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A green cross-linking method for the preparation of renewable threedimensional graphene sponges for efficient adsorption of Congo red dye

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Chinese Journal of Chemical Engineering 2024年第2期66卷 84-93页

作者： Zhuang Liu Bo Gao Haoyuan Han Yuling Li Haiyang Fu donghui wei Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education) Northeastern UniversityShenyang 110819China

Graphene-based materials possess significant potential for the treatment of dye wastewater due to their exceptional adsorption properties toward stubborn ***,their utilization is hindered by high preparation costs,low yields,environmental pollution during synthesis,and challenges in regenerating the *** study proposes a novel approach to address these limitations by developing nitrogen-doped three-dimensional(3D)polyvinyl alcohol(PVA)crosslinked graphene sponges(N-PGA)using a cross-linking method with ammonium *** method offers a relatively mild,environmentally friendly *** carbonate serves as both a reducing and modifying agent,facilitating the formation of the intrinsic structure of N-PGA and acting as a nitrogen ***,PVA is utilized as the cross-linking *** results demonstrate that N-PGA exhibits a favorable internal 3D hierarchical porous structure and possesses robust mechanical *** measured specific surface area(BET)of N-PGA was as high as406.538 m^(2)·g^(-1),which was favorable for its efficient adsorption of Congo red(CR)dye *** an initial concentration of 50 mg·L^(-1),N-PGA achieved an impressive removal rate of 89.6%and an adsorption capacity of 112 mg·g^(-1)for CR ***,it retained 79%of its initial adsorption capacity after 10 cycles,demonstrating excellent regeneration *** summary,the synthesized N-PGA displays remarkable efficacy in the adsorption of CR dye in wastewater,opening up new possibilities for utilizing 3D porous graphene nanomaterials as efficient adsorbents in wastewater treatment.

关键词： Green chemistry Graphene sponge Adsorbents Adsorption Congo red Regeneration

Desymmetrization of Cyclic 1,3-Diketones under N-Heterocyclic Carbene Organocatalysis:Access to Organofluorines with Multiple Stereogenic Centers

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Research 2021年第1期2021卷 1495-1507页

作者： Guanjie Wang Min Zhang Yezhi Guan Ye Zhang Xianfang Hong Chenlong wei Pengcheng Zheng donghui wei Zhenqian Fu Yonggui Robin Chi wei Huang Key Laboratory of Flexible Electronics(KLOFE)&Institute of Advanced Materials(IAM)Nanjing Tech University(NanjingTech) 30 South Puzhu RoadNanjing 211816China College of Chemistry and Green Catalysis Center Zhengzhou UniversityZhengzhouHenan 450001China School of Chemistry and Molecular Engineering Nanjing Tech University(NanjingTech)30 South Puzhu RoadNanjing 211816China Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering Key Laboratory of Green Pesticide and Agricultural BioengineeringMinistry of EducationGuizhou UniversityHuaxi DistrictGuiyang 550025China Division of Chemistry&Biological Chemistry School of Physical&Mathematical SciencesNanyang Technological UniversitySingaporeSingapore 637371 Frontiers Science Center for Flexible Electronics(FSCFE)&Shaanxi Institute of Flexible Electronics(SIFE) Northwestern Polytechnical University(NPU)127 West Youyi RoadXi’an 710072China

Symmetric 1,3-diketones with fluorine or fluorinated substituents on the prochiral carbon remain to be ***,we have developed a novel prochiral fluorinated oxindanyl 1,3-diketone and successfully applied these substrates in carbene-catalyzed asymmetric ***,a versatile strategy for asymmetric generation of organofluorines with fluorine or fluorinated methyl groups has been *** stereogenic centers were selectively constructed with satisfactory *** diverse enantioenriched organofluorines were generated with excellent results in terms of yields,diastereoselectivities,and ***,exchanging fluorinated methyl groups to fluorine for this prochiral 1,3-diketones leads to switchable *** aspects and origin of stereoselectivity were studied by DFT ***,some of the prepared organofluorines demonstrated competitive antibacterial activities.

关键词： fluorine chiral asymmetric

Formation process and properties of hydrogen-producing granular sludge in UASB reactor

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International Journal of Agricultural and Biological Engineering 2018年第5期11卷 224-229页

作者： Lili Yin Shuang Liu Mengyi Wang Wencong Ju donghui wei Wenzhe Li College of Engineering Northeast Agricultural UniversityHarbin 150030China

The granular sludge of microbial fermentation systems includes various biomass-degrading enzymes and different microflora,which have significant impacts on the degradation of biomass and the stability of the *** up-flow anaerobic sludge blanket(UASB)reactor was used to grow hydrogen-producing granular *** results showed that the formation of the granular sludge underwent four stages,i.e.,flocculation of the sludge,formation of the flocculent sludge,swelling of the flocculent sludge,and formation of the granular *** formed granular sludge mostly had regular spherical and ellipsoidal shapes with a fractal dimension of 2.08±0.4;the settling velocities were 0.84 cm/s to 1.96 cm/s in water,the porosity was *** shear sensitivity(Kss)of the granular sludge was *** granular sludge had a culture cycle of approximately 70 d and a hydrogen yield of 1.09 mol H2/mol glucose.

