ACS Sustainable Chemistry & Engineering
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2023
·
IF 8.4
Wenzhong Wang,Xuting Bai,Hao Zhou,Jiajia Shan,Xue Wang
The synthesis of carbon quantum dots (CQDs) from renewable resources is extensively regarded as a green approach, but this method is generally accompanied by high energy consumption and complex byproducts, which limit the large-scale production of CQDs. In this work, titanium carbide-derived CQDs (TiC-CQDs) were synthesized only by mixing titanium carbide and hydrogen peroxide (1 wt %) at room temperature. The resulting byproduct was converted to a precipitate by sodium hydroxide to purify the TiC-CQDs, and the reaction mechanism was further explored. The average lateral size of TiC-CQDs is 4.2 ± 1.1 nm and shows excellent fluorescence properties. Moreover, in an acetic acid-sodium acetate buffer solution, the fluorescence of TiC-CQDs could be selectively quenched by a ferric ion (Fe3+) with a broad concentration range of 0.2–5 μM and 5–60 μM and a detection limit as low as 0.14 μM. Due to the absence of the energy input, complex equipment, and nontoxic and harmless precursors, the novel room-temperature synthesis route of TiC-CQDs is energy-efficient, safe, green, and economical, and has great potential in industrial application.
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JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Yanan Deng,Aihua Zhang,Zheng Zhang,Yidan Xu,Gaiye Li,Montree Hankoy,Mettaya Kitiwan,Shaoyu Wu,Ping Dong,Yang Nan,Weixing Xu,Jianfeng Zhang
Incorporating nanomaterials for a thin film nanocomposite (TFN) layer has been verified effective to improve the separation performance of nanofiltration (NF) membranes, whereas the poor compatibility between nanomaterials and polyamide (PA) matrix leads to a decrease in the salt rejection and pollution resistance. In this study, inspired by a new interface-bridging idea, Ti 3 C 2 T x was bonded with tannic acid-Fe(III) (TA-Fe(III)) complexes, and then incorporated into a PA matrix for the first time to obtain a novel TFN NF membrane. The introduction of TA-Ti 3 C 2 T x was found to effectively reduce the diffusion of piperazine, and thus result in the induction of a thinner, lower roughness, more hydrophilic, and defect-free PA layer. With the addition of 0.015 wt% TA-Ti 3 C 2 T x , the TFN membrane obtained the highest water permeability of 12.17 L m −2 h −1 bar −1 , almost twice that of the pristine membrane, with a high Na 2 SO 4 rejection above 97 %. In addition, the TA-Ti 3 C 2 T x -filled TFN membranes were verified to exhibit excellent antifouling performance and pressure resistance with a high durability, which is crucial for the practical application in salinity water treatment. This study provides an effective strategy to tailor the interfacial microstructural of nanoparticle-filled NF membranes for superior divalent-salinity-water separation.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Baocheng Zhou,Ying Liu,Wei Zhao,Changhao Bian,Pengfei Sun
In this study, a new graphitic carbon nitride (CN) catalyst was synthesized by combining 5-sulfonic-8-hydroxyquinoline (SQ) and Fe (III) ions. Photocatalysis reduction of nitroaromatic compounds was employed to evaluate the catalytic performance of the synthesized catalyst. Compared to the pristine CN, the optimized CN-SQ-2-Fe photocatalyst showed enhanced absorption in visible light region, which promoted photogenerated charge transfer and separation. Herein, we also developed a green and efficient photocatalysis route to convert nitrophenols (NPs) into aminophenols (APs) using CN-SQ-2-Fe photocatalyst. The visible light, separation of photogenerated charges and carrier transportation of the optimized sample CN-SQ-2-Fe were significantly improved in comparison with the pristine CN and the modified samples of CN-Fe and CN-SQ-2. Accordingly, the CN-SQ-2-Fe showed a high conversion (96%) of p- nitrophenol ( p- NP) to p- aminophenol ( p- AP) under visible light irradiation for 2 h and possessed high photocatalytic durability. Different NP compounds were also studied under the condition of photocatalysis reduction and demonstrated high conversion (>97%). Finally, a possible mechanism was proposed for the photocatalytic reduction of p- NP by CN-SQ-2-Fe. This work provides an effective approach to prepare graphitic carbon nitride (CN) modified by 5-sulfonic-8-hydroxyquinoline (SQ) and Fe (III) ions, which is a potential visible light driven photocatalyst for the reduction of nitrobenzene derivatives.
