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Long-term stable and catalytic 2D MXene nanosheets wrapped with dialdehyde xylan for ultrafast gelation

GREEN CHEMISTRY 2023年第11期25卷 4309-4318页

作者： Li, Nan Shao, Lupeng Xia, Qiang Tan, Shujun zhao, shuwen Li, XuPeng Su, Zhenhua Hao, Xiang Peng, Feng Beijing Forestry Univ MOE Engn Res Ctr Forestry Biomass Mat & Energy Beijing Key Lab Lignocellulos Chem Beijing 100083 Peoples R China Qilu Univ Technol Shandong Acad Sci Key Lab Pulp & Paper Sci & Technol Minist Educ Jinan 250353 Peoples R China China Natl Pulp & Paper Res Inst Beijing 100102 Peoples R China

Developing aqueous stable and catalytic Ti3C2Tx MXene suspensions remains a grand challenge. MXene nanosheets always undergo rapid degradation when exposed to water and oxygen, and the incorporation of reducing or capping agents may deteriorate the intrinsic characteristics of MXenes. Here, we coupled dialdehyde xylan (DAX) with MXene nanosheets to significantly increase the long-term storage of MXene in an aqueous solution (>3 months) with a dramatic enhancement of their room temperature catalytic activity for ultrafast gelation. DAX can form thick and smooth layers on the nanosheets via multiple hydrogen bonds, providing a reduction environment to prevent the occurrence of oxidation. Meanwhile, DAX can accelerate the generation of free radicals from the potassium persulfate (KPS)/MXene pair, reducing the polymerization time of vinyl monomers from similar to 30 min to similar to 90 s. Moreover, the DAX layer is capable of serving as additional crosslinks by leveraging Schiff base bonds with chitosan (CS), with the elongation at break increasing from 100% to 909%. The resultant MXene-based hydrogel can be further explored as a sustainable sensor for real-time physical signal monitoring. This work offers an enticing prospect for the development of eco-friendly and high-performance MXene-based materials.

关键词： Nanosheets

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Repurposing Xylan Biowastes for Sustainable Household Detergents

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ACS SUSTAINABLE CHEMISTRY & ENGINEERING 2023年第7期11卷 2949-2958页

作者： Wang, Hairong Li, Xupeng zhao, shuwen Liu, Qiaoling Li, Nan Su, Zhenhua Ren, Junli Hao, Xiang Peng, Feng China Natl Pulp & Paper Res Inst Beijing 100102 Peoples R China South China Univ Technol State Key Lab Pulp & Paper Engn Guangzhou 510640 Peoples R China Beijing Forestry Univ MOE Engn Res Ctr Forestry Biomass Mat & Energy Beijing Key Lab Lignocellulos Chem Beijing 100083 Peoples R China

Seeking sustainable and biocompatible detergent remains a big challenge. In this work, we report a new type of polysaccharide nanocrystal that is extracted from available industrial xylan biowastes via mild ammonium persulfate (APS) aqueous oxidation, which subsequently serves as a sustainable household detergent. By carefully adjusting the oxidation conditions (similar to 0.5 M, 60 degrees C), plate xylan hydrated nanocrystals (XNCs) can be accessed in reasonable yield (similar to 23%) with diameters of 30-50 nm and thicknesses of 5-12 nm. In comparison to the cellulose nanocrystal (CNC), the crystalline structure of XNCs demonstrates remarkable humidity-dependent behavior. Additionally, the acetylated xylan nanocrystals (AXNCs) exhibit high surface/interface activity to form stable Pickering emulsions, intriguing cleaning efficiency in removing stains from fabric surfaces, and the capability to de-wet oil from various types of tableware material. Seed germination, crop growth, and aquatic ecotoxicological evaluation demonstrate that AXNCs show no toxicity toward plants and zebrafish (median lethal concentration > 20,000 mg/L) with which they can be applied either as eco-friendly laundry or kitchen detergents. Our work presents a new avenue for converting industrial biowastes into sustainable household materials.

