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Comparative Study of the Efficacy of Metal Removal from Contaminated Aqueous Solutions by Solid Bidentate ligands&Liquid Plant Materials

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Journal of Environmental Science and Engineering(A) 2024年第2期13卷 45-49页

作者： Lovell Agwaramgbo Talajai Sardin Christopher Alisa Chemistry Department Dillard UniversityNew OrleansLA 70122USA Biology Department Dillard UniversityNew OrleansLA 70122USA Chemistry Department Federal University of Technology OwerriPMB 1526OwerriNigeria

Heavy metal contaminated water sources pose serious health risks for humans,animals,and *** to and ingestion of heavy metals have been associated to liver,kidney,and brain ***:The aim of this research is to comparatively examine the metal removal efficacy of three solid bidentate chemicals and four plant *** Design&Methods:Standard solutions of zinc(II)and lead(II)ions with concentrations of 1,000 ppm were respectively treated with OA(Oxalic Acid),dibasic bidentate ligands(sodium hydrogen phosphate and sodium carbonate).Then,the solutions were placed on a shaker for 15 h,centrifuged,and the supernatant was analyzed using ICP-AES(Inductively Coupled Plasma-Atomic Emission Spectrometry).Results:All the solid bidentate adsorbents were very effective in removing zinc and lead(>90%).However,more lead than zinc was removed across all adsorbents except for lemon where equal percent of zinc and lead(49%)were *** and Na2HPO4 removed about equal amount of lead(>99%).The plant materials(SP(Spinach),bell pepper and GBP(Green Bell Pepper)),respectively and preferentially removed more lead(98.9%,98.3%,81.5%)than zinc(91.7%,46%,46%).Conclusion:Although plant materials have gained attraction for the remediation of heavy metal,however,some bidentate chemical ligands such as OA,sodium carbonate and sodium hydrogen phosphates are even more effective in removing these metals from contaminated ***,heavier metals are preferentially removed than lighter metals.

关键词： Organic acids OA remediation chelation ligands heavy metal contamination

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Recent progress in quasi-two-dimensional and quantum dot perovskite light-emitting diodes harnessing the diverse effects of ligands:A review

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Nano Research 2022年第7期15卷 6449-6465页

作者： Yurim Bae Jun Ryu Saemon Yoon Dong-Won Kang School of Energy Systems Engineering Chung-Ang UniversitySeoul 06974Republic of Korea Department of Smart City Chung-Ang UniversitySeoul 06974Republic of Korea

Halide perovskites have been extensively studied for use as light-emitting diodes(LEDs)in next-generation displays due to their beneficial characteristics,including their high color purity and wide color *** perovskites can be categorized into four representative structures:three-dimensional(3D)bulk,two-dimensional(2D),quasi-two-dimensional(quasi-2D),and quantum dot(QD).Recently,excellent advances in the performance of perovskite LEDs(PeLEDs),especially those with quasi-2D and QD architectures,have been demonstrated with the incorporation of organic chain *** can both modify the structure of PeLEDs,such as forming multi-quantum wells in quasi-2D PeLEDs and essential passivation layers in QD PeLEDs,and also enhance their optical *** appropriate use of ligands in PeLEDs can thus lead to greater luminescence,current efficiency,power efficiency,and external quantum *** this review,the principal roles of ligands in quasi-2D and QD PeLEDs are systematically ***,current limitations and future perspectives are discussed in detail.

关键词： perovskites light emitting diode ligands quasi-two-dimensional(quasi-2D) quantum dot

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Unidirectionally aligned bright quantum rods films,using T-shape ligands,for LCD application

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Nano Research 2022年第6期15卷 5392-5401页

作者： Maksym F.Prodanov Chengbin Kang Swadesh K.Gupta Valerii V.Vashchenko Yuhao Li Minchao Qin Xinhui Lu Abhishek K.Srivastava State Key Laboratory of Advanced Displays and Optoelectronics Technologies and Centre for Display Research Department of Electronics and Computer EngineeringThe Hong Kong University of Science and TechnologyClear Water BayHong Kong 999077Hong KongChina Department of Physics The Chinese University of Hong KongShatinHong Kong 999077Hong KongChina

Unidirectionally aligned nanorods(NRs)are of great importance for different applications,including displays,lighting,and ***,many alignment techniques were studied to align quantum rods(QRs).However,the brightness of these films,due to the limited concentration of aligned quantum rods in the film,is not enough for their implementation as brightness enhancement films(BEFs)in *** can be ascribed to the poor miscibility of quantum rods in polymer and strong concentration dependence of the polarized *** ligands of NR are very important for the alignment and *** this article,we proposed a ligand combination comprising T-shape promesogenic phosphonic acid,which on being photoaligned provides mutually parallel alignment of the quantum *** T-shape ligands enable the fabrication of hybrid films with a QRs concentration as high as 10 wt.%–20 wt.%retaining high brightness and luminescence polarization ***,we used these films in the in-plane switching(IPS)display backlight that shows the color gamut up to 121%of national television system committee(NTSC)(CIE1931),liquid-crystal display(LCD)efficiency up to 7.9%,power efficacy 103±2 nits/W,and the high brightness of~550±10 ***,the proposed ligands can be used for the alignment of a variety of nanorods.

