ACS Applied Materials & Interfaces
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2018
·
IF 8.097
Dongfang Wang,Guilong Zhang,Zhangyu Dai,Linglin Zhou,Po Bian,Kang Zheng,Zhengyan Wu,Dongqing Cai
In this work, a novel nanosystem with a sandwich-like structure was synthesized via face-to-face combination of two pieces of waste cotton fabrics (CFs) carrying ferrous sulfide (FeS) and carboxyl-functionalized ferroferric oxide microsphere (CFFM), respectively, and the obtained nanosystem was named as FeS/CFFM/CF. Therein, FeS has high reduction and adsorption capabilities for hexavalent chromium (Cr(VI)), CFFM possesses a high adsorption ability on cadmium ion (Cd(II)) through electrostatic attraction and chelation, and CF displays high immobilization ability for FeS and CFFM and adsorption performance on Cd(II). FeS/CFFM/CF could simultaneously remove Cr(VI) and Cd(II) from water and inhibit the uptake of Cr and Cd by fish and water spinach, ensuring the food safety. Besides, this technology could efficiently control the migration of Cr(VI) and Cd(II) in the sand–soil mixture, which was favorable to prevent their wide diffusion. Importantly, FeS/CFFM/CF possessed a high flexibility and could be conveniently produced with needed scale and shape and easily separated from water and soil, displaying a promising approach to remediate Cr(VI)-/Cd(II)-contaminated water and soil and a huge application potential.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
·
IF 5.4
Xuefang Guo,Xiaoyong Liu,Shengxiao Cao,Yile Zhang,Ying Sun,Jing Qiao,Ben Fan,Xueqin Zhang
Silicone hydrogels have emerged as promising candidates for ocular drug delivery due to their exceptional oxygen permeability. However, their inherent hydrophobicity often results in suboptimal drug-loading capacity and patient discomfort. To address these limitations, this study introduces an innovative dual-network silicone/β-CD-HA hydrogel. In this design, the primary silicone network preserves high oxygen permeability, while the secondary β-CD-HA network enhances hydrophilicity and introduces additional drug-loading sites via host-guest interactions. Levofloxacin (LVF), a broad-spectrum antibiotic, was incorporated into the hydrogel through non-covalent binding with β-CD, and the system’s drug-loading capacity, sustained release profile, in vitro bactericidal activity, and post-loading properties were systematically evaluated. The results demonstrated a total LVF loading of 959.90 ± 36.60 μg/lens in the silicone/β-CD-HA hydrogel, with sustained release extending up to 8 h. Bactericidal assays revealed markedly reduced E. coli survival rates in treated groups: 14.46 ± 0.76 % (p < 0.0001) for LVF-loaded silicone hydrogel and 10.42 ± 1.66 % (p < 0.0001) for the β-CD-HA/silicone hydrogel, underscoring the enhanced antimicrobial efficacy of the dual-network system. The integration of β-CD-HA significantly improved hydrogel hydrophilicity, increasing equilibrium water content (EWC) from 27.69 ± 0.18 % to 45.60 ± 0.19 % and reducing the surface contact angle from 99.41 ± 0.24° to 70.36 ± 0.14°. Crucially, the modified hydrogel retained functionality-critical properties, exhibiting 93.45 ± 0.42 % light transmittance and 110.45 ± 0.32 barrer oxygen permeability values well within practical application standards. Post-drug-loading characterization showed minimal changes in oxygen permeability (105.47 ± 0.18 barrer), transmittance, or mechanical integrity, confirming structural stability. These findings collectively highlight the dual-network silicone/β-CD-HA hydrogel as a robust platform for extended ocular drug delivery, effectively balancing enhanced drug loading, sustained release kinetics, without compromising essential material properties.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
·
IF 5.4
Yingying Wang,Fuyu Zhang,Mengshuo Du,Bihe Chen,Yifeng Xu,Wenzhi Tang,Zhonghong Li