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CHEMICAL ENGINEERING JOURNAL
·
2023
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IF 15.1
Maolin Wang,Yaling Wang,Xudong Jing,Jiahui Xu,Min Li,Qing Xie,Xiyun Cai
Iron-activated persulfate (PS) systems commonly suffer from the poor Fe(III)/Fe(II) redox cycle in groundwater and soils, due to the rapid oxidation of Fe(II) by both PS-related and naturally occurring oxidative substances. Maintaining the Fe(III)/Fe(II) redox cycle is necessary to achieve the high efficiency and stability of iron-activated persulfate systems toward aromatic contaminants (e.g., PAHs) in groundwater and soils. Herein, we discover the mixtures of dithionite (DTN) and zerovalent iron (ZVI) to synergistically activate PS, and develop highly efficient, stable DTN-ZVI/PS systems for PAHs removal in groundwater and soils. DTN and intermediates sulfite/thiosulfate initiated reduction of ZVI-derived Fe(III) species in DTN-ZVI/PS systems. This reaction accelerated the Fe(III)/Fe(II) redox cycle and coated ZVI with FeS x , both favoring the generation of HO and SO 4 − . DTN-ZVI/PS exhibited Nap removal of >90% in water during 11 of 15 supplementations of Nap and/or PS, 1.4–2.4 times ZVI/PS. Similarly, 0.47–4.3 fold increments of Nap removal k obs were obtained in five chemical types of groundwater, and 1.3–2.4 fold increments of PAHs removal in soils. This study may provide a technical basis to develop new Fe-activated oxidation systems for groundwater and soil remediation .
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MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 7
·2291-2298
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IF 4.58
Wu Huifang,Jiang Jiahui,Gu Xiaoting,Tong Changlun
Nitrogen and sulfur co-doped carbon quantum dots (N,S-CQDs) with a high quantum yield (69%) and excellent photoluminescent properties were synthesized via a facile hydrothermal method using citric acid and cysteine as precursors. The cytotoxicity of N,S-CQDs was evaluated through the MTT assays using HepG2 cells as the target. The cell viability is still >95% after a 24 h incubation with particles in a concentration of up to 300 μg·mL −1 , thereby indicating low cytotoxicity and excellent biocompatibility of N,S-CQDs. The emission spectra of the N,S-CQDs are nearly independent of the excitation wavelengths in the range from 280 to 380 nm and have the strongest fluorescence emission centered at 415 nm. Co-doping with N and S promotes the electron-transfer rate and coordination interaction between N,S-CQDs and Fe(III) ions which acts as a quencher of fluorescence. Fluorescence can be recovered, however, by addition of L-Cys. Hence, the N,S-CQDs act as a highly sensitive and selective “turn-off-on” probe for the determination of Fe(III) or Cys. The limits of detection are 14 nM for Fe(III) and 0.54 μM for Cys. The interferences by 17 common metal ions and heavy metal ions, 12 other quenchers and 16 amino acids were investigated and found to be tolerable. The probe was successfully applied for cellular imaging of Fe(III) in HepG2 cells by using fluorescence microscopy.
Nitrogen and sulfur co-doped carbon quantum dots (N,S-CQDs) with a high quantum yield of 69% were prepared through a facile one-step hydrothermal method. They are shown to be a highly sensitive and selective fluorescent “turn-off-on” probe for Fe(III) ions and cysteine.
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FOOD CHEMISTRY
·
2025
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IF 9.8
Sujuan Sun,Junqing Yang,Gang-Gang Yang,Xiaoxiao Wang,Xinya Han
A simple and sensitive method for monitoring the freshness of meat products is crucial for safeguarding food hygiene and human health. Here, we synthesized an environmentally friendly β -CD@Fe nanozyme through a one-pot solvothermal method, enabling colorimetric and photothermal dual-mode detection of hypoxanthine (Hx). In the xanthine oxidase (XOD)/nanozyme enzymatic cascade system, Hx ultimately led to the oxidation of colorless TMB to blue oxTMB, accompanied by enhanced absorbance at 652 nm and an increased temperature under 808 nm laser irradiation. The proposed dual-mode assay for Hx exhibited a good linear relationship in the range of 1–40 μM, achieving low detection limits of 0.29 μM (colorimetric) and 1.0 μM (photothermal), respectively. The β -CD@Fe nanozyme, characterized by its environmental friendliness, mild synthesis conditions, and high peroxidase-like activity, was successfully applied for the sensitive analysis of Hx in actual meat samples. This advancement offers promising potential for applications in food safety supervision.
