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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 plants.Exposure to and ingestion of heavy metals have been associated to liver,kidney,and brain function.Objective:The aim of this research is to comparatively examine the metal removal efficacy of three solid bidentate chemicals and four plant materials.Study 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 removed.OA 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 water.Furthermore,heavier metals are preferentially removed than lighter metals.

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

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配体密度控制促进CsPbBr_(3)量子点激子解离与能量转移实现高效CO_(2)光催化还原

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Science Bulletin 2024年第7期69卷 901-912页

作者：钟丰忆盛剑平杜晨宇何烨孙艳娟董帆 School of Resources and Environment University of Electronic Science and Technology of ChinaChengdu 611731China Research Center for Carbon-Neutral Environmental&Energy Technology Institute of Fundamental and Frontier SciencesUniversity of Electronic Science and Technology of ChinaChengdu 611731China

Perovskite quantum dots(PQDs) hold immense potential as photocatalysts for CO_(2) reduction due to their remarkable quantum properties,which facilitates the generation of multiple excitons,providing the necessary high-energy electrons for CO_(2) photoreduction.However,harnessing multi-excitons in PQDs for superior photocatalysis remains challenging,as achieving the concurrent dissociation of excitons and interparticle energy transfer proves elusive.This study introduces a ligand density-controlled strategy to enhance both exciton dissociation and interparticle energy transfer in CsPbBr_(3) PQDs.Optimized CsPbBr_(3) PQDs with the regulated ligand density exhibit efficient photocatalytic conversion of CO_(2) to CO,achieving a 2.26-fold improvement over unoptimized counterparts while maintaining chemical integrity.Multiple analytical techniques,including Kelvin probe force microscopy,temperaturedependent photoluminescence,femtosecond transient absorption spectroscopy,and density functional theory calculations,collectively affirm that the proper ligand termination promotes the charge separation and the interparticle transfer through ligand-mediated interfacial electron coupling and electronic interactions.This work reveals ligand density-dependent variations in the gas-solid photocatalytic CO_(2) reduction performance of CsPbBr_(3) PQDs,underscoring the importance of ligand engineering for enhancing quantum dot photocatalysis.

关键词： Perovskite quantum dots ligands Photocatalytic CO_(2)reduction Exciton dissociation Electronic coupling

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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 gamut.Halide 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 ligands.ligands 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 performance.The appropriate use of ligands in PeLEDs can thus lead to greater luminescence,current efficiency,power efficiency,and external quantum efficiency.In this review,the principal roles of ligands in quasi-2D and QD PeLEDs are systematically summarized.Furthermore,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 photodetectors.Recently,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 displays.This can be ascribed to the poor miscibility of quantum rods in polymer and strong concentration dependence of the polarized emission.The ligands of NR are very important for the alignment and brightness.In this article,we proposed a ligand combination comprising T-shape promesogenic phosphonic acid,which on being photoaligned provides mutually parallel alignment of the quantum rods.The 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 property.Later,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 nits.Thus,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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Methuselah regulates longevity via dTOR: a pathway revealed by small-molecule ligands

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分子细胞生物学报:英文版 2015年第3期7卷 280-282页

作者： Junjie Wang Zhilong Wang Zhenghong Zhang Qiuhong Hua Min Wang Changjie Shi Lei Xue Ru Zhang Xin Xie Shanghai Key Laboratory of Signaling and Disease Research Laboratory of Receptor-based Bio-medicineSchool of Life Sciences and TechnologyTongji UniversityShanghai 200092China CAS Key Laboratory of Receptor Research the National Center for Drug ScreeningShanghai Institute of Materia MedicaChinese Academy of SciencesShanghai 201203China

Dear Editor,G protein-coupled receptors(GPCRs),the largest and the most versatile family of membrane receptors,respond to a wide range of extracellular stimuli and control various physiological functions.The potential role of GPCRs in lifespan control has been highlighted by the study in Drosophila with mutations in a class B GPCR encoded by methuselah(mth).

关键词： functions versatile ligands

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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 backbone.The lengths of the Schiff base ligands are about 1.8 nm.The bi-nuclear lanthanide complexes 3 and 4 have nanoscale structures with sizes of approximately 0.7 nm×1.1 nm×1.6 nm.For 3,the molar ratio of Nd:Br:O obtained by the energy dispersive X-ray spectroscopy analysis is in agreement with the crystal structure.The chromogenic Schiff base ligands in1-4 can efficiently transfer energy to lanthanide ions,thus,these complexes exhibit the typical NIR luminescence of lanthanide ions.Interestingly,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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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 properties.Still,the stability issue of nanocrystals is a bottleneck for their practical application.Herein,we report a facile method for the synthesis of a series of phosphine ligand modified CsPbBr3 QDs with high PL intensity.By introducing organic phosphine ligands,the tolerance of CsPbBr3 QDs to ethanol,water and UV light was dramatically improved.Moreover,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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Novel Hybrid ligands for Passivating Pb S Colloidal Quantum Dots to Enhance the Performance of Solar Cells

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Nano-Micro Letters 2015年第4期7卷 325-331页

作者： Yuehua Yang Baofeng Zhao Yuping Gao Han Liu Yiyao Tian Donghuan Qin Hongbin Wu Wenbo Huang Lintao Hou State Key Laboratory of Luminescent Materials & Devices Institute of Polymer Optoelectronic Materials & DevicesSouth China University of Technology Siyuan Laboratory Department of Physics Jinan University

We developed novel hybrid ligands to passivate Pb S colloidal quantum dots(CQDs),and two kinds of solar cells based on as-synthesized CQDs were fabricated to verify the passivation effects of the ligands.It was found that the ligands strongly affected the optical and electrical properties of CQDs,and the performances of solar cells were enhanced strongly.The optimized hybrid ligands,oleic amine/octyl-phosphine acid/Cd Cl2improved power conversion efficiency(PCE)to much higher of 3.72%for Schottky diode cell and 5.04%for p–n junction cell.These results may be beneficial to design passivation strategy for low-cost and high-performance CQDs solar cells.

关键词： PbS Colloidal quantum dot Solar cells ligands

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Peroxisome Proliferator-Activated Receptor-γActivated by ligands Can Inhibit Human Lung Cancer Cell Growth through Induction of Apoptosis

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Journal of Huazhong University of Science and Technology(Medical Sciences) 2003年第2期23卷 138-140页

作者：张敏邹萍白明金阳陶晓南 Institute of Hematology Xiehe HospitalTongji Medical CollegeHuazhong University of Science and Technology Wuhan 430022 Department of Respiratory Xiehe HospitalTongji Medical CollegeHuazhong University of Science and Technology Wuhan 430022

To study the expression of peroxisome proliferator-activated receptor-7(PPAR-γ) in lung cancer cells, and to testify if the PPAR-γ agonists can inhibit human lung cancer cell growth through induction of apoptosis, PPAR-γ was detected in two lung cancer cell lines by RT-PCR and immuno-histochemistry, the inhibition of human lung cancer cell growth was investigated by MTT and cell counts, and the apoptosis was assessed by TUNEL. The results showed that: (1) PPAR-γ expressed on two lung cancer cell lines; (2) PPAR-γ activated by ligands could inhibit human lung cancer cell growth remarkably; (3) PPAR-γ agonists could induce apoptosis to inhibit lung cancer cell growth. It was concluded that PPAR-γ expressed in lung cancer cell can be activated by ligands and can inhibit lung cancer cell growth through induction of apoptosis.

关键词： PPAR-γ ligands lung cancer cell apoptosis

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