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Heavy metal removal from aqueous solutions by chitosan-based magnetic composite flocculants

Journal of Environmental Sciences 2021年第10期33卷 22-32页

作者： xuefeng xiao Yuanyuan Yu Yongjun Sun Xing Zheng Aowen Chen College of Urban Construction Nanjing Tech UniversityNanjing 211800China Department of Civil and Environmental Engineering The Hong Kong University of Science and TechnologyHong Kong 999077China

In this study,three magnetic flocculants with different chelating groups,namely,carboxymethyl chitosan-modified Fe_(3)O_(4)flocculant(MC),acrylamide-grafted magnetic carboxymethyl chitosan flocculant(MCM),and 2-acrylamide-2-methylpropanesulfonic acid copolyacrylamide-grafted magnetic carboxymethyl chitosan flocculant(MCAA)were prepared,synthesized,and characterized by photopolymerization technology.They were applied to the flocculation removal of Cr(Ⅲ),Co(Ⅱ),and Pb(Ⅱ).The effect of flocculation condition on the removal performance of Cr(Ⅲ),Co(Ⅱ),and Pb(Ⅱ)was studied.Characterization results show that the three magnetic carboxymethyl chitosan-based flocculants have been successfully prepared with good magnetic induction properties.Flocculation results show that the removal rates of MC,MCM,and MCAA on Cr(Ⅲ)are 51.79%,82.33%,and 91.42%,respectively,under the conditions of 80 mg/L flocculant,pH value of 6,reaction time of 1.5 hr,G value of 200 s^(-1),and precipitation magnetic field strength of 120 mT.The removal rates of Co(Ⅱ)by MC,MCM,and MCAA are 54.33%,84.99%,and 90.49%,respectively.The removal rates of Pb(Ⅱ)by MC,MCM,and MCAA are 61.54%,91.32%,and 95.74%,respectively.MCAA shows good flocculation performance in composite heavy metal-simulated wastewater.The magnetic carboxymethyl chitosan-based flocculant shows excellent flocculation performance in removing soluble heavy metals.This research provides guidance and ideas for the development of efficient and low-cost flocculation technology to remove heavy metals in wastewater.

关键词： Flocculant Carboxymethyl chitosan Magnetic flocculants Heavy metal Flocculation

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Optical and scintillation properties of Bi_4Si_3O_(12):RE(RE=Eu^(3+), Sm^(3+),Ho^(3+), Tb^(3+))single crystals

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Journal of Rare Earths 2019年第3期37卷 260-264页

作者： xuefeng xiao Jiayue Xu Haicheng Wei Yaoqing Chu Bobo Yang xuefeng Zhang Key Laboratory of Physics and Photoelectric Information Functional Materials Sciences and Technology North Minzu University College of Electric and Information Engineering North Minzu University School of Materials Science and Engineering Tongji University School of Materials Science and Engineering Shanghai Institute of Technology Ningxia Ju Jing Yuan Crystal Technology Company Limited

Bi_4 Si_3 O_(12):RE(BSO:RE, RE = Eu^(3+), Sm^(3+), Ho^(3+), Tb^(3+)) crystals were grown by the modified vertical Bridgeman method, and doping effects on scintillation properties were investigated. Under γ-ray irradiation, the light yield of BSO doped with small doses of Eu^(3+) increases slightly, and the energy resolution improves significantly compared to pure BSO, therefore the ability of distinguishing between particles will be improved for BSO crystals with a small amount of Eu^(3+) dopant. The results show that a small amount of Eu^(3+) doping can sensitize the Bi^(3+) ions. The sensitization effect enables the reduction of intrinsic defects, and thus improves the scintillation properties. However, the relative light yield of BSO:Tb(1.0 mol%) crystal is 4.3%, which is smaller than 5.0% of pure BSO. The improved light yield and energy resolution in the BSO:Eu and BSO:Sm crystals are considered an impressive achievement in the optimization of this scintillator which is already suitable for applications such as dual-readout calorimeters and homogeneous hadron calorimeters.

关键词： BSO crystal Vertical Bridgeman method Scintillation characteristics Relative light yield Rare earths

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A practical synthesis of β-carbolines by tetra-n-butylammonium bromide (TBAB)-mediated cycloaromatization reaction of aldehydes with tryptophan derivatives

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Chinese Chemical Letters 2019年第8期30卷 1541-1544页

作者： Zhen Wang Zhenzhen Yu Yao Yao Yakai Zhang xuefeng xiao Bin Wang College of Pharmacy and Tianjin Key Laboratory of Molecular Drug Research Nankai UniversityTianjin 300353China Tianjin University of Traditional Chinese Medicine Tianjin 300193China

A mild and efficient n Bu4 NBr-mediated oxidative cycloaromatization to prepareβ-carbolines from readily available tryptophans and aldehydes is described.The reaction is practical and allows the synthesis ofβ-carbolines on gram-scale.Some of products crystallized from the reaction mixture and were easily removed by filtration,obviating the need for chromatographic separation.

