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Defects‑Rich Heterostructures Trigger Strong Polarization Coupling in Sulfides/Carbon Composites with Robust Electromagnetic Wave Absorption

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Nano-Micro Letters 2025年第1期17卷 528-547页

作者： Jiaolong Liu Siyu Zhang dan qu Xuejiao Zhou Moxuan Yin Chenxuan Wang Xuelin Zhang Sichen Li Peijun Zhang Yuqi Zhou Kai Tao Mengyang Li Bing Wei Hongjing Wu Mengyang Li Bing Wei Hongjing Wu School of Physics Xidian UniversityXi’an 710071People’s Republic of China School of Advanced Materials and Nanotechnology State Key Discipline Laboratory of Wide Band Gap Semiconductor TechnologyXidian UniversityXi’an 710071People’s Republic of China School of Microelectronics Xidian UniversityXi’an 710071People’s Republic of China School of Telecommunication Engineering Xidian UniversityXi’an 710071People’s Republic of China MOE Key Laboratory of Material Physics and Chemistry Under Extraordinary School of Physical Science and TechnologyNorthwestern Polytechnical UniversityXi’an 710072People’s Republic of China The Ministry of Education Key Laboratory of Micro and Nano Systems forAerospace School of Mechanical EngineeringNorthwestern PolytechnicalUniversityXi’an 710072People’s Republic of China

Defects-rich heterointerfaces integrated with adjustable crystalline phases and atom vacancies,as well as veiled dielectric-responsive character,are instrumental in electromagnetic *** methods,however,constrain their delicate ***,an innovative alternative is proposed:carrageenan-assistant cations-regulated(CACR)strategy,which induces a series of sulfides nanoparticles rooted in situ on the surface of carbon *** unique configuration originates from strategic vacancy formation energy of sulfides and strong sulfides-carbon support interaction,benefiting the delicate construction of defects-rich heterostructures in M_(x)S_(y)/carbon composites(M-CAs).Impressively,these generated sulfur vacancies are firstly found to strengthen electron accumulation/consumption ability at heterointerfaces and,simultaneously,induct local asymmetry of electronic structure to evoke large dipole moment,ultimately leading to polarization coupling,i.e.,defect-type interfacial ***“Janus effect”(Janus effect means versatility,as in the Greek two-headed Janus)of interfacial sulfur vacancies is intuitively confirmed by both theoretical and experimental investigations for the first ***,the sulfur vacancies-rich heterostructured Co/Ni-CAs displays broad absorption bandwidth of 6.76 GHz at only 1.8 mm,compared to sulfur vacancies-free CAs without any dielectric *** defects-rich heterostructures,this one-pot CACR strategy may steer the design and development of advanced nanomaterials,boosting functionality across diverse application domains beyond electromagnetic response.

关键词： Defects-rich heterointerfaces Sulfides Polarization coupling Electromagnetic wave absorption

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A metal-free carbon dots for wastewater treatment by visible light active photo-Fenton-like reaction in the broad pH range

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Chinese Chemical Letters 2021年第7期32卷 2292-2296页

作者： Dongxue Yang dan qu Li An Xupeng Zong Zaicheng Sun Center of Excellence for Environmental Safety and Biological Effects.Beijing Key Laboratory for Green Catalysis and Separation Department of Chemistry and BiologyBeijing University of TechnologyBeijing 100124China

Carbon dots(Cdots)has been proved to possess the catalytic decomposition of H_(2)O_(2) in the photocatalytic *** is a potential photo-Fenton *** multiple emissive Cdots have different light response *** is rarely investigation on the performance of Cdots based photo-Fenton on the light ***,blue,green and red emissive carbon dots were synthesized from the different ratio of o-phenylenediamine and catechol by the solvothermal *** exhibit different light adsorption range from UV to visible ***,the photo-Fenton reactivity of Cdots was studied for catalyzing the decomposition of H_(2)O_(2) to generate free hydroxyl radicals and consequently applying for the removal of methyl *** results exhibit that Cdots with the broader light adsorption rang possess the stro nger catalytic activity for the photo-Fenton *** H_(2)O_(2) decomposition rate of red emissive Cdots is 0.074 min^(-1),which is 2.64 and 1.46 times than the blue and green emissive Cdots,*** the radical detection results confirm that the photo-Fenton happens in the *** addition,the Cdots photo-Fenton can be carried out in the broad pH range from acidic to basic solution,which has a great potential to treat wastewater in the neutral system.