关键词： industrial xylan biowastes acetylated xylan nanocrystals (AXNCs) household detergents no toxicity sustainable

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Enhancement of Scintillation Properties of LYSO:Ce Crystals by Al Codoping

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CRYSTAL GROWTH & DESIGN 2023年第6期23卷 4562-4570页

作者： Xue, Zhongjun Chen, Lu zhao, shuwen Yang, Fan An, Ran Wang, Linwei Sun, Yi-Yang Feng, He Ding, Dongzhou Chinese Acad Sci Shanghai Inst Ceram Shanghai 201899 Peoples R China Univ Chinese Acad Sci Ctr Mat Sci & Optoelect Engn Beijing 100049 Peoples R China Shanghai Univ Sch Mat Sci & Engn Shanghai 200444 Peoples R China Northeastern Univ Sch Mat Sci & Engn Key Lab Anisotropy & Texture Mat Minist Educ Shenyang 110819 Liaoning Peoples R China Nankai Univ Sch Phys Tianjin 300071 Peoples R China China Acad Engn Phys Inst Fluid Phys Mianyang 621900 Sichuan Peoples R China

Single-crystal lutetium yttrium oxyorthosilicate doped by cerium (LYSO:Ce) has been widely adopted as a scintillator material for radiation detection. The demands from nuclear medical imaging, as well as high-energy physics, are calling for ever-increasing scintillation properties. Here, Al3+ codoping of LYSO:Ce is realized for the first time, and a series of LYSO:Ce,xAl (x = 0, 0.3, 0.6, and 1.0 atom %) crystals are successfully grown by a micro-pulling down (mu-PD) method. It is found that at x = 0.6 atom %, the overall scintillation properties are simultaneously improved. In particular, the slow component of rise time and the afterglow level are drastically reduced by 350% (from 304 to 86 ps) and an order of magnitude (from 0.2 to 0.02%), respectively. The energy resolution is also enhanced from 16.1 to 10.9%. These results are attributed to the fact that Al3+ codoping significantly reduces the concentration of traps, accelerates the excited state lifetime of Ce3+ ions and introduces a faster scintillating luminescence center, Ce4+ ions. Our LYSO:Ce,0.6 atom % Al crystal offers a gain in the image signal-to-noise ratio of 1.4 over the non-codoped crystal, which will significantly benefit the next-generation time-of-flight positron emission tomography and enable more precise diagnosis of diseases.

关键词： Atoms

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Great Enhancing Overall Performances of YSO:Ce Scintillation Crystals by Ni Codoping

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CRYSTAL GROWTH & DESIGN 2024年第17期24卷 7166-7172页

作者： Zhang, Zhe zhao, shuwen Xue, Zhongjun Shi, Junjie Zhang, Aochen Zheng, Xiang Li, Chengyi Qiu, Peng Shi, Hongsheng Xiao, JiaWen Ding, Dongzhou Shanghai Univ Sch Microelect Shanghai 201800 Peoples R China Chinese Acad Sci Shanghai Inst Ceram Shanghai 201899 Peoples R China Chinese Acad Sci Res Ctr Crystal Mat State Key Lab Funct Mat & Devices Special Environm Xinjiang Key Lab Funct Crystal MatXinjiang Tech I Urumqi 830011 Peoples R China Beijing Univ Technol Coll Mat Sci & Engn Beijing Key Lab Microstruct & Property Adv Mat Beijing 100124 Peoples R China