Highly toxic Pb(Ⅱ) and Cd(Ⅱ) persist in water and soil, disrupting ecosystems while threatening human health through bioaccumulation. Metal-organic frameworks (MOFs) as adsorbents toward heavy metal ions have garnered significant research attention. However, their adsorption capacity and retrieval are limited by small pore size and powder form. Herein, we designed a defective MIP-202 composite aerogel (DMCA) to efficiently remove Pb(Ⅱ) and Cd(Ⅱ). Mixed ligand (mercaptosuccinic acid) and modulator (butyric acid) were involved in the synthesis of MIP-202, and competed with the original amino acid ligand for binding to Zr clusters leading to the disruption of the original structure of MIP-202 and defect formation. Defective MIP-202 (D-MIP-202) possessed larger BET surface area (from 35.79 to 129.57 m 2 /g) and pore size (from 6.16 to 11.78 nm). Moreover, D-MIP-202 powder and sodium alginate were synthesized into DMCA with abundant adsorption sites and porous structures to enhance the sorption capacities, which were 434.7 mg/g (Pb(II)) and 202.6 mg/g (Cd(II)). The adsorption process primarily occurs on the heterogeneous surface of the material and represents a spontaneous chemisorption behavior. The adsorption mechanism is attributed to chelation, and ion exchange. This study presents an effective strategy for the remediation of heavy metal ions in aqueous systems.
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Nature Communications
·
2025
·Vol. 16
·期 1
·1-12
·
IF 15.7
Zhang Shipeng,Li Zhen,Li Menggang,Gu Yu,Han Ying,Zeng Ruijin,Tao Lu,Liu Youxing,Ye Na,Han Xiaocang,Luo Mingchuan,Zhao Xiaoxu,Yu Yan,Guo Shaojun,Zhang Jin
Dual-atom catalysts are a class of important catalytic systems for accelerating the kinetics of solid-phase conversion of K 2 S 2 to K 2 S in potassium-sulfur battery cathodes, yet their uncontrolled metal-metal interactions greatly limit their catalytic capability, leading to low conversion efficiency of potassium-sulfur batteries. Herein, we report the precise synthesis of Ga-Cd dual-atom catalysts with strong orbital electron coupling of p -block Ga and d -block Cd, anchored on hollow mesoporous carbon spheres (Ga-Cd DAs-HMCS) for boosting the performance of potassium-sulfur batteries. Ga shows strong adsorption capacity for potassium polysulfides, but lacks sufficient valence electrons to promote their conversion. We demonstrate that the introduction of Cd with a more filled valence electron configuration enables the transfer of electrons into the empty orbitals of Ga via strong orbital electron coupling, which enhances the catalytic ability of the Ga site to activate the S-S bond in potassium-sulfur chemistry, and thus accelerates the conversion kinetics from K 2 S 2 to K 2 S. This enables a S/Ga-Cd DAs-HMCS cathode material with an improved rate performance up to 589 mAh g −1 at 5 A g −1 .
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高影响因子
WATER RESEARCH
·
2024
·
IF 11.4
Shuang Zhang,Ziyi Sun,Tianying Zheng,Caijiao He,Daohui Lin
Nanoplastics (NPs) may act as carriers of heavy metals and cause complex toxicity to aquatic organisms, while the exact role of NPs in the joint toxicity remains unclear. Here, we investigated the joint toxicity of polystyrene NPs (PS-NPs) and Cd to freshwater algae ( Chlorella vulgaris ). It was found that PS-NPs (1 mg L −1 ) could hardly enter algal cells and slightly inhibit algal growth ( p < 0.01). The effect of PS-NPs as carriers on the joint toxicity of PS-NPs and heavy metals could be neglected because of the limited adsorption of Cd by PS-NPs, while the PS-NPs altered the cell wall structure and composition, which resulted in the increased algal absorption and toxicity of Cd. Compared to the low dose Cd (0.4 mg L −1 ) treatment alone, the extracellular and intracellular Cd contents in the cotreatment were significantly increased by 27.3 % and 18.0 %, respectively, due to the increased contents of cell wall polysaccharides (pectin and hemicellulose in particular) by the PS-NPs. Furthermore, after the high dose Cd (2 mg L −1 ) exposure, the inhibited polysaccharide biosynthesis and the loosen cell wall structure weakened the tolerance of cell wall to abiotic stress, facilitating the entry of PS-NPs into the algal cells and inducing the higher toxicity. These results elucidate the mechanism by which NPs enhance heavy metal toxicity to algae, providing a novel insight into environmental risks of NPs.