关键词： Carbon dot Photo-Fenton reaction H_(2)O_(2) Visible light Wastewater treatment

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TiO2 sensitized by red-, green-, blue-emissive carbon dots for enhanced H2 production

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Rare Metals 2019年第5期38卷 404-412页

作者： Dong-Xue Yang dan qu Xiang Miao Wen-Shuai Jiang Li An Yuan-Jing Wen dan-dan Wu Zai-Cheng Sun Beijing Key Laboratory for Green Catalysis and Separation Department of Chemistry and Chemical Engineering School of Environmental and Energy Beijing University of Technology

Carbon dots(Cdots)with a broad light absorption range could be a potential stable sensitizer for TiO2,which is an excellent ultraviolet(UV)response ***,we systematically investigated the different color emissive Cdots-sensitized TiO2 for H2 ***,all kinds of Cdots enhanced the photocatalytic properties of *** the Cdots-sensitized TiO2 exhibits visible light H2 production due to their absorption in the visible light *** photocurrent and H2 production amount display strong dependence on the light absorption range of *** blue-emissive Cdots endow the weak H2 production rate due to its weak absorption in the visible *** enhanced photocatalytic activities are mainly contributed to the strong light absorbance and high-efficient charge *** light absorption of green-and red-emissive Cdots is another main factor for the high catalytic activities besides charge separation.

关键词： TiO2 Carbon dots Visible light absorption Sensitizer H2 production

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Performance and fouling mechanism of direct contact membrane distillation(DCMD) treating fermentation wastewater with high organic concentrations

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Journal of Environmental Sciences 2018年第3期30卷 253-261页

作者： Yan Wu Yun Kang Liqiu Zhang dan qu Xiang Cheng Li Feng Beijing Key Lab for Source Control Technology of Water Pollution College of Environmental Science and Engineering Beijing Forestry University

In this study,direct contact membrane distillation（DCMD）was used for treating fermentation wastewater with high organic *** performance characteristics including permeate flux,permeate water quality as well as membrane fouling were investigated *** results showed that,after 12 hr DCMD,the feed wastewater was concentrated by about a factor of 3.7 on a volumetric basis,with the permeate flux decreasing from the initial 8.7 L/m^2/hr to the final 4.3 L/m^2/hr due to membrane fouling;the protein concentration in the feed wastewater was increased by about 3.5 times and achieved a value of 6178 mg/L,which is suitable for *** COD and TOC in permeate water increased continuously due to the transfer of volatile components from wastewater,organic rejection of over 95%was achieved in ***–MS results suggested that the fermentation wastewater contained 128kinds of organics,in which 14 organics *** 12 hr DCMD,not only volatile organics including trimethyl pyrazine,2-acetyl pyrrole,phenethyl alcohol and phenylacetic acid,but also non-volatile dibutyl phthalate was detected in permeate water due to membrane ***-IR and SEM–EDS results indicated that the deposits formed on the membrane inner surface mainly consisted of Ca,Mg,and amine,carboxylic acid and aromatic *** fouled membrane could be recovered,as most of the deposits could be removed using a HCl/Na OH chemical cleaning method.

关键词： Fermentation wastewater Direct contact membrane distillation Membrane fouling

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High heat loading performance of actively cooled W/Cu FGM-based components

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International Journal of Minerals,Metallurgy and Materials 2011年第4期18卷 467-471页

作者： Zhang-jian Zhou Jun Tan dan-dan qu Hua Li Young-jin yum Hyun-woo Lim School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Electronic Engineering Institute Hefei 230037 China School of Mechanical ＆ Automotive Engineering University of Ulsan Ulsan 680-749 Korea

A functionally graded material-based actively water-cooled tungsten-copper mockup with a dimension of 30 mm×30 mm×25 mm was designed and fabricated by infiltration-brazing *** thicknesses of the pure W layer and W/Cu graded layer were 2 and 3 mm,*** heat flux tests were performed on the mockup using an e-beam *** is no damage occurring on the joint after heat loading at 5 MW/*** temperature on the pure W surface is less than 500°C after irradiation for 100 s at 5 MW/m2,while the temperature on the brazing seam/copper surface is around 200°C.

关键词： tungsten copper functionally graded materials thermal load

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Tailoring color emissions from N-doped graphene quantum dots for bioimaging applications

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Light(Science & Applications) 2015年第1期4卷 8-15页

作者： dan qu Min Zheng Jing Li Zhigang Xie Zaicheng Sun State Key Laboratory of Luminescence and Applications Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesNo.3888 Dong Nanhu RoadChangchun 130033China University of Chinese Academy of Sciences No.19AYuquan RoadBeijing 100049China State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesNo.5625Renmin StreetChangchun 130022China Beijing Key Laboratory for Green Catalysis and Separation Department of Chemistry and Chemical EngineeringBeijing University of Technology100 PingleyuanChaoyang DistrictBeijing 100124China

