ANALYTICAL CHEMISTRY
·
2022
·
IF 8.008
Guojuan Zhang,Yujie Han,Zhiguang Liu,Lifang Fan,Yujing Guo
A triple-amplified and ratiometric electrochemical aptasensor for CA125 was designed based on hemin–graphene/SH-β-cyclodextrin@PdPt nanoflower (H-Gr/SH-β-CD@PdPtNF) composites and an exonuclease I (Exo I)-assisted strategy. In the nanocomposite, hemin acts as an internal reference signal owing to the reversible heminox/heminred pair. PdPtNFs can significantly improve the electron transfer rate. SH-β-CD can efficiently enrich quercetin probes through host–guest recognition and increase the second indicator signal. In the presence of CA125, due to the specific binding between the aptamer and CA125, the conformational change of dsDNA (designed by the CA125 aptamer and its complementary DNA) results in the release of quercetin embedded in dsDNA. Subsequently, the free quercetin and DNA fragments are enriched on the H-Gr/SH-β-CD@PdPtNF-modified electrode. Thus, an enhanced oxidation peak from quercetin (IQ) and a reduced peak from hemin (Ihemin) can indicate the same biological identification event. In addition, the recycling amplification of CA125 by Exo I can effectively assist the increase of the quercetin signal. The value of IQ/Ihemin is linear with the concentration of CA125 in the range from 6.0 × 10–4 to 1.0 × 103 ng/mL, and the limit of detection is 1.4 × 10–4 ng/mL. The recovery of CA125 in human blood serum samples was from 99.2 to 104.4%. The proposed sensor is sensitive and reliable, which provides an avenue for the development of triple amplification and ratiometric signal strategies for detecting tumor markers in clinical diagnostics.
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高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2022
·Vol. 48
·期 6
·2721-2744
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IF 3.134
Song Ruiming,Li Zhimei,Li Wanli,An Ya,Li Mei,Qin Haoli,Liu Chengshuai
Clay adsorbents are considered an inexpensive and readily available solution for removing heavy metals, including cadmium, from the environment to reduce pollution. In this study, thiol-modified bentonite (SH-Bent) was prepared by grafting cysteamine hydrochloride onto natural bentonite (Bent). The effects of pH, equilibrium contact time, and temperature on the adsorption–desorption behavior of Cd 2+ were studied, and adsorption isotherm models were applied to examine the adsorption behavior of SH-bent. SH-Bent demonstrated better performance and stability for Cd 2+ adsorption than Bent. SH-Bent exhibited an enhanced adsorption capacity for Cd 2+ at equilibrium of 49.3 mg/g at pH 6, 120 min, and 303 K, which was 42-fold higher than that of Bent under the same conditions. An investigation of the desorption behavior of Cd 2+ adsorbed on Bent and SH-Bent in simulated acid rain revealed that SH-Bent has high stability, with a desorption rate of 5.73% at pH 4.5, 60 min, and 303 K, which was much lower than that demonstrated by Bent under the same conditions (45.68%). The Langmuir equation was the best-fitted adsorption isotherm model, closely followed by the Freundlich, Tempkin, and Dubinin–Radushkevich models. A significant difference in diffusion was observed between the two types of clay according to the intraparticle diffusion model. The adsorption–desorption processes of SH-Bent and Bent fit the pseudo-second-order model best among the five kinetic models examined. The information provided in this study can be used to apply thiol-modified clay for wastewater treatment or for the removal of cadmium from soil. Graphical abstract
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Environmental Science-Nano
·
2023
·Vol. 10
·期 9
·2500-2513
·
IF 7.3
Chao Xue,Xiaoyun Yi,Yuebei Yang,Feng Jiang,Hua Yin,Zhi Dang
It has been widely believed that the adsorption mechanism of cadmium on iron (oxyhydr)oxide is solely the inner-sphere complexation based on extended X-ray absorption fine structure spectroscopy (EXAFS). However, these results were obtained at specific experiment settings (high ionic strength and high cadmium surface loading). In natural cadmium-polluted soil and water environments, such as acidic mineral drainage (AMD) areas, the pH/ionic strength is relatively low. Therefore, under practical conditions, the bonding pathway of cadmium could be different and may comprise other potential mechanisms. This work focuses on the proportion of different cadmium sorption pathways on goethite by employing a chemical extraction procedure. Cadmium is mostly adsorbed on goethite via electrostatic adsorption and inner-sphere complexation in a pH range of 5.5–7.5 under 10 mM ionic strength conditions. Through quantitative calculation, it is confirmed that the amount of Mg(NO3)2-extracted cadmium can refer to the content of electrostatically adsorbed cadmium. Two types of surface hydroxyls contributed differently to inner-sphere complexed Cd(II) at different pH values, and the emergence of surface-induced precipitates at higher pH could also be included in the retention mechanism. The behavior of electrostatically adsorbed cadmium and inner-sphere complexed Cd(II) was found to be different at different pH values when sulfate was introduced. Based on zeta potential and total reflectance Fourier transform infrared spectral analyses, sulfate would modify the surface charge of goethite, but, moreover, sulfate might form pseudo ion-group species with cadmium, which could influence the sorption pathway of cadmium.