Cerium-doped yttrium oxyorthosilicate (YSO:Ce) scintillation crystals are widely used in mixed radiation field detection, radioactive isotope monitoring, and other fields due to their excellent scintillation properties and low cost. However, the poor coincidence time resolution severely limits their further promotion. In order to resolve this problem, this work first designed and conducted research on Ni2+-codoped YSO:Ce crystals, and a series of YSO:Ce,xNi (x = 0, 0.3, 0.6, and 1.5 atom %) crystals were grown using the Czochralski method. It is found that codoping with 0.6 atom % Ni2+ can improve the overall scintillation performances of YSO:Ce crystals. In particular, the ratio of light output to scintillation decay time significantly improved by 71%, which is currently the best optimization result reported in the orthosilicate-based scintillation crystals systems. In addition, the afterglow level has been optimized by 2 orders of magnitude, and the energy resolution has been improved from 9.2% to 6.7%, greatly enhancing its potential commercial applications. This is mainly attributed to Ni2+ codoping, significantly reducing the concentration of carrier traps in YSO:Ce,xNi crystals, reducing the emission proportion of the slow-emitting center Ce2, and introducing the fast scintillation center Ce4+ into the crystals. Based on the experimental results, the possible mechanisms of the above phenomenon were discussed in the article.

关键词： Scintillation

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Linking Bacterial Growth Responses to Soil Salinity with Cd Availability

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BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 2022年第2期109卷 286-297页

作者： Wang, Lifu Qin, Luyao Sun, Xiaoyi zhao, shuwen Yu, Lei Wang, Meng Chen, Shibao Chinese Acad Agr Sci Inst Agr Resources & Reg Planning Key Lab Plant Nutr & Fertilizer Minist Agr & Rural Affairs 12 Zhongguancun South St Beijing 100081 Peoples R China

This study investigated the effects of different types of saline stress on the availability of cadmium (Cd) and bacterial growth. Changes in soil physicochemical properties and DTPA-Cd content as well as microbial responses after the addition of salts were measured. The addition of 18 g kg(-1) of salts with NaCl and Na2SO4 increased the available Cd content by up to 17.80%-29.79%. Respiration rate, biomass, and relative bacterial growth decreased with increasing salt concentrations. Estimated salinity tolerance of bacterial communities based on pollution-induced community tolerance. The salinity tolerance index EC50 of the bacterial community was estimated by logistic equation and ranged from 4.32-12.63 g kg(-1). Structural equation modeling showed that soil salinity stress significantly affected Cd availability and bacterial community, while bacterial growth characteristics also contributed to reducing available Cd. We conclude that saline stress can alter soil Cd availability in soils by affecting the growth characteristics of soil bacterial communities.

关键词： Salinity stress Cd availability Soil properties Bacterial growth SEM

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Soil bacterial community responses to cadmium and lead stabilization during ecological restoration of an abandoned mine

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SOIL USE AND MANAGEMENT 2022年第3期38卷 1459-1469页

作者： zhao, shuwen Qin, Luyao Wang, Lifu Sun, Xiaoyi Yu, Lei Wang, Meng Chen, Shibao Chinese Acad Agr Sci Inst Agr Resources & Reg Planning Minist Agr & Rural Affairs Key Lab Plant Nutr & Fertilizer Beijing 100081 Peoples R China

Ecological restoration refers to the gradual recovery of damaged ecosystems by utilizing their self-recovery capacity and artificial measures. It is considered as an effective technique to alleviate heavy metal pollution in open-pit mining soils. However, little is known about the stability of heavy metals and soil bacterial responses in artificially restored soil-plant systems. In this study, different vegetation restoration strategies were established in the Dabaoshan mining area, China, and the accumulation and transfer of Cd/Pb in the soil-plant system and the responses of the soil bacterial community were investigated. Results showed that ecological restoration with a combination of trees, shrubs and grasses/herbs could increase soil cation-exchange capacity and organic matter content, but not soil pH. The mixture of trees, shrubs and grasses/herbs was most effective for reducing the available Pb content to 33.7% of the content in the control, and the mixture of trees and grasses/herbs was beneficial in reducing Cd to 60.4% of the content in the control. Data showed that ecological restoration could change the quantity, composition and community structure of soil microorganisms. The soils in which a mixture of trees, shrubs and grasses/herbs were grown had the greatest abundance and diversity of bacteria;the abundances of Proteobacteria increased by 12% and Actinobacteria by 5% from those of the control. Plant coverage, soil available Cd content, and organic matter emerged as major determinants of bacterial community composition. This study demonstrates a promising remediation strategy for limiting Cd/Pb mobility in mining areas.