Unlike inorganic quantum dots,fluorescent graphene quantum dots(GQDs)display excitation-dependent multiple color *** this study,we report N-doped GQDs(N-GQDs)with tailored single color emission by tuning p-conjugation degree,which is comparable to the inorganic quantum *** from citric acid and diethylenetriamine,as prepared N-GQDs display blue,green,and yellow light emission by changing the reaction solvent from water,dimethylformamide(DMF),and solvent *** X-ray photoelectron spectroscopy,ultraviolet-visible spectra results clearly show the N-GQDs with blue emission(N-GQDs-B)have relatively short effective conjugation length and more carboxyl group because H_(2)O is a polar protic solvent,which tends to donate proton to the reagent to depress the H_(2)O elimination *** the other hand,the polar aprotic solvent(DMF)cannot donate hydrogen,the elimination of H_(2)O is promoted and more nitrogen units enter GQD *** the increase of effective p-conjugation length and N content,the emission band of N-GQDS red-shifts to green and *** also demonstrate that N-GQDs could be a potential great biomarker for fluorescent bioimaging.

关键词： excitation wavelength independent graphene quantum dots nitrogen doped pure color emission

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Removal of Pb(Ⅱ) from aqueous solution by hydrous manganese dioxide:Adsorption behavior and mechanism

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Journal of Environmental Sciences 2013年第3期25卷 479-486页

作者： Meng Xu Hongjie Wang Di Lei dan qu Yujia Zhai Yili Wang College of Environmental Science and Engineering Beijing Forestry University Beijing Key Lab for Source Control Technology of Water Pollution

Hydrous manganese dioxide （HMO） synthesized by redox of potassium permanganate and hydrogen peroxide was used as an adsorbent for Pb（Ⅱ） *** specific surface area,pore volume and BJH pore diameter of the HMO were 79.31m2/g,0.07cm3/g and 3.38 nm,*** adsorption equilibrium at 298K could be well described by the Langmuir isotherm equation with q max value of 352.55mg/*** negative values of G and the positive values of H and S indicated the adsorption process was spontaneous and *** pseudo second-order equation could best fit the adsorption *** value of the calculated activation energy for Pb（Ⅱ） adsorption onto the HMO was 38.23 kJ/*** uptake of Pb（Ⅱ） by HMO was correlated with increasing surface hydroxyl group content and the main adsorbed speciation was PbOH＋.The final chemical state of Pb（Ⅱ） on the surface of HMO was similar to *** was a promising candidate for Pb（Ⅱ） removal from aqueous solution.

关键词： adsorption mechanism heavy metal manganese dioxide

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The critical factors of photocatalytic H2 production from seawater by using TiO_(2)as photocatalyst

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Nano Research 2023年第4期16卷 4620-4624页

作者： Yaqian He Pengfei Li Wenning Liu Li An dan qu Xiayan Wang Zaicheng Sun Beijing Key Laboratory for Green Catalysis and Separation Center of Excellence for Environmental Safety and Biological EffectsFaculty of Environment and LifeBeijing University of TechnologyBeijing 100124China

The solar H_(2)generation directly from natural seawater is a sustainable way of green ***,it is limited by a low H_(2)generation rate even compared to fresh *** this report,TiO_(2)is chosen as a model photocatalyst to disclose the critical factor to deteriorate the H_(2)generation rate from *** simulated seawater(SSW),which is composed of eight ions(Na^(+),K^(+),Ca^(2+),Mg^(2+),Cl^(−),Br^(−),SO_(4)^(2−),and CO_(3)^(2−)),is investigated the effect of each ion on the H_(2)*** results indicate that all ions have a negative effect at the same concentration as in the seawater except Br−.The CO_(3)^(2−)has the most serious deterioration,and the H_(2)production rate lowers near 40%even at[CO_(3)^(2−)]of 1.5 mmol·L^(−1).The H_(2)production rate can be recovered to 85%if the CO_(3)^(2−)is excluded from the *** understand the reason,the zeta potential of the TiO_(2)treated with different ions aqueous solution reveals that the zeta potential decreases when it is treated with CO_(3)^(2−)and SO_(4)^(2−)due to they can adsorb on the surface of TiO_(2)*** transform infrared(FTIR)and thermogravimetric analysis-mass spectroscopy(TGA-MS)further confirm that the adsorbed ion is mainly from CO_(3)^(2−).Since the pH of seawater is about 8.9 between pKa1(6.37)and pKa2(10.3)of H_(2)CO3,the CO_(3)^(2−)should exist in the form of HCO3−in the *** proposed a simple method to remove the adsorbed HCO3−from the TiO_(2)surface by adjusting the pH below the *** results indicate that if a trace amount of HCl(adjusting pH~6.0)is added to the SSW,the H_(2)production rate can be recovered to 85%of that in pure water.