关键词： anaerobic fermentation UASB reactor granular sludge hydrogen

High-efficiency organic solar cells enabled by an alcohol-washable solid additive

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Science China Chemistry 2021年第12期64卷 2161-2168页

作者： Yuanpeng Xie Hwa Sook Ryu Lili Han Yunhao Cai Xiaopeng Duan donghui wei Han Young Woo Yanming Sun School of Chemistry Beihang UniversityBeijing100191China Department of Chemistry College of ScienceKU-KIST Graduate School of Converging Science and TechnologyKorea UniversitySeoul136-713Korea College of Chemistry and Molecular Engineering Zhengzhou UniversityZhengzhou450001China

The solvent additive strategy has been widely utilized to boost the power conversion efficiency(PCE)of organic solar cells(OSCs).However,the residual solvent additive in the active layer tends to induce a gradual morphology degradation and further influences the long-term stability of ***,a solid additive,1,4-diiodobenzene(DIB),was introduced to fabricate efficient *** found that the treatment of DIB can lead to optimized morphology to form a bicontinuous network with intensified intermolecular packing in the donor and acceptor ***,DIB can be easily removed from the active layer via a simple alcohol washing process and no further post-thermal annealing is needed,which is desirable for large-scale manufacturing of *** a result,high efficiencies of 17.47%for PM6:Y6 and 18.13%(certified as 17.7%)for PM6:BTP-eC9 binary OSCs are achieved,which are among the highest efficiencies reported for binary OSCs thus ***,OSCs fabricated with DIB also exhibit superior stability compared with the as-cast and traditional solvent additive processed ***,DIB was successfully applied in different active layers,manifesting its general *** work provides a feasible approach to enhance both the efficiency and stability of OSCs.

关键词： organic solar cells solid additive alcohol washing process efficiency stability

In-situ observation and mechanism of calcium–magnesium–alumina–silicate(CMAS)melts-induced degradation of RE_(2)SiO_(5)(RE=Tb,Dy,Ho,Y,Er,Tm,and Yb)ceramics at 1500℃

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Journal of Advanced Ceramics 2023年第12期12卷 2315-2330页

作者： Zhilin Tian Keyu Ming Liya Zheng Zhilin Chen Fan Zhou Peng Liu Zihao Qiu donghui wei Bin Li Jingyang Wang School of Materials Shenzhen Campus of Sun Yat-sen UniversityShenzhen 518107China School of Metallurgy Northeastern UniversityShenyang 110819China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

Rare earth(RE)silicate is one of the most promising environmental barrier coatings for silicon-based ceramics in gas turbine ***,calcium-magnesium-alumina-silicate(CMAS)corrosion becomes much more serious and is the critical challenge for RE silicate with the increasing operating ***,it is quite urgent to clarify the mechanism of high-temperature CMAS-induced degradation of RE silicate at relatively high ***,the interaction between RE_(2)SiO_(5) and CMAS up to 1500℃was investigated by a novel high temperature in-situ observation *** temperature promotes the growth of the main reaction product(Ca_(2)RE_(8)(SiO_(4))6O_(2))fast along the[001]direction,and the precipitation of short and horizontally distributed Ca_(2)RE_(8)(SiO_(4))6O_(2) grains was accelerated during the cooling *** increased temperature increases the solubility of RE elements,decreases the viscosity of CMAS,and thus elevates the corrosion reaction rate,making RE_(2)SiO_(5) fast interaction with CMAS and less affected by RE element species.

关键词： calcium-magnesium-alumina-silicate(CMAS)corrosion environmental barrier coating rare earth(RE)silicate high temperature

A combined experimental and computational study of NHC-catalyzed allylation of allenoate with MBH esters:new regiospecific and stereoselective access to 1,5-enyne

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Organic Chemistry Frontiers 2022年第1期9卷 51-57页

作者： Fang Sun Fangfang Lu Xue Song Wenchao Wu Kai Zhang Chenxia Yu Tuanjie Li donghui wei Changsheng Yao Jiangsu Key Lab of Green Synthetic Chemistry for Functional Materials School of Chemistry and Materials ScienceJiangsu Normal UniversityXuzhouJiangsu 221116P R China. The College of Chemistry and Molecular Engineering Zhengzhou University100 Science AvenueZhengzhouHenan 450001P R China

An NHC-catalyzed regiospecific allylation ofα-substituted allenoates with MBH carbonates derived from aryl aldehyde furnished highly functionalized 1,5-enynes bearing a quaternary carbon *** with DFT calculations,the reaction mechanism of this conversion was *** method has the advantages of high regioselectivity,good yields and mild reaction *** transformation not only provided a new access to 1,5-enyne,but also enriched the chemistry of allenoates and NHC catalysis.

