Magnetite/Reduced Graphene Oxide Nanocomposites： One Step Solvothermal Synthesis and Use as a Novel Platform for Removal of Dye Pollutants

简单的用无毒、划算的先锋的步骤 solvothermal 策略被开发了准备磁铁矿 / 还原剂 graphene 氧化物(MRGO ) 为染料污染物质的移动的 nanocomposites。利用 graphene 和磁性的 nanoparticles 的联合好处，这些 MRGO nanocomposites 展览优秀移动效率(超过 91% 为玫瑰精 B 并且超过 94% 为孔雀石绿色) 并且从由一个外部磁场的水的答案的快速的分离。有趣地， MRGO composites 的性能强烈依赖于两 Fe3O4 和 pH 值装载。另外，这新吸附物的吸附行为与 Freundlich 等温线和 pseudo-second-order 适合很好运动模型。在进一步的应用程序，真实 samplesincluding 工业废物水和湖 waterhave 使用 MRGO composites 对待。所有结果证明 MRGO composites 是为染料污染物质的移动的有效吸附物并且能因此为染料净化提供一个新平台。

Porous β-cyclodextrin nanotubular assemblies enable high-efficiency removal of bisphenol micropollutants from aquatic systems

The performance of water purification by adsorption method has been limited owing to the fact that most of current available adsorbents fail to achieve satisfactory removal performance for organic micropollutants.Herein,we report the design and synthesis of novel porous polymeric adsorbent built fromβ-cyclodextrin(B-CD),in whichβ-CD molecules are arranged in an ordered bis(β-CD)tubular assemblies.The induction of bis(B-CD)units renders them high adsorption affinity toweard bisphenols(bisphenol A and its analogues bisphenol B,bisphenol F and bisphenol S),the typical endocrine disruptors,via the formation of stable host-guest inclusion complexes in aquatic systems.In combination with their high porosity(Brunauer-Emmett-Teller(BET)surface area of 150 m2·g-1),abundantβ-CD content and fast sorption kinetics,the obtained adsorbent outperforms commercial water purifier in elimination of bisphenol micropollutants from potable water.Our work may open a new avenue for designing highly eficient adsorbents for removal of organic micropollutants from aquatic systems.

Aggregation-induced T_(1)/T_(2)contrast enhancement for magnetic resonance imaging-guided intraoperative surgery

Magnetic resonance imaging(MRI)plays an important role in precision medicine that is hampered by the lack of contrast agents with high efficiency and the ability to translate diagnostic accuracy into therapeutic intervention.Herein,we demonstrate a DNA-based MRI probe that overcomes previous single-mode enhancement and provides a mechanism of action for aggregationinduced dual-modal MRI signal enhancement.A facile method is developed to produce aggregated T_(1)/T_(2)dual-modal NaGdF_(4):Dy@PDA-DNA(PDA=polydopamine)MRI probes.When aggregated,this probe can further amplify MRI signal intensity and exhibit improved geometrical and positional stability in vivo.The performance of the NaGdF_(4):Dy@PDA-DNA MRI probe toward MRI-guided preoperative planning and visualization-guided surgery is verified using an orthotopic tumor-bearing mouse model.The result shows that the rapid metabolism of the degraded probe leads to the mitigation of long-term toxic effects.Therefore,the developed high-performance MRI probe is of great significance for enhancing MRI diagnostic accuracy into precision medical therapeutic interventions.

Transition metal-nitrogen-carbon nanostructured catalysts for the oxygen reduction reaction： From mechanistic insights to structural optimization

在阴极加速限制率的氧减小反应(ORR ) 为燃料房间的商品化仍然是最前的问题。转变 metal-nitrogen-carbon (M-N/C， M = Fe，公司，等等) nanostructures 在实际燃料房间应用与令人满意的活动和稳定性是非宝贵的金属催化剂(NPMC ) 的最有希望的班。然而，活跃地点的长争论的性质并且逃犯结构表演关联阻碍 M-N/C 材料的进一步的开发。在这评论，我们阐明的现在的最近的努力由采用可以提供 M-N/C 催化剂的深刻机械学的理解的许多物理化学的技术的活跃地点的实际结构。然后，我们为控制结构的一致性并且在催化材料最大化活跃地点的数字与定制的先锋体系结构和修改合成线路为 M-N/C 材料在结构的优化策略集中于惊人进步。恰好活跃的中心的识别和 nanostructures 的地点特定的工程为设计有益的 M-N/C 催化剂提供未来方向。

Nanoparticulate X-ray CT contrast agents

X-ray computed tomography(CT) has been widely used as a powerful diagnostic tool in clinics because it can provide high-resolution 3D tomography of the anatomic structure based on the distinctive X-ray absorptions between different tissues. Currently, CT contrast agents are mainly small iodinated molecules, which suffer from drawbacks such as short blood- retention time, nonspecific in vivo biodistribution, and renal toxicity. Utilization of nanoparticles as potential CT contrast agents to overcome the aforementioned issues has advanced rapidly. In this mini review, we introduce current research efforts in the development of nanoparticulate CT contrast agents and discuss the challenges for additional breakthroughs in this field.