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ECS Journal of Solid State Science and Technology
·
2021
·Vol. 10
·期 12
·124003
·
IF 2.07
Xinli Wang,Jin Li
Doping is an effective functional modification method for improving the optical, electrical, and magnetic properties of semiconductors. Here, Cd-doped wurtzite ZnO-quantum-dot (ZQ) zero-dimensional nanomaterials were successfully prepared via liquid-phase synthesis. The experimental results showed that Cd doping can effectively shorten the bandgap, where the optical bandgap range of Cd-doping photocatalysts were 3.31–3.36 eV; in particular, the Cd5-ZQ (Cd contents of 0.5 wt%) sample reduced the bandgap from 3.39 to 3.31 eV compared to that of pure ZQ. This is consistent with the experimental results, where the simulation calculation results indicated the bandgap reduced from 3.107 to 2.912 eV after introducing Cd. Photoluminescence spectroscopy results confirmed the Cd-ion dopants efficiently capture excited electrons and further prolongs the charge lifetime. The degradation of a methylene blue solution under simulated solar light irradiation revealed that the photocatalytic properties of Cd-ZQ nanomaterial with suitable dopant concentration (Cd content 0.5 wt%) was significantly better than those of pure ZQ. The underlying mechanism involves a synergistic effect, and a reasonable and convenient strategy for uprate performance is presented.
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Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Xinyue Guo,Yanqiu Hu,Chaowen Chen,Jia Zhang,Pengqi Yang,Yue Du,Dongfang Wang,Dongqing Cai,Zhengyan Wu
Remediation of cadmium ion in polluted water suffers from high cost and low efficiency. Nanoscale zero-valent iron (NZVI) was able to extract Cd(II) from water effectively, but the liability to aggregate greatly limits its broad application. Herein, we develop a promising remedy (CCP@NZVI) for the rapid and efficient removal of Cd(II) in water by facile coating conductive carbon paint (CCP) on NZVI. Compared with NZVI alone, CCP@NZVI shows enhanced efficiency, achieving removal up to 95% in 5 min at a low dose (0.67 g/L). We demonstrated the validity of a build-in primary battery as the driving force for the removal of Cd(II). In water contaminated by Cd(II), NZVI acting as the anode tends to be oxidized to ferrous ion and transfers electron to CCP as the cathode, wherein dissolved O 2 is reduced to OH - for interfacial Cd(II) precipitation. A panel of characterization techniques including scanning electron microscopy, X-ray photoelectron spectroscopy, X-ray powder diffraction, and open circuit potential, have been used to analyze CCP@NZVI before and after the reactions, verifying the immobilization of absorbed Cd(II) in CCP@NZVI as Cd(OH) 2 . In addition, this method exhibits good stability against weak acid and coexisting anions with satisfactory biosafety . Importantly, the Cd-immobilized CCP@NZVI after treatment can be easily separated via weak magnetic field. This study provides a novel strategy to achieve rapid Cd(II) removal at low-cost and with collectability, which may have a tremendous application prospect in environment fields including water treatment and soil detoxication.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Qianyu Sun,Tianzhong Yuan,Gang Yang,Daliang Guo,Lizheng Sha,Rendang Yang
The solubility of cyclodextrin metal-organic frameworks (CD-MOFs) in aqueous media making it not suitable as sustained-release drug carrier. Here, curcumin-loaded CD-MOFs (CD-MOFs-Cur) was embedded in chitosan- graft -poly(lactic acid) (CS-LA) via a solid-in-oil-in-oil (s/o/o) emulsifying solvent evaporation method forming the sustained-release composite microspheres . At CS-LA concentration of 20 mg/mL, the composite microspheres showed good sphericity. The average particle size of CS-LA/CD-MOFs-Cur (2:1), CS-LA/CD-MOFs-Cur (4:1) and CS-LA/CD-MOFs-Cur (6:1) composite microspheres was about 9.3, 12.3 and 13.5 μm, respectively. The above composite microspheres exhibited various degradation rates and curcumin release rates. Treating in HCl solution (pH 1.2) for 120 min, the average particle size of above microspheres reduced 28.19 %, 24.34 % and 6.19 %, and curcumin released 86.23 %, 78.37 % and 52.57 %, respectively. Treating in PBS (pH 7.4) for 12 h, the average particle size of above microspheres reduced 30.56 %, 26.56 % and 10.66 %, and curcumin released 68.54 %, 54.32 % and 31.25 %, respectively. Moreover, the composite microspheres had a favorable cytocompatibility, with cell viability of higher than 90 %. These composite microspheres open novel opportunity for sustained drug release of CD-MOFs.