关键词： quantum rods(QRs) ligands alignment display luminous efficiency

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Axial ligands tailoring the ORR activity of cobalt porphyrin

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Science Bulletin 2019年第16期64卷 1158-1166页

作者： Yue Zhou Yong-Fang Xing Jing Wen Hai-Bo Ma Feng-Bin Wang Xing-Hua Xia School of Chemistry and Chemical Engineering Nanjing University

In an effort to provide visualization and understanding to the electronic ‘‘push effect' of axial ligands on the catalytic activity of cobalt macrocyclic molecules, we design a simple model system involving an[5,10,15,20-tetrakis(4-methoxyphenyl)porphyrin]cobalt(II)(TMMPCo) monolayer axially-coordinated on thiol ligand modified Au electrode and explore the activity of the axial-ligand coordinated TMPPCo toward oxygen reduction reaction(ORR) in acidic medium. Three different ligands, with a decreasing order of coordinating ability as: 4-mercaptopyridine(MPy) > 4-aminothiolphenol(APT) > 4-mercaptobenzonitrile(MBN) are used and a maximum difference in ORR onset potential of 80 mV is observed between the MPy(highest onset potential) and MBN systems(lowest onset potential). The ORR activity of TMPPCo increases with the increase in binding strength of the axial ligand. A detailed mechanism study reveals that ORR on the three ligand coordinated TMPPCo systems shares the same2-electron mechanism with H2 O2 as the terminal product. Theoretical calculation into the structure of the ligand coordinated cobalt porphyrins uncovers the variation in atomic charge of the Co(II) center and altered frontier molecular orbital distribution among the three ligand systems. Both properties have great influence on the back-bonding formation between the Co(II) center and O2 molecules, which has been suggested to be critical toward the O2 adsorption and subsequent activation process.

关键词： Oxygen reduction reaction(ORR) Cobalt porphyrin Axial ligands Push effect

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Highly luminescent and stable CsPbBr3 perovskite quantum dots modified by phosphine ligands

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Nano Research 2019年第4期12卷 785-789页

作者： Yan Li Xiaoyan Wang Weinan Xue Wei Wang Wei Zhu Lianjing Zhao Key Laboratory far Advanced Materials Shanghai Key Laboratory of Functional Materials Chemistry School of Chemistry and Molecular Engineering East China University of Science and Technology Shanghai 200237 China

All-inorganic cesium lead halide perovskite quantum dots (QDs) have been a promising candidate for optoelectronic devices in recent years,such as light-emitting diodes,photodetectors and solar cells,owing to their superb optoelectronic ***,the stability issue of nanocrystals is a bottleneck for their practical ***,we report a facile method for the synthesis of a series of phosphine ligand modified CsPbBr3 QDs with high PL *** introducing organic phosphine ligands,the tolerance of CsPbBr3 QDs to ethanol,water and UV light was dramatically ***,the phosphine ligand modified QD films deposited on the glass subtracts exhibit superior PL intensity and optical stability to those of pristine QD based films.

关键词： perovskite quantum dots organic phosphine ligands optical and structure stability

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Construction of NIR luminescent nanoscale lanthanide complexes with new flexible Schiff base ligands

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Journal of Rare Earths 2020年第2期38卷 143-147页

作者： Bichen Yuan Junbin Tao Fei Wang Chaoqun Zhu Min Li Xiaoping Yang Zhejiang Key Laboratory of Carbon Materials College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325035China

Four mono-and bi-nuclear lanthanide complexes [LnL1(No3)(H2O)DMF](Ln=Nd(1) and Yb(2)) and[Ln2(L2)2(OAc)2](Ln=Nd(3) and Yb(4)) were synthesized by using two new Schiff base ligands with long(CH2)2 NH(CH2)2 *** lengths of the Schiff base ligands are about 1.8 *** bi-nuclear lanthanide complexes 3 and 4 have nanoscale structures with sizes of approximately 0.7 nm×1.1 nm×1.6 *** 3,the molar ratio of Nd:Br:O obtained by the energy dispersive X-ray spectroscopy analysis is in agreement with the crystal *** chromogenic Schiff base ligands in1-4 can efficiently transfer energy to lanthanide ions,thus,these complexes exhibit the typical NIR luminescence of lanthanide ***,3 and 4 have higher NIR emission quantum yields(Φem)than 1 and 2,respectively.

