JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Amir Mahmoud Makin Adam,Madeha Ishag Adam,Chunmiao Zhang,Baffa Haruna,Mingzhu Chi,Xiong Li,Jia Kang Wan,Mujtaba Aminu,Girum Girma Bizuneh,Min Deng,Aimei Zhu,Qiugen Zhang,Qinglin Liu
Developing highly active Pd-based nanocatalysts with a well-organized structure is desired for direct alcohol fuel cell commercialization. In this study, room temperature seed mediated growth strategy has been successfully developed to prepare ternary Pd@Cd x -Ag y core-shell as advanced novel non-Pt anode nanocatalysts for ethanol oxidation reaction EOR in alkaline electrolyte . The introduction of oxophilic Cd and Ag metals into Pd nanocatalysts can reduce the adsorption energy of OH ads on the Pd@Cd x -Ag y nanocatalysts and inhibit the CO ads on the Pd surface. Morphological characterization demonstrates that the as-synthesized Pd@Cd x -Ag y nanocatalysts are well-organized core-shell nanostructure with Pd NPs as the core and Cd-Ag alloy as the shell. Moreover, electrochemical results indicate that the Pd@Cd 1 -Ag 1 core-shell catalyst exhibit a remarkable electrochemical activity ( 2995.76 mA mg Pd − 1 ), excellent CO tolerance and long-term durability compared to those of Pd@Cd ( 1285.9 mA mg Pd − 1 ), Pd@Ag ( 2423.52 mA mg Pd − 1 ) and commercial Pd/C (JM) ( 477.4 mA mg Pd − 1 ) nanocatalysts. The excellent catalytic activity and stability of Pd@Cd 1 -Ag 1 nanocatalyst can be associated to their huge electrochemical active surface area, positive influence of Cd-Ag NPs on Pd NPs and the unique well-organized core-shell nanostructure. These results suggested that the as-synthesized Pd@ C d x -Ag y core-shell could serve as advanced catalysts towards alkaline DEFCs.
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ENVIRONMENTAL POLLUTION
·
2019
·
IF 5.714
Fang Dong,Pu Wang,Wei Qian,Xing Tang,Xiaoshan Zhu,Zhenyu Wang,Zhonghua Cai,Jiangxin Wang
Ocean acidification (OA) is a global problem to marine ecosystems . Cadmium (Cd) is a typical metal pollutant, which is non-essential but extremely toxic to marine organisms. The combined effects of marine pollution and climate-driven ocean changes should be considered for the effective marine ecosystem management of coastal areas. Previous reports have separately investigated the influences of OA and Cd pollution on marine organisms. However, little is known of the potential combined effects of OA and Cd pollution on marine diatoms. We investigated the sole and combined influences of OA (1500 ppm CO 2 ) and Cd exposure (0.4 and 1.2 mg/L) on the coastal diatom Skeletonema costatum . Our results clearly showed that OA significantly alleviated the toxicity of Cd to S. costatum growth and mitigated the oxidant stress, although the intercellular Cd accumulation still increased. OA partially rescued S. costatum from the inhibition of photosynthesis and pyruvate metabolism caused by Cd exposure. It also upregulated genes involved in gluconeogenesis, glycolysis, the citrate cycle (TCA), Ribonucleic acid (RNA) metabolism, and especially the biosynthesis of non-protein thiol compounds. These changes might contribute to algal growth and Cd resistance. Overall, this study demonstrates that OA can alleviate Cd toxicity to S. costatum and explores the potential underlying mechanisms at both the cellular and molecular levels. These results will ultimately help us understand the impacts of combined stresses of climate change and metal pollution on marine organisms and expand the knowledge of the ecological risks of OA.
