could be utilized as valuable high-resolution proxy records of peak monsoon conditions in the currently arid to semi-arid landscape.& nbsp;Furthermore, the Qiusang travertine zone 7 is terraced and the travertine layers adjusted to a paleo-riverbed elevation similar to 30 m above the current river, allowing us to constrain fluvial incision to-0.07 m/ka for the south -central sector of the TP since the Mid-Pleistocene. The abundant travertine occurrences in Tibet in combination with uranium-series dating can thus also provide detailed insights into earth surface dynamics and landscape evolution on the world highest plateau.2023-12-29T06:56:15ZPotential paleoceanographic application of cold-water bamboo coral in the South China SeaZeng, ZhiweiDang, HaowenHuang, EnqingMa, XiaolinHuang, XiangtongKong, LeYang, CeQu, XiaoliZhou, LipingJian, Zhiminhttp://ir.ieecas.cn:80/handle/361006/177112023-12-29T06:56:14Z2023-12-29T06:56:14Z题名: Potential paleoceanographic application of cold-water bamboo coral in the South China Sea
作者: Zeng, Zhiwei; Dang, Haowen; Huang, Enqing; Ma, Xiaolin; Huang, Xiangtong; Kong, Le; Yang, Ce; Qu, Xiaoli; Zhou, Liping; Jian, Zhimin2023-12-29T06:56:14ZHolocene climate and soil water balance in Baoji Region of Southern Loess PlateauChu, Chun-JieZhao, Jing-BoGuo, NanShao, Tian-JieMa, Yan-DongSu, MinZhu, Ya-Dihttp://ir.ieecas.cn:80/handle/361006/177082023-12-29T06:56:12Z2023-12-29T06:56:12Z题名: Holocene climate and soil water balance in Baoji Region of Southern Loess Plateau
作者: Chu, Chun-Jie; Zhao, Jing-Bo; Guo, Nan; Shao, Tian-Jie; Ma, Yan-Dong; Su, Min; Zhu, Ya-Di
摘要: In this paper, changes in the Holocene climate, soil water and soil resources in Southern Loess Plateau are studied based on field investigation, grain size and chemical analysis. The purpose is to reveal the impact of the Holocene environmental change on soil water and human activities. The study shows that the mid-Holocene paleosol S0 in Baoji Region had a CaCO3 content close to 0, was enriched with Fe2O3, Al2O3, was of homogenous dense silty microstructure containing red argillans and had moderate chemical weathering. This shows that the paleosol is luvisol. The mean annual precipitation was about 800 mm at that time. The late-Holocene loess had a high CaCO3 content, low Fe2O3 and Al2O3 content and of pore-developed crumb microstructure, indicating that the climate was cold and dry. The migration depth of CaCO3 and Sr in the mid-Holocene paleosol indicates that the distribution depth of gravity water in the soil at that time reached 1.8 m, and the water content in the soil above 1.8 m during the vegetation growing season was higher than 20%. This made it suitable for the development of forest vegetation. The migration depth of CaCO3 in the Holocene loess was small and the water content in the layers of loess during rainy season was generally lower than 12%; thus, it was not suitable for the development of forest vegetation. In the mid-Holocene soil, water intake was greater than water consumption and soil water was positive balance. Moreover, trace elements, organic matters, water holding capacity and water content in S0 were higher than those in the early-Holocene and late-Holocene loess, which facilitated agricultural production and human activities. In fact, it is also the primary reason that the mid-Holocene village sites are significantly larger in quantity and greater in scale than the early-Holocene and late-Holocene village sites.2023-12-29T06:56:12ZCenozoic Uplift of Tanggula Range and Tuouohe Basin, Northern Tibet: Insights of the Anisotropy of Magnetic SusceptibilityLi, LeyiChang, HongPares, Josep M.Bradak, BalazsZhang, ZekeQiang, XiaokeGuan, ChongQuan, Chunyanhttp://ir.ieecas.cn:80/handle/361006/177052023-12-29T06:56:11Z2023-12-29T06:56:11Z题名: Cenozoic Uplift of Tanggula Range and Tuouohe Basin, Northern Tibet: Insights of the Anisotropy of Magnetic Susceptibility
作者: Li, Leyi; Chang, Hong; Pares, Josep M.; Bradak, Balazs; Zhang, Zeke; Qiang, Xiaoke; Guan, Chong; Quan, Chunyan
摘要: The timing and intensity of deformation of the Tanggula Range and Tuotuohe Basin are in debatable but strengthening the research on them is necessary for better understanding the geodynamic models of the Tibet and the tectonic-climate connections during the Cenozoic. Here we present the anisotropy of magnetic susceptibility (AMS) records from the foreland Tuotuohe Basin to understand the tectonic uplift history of the Tanggula Range for the interval of similar to 37-19.7 Ma. Rock magnetic analyses indicate that the main magnetic carrier is paramagnetic and the minor is hematite. Thus, the AMS in the Tuotuohe Section (TS) can be used to track the tectonic strain related to tectonic processes. The distribution direction of the maximum principle susceptibility (K-max) is approximately NW-SE, which intersects at about 10 degrees with the strike of the strata and is nearly parallel to the Tanggula thrust fault system, whereas the minimum principle susceptibility (K-min) is oriented in the NE-SW direction with a girdle distribution. This is consistent with the sedimentary fabric imprinted by the NE-SW shortening direction, representing the earliest deformation stage. AMS data in the TS can be divided into two phases at 30 Ma. From similar to 37 to 30 Ma, the AMS parameters indicate an active tectonic strain and the Tanggula Range uplift induced by the India-Asia convergence, whereas between 30 and 19.7 Ma, the strain is weak compared with the earlier phase. Finally, the weak strain environment between 30 and 19.7 Ma indicated by the AMS indexes of the TS and the paleoelevation evidence from the Tuotuohe Basin all together suggest that an additional 1000-2000 m of surface uplift of the basin may have begun after 19.7 Ma.2023-12-29T06:56:11Z