关键词： an abandoned mine heavy metals microbes stabilization trees shrubs and grasses/herbs

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Ecological risk thresholds for Zn in Chinese soils

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SCIENCE OF THE TOTAL ENVIRONMENT 2022年 833卷 155182页

作者： zhao, shuwen Qin, Luyao Wang, Lifu Sun, Xiaoyi Yu, Lei Wang, Meng Chen, Shibao Chinese Acad Agr Sci Inst Agr Resources & Reg Planning Key Lab Plant Nutr & Fertilizer Minist Agr & Rural Affairs Beijing 100081 Peoples R China 12 Zhongguancun South St Beijing 100081 Peoples R China

The environmental risk threshold of a pollutant isa yardstick to measure soil environmental quality. The derivation of ecological risk thresholds of the heavy metal zinc (Zn) in soil environments based on up-to-date ecological risk assessments plays an important role in soil protection policy. According to regional soil classification, different representative soils with various degrees of acidity and alkalinity were selected, and a data set comprising ecotoxicities of Zn to 21 different test endpoints (plants, soil fauna, microorganisms, etc.) found in representative farmland soils of China was compiled based on new and published data to determine toxicological limits of Zn effects on endpoints. These limits were derived from fitted dose-response model parameters and indicated by EC10 values (the effective concentrations of Zn that inhibit 10% of endpoint bioactivity and also represents the toxicity threshold of Zn in this study) ranging from 36 ***(-1) to 682 ***(-1). The hormesis effect appeared in the dose-response curve of Zn, for example, the relative Chinese cabbage growth reached more than 120% at most. Zn concentrations added in toxicity tests were also corrected for aging and leaching effects in order to more accurately reflect field conditions. The hazardous concen-trations for 5% of the species affected (HC5) were derived by the species sensitivity distribution (SSD) approach for four major types of Chinese soils: acidic (38 ***(-1)), neutral (106 ***(-1)), alkaline (217 ***(-1)), and alkaline calcareous soils (155 ***(-1)). Prediction models of ecological risk thresholds for Zn based on soil properties were generated, such as logHC(5) = 0.564 + 0.218pH + 0.097OC (R-2 = 0.790, p < 0.001). The predicted models based on lab test data were verified in the field, and the measured field data fell within two-fold of the prediction intervals. This work provides a scientific framework for developing soil-specific guidance on Zn toxicity thresholds.

关键词： Zinc Dose-response curve Species sensitive distribution (SSD) Predicted no-effect concentration (PNEC) Hazardous concentration (HC5 ) Hormesis

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Regulating High Electron Spin State in Co3S4 for Enhanced Water Splitting

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ACS CATALYSIS 2025年第11期15卷 9845-9855页

作者： Long, Youyu zhao, shuwen Wang, Lilian Deng, Hao Sun, Tao Jiang, Jingwen Liu, Tingting Sun, Shaodong Chen, Anran Zhang, Hua Yunnan Univ Sch Mat & Energy Yunnan Key Lab Electromagnet Mat & Devices Kunming 650091 Peoples R China Chinese Acad Sci Fujian Inst Res Struct Matter State Key Lab Struct Chem Fuzhou 350002 Peoples R China Yunnan Univ Electron Microscopy Ctr Kunming 650091 Peoples R China Nanjing Univ Coll Engn & Appl Sci Natl Lab Solid State Microstruct Nanjing 210093 Peoples R China Xian Univ Technol Engn Res Ctr Conducting Mat & Composite Technol Shaanxi Engn Res Ctr Met Based Heterogeneous Mat & Sch Mat Sci & EngnMinist EducShaanxi Prov Key La Xian 710048 Peoples R China