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高影响因子
Polymers
·
2019
·Vol. 11
·期 10
·1716
·
IF 3.164
Feng Guo,Guiying Li,Songmei Ma,Hengquan Zhou,Xinyi Chen
A temperature, glutathione (GSH), and H2O2multi-responsive composite nanocarrier (MSN-SS-Fc@β-CD-PNIPAM) based on β-cyclodextrin-poly(N-isopropylacrylamide) (β-CD-PNIPAM) star polymer capped ferrocene modified mesoporous silica nanoparticles (MSN-SS-Fc) was successfully prepared. The surface of the mesoporous silica was first modified by ferrocene (Fc) via a disulfide bond (–SS–) to form an oxidizing and reducing site and then complexed with a β-CD-PNIPAM star shaped polymer through host–guest interactions as a nano-valve to provide temperature responsive characteristics. The structure and properties of the complex nanoparticles were studied by FTIR, TGA, EDS, Zeta potential, and elemental analysis. Doxorubicin (DOX) and Naproxen (NAP), as model drugs, were loaded into nanocarriers to assess drug loading and release behaviour. The release of drugs from nanocarriers was enhanced with an increase of the GSH, H2O2concentration, or temperatures of the solution. The kinetics of the release process were studied using different models. This nanocarrier presents successful multi-stimuli responsive drug delivery in optimal stimuli and provides potential applications for clinical treatment.Keywords:disulfide bond;ferrocene;multi-responsive;nanocarrier;MSNs
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Yidong Xu,Wenzhuo Dong,Mengqian Jia,Jiwei Shen,Chaozhan Wang,Yinmao Wei
This work explores an enrichment integrated derivatization strategy for diols-containing short-chain aliphatic compounds (DSCAs) by using cyclodextrin (CD)-metal–organic frameworks (MOFs) as adsorbents. For this purpose, α-, β-, γ-CD-MOFs with different sizes of hydrophobic cavities were prepared and their encapsulation ability towards polycyclic aromatic hydrocarbons, especially phenylboronic acid (PBA), was investigated. It is found that the formed supramolecular adsorbents PBA@CD-MOFs can simultaneously perform the enrichment and derivatization of DSCAs in organic solution, simplifying the sample pre-treatment procedure of the DSCAs. Finally, an analytical method based on solid-phase extraction combined with high-performance liquid chromatography (HPLC) was established for the detection of 3-monochloropropane-1,2-diol (3-MCPD) in canned samples. The relative recoveries of three analytes are 82.4 to 87.5 %, the intra- and inter-day relative standard deviations (RSDs) are less than 10.9 %, and the limits of detection (LODs) are 0.934–2.77 ng∙g −1 . In conclusion, the enrichment integrated derivatization strategy can be used as an alternative to the traditional sample pretreatment method, which usually requires enrichment, elution and derivatization for the detection of DSCAs in various food samples.
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JOURNAL OF PHYSICS D-APPLIED PHYSICS
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2023
·Vol. 56
·期 49
·495103
·
IF 3.4
Yujiao Ma,Yuzhou Sun,Zihan Zhang,Haokai Zhao,Haifeng Gao,Qing Zhou,Wenbo Li,Xiaoyun Teng,Chao Gao,Wei Yu
In this paper, the open-circuit voltages (VOC) of Cu2ZnSn(S,Se)4 (CZTSSe) solar cells were improved by soaking the CZTSSe films in Cd/NH3 solutions before the deposition of buffer layers. The effects of Cd/NH3 soaking on the properties of CZTSSe films and solar cells were investigated in depth. We found Cd/NH3 soaking can promote downward band bending of the CZTSSe layer at the surface region. In addition, the Cd/NH3 soaking can eliminate the deep level acceptor in CZTSSe and decrease the density of the defects at the absorber/buffer interface. These effects can significantly reduce the carrier recombination in the depletion region of CZTSSe solar cells. As a result, the VOC of CZTSSe solar cells were increased from ∼460 mV to ∼480 mV, the efficiency of the best CZTSSe solar cell was increased from 10.2% to 11.6% by the Cd/NH3 soaking process.