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Dongdong Zhang,Huanhuan Li,Jingjing Li,Ziang Xu,Haozhe Liu,Yiping Zhao,Xia Feng,Li Chen
Heavy metal are harmful to the mankind and difficult to observe in water, so it is necessary for the detection and removal of metal ions. Carbon dots (CDs) are novel fluorescent materials for detecting metal ions and their modified nanocomposites have great potential for water treatment applications. Our research is developing a dual material of detecting and adsorbing metal ions based on poly acrylamide-co-CD-co-2-acrylamido-2-methylpropanesulfonic acid (poly (Am-CD-AMPS)) by inverse miniemulsion polymerization. Firstly, CDs were functionalized with glycidyl methacrylate (GMA) to obtain double bond which can be stably immobilized into the microgels network during the polymerization. The prepared poly (Am-CD-AMPS) microgels demonstrated the blue fluorescent property and excitation-dependent behavior under UV light and Fluorescence spectrophotometer. The microgels had sensitivity toward Hg 2+ , Fe 3+ and Cu 2+ and detection limit as low as 2.3 nM, 3.2 μM and 1.3 μM. Meanwhile, poly (Am-CD-AMPS) microgels had adsorption capacity of 102.13 mg·g −1 and 85.00 mg·g −1 toward to Fe 3+ and Cu 2+ , and detailing of the possible mechanistic insight into the ion adsorption was also discussed. Reusability measurements showed that the synthesized microgels had the better stability in application of detecting and adsorbing metal ions.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2016
·Vol. 16
·期 6
·6258-6264
·
IF 1.338
Lian Ting,Peng Mingli,Vermorken Alphons J. M,Jin Yanyan,Luo Zhiyi,Van de Ven Wim J. M,Wan Yinsheng,Hou Peng,Cui Yali
Curcumin, a polyphenol extracted from turmeric (Curcuma longa), has emerged as a potent multimodal cancer-preventing agent. It may attenuate the spread of cancer and render chemotherapy more effective. However, curcumin is neither well absorbed nor well retained in the blood,
resulting in low efficacy. In an attempt to enhance the potency and to improve the bioavailability of curcumin, new delivery agents, hydroxypropyl-beta-cyclodextrin (HP-β-CD)-modified GoldMag nanoparticles (CD-GMNs) were designed and synthesized to incorporate curcumin. The CD-GMNs
were characterized by Fourier Transform Infrared Spectroscopy (FT-IR), Thermo-gravimetric Analysis (TGA), X-ray Diffraction (XRD), Dynamic Light Scattering measurements (DLS), Transmission Electron Microscopy (TEM) and Vibrating Sample Magnetometer (VSM) analyses. For the magnetic carrier
of CD-GMNs, the content of HP-β-CD was 26.9 wt%. CD-GMNs have a saturation magnetization of 22.7 emu/g with an average hydrodynamic diameter of 80 nm. The curcumin loading, encapsulation efficiency and releasing properties in vitro were also investigated. The results showed
that the drug encapsulation ratio was 88% and the maximum curcumin loading capacity of CD-GMNs was 660 μg/5 mg. in vitro drug release studies showed a controlled and pH-sensitive curcumin release over a period of one week. Collectively, our data suggest that HP-β-CD-modified
GoldMag nanoparticles can be considered to form a promising delivery system for curcumin to tumor sites. Targeting can be achieved by the combined effects of the application of an external magnetic field and the effect on drug release of lower pH values often found in the tumor microenvironment.