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高影响因子
Journal of Analytical Methods in Chemistry
·
2023
·
IF 2.6
Xiaoyu Yang
Simultaneous enantioseparation of three commonly used chiral antifungal pesticides (diniconazole, hexaconazole, and imazalil) was first studied based on micellar electrokinetic chromatography (MEKC) with hydroxypropyl-γ-CD (HP-γ-CD) as chiral selector. In this study, the importance of experimental parameters such as chiral selector type and concentration, sodium dodecyl sulfate (SDS) concentration, the ratio of methanol, and separation voltage in optimizing were investigated. The simultaneous enantioseparation of diniconazole, hexaconazole, and imazalil was successfully achieved in 30 mM borate buffer (pH 9.0) containing 10 mM HP-γ-CD and 20 mM SDS with methanol (8%) added as organic modifiers. The resolution of diniconazole, hexaconazole, and imazalil was 15.2, 2.12, and 2.78, respectively, and the peak efficiency (N) was over 566,825 plates/m. This study provides an alternative way to systematically separate chiral antifungal pesticides with high efficiency.
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高影响因子
CHEMOSPHERE
·
2023
·
IF 8.8
Chenxi Zhang,Haibo Li,Yue Yang,Xulun Zhou,Damiao Zhuang,Wengang Liu,Kaixuan Wang,Pengkai Wang,Wenxin Zhang,Yaran Bai,Haotian Ma,Bingqian Gao,Rui Wang
Rhizosphere phosphatases can exhibit hormetic effects in response to cadmium (Cd) ion stimulation. However, understanding the mechanisms underlying hormesis effects on soil ecosystems is challenging as studies on hormesis are usually specific to an organism, cell, or organ. To comprehensively investigate the mechanism of phosphatase hormesis, this study utilized in situ zymography and metabolomics to analyze the rhizosphere of Trifolium repens L. (white clover). Zymograms showed that rhizosphere phosphatase displayed a hormetic effect in 10 mg kg −1 Cd contaminated soil, with a hotspot area 1.8 times larger than non-Cd contaminated soil and a slight increase in enzyme activity . Nevertheless, the phosphatase activity was substantially suppressed upon elevating the Cd concentration in the soil to 50 mg kg −1 . Differential metabolite identification and KEEG pathway enrichment analysis revealed that both rhizosphere organic acids and amino acid compounds positively affected phosphatase activity, and both were able to stabilize complexation with Cd ions via carboxyl groups . Besides, molecular docking models suggested that Cd ions act as cofactors to induce the formation of hydrogen bonds between amino acids/organic acids and phosphatase residues to form a triplet complex with a more stable structure, thereby improving phosphatase activity. The results indicated that amino acids and organic acids are heavily enriched in the rhizosphere of white clover and form a particular structure with soil Cd ions and phosphatase, which is essential for inducing the phosphatase hormesis as a detoxification mechanism in the rhizosphere micro-ecosystem.
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高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2021
·
IF 5.645
Ming-Zhao Xiao,Rui Sun,Zhi-Yan Du,Wen-Bin Yang,Zhuohua Sun,Tong-Qi Yuan
Cadmium (Cd) contaminant in soil can pollute crops and poison consumers higher in the food chain. Sorghum ( Sorghum bicolor (L.) Moench) is a promising bioenergy crop that can absorb and accumulate Cd from soil while generate renewable biomass resources for bioethanol or other valuable products, and limit waste production by rational utilization of all components. In this study, a sustainable agricultural strategy was presented and six sorghum cultivars grown under field conditions for the phytoremediation of Cd-contaminated agricultural soil were investigated with the goal of comparing their ability to accumulate Cd and their theoretical bioethanol yields (Cd concentration in the soil was 0.25 and 0.96 ppm). Striking differences were found in the Cd accumulation of these sorghum cultivars, and the result indicated that the Cd accumulation in stalks increased with maturity. The total absorbability of Cd ranged from 19.6 to 148 g/ha, and N6G60 sorghum showed the highest Cd accumulation with a concentration of 9.16 ppm in the stalk on a dry basis. The theoretical yield of bioethanol ranged from 5510 to 7510 L/ha. The overall performance of N6G60 and 15016 sorghums surpassed that of other sorghum cultivars because of their stronger capacities for Cd translocation and higher theoretical yields of bioethanol. Considering the experimental results, as well as the potential ethanol yield and growing situations of sorghums, 15016 sorghum was considered the cultivar showing the most promise for future applications.