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Sustainable Materials and Technologies
·
2024
·
IF 8.6
Yijun Chen,Meina Cheng,Hailiang Yang,Sanjian Ma,Long Jin,Zixia Lin,Xin Liu
The traditional Fenton process has two issues that hinder its further application and promotion. One is the generation of large amounts of iron sludge. The other is the safe storage and transport of explosive H 2 O 2 . The problems could be solved by accelerating to regenerate Fe(II) and realizing to self-generate H 2 O 2 . The key to the solution lies in the use of reducing active hydrogen [H] to supply electrons. The effect of different loading methods of Pd 0 nanoparticles (NPs), active centres for [H] generation, on the catalytic performance is unknown. Herein, the Pd/UiO-66(Zr) (Pd 0 NPs loaded on the surface of UiO-66(Zr)) and Pd@UiO-66(Zr) (Pd 0 NPs confined into the pores of UiO-66(Zr)) were synthesized. It confirmed that the [H] could be used to promote to regenerate Fe(II) and self-generate H 2 O 2 . Using only a trace amount of ferrous (25 μM) and without H 2 O 2 , the trimethoprim (20 mg·L −1 ) could be thoroughly removed within 90 min. Moreover, the stability of Pd@UiO-66(Zr) was slightly superior to that of Pd/UiO-66(Zr) because of the confinement effect of pore wall on Pd 0 NPs, as well as the interception effect on the intermediate products that can be complexed with Pd 0 NPs.
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Frontiers in Chemistry
·
2025
·
IF 4.2
Xianbing Zhang,Yuheng Liu,Jiajia Yuan
Metal-organic frameworks (MOFs) are recognized as important Fenton-like materials for environmental remediation. However, their applications are often hindered by slow cycling between Fe (III) and Fe (II). This study aimed to address the slow Fe (III)/Fe (II) cycling limitation of Fe-MOFs through dual modification strategy: bimetallic modification and amino functionalization. A series of NH2-MOF(Fe, Co) catalysts with varying Fe/Co ratios were synthesized via a hydrothermal method and evaluated for sulfamethoxazole (SMX) degradation. The optimized NH2-MOF(Fe, Co) catalyst (Fe/Co ratio = 7:3) exhibited substantially enhanced catalytic performance, with SMX removal rate and rate constant in the H2O2 system being 3.2 and 43.5 times higher than those of the Fe-MOF/H2O2 system, respectively. The catalyst demonstrated robust performance across a wide pH range (3.05–7.00), addressing a common limitation of Fenton-like systems. Physicochemical characterization revealed that the enhanced performance was attributed to two key factors: the synergistic effect between Co and Fe in the bimetallic active center, and improved electron transfer to the central metal due to -NH2 functionalization. These modifications effectively addressed the Fe (III)/Fe (II) redox cycling limitation. The proposed reaction mechanism provides insights into SMX degradation pathways in the NH2-MOF(Fe, Co)/H2O2 system. This study presents an efficient and stable MOF-based Fenton-like catalyst with potential applications in wastewater treatment and environmental remediation.
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DESALINATION
·
2025
·
IF 9.8
Tong Wei,Kai Li,Senlin Shao,Gang Wen,Jianwei Bu,Tinglin Huang
Nanofiltration membranes (NFMs) are promising candidates for advanced drinking water treatment due to their excellent retention capabilities, however, their widespread application is limited by low water permeance and susceptibility to inorganic scaling. In this study, Fe(III)-tannic acid‑molybdenum disulfide (Fe(III)-TA-MoS 2 ) nanosheets were synthesized and employed as an interlayer material for NFM fabrication. The resulting NFMs were then created through interfacial polymerization, labeled as MoS 2 -1.5, MoS 2 -3.0, and MoS 2 -4.5 based on varying materials loading. Experimental results indicated that the membrane morphology, surface roughness, electronegativity, amine group content, hydrophilicity, selectivity, and resistance to inorganic scaling were all affected by the amount of Fe(III)-TA-MoS 2 loading. The MoS 2 -3.0 NFM exhibited the highest roughness and uniformity (Ra: 111.25 ± 3.30 nm), along with enhanced hydrophilicity and the smallest pore size (0.39 nm) among the Fe(III)-TA-MoS 2 NFMs. These characteristics contributed to a high water permeance of 20.19 LMH/bar. Sulfate rejection decreased notably with increasing amine content, while calcium ion rejection showed a slight decline as surface electronegativity increased. Notably, the pore size of the Fe(III)-TA-MoS 2 NFMs remained largely unchanged at low and moderate loadings. Although the MoS 2 -4.5 NFM exhibited even higher water permeance and electronegativity, its surface structure underwent significant changes, leading to inferior performance in terms of scaling resistance and natural organic matter removal compared to the MoS 2 -3.0 membrane. Overall, this study provides a novel strategy for enhance both water permeability and anti-scaling performance of NFMs, offering potential cost reductions for drinking water treatment applications.
