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Mechanistic insight into Cr(Ⅵ)retention by Si-containing ferrihydrite

Journal of environmental Sciences 2024年第5期139卷 217-225页

作者： Ying Hu Qiang Xue Honghan Chen Huaming Guo Kenneth C.Carroll Song Wang MOE key laboratory of Groundwater Circulation and environmental Evolution School of Water Resources and EnvironmentChina University of Geosciences(Beijing)Beijing 100083China Beijing key laboratory of Water Resources and environmental Engineering School of Water Resources and EnvironmentChina University of GeosciencesBeijing 100083China State key laboratory of biogeology and environmental geology China University of GeosciencesBeijing 100083China Plant&environmental Science New Mexico State UniversityNM 88003USA Institute of Theoretical Chemistry College of ChemistryJilin UniversityChangchun 130023China

Hexavalent chromium[Cr(Ⅵ)]causes serious harm to the environment due to its high toxicity,solubility,and ***(Fh)are the main adsorbent and trapping agent of Cr(Ⅵ)in soils and aquifers,and they usually coexist with silicate(Si),forming Si-containing ferrihydrite(Si-Fh)***,the mechanism of Cr(Ⅵ)retention by Si-Fh mixtures is poorly *** this study,the behaviors and mechanisms of Cr(Ⅵ)adsorption onto Si-Fh with different Si/Fe molar ratios was *** electron microscope,Fourier transform infrared spectroscopy,X-ray diffraction,X-ray photoelectron spectroscopy,and other techniques were used to characterize Si-Fh and Cr(Ⅵ)-loading of *** results show that specific surface area of Si-Fh increases gradually with increasing Si/Fe ratios,but Cr(Ⅵ)adsorption on Si-Fh decreases with increasing Si/Fe *** is because with an increase in Si/Fe molar ratio,the point of zero charge of Si-Fh gradually decreases and electrostatic repulsion between Si-Fh and Cr(Ⅵ)***,the complexation of Cr(Ⅵ)is enhanced due to the increase in adsorbed hydroxyl(A-OH-)on Si-Fh with increasing Si/Fe molar ratio,which partly counteracts the effect of the electrostatic ***,the increase in the electrostatic repulsion has a greater impact on adsorption than the additional complexation with *** functional theory calculation further supports this observation,showing the increases in electron variation of bonding atoms and reaction energies of inner spherical complexes with the increase in Si/Fe ratio.

关键词： Hexavalent chromium Ferrihydrite Si/Fe ratio Cr(Ⅵ)Adsorption

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A Review on Nanomaterial-based Strategies for Manipulating Tumor Microenvironment to Enhance Chemodynamic Therapy

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Chemical Research in Chinese Universities 2024年第2期40卷 202-212页

作者： CAO Mengyu XING Xiner SHEN Xiaotong OUYANG Jin NA Na key laboratory of Radiopharmaceuticals Ministry of EducationCollege of ChemistryBeijing Normal UniversityBeijing100875P.R.China Department of Chemistry College of Arts and SciencesBeijing Normal University at ZhuhaiZhuhai519087P.R.China State key laboratory of biogeology and environmental geology China University of GeosciencesWuhan430074P.R.China

Cancer is a leading cause of death worldwide,and a series of strategies has been reported for tumor-specific ***,chemodynamic therapy(CDT)has become a research hotspot for antitumor treatment due to its advantages of high specificity,endogenous stimulation,and high ***,the therapeutic effects of CDT are normally limited in the complex tumor microenvironment(TME),such as insufficient acidity,tumor hypoxia,low hydrogen peroxide(H2O2),and high glutathione(GSH).Consequently,different kinds of multifunctional nanomaterials have been designed to manipulate TME conditions,which provided more opportunities to improve the efficiency of *** review focuses on nanomaterial-based strategies for enhancing CDT through manipulating *** CDT enhancements,this review would provide a reference for the future development of efficient CDT nanomaterials.