关键词： conditions catalysis allyl

Organic solar cells based on chlorine functionalized benzo[1,2-b:4,5-b′]difuran-benzo[1,2-c:4,5-c′]dithiophene-4,8-dione copolymer with efficiency exceeding 13%

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Science China Chemistry 2020年第4期63卷 483-489页

作者： Linglong Ye Xueshan Li Yunhao Cai Hwa Sook Ryu Guangkai Lu donghui wei Xiaobo Sun Han Young Woo Songting Tan Yanming Sun School of Chemistry Beihang UniversityBeijing 100191China Department of Chemistry College of ScienceKorea UniversityAnam-ro 145Seongbuk-guSeoul 136-713Republic of Korea The College of Chemistry and Molecular Engineering Zhengzhou UniversityZhengzhou 450001China Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education College of ChemistryXiangtan UniversityXiangtan 411105China

Benzo[1,2-b:4,5-b′]dithiophene(BDT) has been widely used to construct donor-acceptor(D-A) copolymers in organic solar cells(OSCs). However, benzo[1,2-b:4,5-b′]difuran(BDF), an analogue of BDT, has received less attention than BDT. The photovoltaic performance of BDF copolymers has lagged behind that of BDT copolymers. Here, we designed and synthesized two BDF copolymers, PBF1-C and PBF1-C-2Cl. PBF1-C-2Cl, which is composed of BDF and benzo[1,2-c:4,5-c′]dithiophene-4,8-dione connected by a chlorinated thiophene π-bridge, displays a low-lying highest occupied molecular orbital energy level,which helps in yielding a high open-circuit voltage(Voc) in OSCs. As a result, when blended with Y6, PBF1-C-2Cl-based devices showed a high Voc of 0.83 V and a power conversion efficiency(PCE) of 13.10%. To the best of our knowledge, the PCE of 13.10% is among the highest efficiency values for OSCs based on BDF copolymers.

关键词： organic solar cells benzo[1,2-b,5-b′]difuran benzo[1,2-c,5-c′]dithiophene-4,8-dione chlorinated thiophene π-bridge

Size effect of lead-free halide double perovskite on luminescence property

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Science China Chemistry 2019年第10期62卷 1405-1413页

作者： Peigeng Han Xue Zhang Xin Mao Bin Yang Songqiu Yang Zha Zhochi Feng donghui wei weiqiao Deng Tonu Pullerits Keli Han State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical PhysicsChinese Academy of ScienceDalian 116023China University of the Chinese Academy of Sciences Beijing 100049China Institute o f Molecular Sciences and Engineering Shandong UniversityQingdao 266237China Department of Chemical Physics and NanoLund Chemical CenterLund University22100 LundSweden State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of ScienceDalian 116023China College of Chemistry and Molecular Engineering Zhengzhou UniversityZhengzhou 450001China

Lead-free halide double perovskites have gathered wide scientific interest since they are environmentally friendly and ***,compared to the lead perovskites,their optoelectronic properties are *** we report a series of... 详细信息

关键词： double perovskite bulk crystals warm white size effect stability

Selective synthesis of the B_(11)H_(14)^(-) and B_(12)H_(12)^(2-) borane derivatives and the general mechanisms of the B-H bond condensation

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Science China Chemistry 2024年第3期67卷 876-881页

作者： Yi Jing Xinghua Wang Hui Han Xin-Ran Liu Xing-Chao Yu Xi-Meng Chen donghui wei Lai-Sheng Wang Xuenian Chen College of Chemistry Green Catalysis CenterZhengzhou UniversityZhengzhou 450001China School of Chemistry and Chemical Engineering Henan Key Laboratory of Boron Chemistry and Advanced Energy MaterialsHenan Normal UniversityXinxiang 453007China Department of Chemistry Brown UniversityProvidenceRI 02912USA

Polyhedral boranes are a class of well-known boron molecular clusters with unique physical and chemical properties,and great efforts have been made in the past decades to find more effective synthetic ***,the established synthetic methods suffer from low efficiency and low selectivity because the mechanism of the B-H bond condensation reaction,critical for the synthesis of the polyhedral boranes,is not well *** we report highly selective and efficient synthetic methods of the salts of the tetradecahydridoundecaborate(1-)(B_(11)H^(-)_(14)) and dodecahydrido-dodecaborates(2-)(B_(12)H_(12)^(2-)) anions by employing commercially available and inexpensive starting *** theoretical and experimental investigations are carried out to elucidate the reaction *** have found that the nature of the B-H bond condensation is the dihydrogen bonding interaction in which the positively charged hydrogens(bridged hydrogens) play a crucial *** current study has not only led to more effective and selective synthetic methods for B_(11)H^(-)_(14) and B_(12)H_(12)^(2-) but also unveiled the nature of the B-H bond condensation and the general formation mechanisms of polyhedral *** finding will facilitate the development of more effective synthetic methods for polyhedral boranes and spur their wide application.

关键词： Boranes polyhedral boranes dihydrogen bond nucleophilicity