关键词： Carbolines Tryptophan Cycloaromatization TBAB Tetra-n-butylammonium bromide

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Toward Improved Accuracy in Quasi-Static Elastography Using Deep Learning

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Computer Modeling in Engineering & Sciences 2024年第4期139卷 911-935页

作者： Yue Mei Jianwei Deng Dongmei Zhao Changjiang xiao Tianhang Wang Li Dong xuefeng Zhu Department of Engineering Mechanics State Key Laboratory of Structural Analysis for Industrial EquipmentDalian University of TechnologyDalian116023China International Research Center for Computational Mechanics Dalian University of TechnologyDalian116023China DUT-BSU Joint Institute Dalian University of TechnologyDalian116023China Department of Automotive Engineering Tongji UniversityShanghai201804China *** SeattleWA98109USA School of Automotive Engineering Dalian University of TechnologyDalian116023China

Elastography is a non-invasive medical imaging technique to map the spatial variation of elastic properties of soft tissues.The quality of reconstruction results in elastography is highly sensitive to the noise induced by imaging measurements and processing.To address this issue,we propose a deep learning(DL)model based on conditional Generative Adversarial Networks(cGANs)to improve the quality of nonhomogeneous shear modulus reconstruction.To train this model,we generated a synthetic displacement field with finite element simulation under known nonhomogeneous shear modulus distribution.Both the simulated and experimental displacement fields are used to validate the proposed method.The reconstructed results demonstrate that the DL model with synthetic training data is able to improve the quality of the reconstruction compared with the well-established optimization method.Moreover,we emphasize that our DL model is only trained on synthetic data.This might provide a way to alleviate the challenge of obtaining clinical or experimental data in elastography.Overall,this work addresses several fatal issues in applying the DL technique into elastography,and the proposed method has shown great potential in improving the accuracy of the disease diagnosis in clinical medicine.

关键词： Nonhomogeneous elastic property distribution reconstruction deep learning finite element method inverse problem elastography conditional generative adversarial network

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多功能硅酸铋晶体的生长与掺杂

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应用技术学报 2024年第1期24卷 22-34页

作者：徐家跃张彦田甜陈媛芝申慧肖学峰熊正烨李永攀马云峰上海应用技术大学材料科学与工程学院上海201418 北方民族大学电气信息工程学院银川750021 广东海洋大学电子与信息工程学院广东湛江524088

硅酸铋(Bi_(4)Si_(3)O_(12),BSO)晶体是重要的闪烁材料,具有较快的衰减时间、适中的熔点和密度、原料成本低等优势。掺杂不仅能够提高BSO晶体闪烁性能,还可以使其成为多功能材料,比如荧光晶体、激光晶体。总结了BSO晶体的主要研究进展,... 详细信息

硅酸铋(Bi_(4)Si_(3)O_(12),BSO)晶体是重要的闪烁材料,具有较快的衰减时间、适中的熔点和密度、原料成本低等优势。掺杂不仅能够提高BSO晶体闪烁性能,还可以使其成为多功能材料,比如荧光晶体、激光晶体。总结了BSO晶体的主要研究进展,采用坩埚下降法成功生长了大尺寸BSO晶体,浓度3%以上的稀土掺杂能有效抑制组分偏析;稀土掺杂BSO晶体是导热性能良好的荧光发光材料,紫外光激发下Dy掺杂BSO晶体发黄光,Dy/Tm共掺BSO晶体可实现白光LED发光;研究了Yb、Er、Ho、Tm等稀土掺杂BSO晶体的光谱特性,在Ho:BSO、Tm:BSO晶体中分别实现了0.73 W、0.65 W的激光输出;纯BSO晶体是以Bi3+为发光中心的闪烁晶体,微量Dy掺杂可使BSO晶体光输出提高50%,1%Ta掺杂也能显著提高光输出;BGSO混晶也具有闪烁、激光等发光性能,通过调节组分可以开发出梯度闪烁晶体,稀土掺杂BGSO还可能成为激光晶体。

关键词：硅酸铋晶体生长闪烁体荧光体激光

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Theoretical investigations of ESR and optical spectra of crystalline KHSO_4:Mn^(2+)