New Researches of State Key Laboratories in Analytical Chemistry

In the past two decades,as the eyes of fundamental scientific research and social activities relative to human security and health,analytical chemistry has made great progress in both analytical methodologies and detection instruments by integrating multidisciplinary research achievements.Four State Key Laboratories were successively established in this rapidly developing discipline.In order to publish some of the excellent results together,we have organized this special topic with 10 Articles and Reviews from these State Key Laboratories.

Hierarchically porous polymers with ultra-high affinity for bisphenol A enables high efficient water purification

The widespread use of bisphenol A(BPA)poses a serious threat to the environment and human health.However,efficient removal of BPA in water is incredibly challenging,owing to the inert chemical nature and electrical neutrality of BPA.In order to solve this problem,for the first time,we propose that a strategy of designing conjugated porous polymers with the pore size matching the size of BPA can greatly enhance the binding force of BPA.On this basis,we developed a novel conjugated poly 1,3,5-tri[4-(diphenylamino)phenyl]benzene(MPDPB)with intrinsic pore matching the size of BPA and multi-stage porous structure by editing polymerization with nitrobenzene.The binding energy of MPDPB to BPA is the highest at present(37.84 kcal/mol),which is 2.3 times that of the most powerful adsorbent previously reported and five times that of the conventional adsorbent.These advantages make MPDPB have super-high adsorption performance towards BPA and high absorbing stability under extreme environments.Impressively,MPDPB could be easily loaded on a non-woven fabric to generate point-of-use devices,which could eliminate more than 99.8%of BPA,making it the best BPA candidate adsorbent material.We believe that the proposed material design derived from the specific structure of the contaminant molecule can be extended to exploring further innovative adsorbents.

Nitrogen-skinned carbon nanocone enables non-dynamic electrochemistry of individual metal particles

Nano-impact electrochemistry is an efficient way to probe the physical and chemical properties of individual particles.Unfortunately,limited by the weak adsorption between particles and a microelectrode(ME),the particle collision events evolve randomly to be elastic or inelastic.These events occur intermittently to produce unmarked transient signal sets that seriously interfere with single particle measurement.Here,we report a nitrogen-skinned carbon nanocone electrode(NS-CNCE) to enhance its adsorption capacity greatly towards metal particles and thus realize non-dynamic(i.e.,inelastic impacts) single particle analysis.The surface of NS-CNCEs characteristic of excellent adhesion,smoothness,and conductivity can effectively capture the landing metal particles to form a stable contact for efficient electronic communication.Using superior NS-CNCEs,we investigated electrochemical oxidation of Ag(or Au) particles and electrocatalytic amplification of Pt particles,respectively,under non-dynamic electrochemistry.The determined particle size is highly consistent with the physical characterization.Statistical analysis of transient signals confirms the strong adhesion of NS-CNCEs to metal particles,which is also in line with the prediction of a particle-electrode adsorption energy model.The proposed strategy has effectively solved the major challenge of general single metal particle collision analysis.

Imaging Probes Offer New Opportunities for Understanding Cancer

Imaging analysis holds great promise for improving our understanding of the in vivo behavior of cancer,since it can offer important information regarding the activity of cancerrelated biomarkers and their dynamics as a function of time and space.Recently,important advances have been made in this field toward imaging probes.This thematic special issue on“Imaging Analysis”highlights recent achievements by researchers who achieved great improvement in designing novel probes for bioimaging applications.

Nanoparticles:Untying the Gordian Knot in Conventional Computed Tomography Imaging

X-ray computed tomography(CT)imaging plays an essential role in disease diagnosis due to its noninvasive,painless mode and superior penetration depth.However,the resolution of the soft tissue and minor lesions remains limited.And the disadvantages of conventional contrast agents,such as their inefficient targeting capability,poor biocompatibility,and short circulation times,are considered intractable in clinical use.To overcome these“Gordian knots,”nanoparticles(NPs)for CT imaging have been developed.The advantages of NPs are their exceptionally high sensitivity to X-ray,better imaging performance in vivos and even therapeutic effects.In particular,based on various designs,NP contrast agents composed of different materials integrate multiple imaging modalities,make up for the inadequacy of a single imaging type,and thus provide more accurate information for diagnosis.This review focuses on NPs for X-ray CT imaging and their multifunctional designs.Some perspectives of crucial problems and prospective challenges are also discussed.