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高影响因子
POLYMER
·
2017
·
IF 3.684
Jia-Min Li,Chuan-Shan Hu,Jian-Ming Shao,Hui-Juan Li,Peng-Yun Li,Xi-Chuan Li,Wei-Dong He
Ternary hydrogels composed of poly[acrylamide- co -2-(dimethylamino)ethyl methacrylate] [P(AM- co -DMAEMA)], poly(vinyl alcohol) (PVA) and β -cyclodextrin ( β -CD) were fabricated based on the multiple physical interactions such as inclusion complexation, hydrogen bonding and polymer crystallinity , and exhibited high storage modulus . To illustrate the individual role of each physical interaction, symmetrical investigation has been performed. P(AM- co -DMAEMA)s with two compositions , prepared by radical polymerization at −20 °C below the freezing point of reaction medium of water, were served as the inclusion guest for the inclusion host of β -CD. The inclusion complex between dimethylaminoethyl group of DMAEMA and β -CD was identified through 2D NOESY NMR spectroscopy . Hydrogen bonding between each pairs of hydrogel components was confirmed with FTIR analysis and contributed the second form of crosslinkage. Under freezing polymerization and further freezing-thawing treatment, PVA component tended to crystallize to serve as the third type of physical crosslinkage, which was recognized with X-ray diffraction. Rheological and thermo-gravimetrical analysis was used to inspect the modulus and thermal stability of the hydrogels, respectively. Three hydrogels of P(AM- co -DMAEMA)/PVA-g- β -CD, P(AM- co -DMAEMA)/PVA/ β -CD and P(AM- co -DMAEMA)/PVA were synthesized under the same condition to make the comparison. The whole results disclosed the strong dependence of hydrogel properties on the hydrogel components, reflecting the synergistic effects of different physical crosslinkages for the formation of those physical hydrogels.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 9
·8902-8913
·
IF 2.914
Sun Chen,Chen Tong,Huang Qunxing,Wang Jun,Lu Shengyong,Yan Jianhua
Novel KMnO 4 -treated magnetic biochar (FMBC) was successfully synthesized by addition of Fe(NO 3 ) 3 during carbonization and KMnO 4 treatment following for Pb(II) and Cd(II) adsorption. SEM-EDS, XPS, and ICP-AES were used to evaluate the FMBC and magnetic biochar (FBC) on surface morphology, surface chemistry characteristics, surface functional groups, and Pb(II) and Cd(II) adsorption behavior. Results showed that the Langmuir maximum adsorption quantity of FMBC reached 148 mg/g for Pb(II) and 79 mg/g for Cd(II), nearly 7 times of that of FBC. The enhancement of FMBC for heavy metal adsorption was due to the successful load of manganese oxides and the increased oxygen functional groups consistent with XPS and FTIR results. The adsorption capacities of FMBC were maintained over 95% when the pH value was higher than 2.5 and 3.5 for Pb(II) and Cd(II), respectively. The adsorption performances of both heavy metals by FMBC were hardly influenced by ionic strength and humid acid. The adsorption capacities of FMBC could maintain over 50% and 87% after four cycles for Pb(II) and Cd(II), respectively. The saturation magnetization of FMBC was about 11.5 emu/g, which did not change after adsorption. This work proposed a new method to fabricate a magnetic biochar with high adsorption capacities of heavy metals Pb(II) and Cd(II).