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Chinese Science Bulletin 2011年第7期56卷 691-694页

作者： xiao xuefeng DU MaoLu MIAO Feng HUANG Yi Department of Physics Beifang University of NationalitiesYinchuan 750021China Department of Physics Southwest University for NationalitiesChengdu 610041China

Calculations of d-d transitions and the axial zero-field splitting parameter D in crystalline KHSO4:Mn2+ have been undertaken, with consideration of the ninth O2– ligand. Energy level values calculated in a tetragonal field are in good agreement with experimentally observed values. Occasionally degenerate energy levels of 4A1(4Eg(G)) and 4A1(4A1g(G)) were found in the tetragonal crystal field. The calculated value of D is in good agreement with experimental value for KHSO4:Mn2+.

关键词：硫酸氢钾结晶 ESR 锰光谱计算值零场分裂实验值

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基于TLR4/MyD88/MAPK信号通路探讨脉络舒通丸抗血栓性浅静脉炎的作用机制研究

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天津中医药大学学报 2024年第1期43卷 22-29页

作者：王清果曹宁宁李市荣张琬靖孙成宏姚景春张贵民肖学凤天津中医药大学中药学院天津301617 天津中医药大学第二附属医院天津300250 鲁南制药集团股份有限公司新药药理中心临沂276000 国家癌症中心国家肿瘤临床医学研究中心河北中国医学科学院肿瘤医院廊坊065001

[目的]探讨脉络舒通丸抗血栓性浅静脉炎(STP)的作用机制。[方法]将36只日本大耳白兔随机分为正常组、模型组、脉络舒通丸低、中、高剂量组、地奥司明组(阳性药对照),每组6只。除正常组外,其余各组均采用耳缘静脉注射20%甘露醇建立STP兔... 详细信息

[目的]探讨脉络舒通丸抗血栓性浅静脉炎(STP)的作用机制。[方法]将36只日本大耳白兔随机分为正常组、模型组、脉络舒通丸低、中、高剂量组、地奥司明组(阳性药对照),每组6只。除正常组外,其余各组均采用耳缘静脉注射20%甘露醇建立STP兔模型。造模同时各给药组连续灌胃给药14 d。苏木精-伊红(HE)染色法检测各组兔耳组织病理变化;酶联免疫吸附(ELISA)法检测各组血清中白细胞介素-1β(IL-1β)、肿瘤坏死因子-α(TNF-α)和白细胞介素-6(IL-6)的水平;测定凝血4项;蛋白免疫印迹(Western Blot)法检测耳组织Toll样受体4(TLR4)、髓样分化因子88(MyD88)、细胞外信号调节激酶(ERK1/2)、p38丝裂原活化蛋白激酶(p38MAPK)和c-氨基酸末端激酶(JNK)蛋白表达及相关磷酸化水平。[结果]与正常组比较,模型组病理损伤评分显著增加(P<0.01);血清中IL-1β、TNF-α和IL-6的表达水平明显升高(P<0.05);活化部分凝血酶时间(APTT)、凝血酶原时间(PT)、凝血酶时间(TT)缩短,纤维蛋白原(FIB)含量升高(P<0.05);TLR4、MyD88、丝裂原活化蛋白激酶(MAPK,包括p38MAPK、ERK1/2和JNK)蛋白及相关磷酸化水平均显著上调(P<0.01)。与模型组比较,脉络舒通丸低、中、高剂量组、地奥司明组兔耳组织病理损伤显著改善,病理损伤评分明显降低(P<0.05或P<0.01);血清中IL-1β、TNF-α和IL-6的表达水平显著降低(P<0.05或P<0.01);APTT、PT、TT明显延长,FIB含量明显降低(P<0.05或P<0.01);TLR4、MyD88、MAPK(p38MAPK、ERK1/2和JNK)蛋白及相关磷酸化水平均显著下调(P<0.05或P<0.01)。[结论]脉络舒通丸可能通过抑制TLR4/MyD88/MAPK信号通路,减轻炎症反应,改善凝血功能,从而发挥抗血栓性浅静脉炎作用。

关键词：脉络舒通丸血栓性浅静脉炎 TLR4/MyD88/MAPK信号通路作用机制

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Cationic ordering transition in oxygen-redox layered oxide cathodes

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Carbon Energy 2024年第1期6卷 197-206页