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Journal of Water Process Engineering
·
2023
·
IF 7
Qingsheng Xu,Zhengbo Yue,Rui Deng,Xinquan Wang,Xiao He,Xin Chuai,Shaoping Wang,Jin Wang
The alkaline sludge produced by the neutralization treatment of acid mine drainage (AMD) is not only large and difficult to treat, but also prone to secondary pollution. The cost of conventional sludge treatment technology is high, so there is an urgent need to develop new methods. The process of neutralizing AMD is similar to the co-precipitation reaction of LDHs, so the cost of recovering LDHs from AMD is lower, but the application performance of LDHs is limited by the stacking of laminates. In this paper, the structure of LDHs was optimized by adding biochar (BC) during the neutralization process of AMD. After adding 40 % BC, the crystal planes of alkaline sludge based LDHs (AS-LDHs) became more parallel, and the adsorption properties of Cd and Cu were increased by 2.7 and 1.95 times, with the maximum adsorption amounts of 901.5 and 231.3 mg/g, respectively. The relevant removal mechanism was investigated in depth at the electronic scale by experiments combined with DFT calculations. Since AS-LDHs have the advantages of good acid stability, low zero-point charge and strong adsorption and regeneration capacity, this method has a broad application prospect.
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DALTON TRANSACTIONS
·
2019
·Vol. 48
·期 8
·2715-2721
·
IF 4.052
Lin Lin,Siyu Huang,Yuxin Zhu,Biao Du,Zhihua Zhang,Chao Chen,Xuewen Wang,Ning Zhang
A new synthetic method was used to develop a CdS/MoS2 heterojunction. Cd-MOF was coated onto the surface of MoS2 flowers to construct a core–shell MoS2@Cd-MOF. Thioacetamide was used as a sulfur source to sulfurize the MoS2@Cd-MOF to form a CdS/MoS2 heterojunction. Since the Cd2+ ions were highly ordered and separated by the organic ligands of the Cd-MOF shell, the as-synthesized CdS/MoS2 heterojunction possessed a large surface area and intimate contact at the heterogeneous interface with a uniform loading of CdS nanoparticles on the MoS2 flowers. Consequently, the CdS/MoS2 heterojunction exhibited a significantly enhanced photocatalytic H2 evolution rate of average 5587 μmol h−1 g−1 under UV-visible light irradiation.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
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2018
·Vol. 18
·期 12
·8201-8206
·
IF 1.354
Ding Xu,Zhu Geng,Guan Jian-Ning,Han Guo-Zhi
In this paper, we first report the selective reduction of nitro group in aryl halides catalyzed by silver nanoparticles modified with β-CD. Taking advantage of hydrophobic lumen and donor–acceptor behavior of β-CD, the halogenated alkyl groups on the aromatic
ring can be enveloped in the inner cavity that thereby inhibits the reduction of the halogen. For validating the mechanism proposed by us, different silver nanoparticles were applied in parallel experiments. In our experiments, UV-vis spectra and NMR spectra were used to characterize the selectivity.
This strategy represents an outstanding improvement on the synthesis of halogenated aromatic amines in comparison with the traditional route, and greatly expands the application of silver nanoparticles in catalytic field.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Shanshan Pan,Hui Liu,Zhili Li,Li You,Shengnan Dai,Jiong Yang,Kai Guo,Jun Luo
Due to the lone-pair-induced anharmonic rattling, InTe exhibits intrinsically ultralow thermal conductivity , which was considered as a candidate for thermoelectric application. However, the poor electrical transport properties result in low thermoelectric conversion efficiency. In this work, Cd doping in InTe have been performed with the aim to optimize the carrier concentration and increase the power factor. Furthermore, an essential enhancement of carrier mobility can be realized via prolonging the annealing time, leading to improved thermoelectric performance. As a result, the maximum thermoelectric figure of merit zT of 0.87 at 773 K has been achieved for In 0.98 Cd 0.02 Te undergoing 7 days annealing treatment (In 0.98 Cd 0.02 Te-7days), which is 67% higher than the value of InTe after 2 days annealing (InTe-2days, zT = 0.52@773 K). The average zT increases significantly from 0.26 for InTe-2days to 0.53 for In 0.98 Cd 0.02 Te-7days in the temperature range of 323–823 K. Thus, both introducing Cd dopant and regulating the annealing time have obvious effects on improving the thermoelectric performance of InTe.