Implementing the hydrogen economy requires reducing the energy costs of electrocatalytic water splitting, thus making it crucial to design low-cost and high-efficiency electrocatalysts to minimize the needed overpotential for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Here, we propose a non-noble metal bifunctional electrocatalyst (HS Co3S4) with a high-spin state by adjusting the coordination structure of spinel sulfide (Co3S4). An analysis based on crystal field theory, molecular orbital theory, and density functional theory revealed that the unpaired electrons in the low-coordination Co in HS Co3S4 occupied the high-energy eg* orbitals, resulting in a high-spin state. This unpaired electron in a high-spin state accelerates the transfer of electrons from the catalyst to the reaction intermediate, reducing the activation energy required for the electrocatalytic reaction and facilitating the HER and OER. The developed HS Co3S4 catalyst requires overpotentials of 70 and 222 mV to drive a current density of 10 mA cm-2 for HER and OER, respectively. An anion exchange membrane water electrolyzer with this catalyst requires only 1.78 V to achieve an industrial-level current density of 1 A cm-2, and it can operate stably for 1000 h. This work provides a promising strategy to regulate the electron spin state of low-cost catalysts for large-scale hydrogen production.

关键词： high spintronic state electrocatalysis hydrogenevolution reaction oxygen evolution reaction anionexchange membrane

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CAS FGOALS-f3-L Model Datasets for CMIP6 DCPP Experiment

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Advances in Atmospheric Sciences 2023年第10期40卷 1911-1922页

作者： Shuai HU Bo WU Yiming WANG Tianjun ZHOU Yongqiang YU Bian HE Pengfei LIN Qing BAO Hailong LIU Kangjun CHEN shuwen zhao State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China University of the Chinese Academy of Sciences Beijing 100864China

The outputs of the Chinese Academy of Sciences(CAS)Flexible Global Ocean-Atmosphere-Land System(FGOALSf3-L)model for the decadal climate prediction project(DCPP)of the Coupled Model Intercomparison Project Phase 6(CMIP6)are described in this *** FGOALS-f3-L was initialized through the upgraded,weakly coupled data assimilation scheme,referred to as EnOI-IAU,which assimilates observational anomalies of sea surface temperature(SST)and upper-level(0–1000-m)ocean temperature and salinity profiles into the coupled ***,nine ensemble members of 10-year hindcast/forecast experiments were conducted for each initial year over the period of 1960–2021,based on initial conditions produced by three initialization *** hindcast and forecast experiments follow the experiment designs of the Component-A and Component-B of the DCPP,*** decadal prediction output datasets contain a total of 44 monthly mean atmospheric and oceanic *** preliminary evaluation indicates that the hindcast experiments show significant predictive skill for the interannual variations of SST in the north Pacific and multi-year variations of SST in the subtropical Pacific and the southern Indian Ocean.

关键词： CMIP6 DCPP FGOALS-f3-L decadal prediction model initialization

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Research on the application of immersive media in new retail cyberspace

Research on the application of immersive media in new retail...

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International Conference on Image Processing and Intelligent Control (IPIC)

作者： Zhang KeWei Jiang Mai zhao shuwen Liaoning Commun Univ Dept Animat Shenyang 110136 Peoples R China Criminal Invest Police Univ China Dept Criminal Invest & Counter Terrorism Collge Shenyang 110854 Peoples R China Pukyong Natl Univ Dept Marine Design Convergence Engn Busan 48513 South Korea

ISBN: (数字)9781510647251

ISBN: (纸本)9781510647251;9781510647244

While the new pneumonia epidemic (CVD-19) has had an unprecedented impact on the traditional economic model, it has also given a huge boost to the new retail industry immersive technologies such as Virtual Reality (VR) and Augmented Reality (AR). Mixed Reality (MR)will achieve breakthrough development of even more 5G technology, focusing on digital media with multi-sensory interaction features such as visual, auditory, and kinesthetic-immersive media-to build a new paradigm for commercial information dissemination Therefore, it is of obvious relevance to understand the value of immersive media in the digital retail space an to find the right way to apply it to the way coastal cities grow economically.

关键词： New Retail Virtual Reality 3D images online sales

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