CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2024
·
IF 3.7
Xi Quan,Jun Zhang,Linlin Yin,Wei Zuo,Yu Tian
In this work, a novel composite material based on β-cyclodextrin-immobilized sodium alginate aerogel (β-CD/NaAlg) was developed utilizing cross-linker of epichlorohydrin and applied as an adsorbent to remove tetracycline antibiotics from reclaimed wastewater. A series of characterizations were utilized to confirm the successful synthesis of the adsorbent and this β-CD/NaAlg presented a three-dimensional network at the nano or micro scale. Under optimal conditions (pH=4, t =8 h, β-CD: NaAlg=9, adsorbent dosage=1.5 g·L –1 ), the maximum removal rate of β-CD/NaAlg to tetracycline was 70%. The adsorption behavior of tetracycline on β-CD/NaAlg conformed to the Freundlich isotherm model ( R 2 =0.9977) and the pseudo-second-order kinetic model ( R 2 =0.9993). Moreover, the adsorbent still removed 55.3% of tetracycline after 5 cycles. Specially, the adsorbent was integrated with ultrafiltration to adsorb tetracycline antibiotics from simulated reclaimed wastewater, and the removal rate of tetracycline reached 78.9% within 2 hours. The existence of Cr (VI) had a negligible impact on tetracycline removal, while the presence of humic acid exhibited a promoting effect. The possible adsorption mechanisms were also elucidated through X-ray photoelectron spectroscopy and density functional theory analysis. In summary, β-CD/NaAlg represents an environmentally friendly, efficient, and sustainable adsorbent for removing tetracycline antibiotics from reclaimed water.
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ADVANCED SYNTHESIS & CATALYSIS
·
2025
·Vol. 367
·期 17
·e70093
·
IF 4
Anirban Chowdhury,Akkammagari Putta Rangappa,Wenhua Xue,Yixuan Liu,Jun Zhao
The photocatalytic oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-diformylfuran (DFF) is a promising process with significant implications for sustainable energy and environmental applications. However, achieving highly selective DFF production from HMF remains a challenging task, particularly due to the dependency of molecular O 2 activation on the composition and exposed facets of nanomaterials. This study investigates the impact of different preferential facets of hydrothermally synthesized cadmium sulfide (CdS) morphologies—including hollow spheres, nanorods, and flower-like structures—on the photocatalytic oxidation of HMF to DFF. The findings reveal that the preferential CdS (002) facet and Cd vacancies in the hollow sphere morphology significantly enhance photocatalytic activity, achieving 68% HMF conversion and 89% selectivity for DFF production within 12 h of reaction time. This work highlights the critical role of material composition and facet orientation in optimizing photocatalytic processes for selective oxidation reactions, offering a potential strategy for the design of advanced photocatalysts in sustainable chemical production.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2018
·
IF 4.005
Zhongbo Shang,LiWen Zhang,Xuyang Zhao,Shanhu Liu,Deliang Li
A low-cost mercapto-modified coal gangue (CG-SH) was fabricated by modification of coal gangue (CG) with (3-mercaptopropyl) trimethoxysilane. The structure and composition for as-prepared CG-SH were characterized by using X-ray diffraction (XRD), Fourier transfer infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and X-ray fluorescence (XRF). Results indicated that larger amounts of mercapto-groups (-SH) was successfully introduced onto CG, which followed by acted as active sites for the removal of heavy metal cations, such as Pb(II), Cd(II) and Hg(II). The factors that affected the adsorption equilibrium as well as the removal efficiency, i.e., contact time, initial concentration, pH and temperature, were investigated in detail. The adsorption isotherms for Pb(II), Cd(II) and Hg(II) were well fitted with Langmuir model. The maximum adsorption capacity of CG-SH for Pb(II), Cd(II) and Hg(II) were calculated to be 332.8, 110.4 and 179.2 mg g −1 , respectively. The adsorption for Pb(II), Cd(II) and Hg(II) on CG-SH could be well described by pseudo-second-order kinetic model . And thermodynamic analysis suggests that the adsorption process for Pb(II) is exothermal, while that for Cd(II) and Hg(II) are endothermal. The results suggest CG-SH have great potential to be used as efficient absorbent for the removal of heavy metal cations from water.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Linyun Mou,Ya Lu,Jiale Ma,Shuwei Shu,Jianlong Li,Ganpeng Li