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JOURNAL OF SOILS AND SEDIMENTS
·
2021
·Vol. 21
·期 2
·775-783
·
IF 3.308
Du Huihui,Du Jingwei,Liu Fangyi,Zhang Yanhuan,Guo Hanwen,Wan Dan
Purpose Antibiotics often coexist with heavy metals in contaminated soils, making their behaviors more complicated than their individual presences. Sorption to soil components deeply affects the mobility, bioavailability, and fate of contaminants. However, limited studies have investigated the cosorption characteristics of tetracycline (TC) and heavy metals to typical soil minerals, particularly phyllosilicates. Materials and methods This study investigates the effect of Cd(II) on TC sorption by kaolinite (Kao, 1:1-type) and montmorillonite (Mont, 2:1-type) via isothermal adsorption, coupled with X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). Results and discussion Isothermal results show that TC sorption on both kaolinite (Kao, 1:1-type) and montmorillonite (Mont, 2:1-type) is little affected by Cd(II) at pH 4.5 but increases significantly at pH 8.5. The overall effect of Cd(II) on TC sorption depends on the intensities of two positive processes, i.e., (1) the formation of soluble Cd-TC complex increases sorption compared to free TC molecules and (2) the formation of a ternary clay-Cd-TC complex at clay variable edge sites increases sorption, and one negative process, i.e., competition of Cd(II) with cationic and zwitterionic TC species at the permanently charged sites decreases sorption. XRD analyses demonstrate that TC intercalates into the interlayer ( d 001 = 18.7 Å) of Mont as one monolayer parallel molecule both with and without Cd(II) but adsorbs predominately on external surface of Kao. FTIR results suggest a flat-lying horizontal configuration of adsorbed TC molecules on clays, accompanied by a strong complexation between the carbonyl and amino groups of TC molecules and the surfaces. Besides, the presence of Cd(II) more or less facilitates this complexation. Conclusions We propose that Cd(II) can significantly promote TC adsorption on clay minerals at alkaline pH rather than acidic pH. TC and Cd(II) interact intensely and form strong surface complexation on clay surfaces. Hence, coexistence with Cd(II) may lower the mobility and thus the bioavailability of TC in alkaline soils, which provides a new direction for soil remediation by regulating soil pH using alkaline materials. Graphical abstract
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JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Li-Hong Huang,Li-Ping Liu,Fu-Gang Chen,Yuan-Shu Hui
This article has been retracted: please see Elsevier Policy on Article Withdrawal ( http://www.elsevier.com/locate/withdrawalpolicy ). This article has been retracted at the request of the Editor-in-Chief. In investigating concerns brought up regarding the authenticity of the article, the editors reached out to the corresponding author for an explanation. The corresponding author failed to provide a satisfactory explanation. The editors therefore feel that the findings of the manuscript cannot be relied upon and that the article needs to be retracted.
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CHEMISTRY OF MATERIALS
·
2022
·
IF 10.508
Mao-Yin Ran,Sheng-Hua Zhou,Bingxuan Li,Wenbo Wei,Xin-Tao Wu,Hua Lin,Qi-Long Zhu
Simultaneous regulation and control of non-linear second-harmonic-generation (SHG) coefficients (deff) and linear birefringence (Δn) of non-centrosymmetric (NCS) crystals is a crucial aspect of improving the non-linear optical (NLO) performance, yet it remains a huge challenge in modern laser techniques and science. Herein, a series of melilite-type oxide-derived NCS oxychalcogenides, Sr2MGe2OS6 (M = Mn, Zn, and Cd), are successfully designed and synthesized through a facile partial isovalent chemical substitution strategy. These isostructural compounds crystallize in the tetragonal NCS space group P4̅21m (no. 113) and feature unique two-dimensional Cairo pentagonal tiling layers composed of heteroligand [GeOS3] and tetrahedral [MS4] asymmetric building units (ABUs). Compared to the parent melilite-type oxides, the derived title compounds not only successfully realize the phase matchability transformation [i.e., from non-phase-matching (NPM) to phase-matching (PM)] but also greatly improve the IR-NLO performance (especially, simultaneously boosting deff and Δn). Sr2CdGe2OS6 exhibits the best comprehensive performance among oxychalcogenides, including a wide PM cutoff edge (>525 nm), a strong deff (0.8 × AgGaS2), a giant laser-induced damage threshold (19.2 × AgGaS2), a large band gap (3.62 eV), as well as a broad transmission cutoff region (0.28–12.0 μm). Furthermore, highly distorted [GeOS3] ABU in this melilite-type structure is proved to be the profitable bifunctional NLO-active unit, which can contribute to the search and design of novel IR-NLO crystals with a large Δn and a strong deff based on the experimental results and theoretical calculations. This work demonstrates the first examples of PM melilite-type oxychalcogenides and offers new perspectives on the phase matchability transformation through the partial isovalent chemical substitution approach, which will play a constructive role in the future design of high-performance IR-NLO heteroanionic materials.
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