作者： Xinyan Li Ang Gao Qinghua Zhang Hao Yu Pengxiang Ji Dongdong xiao xuefeng Wang Dong Su xiaohui Rong Xiqian Yu Hong Li Yong-Sheng Hu Lin Gu Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijingChina College of Materials Science and Opto-Electronic Technology University of Chinese Academy of SciencesBeijingChina Beijing National Center for Electron Microscopy and Laboratory of Advanced Materials School of Materials Science and EngineeringTsinghua UniversityBeijingChina Beijing Advanced Innovation Center for Materials Genome Engineering Huairou DivisionInstitute of PhysicsChinese Academy of SciencesBeijingChina

Understanding the structural origin of the competition between oxygen 2p and transition-metal 3d orbitals in oxygen-redox(OR)layered oxides is eminently desirable for exploring reversible and high-energy-density Li/Na-ion cathodes.Here,we reveal the correlation between cationic ordering transition and OR degradation in ribbon-ordered P3-Na_(0.6)Li_(0.2)Mn_(0.8)O_(2) via in situ structural analysis.Comparing two different voltage windows,the OR capacity can be improved approximately twofold when suppressing the in-plane cationic ordering transition.We find that the intralayer cationic migration is promoted by electrochemical reduction from Mn^(4+)to Jahn–Teller Mn^(3+)and the concomitant NaO_(6) stacking transformation from triangular prisms to octahedra,resulting in the loss of ribbon ordering and electrochemical decay.First-principles calculations reveal that Mn^(4+)/Mn^(3+)charge ordering and alignment of the degenerate eg orbital induce lattice-level collective Jahn–Teller distortion,which favors intralayer Mn-ion migration and thereby accelerates OR degradation.These findings unravel the relationship between in-plane cationic ordering and OR reversibility and highlight the importance of superstructure protection for the rational design of reversible OR-active layered oxide cathodes.

关键词： cationic ordering layered oxide cathodes oxygen redox sodium-ion batteries

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Tensile Mechanical Behavior and Failure Mechanism of a Plain-Woven SiCf/SiC Composites at Room and Elevated Temperatures

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Journal of Materials Science and Chemical Engineering 2024年第4期12卷 67-83页

作者： Jianze He xuefeng Teng xiao’an Hu xiao Luo Qi Zeng Xueqiang Cao School of Aircraft Engineering Nanchang Hangkong University Nanchang China Jiangxi Key Laboratory of Micro Aeroengine Nanchang China Hunan Aviation Powerplant Research Institute Aero Engine Corporation of China Zhuzhou China State Key Laboratory of Silicate Profound Building Materials Wuhan University of Technology Wuhan China

Ceramic matrix composites (CMCs) are the preferred materials for solving advanced aerospace high-temperature structural components;it has the comprehensive advantages of higher temperature (~1500˚C) and low density. In service environments, CMCs exhibit complex damage mechanisms and failure modes, which are affected by constituent materials, meso-architecture and inhere defects. In this paper, the in-plane tensile mechanical behavior of a plain-woven SiCf/SiC composite at room and elevated temperatures was investigated, and the factors affecting the tensile strength of the material were discussed in depth. The results show that the tensile modulus and strength of SiCf/SiC composites at high temperature are lower, but the fracture strain increases and the toughness of the composites is enhanced;the stitching holes significantly weaken the tensile strength of the material, resulting in the material is easy to break at the cross-section with stitching holes.

关键词： Plain-Woven SiCf/SiC Composites Damage and Failure Analysis Stitching Hole

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六味地黄丸治疗围绝经期综合征的临床研究进展

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药物评价研究 2022年第4期45卷 804-809页

作者：岳晨肖学凤秦文杰北京振东光明药物研究院有限公司北京100085 天津中医药大学中药学院天津301617

围绝经期综合征是女性绝经前后的常见疾病,临床研究发现六味地黄丸治疗该病具有较好的疗效。经典名方六味地黄丸由熟地黄、山茱萸、山药、泽泻、牡丹皮、茯苓6味中药组方,可有效改善患者的血管舒缩、情绪失常、睡眠障碍、脂代谢紊乱、... 详细信息

围绝经期综合征是女性绝经前后的常见疾病,临床研究发现六味地黄丸治疗该病具有较好的疗效。经典名方六味地黄丸由熟地黄、山茱萸、山药、泽泻、牡丹皮、茯苓6味中药组方,可有效改善患者的血管舒缩、情绪失常、睡眠障碍、脂代谢紊乱、骨质流失等症状,其药效机制可能在于调节患者的雌激素水平,进而改善患者全身症状。综述六味地黄丸治疗围绝经期综合征的临床研究进展,以期为后续临床和实验研究提供参考。

关键词：六味地黄丸围绝经期综合征血管舒缩睡眠障碍脂代谢紊乱骨质流失

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