In response to the rapid quality degradation of peaches due to post-harvest decay, this study developed a composite film for preservation. Two primary pathogens responsible for peach decay, Aspergillus flavus and Talaromyces funiculosus , were identified. Molecular docking attributed to the main binding position of citral and geraniol's interactions with type I polyketide synthase on their antifungal effects, as well as the caffeic acid with its tyrosinase on antioxidant efficacy. β -CD-MOFs were synthesized via vapor diffusion, demonstrating exceptional spatial loading via SEM. CEOs (citral + geraniol) encapsulated in β -CD-MOFs were incorporated into a chitosan/pullulan matrix, yielding a film with 260.27 % fracture tensile strain, significantly ( P < 0.001) outperforming pure chitosan (21.87 %), possessing excellent mechanical properties, and the improvement in the water solubility of the film facilitates the release of active compounds. The utilization of a compositel film on peaches has shown significant efficacy in controlling decay index ( P < 0.05), weight loss ( P < 0.05), firmness ( P < 0.05) and production of malondialdehyde ( P < 0.05). Compared to untreated controls, the treated peaches exhibited an extended shelf life of 2 days, highlighting the superior preservation capabilities of the film. Hence, the film presents a promising solution for fruit preservation.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Shipeng Tang,Han-jian Hu,Xinyi Chang,Hongyan Zhang,Yu Chen,Yicheng Li,Wei-xiong Li,Xiaolong Hu,Xiaoyong Liao,Gang-Biao Jiang
Rational utilization of the competition among internal functional groups in chemical adsorbents for heavy metal ions can significantly enhance adsorption efficiency, while also driving the development of advanced adsorbents. This study proposes an innovative strategy employing a group competition mechanism to develop a dual-function platform for Cd(II) detection and adsorption, along with field detection applications. Nitrogen-doped graphene quantum dots (NGQDs) anchor the Cd(II) detection agent, 5,10,15,20-tetrakis(1-methyl-4-pyridinio)porphyrin tetra( p -toluenesulfonate) (TMPyP), onto sodium alginate chains to form an aerogel (T-NGQDs-CAA). FT-IR and XPS characterizations confirm that NGQDs facilitate a rapid Cd(II) transfer pathway through electrostatic interactions and π-π stacking. The Cd(II) detection speed of T-NGQDs-CAA is enhanced fivefold, while density functional theory analysis reveals that TMPyP exhibits a significantly stronger binding affinity toward Cd(II) compared to nitrogen- and oxygen-containing groups. Combined experimental and theoretical analyses demonstrate that this rapid ion transfer pathway intensifies TMPyP’s competition for Cd(II), thereby promoting the coordination reaction between TMPyP and Cd(II). Additionally, the Cd(II) adsorption by T-NGQDs-CAA follows the pseudo-second-order kinetic and Langmuir isotherm models, exhibiting a 148.7% increase in saturation adsorption capacity. This strategy, through constructing rapid ion channels with NGQDs and leveraging the group competition mechanism, enables in-situ Cd(II) detection and removal, enhancing the understanding and application of interactions between functional groups and metal ions.
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Journal of Building Engineering
·
2024
·
IF 6.7
Baomin Wang,Weigao Ding,Chengcheng Fan,Fei Liu,Wenxin Lu,Haoxiang Yang
C-S-H gel is a complex cementitious system, and the properties present significant difference with various Ca/Si ratios. The immobilization mechanism of three heavy metals in C-S-H gel at various Ca/Si ratios was investigated in this work from the prospect of the physical adsorption and chemical immobilization. Results showed that higher Ca/Si ratios can result in an increase in silicon chain polymerization, and lower BET specific area, and C-S-H gel with various Ca/Si ratios showed the excellent immobilization for heavy metals. Pb(II) and Zn(II) can form hydroxyl complex polyhedra in C-S-H under strongly alkaline environments, and increase the silicon chain polymerization degree similar to the doping of C-S-H gel by Al. However, Cd(II) was immobilized in the C-S-H gel with the formation of a solid solution under the action of ion exchange with Ca(II), rather than in the form of hydroxyl complex polyhedral and cadmium hydroxide coprecipitates. The highest adsorption capacity of Pb(II) was realized in C-S-H gel with a Ca/Si molar ratio of 0.9, reaching 95.6006 mg/g. Pb(II) was mainly immobilized in C-S-H gel via physical and chemical adsorption, and the effect of chemical adsorption tended to be significant as the Ca/Si molar ratio increased. And the formation of Pb 8 Ca(Si 2 O 7 ) 3 can be detected in C-S-H gel with a higher Ca/Si molar ratio.
