MOLECULES
·
2025
·Vol. 30
·期 7
·1533
·
IF 4.6
Yuyang Gan,Yimin Cai,Song Huang,Xiaowei Li,Wen Feng,Lihua Yuan
Nitrogen donor-based ligands are highly promising extractants for palladium separation from high-level liquid waste (HLLW). However, the electronic effect of these ligands, a critical factor influencing their complexation ability with Pd(II), remains largely unexplored. Herein, three picolinamide-based ligands were designed and synthesized, each featuring substituents with distinct electronic effects at thepara-position of the pyridine (electro-donating methoxyl group for L-I, hydrogen for L-II, and electro-withdrawing ester group for L-III). The concurrent processes of Pd(II) coordination and ligand protonation enable the manipulation of pyridine nitrogen electronegativity, resulting in a tunable Pd(II) extraction performance. Notably, L-I exhibits the highest extraction efficiency at low acidities (≤1 M HNO3) but the lowest extraction at high acidities (≥3 M HNO3), whereas L-III shows the poorest efficiency at low acidities but the best performance at high acidities. The Job plot analysis and ESI-HRMS results reveal a 1:1 and 2:1 (L/Pd) stoichiometry in the Pd(II) complexation process. The single crystal X-ray analysis of Pd(NO3)2(L-II)2complex confirms a four-coordinated Pd(II) center, with two pyridine nitrogen atoms and two monodentate nitrate oxygens forming a quadrangular geometry. Density functional theory (DFT) calculations further indicate that the formation of 2:1 (L/Pd) complexes is energetically favored, and the stronger basicity of the nitrogen atoms correlates with a higher Pd(II) binding affinity and increased susceptibility to protonation.
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PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 20
·30256-30268
·
IF 0
Li Qi,Tan Liju,Wang Jiangtao
There are many studies on the toxic effects of single nanoparticles on microalgae; however, many types of nanoparticles are present in the ocean, and more studies on the combined toxic effects of multiple nanoparticles on microalgae are needed. The single and combined toxic effects of nCu and nSiO 2 on Dunaliella salina were investigated through changes in instantaneous fluorescence rate (Ft) and antioxidant parameters during 96-h growth inhibition tests. It was found that the toxic effect of nCu on D. salina was greater than that of nSiO 2 , and both showed time and were dose-dependent with the greatest growth inhibition at 96 h. A total of 0.5 mg/L nCu somewhat promoted the growth of microalgae, but 4.5 and 5.5 mg/L nCu showed negative growth effects on microalgae. The Ft of D. salina was also inhibited by increasing concentrations of nanoparticles and exposure time. nCu suppressed the synthesis of TP and elevated the MDA content of D. salina , which indicated the lipid peroxidation of algal cells. The activities of SOD and CAT showed a trend of increasing and then decreasing with the increase of nCu concentration, suggesting that the enzyme activity first increased and then decreased. The toxic effect of a high concentration of nCu was reduced after the addition of nSiO 2 . SEM and EDS images showed that nSiO 2 could adsorb nCu in seawater. nSiO 2 also adsorbed Cu 2+ in the cultures, thus reducing the toxic effect of nCu on D. salina to a certain extent. TEM image was used to observe the morphology of algal cells exposed to nCu.
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PubMed
ChemistrySelect
·
2025
·Vol. 10
·期 9
·e202405355
·
IF 2
Shaogang Zhang,Xiaolong Ma,Xin Min,Xiaoguang Zhang,Jinhong Li
Graphical A series of EV-CaCl2·6H2O composite PCMs were prepared. SrCl2·6H2O and copper nanoparticles affect the supercooling and thermal conductivity of EV-CaCl2·6H2O composite PCMs, respectively. The non-isothermal melt crystallization process and crystallization activation energy were studied. Solid-liquid phase change materials (PCMs) made from calcium chloride hexahydrate (CaCl 2 ·6H 2 O) offer benefits such as significant latent heat during phase change, high heat storage efficiency, low preparation costs, a nearly constant temperature exothermic process, and environmentally friendly attributes. However, they also face challenges like poor thermal conductivity, susceptibility to leakage, supercooling, and phase separation. The melt impregnation method prepared shape-stable composite PCMs using expanded vermiculite (EV) and CaCl 2 ·6H 2 O as raw materials. The layered pore structure of EV can be used as an encapsulation matrix to prevent the leakage of the CaCl 2 ·6H 2 O liquid phase. Adding 1 wt% strontium chloride hexahydrate (SrCl 2 ·6H 2 O) nucleating agent and 3 wt% copper nanoparticle thermal conductivity enhancer can reduce the supercooling by 8 °C and increase the thermal conductivity by 0.2092 W/(m·K). The kinetic equation effectively describes the non-isothermal melt crystallization process. An increase in the cooling rate creates a thermal hysteresis effect on melt crystallization; the faster the cooling rate, the lower the temperature at which crystallization begins and the shorter the duration required for crystallization to complete. Both SrCl 2 ·6H 2 O and copper nanoparticles can reduce the crystallization activation energy, which is the essential reason for lowering the supercooling of CaCl 2 ·6H 2 O.