关键词： Construction Schiff base ligands Lanthanide complexes Nanoscale structures NIR luminescence Rare earths

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Two Zinc Complexes Supported by in situ Formed Etheric ligands

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Chinese Journal of Structural Chemistry 2019年第9期38卷 1593-1599页

作者：杨乐刘勇路张恩生陈小莉高楼军杨华 Laboratory of New Energy&New Function Materials Shaanxi Key Laboratory of Chemical Reaction EngineeringCollege of Chemistry and Chemical EngineeringYan’an UniversityShaanxi716000China College of Chemistry and Chemical Engineering Xi’an University of Science and TechnologyXi’an710054China College of Chemistry Chemical Engineering and Materials ScienceSoochow UniversitySuzhou215123China

Two zinc complexes, [Zn(MPIP)Cl2](1) and [Zn(EPIP)Cl2](2), where MPIP = 1-(methoxymethyl)-3-(pyridin-2-yl)imidazo[1,5-a]pyridine and EPIP = 1-(ethoxymethyl)-3-(pyridin-2-yl)imidazo[1,5-a]pyridine, were synthesized under solvothermal conditions. The etheric ligand MPIP was formed in situ via metal ligand reaction between(3-(pyridin-2-yl)imidazo[1,5-a]pyridin-1-yl)methanol(HPIPM) and methanol solvent. Similarly, the ligand EPIP was generated in situ from the reaction of HPIPM with ethanol solvent. The structures of 1 and 2 were characterized by X-ray single-crystal diffraction analysis. They are four-coordinated mononuclear complexes, and the ZnII ion of 1 and 2 displays distorted tetrahedral geometry. The photoluminescent properties of 1 and 2 were investigated. Strong emissions were observed for both 1 and 2, which were ascribed as the intraligand(π-π*) fluorescent transitions. This paper provides a simple and efficient method for the synthesis of etheric compounds.

关键词： zinc complexes in situ reactions etheric ligands photoluminescent property

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Flexible Bis(benzimidazole)-based ligands Directed the Structure Characteristics of Coordination Polymers Based on Diphenic Acid Co-ligands:Syntheses, Structures and Properties

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Chinese Journal of Structural Chemistry 2019年第1期38卷 155-164,5页

作者：屠长征杨玉亭许丽丽晏帮领汪帆 College of Chemistry and Environmental Science Qujing Normal University

Two new coordination polymers [Cu_2(bbim)(dpa)_2(C_2H_5OH)_2](1), [Co(dpa)_2(bbbm)](2)(H_2dpa = diphenic acid, bbim = 1,1?-(1,6-hexanediyl)bis-1H-benzimidazole, bbbm = 1,1?-(1,4-butanediyl)bis-1 H-benzimidazole) constructed from bis(benzimidazole)-based ligands with different lengths and diphenic acid co-ligand have been synthesized under solvothermal *** 1 possesses Cu-dpa helical chains. The adjacent chains are connected by the bbim ligands into two-dimensional(2D) 3-connected(63) topology. Differently, the layer structure of 2 was consisted by one-dimensional chains containing alternated 8-and 18-membered rings. Furthermore,the thermal stability and fluorescence property for all crystalline materials have been investigated.

关键词： coordination polymer crystal structure diphenic acid bis(benzimidazole)-based ligands fluorescence

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A Series of Lanthanide-organic Frameworks Constructed by Ln_4(OH)_4 Clusters and Mixed ligands

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Chinese Journal of Structural Chemistry 2019年第1期38卷 103-108,4页

作者：顾翔宇金聪聪程建文 Key Laboratory of the Ministry of Education for Advanced Catalysis Materials Institute of Physical Chemistry Zhejiang Normal University

Three new lanthanide-organic compounds, namely, [Ln_2(OH)_2(oba)(2-pc)_2]n(Ln =Er(1), Ho(2), and Dy(3))(oba = 4,4?-oxybis(benzoate), 2-pc = 2-pyrazinecarboxylic acid) have been obtained under hydrothermal conditions. These compounds are isostructural and exhibit 2 D layered structures by incorporating [Ln_4(μ_3-OH)_4]^(8+) clusters and the mixed linkers of oba and 2-pc. It is interesting that decarboxylation occurred in the ortho position and 2,3-pyrazinedicarboxylic acid was partially transformed into 2-pc under hydrothermal conditions. Compound 3 emits a typical Dy^(3+) emission spectrum. Furthermore, the PXRD, TGA and IR spectra were also studied.

关键词： lanthanide cluster mixed ligands luminescence

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Chiral Amino Acids-Derived Catalysts and ligands

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Chinese Journal of Chemistry 2018年第9期36卷 791-797页

作者： Xiaohua Liu Shunxi Dong Lili Lin Xiaoming Feng Key Laboratory of Green Chemistry & Technology Ministry of Education College of Chemistry Sichuan University Chengdu Sichuan 610064 China

Transforming amino acids into novel catalysts and ligands is a remarkable subset of new catalyst development in order to imitate enzymatic efficiencies. Their ability to perform a variety of asymmetric catalytic reactions is complimented by their ready availability, rich transformations, stability and easy＇procedure. Herein, we focused-on describing our endeavoT ofdeveloping new catalysts and ligands from primary and secondary amino acids. It includes C2-symmetric N,N＇-dioxides, guanidine-amides, bispidine-based diamines, and other organic salts. The account covered a brief introduction about their discovery, representative applications and related mechanisms.

关键词： chirality asymmetric catalysis amino acids organocatalysts ligands

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