关键词： Chemodynamic therapy Tumor microenvironment Nanomaterial Manipulating strategy Fenton/Fenton-like reaction

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GeoChip-based microbial functions in biogeochemical cycles and their responses to environmental factors in Tengchong hot springs

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Journal of Earth Science 2024年

作者： Muhammad Inayat Ullah Khan Liuqin Huang Geng Wu Jian Yang Xiangyu Guan Hongchen Jiang School of environmental Studies， china university of geosciences School of Ocean Sciences， china university of geosciences Beijing State key laboratory of biogeology and environmental geology， china university of geosciences

Microorganisms actively participate in biogeochemical cycling processes and play a crucial role in maintaining the dynamic balance of hot spring ecosystems. However， the distribution of microbial functional genes and their influencing factors in hot springs remain largely unclear. Therefore， this study investigated the microbial functional genes and their potential for controlling biogeochemical cycles (C， N， S， and P) in the hot Springs of Tengchong， china， using the Geochip method， a functional gene microarray technology. The examined hot springs have very different microbial functional genes. A total of 22736 gene probe signals were identified， belonging to 567 functional genes and associated with 15 ecological functions， mainly involving stress response， carbon cycle， nitrogen cycle， sulfur cycle， phosphorus cycle and energy processes. The amyA， narG， dsrA and ppx genes were most abundant in carbon， nitrogen， sulfur and phosphorus cycles， respectively， and were significantly correlated with pH， temperature and SO42-. The diversity and abundance of detected gene probes were negatively correlated with temperature. The α-diversity (i.e.， Shannon index) was high at low temperature and low pH. Molecular functional interactions revealed by the gene connectivity levels were negatively correlated with temperature， pH and SO42-. These results suggested that the abundance， diversity and interactions of microbial functional genes were significantly influenced by geochemical parameters?. In addition， some genera possessed functional genes related to carbon， nitrogen， sulfur， and phosphorus cycles and can synergistically control the biogeochemical cycles of carbon， nitrogen， sulfur and phosphorus. These findings provide new insights into the functional potentials of microorganisms to participate in biogeochemical cycles and their responses to environmental factors in hot springs.

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Response of global agricultural productivity anomalies to drought stress in irrigated and rainfed agriculture

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Science china Earth Sciences 2024年

作者： Xinxin CHEN Lunche WANG Qian CAO Jia SUN Zigeng NIU Liu YANG Weixia JIANG Hubei key laboratory of Regional Ecology and environmental Change School of Geography and Information EngineeringChina University of Geosciences State key laboratory of biogeology and environmental geology China University of Geosciences

The response of agricultural productivity anomalies to drought stress plays a crucial role in the carbon cycle within terrestrial ecosystems and in ensuring food security. However, detailed analysis of how global agricultural productivity anomalies response to drought stress, particularly within irrigated and rainfed agricultural systems, remains insufficient. In this study, the impact of drought stress on agricultural productivity anomalies during the growing season（zcNDVIS）, across both irrigated and rainfed agriculture, were analyzed using a suite of hydro-climatic variables. Specifically, the investigation utilized the multi-scalar Standardized Precipitation Evapotranspiration Index（SPEI）, the Multivariate ENSO Index（MEI）, and the Madden-Julian Oscillation（MJO）. Meanwhile, the relationships between hydroclimatic variables and zcNDVISwere analyzed at one, two, three and four months before the ending of growing season（EOS）. Results showed that（1） the percentages of significant（p<0.1） drying trends varied across the globe from 8.30% to 13.42%, 6.50% to 14.63%, 6.52% to 14.23%, and 6.47%to 14.95% at one-, two-, three-, and four-month lead times before EOS, respectively, during 2001–2020, which represented by the multiscalar SPEI. This observation highlights that most regions across the globe tend to be arid, which could significantly impact agricultural productivity;（2） the global mean correlation coefficients（rmax） for SPEI-1, SPEI-3, SPEI-6, SPEI-12（indicating SPEI at 1-, 3-, 6-, and 12-month lags）, MEI, and MJO with zcNDVISranged between 0.24–0.25, 0.27–0.28, 0.25–0.26, 0.21–0.22, –0.02–0.01 and 0.06–0.11, respectively, across both irrigated and rainfed agriculture system from 2001 to *** productivity anomalies demonstrated a significant correlation with drought stress. The strongest correlations were noted for SPEI-3 and SPEI-6, suggesting a delayed response of crops to drought conditions. This indicates that agriculture ecosystem experiences prolo

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Uncovering the largest negative carbon isotope excursion in Earth history

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Science china Earth Sciences 2024年第3期67卷 885-889页

作者： Chao LI Haiyang WANG State key laboratory of Oil and Gas Reservoir geology and Exploitation Chengdu University of TechnologyChengdu 610059China Institute of Sedimentary geology Chengdu University of TechnologyChengdu 610059China key laboratory of Deep-time Geography and Environment Reconstruction and Applications of ministry of Natural Resources Chengdu University of TechnologyChengdu 610059China International Center for Sedimentary Geochemistry and Biogeochemistry Research Chengdu University of TechnologyChengdu 610059China State key laboratory of biogeology and environmental geology China University of GeosciencesWuhan 430074China

The carbon cycle plays a pivotal role in regulating Earth’s surface environment through atmospheric-oceanic acid-base and redox processes, functioning as the engine driving the evolution of our planet’s surface. A deep understanding of the carbon cycle’s evolution is thus essential for our understanding of the evolution of our planet’s habitability.