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LWT-FOOD SCIENCE AND TECHNOLOGY
·
2021
·
IF 4.952
Qinglan Wu,Mingfei Ren,Xinxia Zhang,Cheng Li,Ting Li,Zhi Yang,Zhengxing Chen,Li Wang
Rice bran, an underutilized by-product obtained from outer rice layers, has received wide interest due to its abundance, eco-friendliness, and low cost. In this research, cellulose , hemicellulose and lignin as the main components of rice bran were fractionated, and their Cd(II) adsorption capacity, behavior and mechanism were further studied. The adsorption capacity of cellulose for Cd(II) was 5.79 mg/g within the equilibrium time of 10 min, which was 1.8 and 3.6 times those of hemicellulose and lignin, respectively. The Cd(II) adsorption onto cellulose exhibited monolayer surface behavior, whilst the heterogeneous adsorption behavior was observed for hemicellulose and lignin. These differences were related to the discrepancy of morphology and chemical composition in three polymers. The multi-hole sticks morphology of cellulose and porous blocky structure of hemicellulose were observed, while lignin showed compact and agglomerated blocky structure. Cellulose had numerous available adsorption sites including the oxygen-containing functional groups, which bonded with Cd(II) driven by chemical interaction. In conclusion, it highlights that cellulose from rice bran has the great potential of being applied as adsorbent for the Cd(II) removal.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Zhi Shen,Qiang Zhao,Hai-Quan Xie,Yu-Quan Feng,Shu-Yang Chen,Zhuo Shi
In this study, a multiple binding sites ligand, 5-(4-carboxyphenoxy)nicotinic acid ligand (H 2 cpna), was used to construct metal complexes with Zn 2+ , Cd 2+ , Mn 2+ and Co 2+ by solvothermal reaction, and four new complexes were constructed, namely, [Zn (cpna)•H2O]n (1)，[Cd (cpna) (CH 3 CN)·2H 2 O] n ( 2 ), [Mn (cpna)•2H 2 O] n ( 3 ) and Co(cpna)•2H 2 O] n ( 4 ); All the complexes were characterized by single crystal X-ray diffraction, elemental analysis and infrared analysis in the solid state; Single crystal x-ray diffraction analyses reveal that complexes 1 and 2 have two-dimensional network structures, complexes 3 and 4 have three-dimensional structures. In addition, Luminescence behavior of complex 1 and 2 was investigated and magnetic properties of complex 3 and 4 were studied. The fluorescent test results show that the fluorescence intensity of complex 1 is higher than that of ligand and emission band can be considered as LLCT emission of ligand; The Magnetic results indicate weak ferromagentic interactions in complex 3 and χ m T value rises slowly and then decreases sharply from 300 K to 2 K. However, magnetic results indicate antiferromagentic interactions in complex 4 and χ m T value can be divided into three parts with the change of temperature from 300 K to 2 K.
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高影响因子
Materials Today Communications
·
2020
·
IF 2.678
Xiaomei Zhang,Li Dou,Chengsong Peng,Liang Shi,Xiaoli Ji
A new method involving a coupling reaction and vacuum distillation (RVD) was introduced to prepare the β -CD cross-linking polymeric adsorbent (PCD RVD ). The preparation conditions, including the molar ratio of cross-linking agent and β -CD, dosage of the solvent, reaction time, and vacuum distillation temperature and time, were investigated in detail. Compared with a product prepared at normal pressure, PCD RVD possessed a lower content of β -CD, a higher content of carboxyl groups, a lower adsorption selectivity, and a higher efficiency as well as adsorption capacity to remove dyes methylene blue (MB), and Rhodamine B (RhB), methyl orange (MO). The PCD RVD was characterised by FT-IR, TG, and SEM, and was employed for the adsorption of MB and RhB from an aqueous solution. Results showed that the adsorption quantity of MB ( Q e,MB ) was higher than that of Q e,RhB , except in the acidic medium. The equilibrium data followed the Langmuir isotherm model, and the calculated Q m,MB and Q m,RhB were 250.0 mg/g and 231.5 mg/g, respectively. The adsorption kinetics fitted the pseudo-second-order model. It was inferred that PCD RVD exhibited a high adsorption capacity for both dyes due to its more homogeneous polymeric network formed during RVD and the higher content of carboxyl groups. The differences between Q e,MB and Q e,RhB were mainly attributed to the size of MB and RhB.
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