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高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Zeqian Zhang,Hongshan Wu,Qiming Chen,Xiaowei Li,Yimin Cai,Lihua Yuan,Wen Feng
Efficient and selective palladium (Pd) recovery from high-level liquid waste (HLLW) constitutes a crucial task for both precious resource recovery and environmental remediation, but remains challenging to achieve high efficiency, sufficient selectivity, and fast kinetics. Herein, we report a new pyrazinamide ligand (denoted as PA) as the first example of employing pyrazine-based ligand for Pd 2 + separation with impressive efficiency. Using an ionic liquid C 8 mimNTf 2 as diluent, the developed pyrazinamide-ionic liquid (PA-IL) extraction system exhibited attractive merits for Pd 2+ separation such as a wide range of workable acidities from 0.2 M to 5 M HNO 3 , ultra-fast extraction kinetics with equilibrium time of 3 min, and good Pd 2+ selectivity over 16 ions coexisting in simulated HLLW and other non-metallic anions. Slope analysis indicated that the extraction mechanism involves the cation exchange of C 8 mim + and the coextraction of NO 3 - anions in the course of Pd 2+ extraction. Results from a set of spectroscopic investigations and single crystal X-ray diffraction analysis suggest the formation of complexes with stoichiometry of both 1:1 and 2:1 (PA/Pd 2+ ) in solution and in solid state, of which the formation of 2:1 complex is the most thermodynamically favored according to DFT theoretical calculations. This work provides a highly promising pyrazinamide-based extraction system for efficient and selective Pd 2+ separation from HLLW, and brings more understanding about the complexation and coordination behaviors between N-based ligands and Pd 2+ ions.
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高影响因子
Solar RRL
·
2025
·
IF 4.7
Xiaoxiao Huang,Jianguo Duan,Qihui Yu,Qing Ma
Graphene composite phase change materials (PCMs) show great application potential in solar energy conversion and storage due to their strong light absorption and high thermal conductivity. To further enhance the photothermal conversion and leakage prevention performance of graphene composite PCMs. This article adopts a “point-surface” modification strategy. Through a hydrothermal reduction self-assembly method, nanocopper particles are doped into polyvinyl alcohol (PVA) cross-linked graphene nanosheets to construct a novel graphene nanosheet-nanosized Cu particle/polyethylene glycol (PEG) composite PCMs. The random distribution of nanocopper particles significantly enhances the spectrum absorption capacity and interfacial heat transfer efficiency of the graphene skeleton. The results show that the thermal conductivity of PEG/PG–Cu 0.06 reaches 0.793 W/m −1 k −1 , which is 317.4% of pure PEG. Its latent heat enthalpy value reaches 185.7 J g −1 , and the enthalpy value attenuation rate after 200 thermal cycles is less than 0.21%. Moreover, when the simulated light intensity was 120 mW cm −2 , the PEG/PG–Cu 0.06 photothermal conversion efficiency is 86.2%. Meanwhile, the cross-linked network formed by PVA and graphene can effectively inhibit PEG leakage, and the leakage rate of PEG/PG–Cu 0.06 is 21.6%. Additionally, the 3D graphene-PVA matrix modified by nano-Cu particles is used to improve the thermal conductivity and the spectrum adsorption capacity of composite PCMs, which have excellent photothermal conversion performance and thermal stability and have great application prospects in solar energy heat storage.
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高影响因子
ANALYTICAL CHEMISTRY
·
2025
·
IF 6.7
Jiayue Zhou,Dongmei Li,Ziwei Chen,Tiantian Li,Ying Liu,Jie Nan,Linyuan Wang,Yinuo Chen,Guanggui Yu,Na Sai
Inspired by the color patterns of blue-winged teals’ feathers, a new biomimetic imprinting (IM) probe with chemical fluorescent (CF) color and physical structural (PS) color was developed for the label-free and ratiometric detection of levofloxacin (LOF). The probe is defined by a periodic photonic crystal structure formed by monodisperse imprinting microspheres that incorporate LOF-binding nanocavities, similar to the color emission structure of teals. With the increase of the LOF solution, the probe can selectively bind LOF molecules and demonstrate a two-color response without the use of labels: the CF color emerged from the entering of CF color-emissive LOF molecules, further enhanced by the Purcell effect, while the PS color resulted from the periodic photonic crystal structure. As the concentration of LOF increases, the CF color becomes brighter (turn on), while the PS color becomes darker (turn off). These color changes are perceptible to the naked eye. The probe demonstrated label-free, sensitive (down to 2.77 nmol/L), rapid (10 min), selective, and stable detection of the LOF, utilizing a self-correction function of colors. In addition, the probe was successfully applied in real sample detection.
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PubMed
高影响因子
Colloid and Interface Science Communications
·
2025
·
IF 4.7
Jun Sun,Sulei Zhang,Yichen Wang,Denghai Sheng,Shengjie Liu,Yu Rao,Aiqing Li,Yuchun Pan,John L. Brash,Xiaoli Liu,Hong Chen
Thrombus formation often leads to the failure of intravascular implants. Natural endothelium provides multifaceted antithrombotic functions through nitric oxide/ prostacyclin secretion to inhibit platelet activation, glycosaminoglycan mediated anticoagulation, and tissue-type plasminogen activator driven fibrinolysis. Therefore, surfaces mimicking these multiple endothelial functions are expected to have enhanced antithrombotic properties. In this study, polyvinyl chloride surface was rendered porous through solvent/nonsolvent-induced phase separation and loaded with a metal-organic framework, CuBTTri to catalyze nitric oxide release from a precursor. Furthermore, using layer-by-layer self-assembly, multiple bilayers of a poly(lysine- co -oligo(ethylene glycol) methyl ether methacrylate) copolymer (fibrinolysis-promoting), and sodium heparin (endothelial cell growth-promoting), were deposited on the un-etched side of the polyvinyl chloride. This modified surface was shown to be capable of releasing nitric oxide, destroying nascent thrombus, inhibiting smooth muscle cell growth, and promoting endothelial cell adhesion. This study represents a novel approach to developing multifunctional blood-contacting surfaces that mimic multiple properties of the endothelium.
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高影响因子
危险品化学品经营许可证（带存储）