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Nature Communications
·
2024
·Vol. 15
·期 1
·1-8
·
IF 14.7
Wang Xingzhi,Gao Yan,Liu Xiaonan,Xu Huaiyu,Liu Ruixiang,Song Jiaojiao,Li Bo,Shen Huaibin,Fan Fengjia
High-energy exciton emission could allow single-component multi-colour display or white light-emitting diodes. However, the thermal relaxation of high-energy excitons is much faster than the photon emission of them, making them non-emissive. Here, we report quantum dots with light hole-heavy hole splitting exhibiting strong high-energy exciton electroluminescence from high-lying light holes, opening a gate for high-performance multi-colour light sources. The high-energy electroluminescence can reach 44.5% of the band-edge heavy-hole exciton emission at an electron flux density Φ e of 0.71 × 10 19 s −1 cm −2 − 600 times lower than the photon flux density Φ p (4.3 × 10 21 s −1 cm −2 ) required for the similar ratio. Our simulation and experimental results suggest that the oscillator strength of heavy holes reduces more than that of light holes under electric fields. We attribute this as the main reason for strong light-hole electroluminescence. We observe this phenomenon in both Cd x Zn 1-x Se-ZnS and CdSe-CdS core-shell quantum dots exhibiting large light hole-heavy hole splittings.
研究领域:
材料科学
·
光电技术
·
纳米技术
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2025
·
IF 6.2
Mingtao Tan,Rui Qi,Linyi Meng,Shijie Du,Shanchun Yan,Dun Jiang
Heavy metals are significant environmental pollutants that contribute to widespread contamination. This study demonstrated that Cd transfer through the food chain imparts cross-tolerance to λ-cyhalothrin in Hyphantria cunea larvae. Cd-induced activation of the P450 detoxification system, particularly HcCYP6AE179 and HcCYP9A286, was identified as a critical mechanism for the development of pesticide cross-tolerance in Cd-exposed H. cunea larvae. The dual-luciferase reporter assays, RNAi, and agonist treatment experiment confirmed that HcAhr (Aryl hydrocarbon receptor) upregulated the expression of HcCYP6AE179 and HcCYP9A286. Additionally, H2O2 generation under Cd stress served as a key upstream signal for activating the HcAhr-HcCYP6AE179/HcCYP9A286 detoxification pathway. The nucleic-acid-based pesticides targeting HcAhr, HcCYP6AE179, and HcCYP9A286 exhibited superior stability, biosafety, and gene silencing efficacy. Treatment with these nucleic acid pesticides significantly reduced the tolerance of H. cunea larvae to λ-cyhalothrin in the CK and Cd groups. This work introduces novel approaches for mitigating pesticide cross-tolerance induced by heavy metals.
研究领域:
环境毒理学
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分子昆虫学
·
农药科学
·
RNA干扰
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生态毒理学
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Yuankun Liu,Qi Tao,Xinyu Guo,Jipeng Luo,Jinxing Li,Yongchao Liang,Tingqiang Li
Mineral nutrients play an important role in heavy metal uptake and accumulation in plant. However, the effects of calcium (Ca) supply level on apoplastic transport in roots and consequences for uptake of cadmium (Cd) in hyperaccumulators are poorly understood. Here, we investigated how Ca regulated the development of apoplastic barriers in the roots of two ecotypes of Sedum alfredii and assessed its effects on Cd uptake. Results of correlation analysis indicated that Ca content was positively correlated with the development of Casparian strips (CSs) and suberin lamellae (SL) in the absence or presence of Cd. Simultaneously, low Ca supply was proven to delay the formation of endodermis CSs and suberin accumulation by decreasing the relative expressions of genes associated with CSs localization and lignin/suberin synthesis. Moreover, Cd in apoplastic fluid and cell walls (regarding the apoplastic transport) and symplastic fractions were elevated by low Ca supply. Contrary to high Ca supply, the expression levels of genes related to Cd influx and xylem loading were increased upon low Ca addition in roots of both ecotypes. All the results above suggested that low Ca supply promotes root Cd uptake via apoplastic pathway by delaying apoplastic barriers development and also regulating Cd transport to the xylem in S. alfredii .
研究领域:
植物生理学
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环境科学
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植物修复
·
分子生物学
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TALANTA
·
2018
·
IF 4.244
Xiaorong Gan,Huimin Zhao,Kwok-Yin Wong,Dang Yuan Lei,Yaobin Zhang,Xie Quan
Surface functionalization is an effective strategy in the precise control of electronic surface states of two-dimensional materials for promoting their applications. In this study, based on the strong coordination interaction between the transition-metal centers and N atoms, the surface functionalization of few-layer MoS 2 nanosheets was successfully prepared by liquid phase exfoliation method in N, N-dimethylformamide (DMF), 1-methyl-2-pyrrolidinone, and formamide . The cytotoxicity of surface-functionalized MoS 2 nanosheets was for the first time evaluated by the methylthiazolyldiphenyl-tetrazoliumbromide assays. An electrochemical sensor was constructed based on glass carbon electrode (GCE) modified by MoS 2 nanosheets obtained in DMF, which exhibits relatively higher sensitivity to Cd 2+ detection and lower cytotoxicity against MCF-7 cells. The mechanisms of surface functionalization and selectively detecting Cd 2+ were investigated by density functional theory calculations together with various spectroscopic measurements. It was found that surface-functionalized MoS 2 nanosheets could be generated through Mo-N covalent bonds due to the orbital hybridization between the 5 s orbitals of Mo atoms and the 2p orbitals of N atoms of the solvent molecules. The high selectivity of the sensor is attributed to the coordination reaction between Cd 2+ and O donor atoms of DMF adsorbed on MoS 2 nanosheets. The robust anti-interference is ascribed to the strong binding energy of Cd 2+ and O atoms of DMF. Under the optimum conditions, the electrochemical sensor exhibits highly sensitive and selective assaying of Cd 2+ with a measured detection limit of 0.2 nM and a linear range from 2 nM to 20 μM.