关键词： carbon planet evolution

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Norian(Late Triassic) conodonts from the Raohe area， Heilongjiang， Northeastern china

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Journal of Earth Science 2024年

作者： Xianlang Wu Paul B.Wignall Xulong Lai Yan Chen Jinling Yuan Guiyue Luo Haishui Jiang State key laboratory of biogeology and environmental geology， School of Earth Sciences， china university of geosciences School of Earth and Environment， university of Leeds Hubei Institute of geosciences

The Raohe area of Heilongjiang Province， Northeast china belongs to the Nadanhada Terrane， which was in low latitudes of Panthalassa during the Triassic. The composition of the Late Triassic conodont fauna， derived from limestone lenses interpreted to be formed on seamounts， provides important new information on the pelagic biota in this ocean. New conodont samples collected from sections at Minzhu， Minnan and Chigangbei belong to three Norian conodont zones. In ascending order， they are: Mockina postera Zone， Mockina bidentata Zone and Parvigondolella andrusovi Zone. The Norian conodont fauna in the Raohe area has distinct attributes: there are a lot of cosmopolitan species (e.g. Mockina postera， Mockina bidentata， Parvigondolella andrusovi) which enable good global correlation; endemic conodont species are also present， (e.g. Mockina sakurae， Mockina shamiseni， Norigondolella nadanhadaensis) indicating that Panthalassa Ocean conodont populations also contains unique taxa; and some conodonts belong to taxa with much shorter ranges in surrounding epeiric seas (e.g. Carnepigondolella pseudoechinata， Neocavitella cavitata and Epigondolella vialovi). The presence of the latter “relicts” indicates that the seamounts were persistently suitable habitats for many millions of years in the Late Triassic.

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Respiratory protein-driven selectivity during the Permian-Triassic mass extinction

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The Innovation 2024年第3期5卷 122-128页

作者： Haijun Song Yuyang Wu Xu Dai Jacopo Dal Corso Fengyu Wang Yan Feng Daoliang Chu Li Tian Huyue Song William JFoster State key laboratory of biogeology and environmental geology School of Earth SciencesChina University of GeosciencesWuhan 430074China Biogéosciences UMR 6282CNRSUniversitéde Bourgogne21000 DijonFrance Universitat Hamburg Institute for Geology20148 HamburgGermany

Extinction selectivity determines the direction of macroevolution,especially during mass extinction;however,its driving mechanisms remain poorly *** investigating the physiological selectivity of marine animals during the Permian-Triassic mass extinction,we found that marine clades with lower O2-carrying capacity hemerythrin proteins and those relying on O2 diffusion experienced significantly greater extinction intensity and body-size reduction than those with higher O2-carrying capacity hemoglobin or hemocyanin *** findings suggest that animals with high O2-carrying capacity obtained the necessary O2 even under hypoxia and compensated for the increased energy requirements caused by ocean acidification,which enabled their survival during the Permian-Triassic mass ***,high O2-carrying capacity may have been crucial for the transition from the Paleozoic to the Modern Evolutionary Fauna.

关键词： extinction selectivity finding

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Brachiopods from the Silurian “Lower Red Beds” of Wuhan（E. Hubei， South china）: paleoecological and paleogeographical implications

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Journal of Earth Science 2024年

作者： Jia-Yi Yin Yi-Long Liu Lie-Bin Huang Yi-Ming Gong Rui-Wen Zong School of Earth Sciences， china university of geosciences Faculty of Land and Resources Engineering， Kunming university of Science and Technology State key laboratory of biogeology and environmental geology， china university of geosciences