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MOLECULES
·
2018
·Vol. 23
·期 10
·2492
·
IF 3.098
Xiaodan Liu,Fei Liu,Weihao Huang,Jiyu Peng,Tingting Shen,Yong He
Rapid detection of Cd content in soil is beneficial to the prevention of soil heavy metal pollution. In this study, we aimed at exploring the rapid quantitative detection ability of laser- induced breakdown spectroscopy (LIBS) under the conditions of air and Ar for Cd in soil, and finding a fast and accurate method for quantitative detection of heavy metal elements in soil. Spectral intensity of Cd and system performance under air and Ar conditions were analyzed and compared. The univariate model and multivariate models of partial least-squares regression (PLSR) and least-squares support vector machine (LS-SVM) of Cd under the air and Ar conditions were built, and the LS-SVM model under the Ar condition obtained the best performance. In addition, the principle of influence of Ar on LIBS detection was investigated by analyzing the three-dimensional profile of the ablation crater. The overall results indicated that LIBS combined with LS-SVM under the Ar condition could be a useful tool for the accurate quantitative detection of Cd in soil and could provide reference for environmental monitoring.Keywords:soil;Cd;laser-induced breakdown spectroscopy;argon
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ENVIRONMENTAL POLLUTION
·
2024
·
IF 7.6
Zhilan Chen,Yi Jiang,Xuebin Lai,Chenhong Zhu,Dapeng Zhang,Hailin Wang
Pentachlorophenol (PCP) - cadmium (Cd) complex pollution has been identified as a form of persistent soil pollution in south China, exerting detrimental impacts on the indigenous soil bacterial communities. Hence, it is worthwhile to investigate whether and how bacterial populations alter in response to these pollutants. In this study, Escherichia coli was used as a model bacterium. Results showed that PCP exposure caused bacterial cell membrane permeability changes, intracellular ROS elevation, and DNA fragmentation, and triggered apoptosis-like cell death at low exposure concentration and necrosis at high exposure concentration. Cd exposure caused severe oxidative damage and cell necrosis in the tested bacterial strain. The co-exposure to PCP and Cd elevated the ROS level, stimulated the bacterial caspase activity, and induced DNA fragmentation, thereby leading to an apoptosis-like cell death. In conclusion, PCP-Cd complex pollution can cause bacterial population to decrease through apoptosis-like cell death pathway. However, it is worth noting that the subpopulation survives under the complex pollution stress.
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NEW JOURNAL OF CHEMISTRY
·
2024
·
IF 2.7
Wenting Li,Sheng Xu,Zhenghao Li,Lingli Liu,Zhenxi Wang,Xin Dai
A sensitive electrochemical sensor based on ion-imprinted chitosan–graphene (CS/rGO-IIP) nanocomposites has been developed for the determination of Cd(II). The surface morphology of CS/rGO-IIP was studied via scanning electron microscopy (SEM), and the structure was analyzed using Fourier transform infrared spectroscopy (FTIR). Differential pulse anodic solution voltammetry (DPASV) was used to detect Cd(II) to evaluate the performance of the electrochemical sensor. The detection limit of the CS/rGO-IIP electrode for Cd(II) was 0.2 μg L−1, and the linear range obtained for Cd(II) was 1–160 μg L−1, which was found to be below the limits set by the World Health Organisation (WHO). The developed sensor has excellent anti-interference, reproducibility and stability, and can be applied for the determination of Cd(II) in a real water environment. This work offers a viable method for ion imprinting electrochemical interface construction and electrochemical sensing.
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