关键词： seawater H_(2)production rate adsorb ions pH

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Fe_(2)Mo_(3)O_(8)/XC-72 electrocatalyst for enhanced electrocatalytic nitrogen reduction reaction under ambient conditions

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Nano Research 2022年第7期15卷 5940-5945页

作者： Guohua Liu Lijuan Niu Zhixue Ma Li An dan qu dandan Wang Xiayan Wang Zaicheng Sun Beijing Key Laboratory for Green Catalysis and Separation Center of Excellence for Environmental Safety and Biological EffectsFaculty of Environment and LifeBeijing University of TechnologyBeijing 100124China Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education Jilin Normal UniversityChangchun 130103China

To perform the electrochemical nitrogen reduction reaction(NRR)under milder conditions for sustainable ammonia production,electrocatalysts should exhibit high selectivity,activity,and ***,the key restrictions are the highly stable N≡N triple bond and the competitive hydrogen evolution reaction(HER),which make it difficult to adsorb and activate N2 on the surface of electrocatalysts,leading to a low ammonia yield and Faraday *** by the enzymatic nitrogenase process and using the Fe-Mo as the active center,here we report supported Fe_(2)Mo_(3)O_(8)/XC-72 as an effective and durable electrocatalyst for the ***_(2)Mo_(3)O_(8)/XC-72 exhibited NRR activity with an NH3 yield of 30.4μg·h^(−1)·mg^(−1)(−0.3 V)and a Faraday efficiency of 8.2%(−0.3 V).Theoretical calculations demonstrated that the electrocatalytic nitrogen fixation mechanism involved the Fe atom in the Fe_(2)Mo_(3)O_(8)/XC-72 electrocatalyst acting as the main active site in the enzymatic pathway(*NH2→*NH3),which activated nitrogen molecules and promoted the NRR performance.

关键词： nitrogen reduction reaction(NRR) Fe_(2)Mo_(3)O_(8)/XC-72 electrocatalyst density functional theory calculations

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Preparation of Ag-MnFe204-bentonite Magnetic Composite for Pb（II）/Cd（II） Adsorption Removal and Bacterial Inactivation in Wastewater

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Chemical Research in Chinese Universities 2018年第5期34卷 808-816页

作者： LI Qin ZHAO Yongsheng qu dan WANG Haoying CHEN Jin ZHOU Rui Key Laboratory of Groundwater Resources and Environment Ministry of Education Jilin Provincial Key Laboratory of Water Resource and EnvironmentCollege of New Energy and Environment Jilin University Changchun 130021 P. R. China Baohang Enrironment Company Limited Beijing 100107 R. R China

An Ag-MnFe2O4-bentonite composite was synthesized by a chemical co-precipitation method and used for adsorption removal of Pb（II）, Cd（II） and disinfection. The result of X-ray diffraction indicate that the diffraction peaks of MnFe2O4 and Ag can be perfectly indexed to the cubic spinel MnFe2O4（JCPDS No.88-1965） and metallic Ag（JCPDS No.41-1402）, respectively. The results of scanning electron microscopy and energy dispersive X-ray spectroscopy manifest the deposition of MnFe2O4 and Ag on the bentonite surface and the presence ofMn, Fe and Ag. The result of X-ray photoelectron spectroscopy displayed that the composition of Ag-MnFe2O4-bentonite was Mn（II）, Fe（III） and metallic Ag. The analysis of Brunauer-Emmett-Teller showed that the specific surface area of Ag-MnFe2O4-bentonite was the largest compared with that of bentonite, MnFe2O4 and MnFe2O4-bentonite. Thermo- dynamic studies revealed that the adsorption of Pb（II） and Cd（II） ions was spontaneous and endothermic. Langmuir model showed an adsorption capacity of 129.87 mg/g for Pb（II） and 48.31 mg/g for Cd（II） ions. The adsorption ki- netics of Pb（II） and Cd（II） ions onto Ag-MnFe2O4-bentonite can be best described by a pseudo-second-order model. The adsorption rate constant of the pseudo-second-order model was 0.0019 g·mg^-1·min^-1 for Pb（II） and 0.0065 g·mg^-1·min^-1 for Cd（II） ions. In addition to the adsorption experiment, the antibacterial properties of Ag-MnFe2O4-bentonite were studied through plate count method. Gram-negative（G-） bacteria Escherichia coli and Gram-positive（G＋） bacteria Lactobacillus plantarum were used to test the antibacterial properties. The results showed that the composite demonstrated excellent antibacterial activity. Thus, Ag-MnFe2O4-bentonite can be em- ployed as an adsorbent as well as an antimicrobial agent.

关键词： Ag-MnFe2O4-bentonite Adsorption Heavy metal ion Bacterial inactivation Wastewater treatment

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