The age and sedimentary environment of the Silurian “Lower Red Beds” (LRBs)， which occur widely in South china， have long been controversial because of the scarcity of index fossils. Recently， these beds have been dated by trilobites as middle-late Aeronian to early Telychian in age. Here， we report abundant brachiopods from the LRBs in Wuhan， Middle Yangtze Region， including atrypides (Meifodia hunanensis， Zygospiraella sp. 1， Zygospiraella sp. 2 and Nalivkinia? sp.)， spiriferides (Striispirifer acuminiplicatus， Striispirifer? sp.)， strophomenides (Eostropheodonta? sp. and Katastrophomena modesta)， and linguliformeans (Anomaloglossa? sp. and Orbiculoidea? sp.). Most of these are common in the Leijiatun， Xiangshuyuan， Shihniulan， Niuchang， Lojoping， and Shamao formations in the Upper Yangtze Region. The discovery of brachiopods from the LRBs in Wuhan not only enrich the biodiversity of the LRBs in the Yangtze Region， where Meifodia， Zygospiraella， Katastrophomena and Eostropheodonta are first found in the LRBs， but also expand the paleogeographical distribution of brachiopods to Middle-Lower Yangtze Region that first radiated after the end-Ordovician extinction. In addition， this brachiopod fauna also provides important implications for the sedimentary environment of LRBs during the Llandovery， which is usually developed in the nearshore shallow-water (BA1-2)， althought this paper extends to the deeper parts of the shallow-marine (BA3-4).

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Microbial communities and their influencing factors in the sediment of upper and mid-lower reaches of the Yellow River

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Journal of Earth Science 2024年

作者： Yanmin Zhang Zewei Gui Xiaofei Gao Jingxiao Zhang Yunni Gao Man Zhang Guokun Yang Xindang Zhang Xulu Chang Zixuan Gan Xiaolin Meng Xuejun Li Hongchen Jiang College of Fisheries， Henan Normal university State key laboratory of biogeology and environmental geology， china university of geosciences Wuhan College of Agricultural and environmental Sciences， university of California Davis

Sedimentary microbial communities play an important role in driving biogeochemical cycles in river ecosystems. However， limited is known about the microbial variation and its influencing factors in the high-turbid Yellow River. In this study， microbial communities and their influencing factors in the sediment of upper and mid-lower reaches of the Yellow River were examined. The results showed that Gammaproteobacteria were most dominant in Yellow River sediments. Deltaproteobacteria， Nitrospirae and family of Bacillaceae， Geobaceraceae were more abundant in the mid-lower reaches， while Gammaproteobacteria， Verrucomicrobia and family of Caldilineaceae， Llumatobacteraceae were more abundant in the upper reaches. The microbial communities were predominantly affected by nutrient factors (NH4+， TN and TP)， followed by the spatial factors and Chla content in the mid-lower reaches， while they were by predominantly affected by spatial factors， followed by the nutrient factors and Chla content in the upper reaches. The dominant microbial taxa were mostly correlated with COD， NH4+， TP and temperature. In summary， the sedimentary microbial communities differ between the upper and mid-lower reaches and respond differently to the environmental and spatial factors in the sediment of the Yellow River.

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Effects of typical karst tourist town on the Lijiang River water: from heavy metals to N-nitrosamines

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Journal of Earth Science 2024年

作者： Yuanyu Shan Yuru Su Xinli Xing Bingquan Zhu Honghu Zeng Yuan Zhang Junyu Li Xiaoyu Yan Wenwen Chen Benjian Li College of environmental Science and Engineering， Guilin university of Technology School of environmental Studies， china university of geosciences State key laboratory of biogeology and environmental geology， china university of geosciences College of arts， Guilin university of Technology College of arts and communication， china university of geosciences 430070 China

N-nitrosamines are nitrogenous organic pollutants with high carcinogenicity to human. Heavy metal pollution in aquatic system is currently a major environmental problem. Tourism in typical karst areas may influence the environment through wastewater discharge. However， it remains unclear whether these activities would cause water pollution. To evaluate the impact of tourism activities in typical tourist towns， this study investigated the occurrence and sources of 18 N-nitrosamines， eight heavy metals （HMs）， and dissolved inorganic nitrogen （DIN） in the Lijiang River and its tributaries. Seven N-nitrosamines were detected as the dominant compounds in N-nitroso-N-ethylaniline （NEA， average of 24.8 ng/L） and N-nitroso-l-proline （NPRO， 20.4 ng/L）， while especially low concentrations of HMs （Mn， Cu， As， Ni， Cr， Co， Pb， and Cd） and DIN (NH4+-N， NO2--N， and NO3--N) were observed. The most important influencing factors were seasonal factors， followed by land-use type and mainstem and tributary factors. Principal component analysis revealed that in the city with developed tourism and relatively less heavy industry， aquaculture and agricultural wastewater were identified as the primary sources of N-nitrosamines. Meanwhile， domestic sewage and agricultural wastewater were found to be the main sources of HMs and DIN， respectively. The ecological risk assessments for all pollutants are relatively low （< 1）. Therefore， N-nitrosamines， HMs， and DIN pollution caused by tourist activities pose a negligible risk to the Lijiang River.

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