研究领域:
材料科学
·
分析化学
·
生物医学
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CLEAN-Soil Air Water
·
2026
·Vol. 54
·期 1
·e70109
·
IF 1.4
Yun Xing,Xiangfei Zhang,Yuqi Zhou,Jingjing Guo,Yuan Huang,Xiaohan Xu,Jiankun Li,Dingyu Wang
The disposal of spent coffee grounds (SCG) not only represents a significant waste of resources but also poses environmental challenges, highlighting the need for effective pretreatment strategies to mitigate potential adverse effects. Incorporating metal oxides into biomass-based adsorbents can enhance their adsorption capacity for heavy metal ions by enhancing electrostatic attraction and increasing the number of accessible active sites. In this study, KMnO 4 -modified spent coffee grounds (KMnO 4 -SCGS) were successfully synthesized and applied for the removal of Cd(II) from aqueous solution. Key process parameters, including contact time, pH, initial Cd(II) concentration, temperature, and adsorbent dosage, were systematically investigated. Characterization using scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), and x-ray photoelectron spectroscopy (XPS) confirmed that KMnO 4 treatment increased the abundance of oxygen-containing functional groups and promoted the deposition of manganese oxides (MnO x ) on the adsorbent surface. The adsorption isotherm followed the Langmuir model, and the kinetics were well fitted by the pseudo-second-order model. The maximum Langmuir adsorption capacity of KMnO 4 -SCGS for Cd(II) was determined to be 49.54 mg/g at pH 5.0, and 298 K. Thermodynamic analysis indicated that the adsorption process was spontaneous and endothermic. The enhanced Cd(II) uptake was primarily attributed to the synergistic effect of MnO x and oxygen-containing functional groups, which facilitated the formation of surface complexes. In conclusion, KMnO 4 modification represents an effective strategy for developing high-performance adsorbents for Cd(II) removal.
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EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2020
·Vol. 2020
·期 42
·4007-4014
·
IF 2.529
Lu Qi,Zhaohui Chen,Lu Li,Qun Jing,Na Li,Zhongqi Jiang,Xiaoyu Dong,Ming-Hsien Lee
Two homologous new mixed-metal phosphates K 2 PbBi 2 (PO 4 ) 2 (P 2 O 7 ) ( I ) and Rb 2 CdBi 2 (PO 4 ) 2 (P 2 O 7 ) ( II ) were successfully synthesized in A 2 BBi 2 (PO 4 ) 2 (P 2 O 7 ) (A = K, Rb, B = Pb, Cd) system through the traditional high-temperature solid-phase method. The single crystal structures of the two compounds are shown to be the unique three-dimensional (3D) framework composed of different types of layers, but not isomorphic. We compared series compounds A 2 PbBi 2 (PO 4 ) 2 (P 2 O 7 ) (A = K, Rb, Cs), which are isomorphic and crystallize in the same space group Pnma . It is noteworthy that they are distinct different in degree of structural disorder, which is tuned by A-site cations. The effect of A-site cations is recognized by analyzing the disorder degree in three related structures and other available 182 mixed-metal phosphates. To the best of our knowledge, such structural analysis is rarely reported in inorganic phosphates and the cation modulation strategy can be used to guide structural disorder according to the difference-value (D-value) of cation radii. Furthermore, the syntheses, thermal analysis, relevant spectroscopic measurements and theoretical calculations for I and II compounds were also discussed. Graphical Two new mixed-metal phosphates K 2 PbBi 2 (PO 4 ) 2 (P 2 O 7 ) and Rb 2 CdBi 2 (PO 4 ) 2 (P 2 O 7 ) were firstly reported and the cation size effect has substantial influence on the crystal structural disorder combining with the title compounds and 182 phosphates.
研究领域:
无机化学
·
材料科学
·
晶体学
·
固态化学
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