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Acta Biomaterialia
·
2022
·
IF 10.633
Longyi Nan,Jie Liu,Chao Liu,Peng Quan,Jianpeng Guo,Liang Fang
Pressure-sensitive adhesives are critical to the product's safety, efficacy, and quality in transdermal drug delivery systems. However, many defects of transdermal patches ( e.g. , insufficient adhesion, patch displacement, and “dark ring” phenomenon) remain. Herein, the N -[tris(hydroxymethyl)methyl]acrylamide (NAT)-modified acrylic pressure-sensitive adhesive coordinated with Fe(III) (AA-NAT/Fe 3+ ) was creatively proposed. Results demonstrated that the adhesiveness and cohesiveness of the optimized AA-NAT/Fe 3+ were higher by 1.8- and 9.7-fold, respectively, than those of commercially available DURO-TAK® 87-4098 due to the hydrogen bonding interaction of NAT-skin interface and coordination of NAT-Fe 3+ . Moreover, compared with that of DURO-TAK® 87-4098, the adhesion time of AA-NAT/Fe 3+ on the human forearm was remarkably prolonged, and no “dark ring” phenomenon was observed for AA-NAT/Fe 3+ after removal. After clonidine (CLO) was loaded into AA-NAT/Fe 3+ , controlled drug release and a drug transdermal behavior were endowed for CLO@AA-NAT/Fe 3+ in vitro and in vivo . AA-NAT/Fe 3+ still maintained superiority in adhesion and cohesion properties after CLO loading. These observations would contribute to the development of pressure-sensitive adhesives with outstanding adhesion and cohesion for transdermal patches. Statement of significance This N -[tris(hydroxymethyl)methyl]acrylamide-modified acrylic pressure-sensitive adhesive coordinated with Fe(III) has enhanced adhesion and cohesion properties, which provide a simple but effective strategy to solve the problems ( e.g. , insufficient adhesion, patch displacement, and “dark ring” phenomenon) in existing transdermal patches.
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JOURNAL OF INORGANIC BIOCHEMISTRY
·
2021
·
IF 4.155
Yueqin Li,Changhao Qian,Yun Li,Yong Yang,Dong Lin,Xiaohui Liu,Chen Chen
Two novel Fe(III) complexes, Fe(HL 1 ) 2 Cl·1.25H 2 O ( 1 ) and Fe(HL 2 ) 2 ·Et 3 NH·H 2 O ( 2 ) (H 2 L 1 = o -vanillin benzoylhydrazone, H 3 L 2 = o -vanillin salicylhydrazone) are prepared. X-ray single crystal diffraction confirms that the hydrazone ligands can be chelated to iron centre resulting in a six-coordinate octahedral configuration. Both complexes show major intercalation effect to the herring sperm deoxyribonucleic acid (HS-DNA) with high binding constants of 2.01 × 10 4 M −1 and 2.24 × 10 4 M −1 , respectively. Molecular docking studies reveal both complexes can intercalate at the gap of DC5-DG2 and DG6-DC1 base pairs of DNA hexamer (1Z3F). The interaction of the complex 1 with plasmid pBR322 DNA induces distinguishable alterations of the DNA morphology. Further, the structure of plasmid pBR322 DNA treated with complex 1 in the presence of ascorbic acid has been damaged probably due to the reactive oxygen species (ROS) generation. What's more, both complexes show high affinity with bovine serum albumin (BSA), the binding constants measured by fluorescence techniques are 5.75 × 10 6 M −1 and 4.39 × 10 7 M −1 , respectively. Molecular docking demonstrates that the complexes prefer the binding pocket of site III (subdomain IIB) of BSA (PDB ID: 4F5S ). Similarly, dynamic light scattering (DLS) reveals that the complexes not only bind to BSA but also induce bigger size aggregates as the concentration increases.
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JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Shengpeng Liu,Gen Cheng,Yun Xiong,Yigang Ding,Xiaogang Luo
Due to strong activity, it is very difficult to remove low concentrations of bromide in medical wastewater by traditional method, thus highly effective and greener adsorbents should be utilized to design. In this work, the cellulose beads (CBs) were modified by the TEMPO-mediated oxidation and then bonded with Fe 3+ to fabricate Fe(III)-complexed carboxylated cellulose beads (Fe-CCBs) adsorbents. Structure and properties of Fe-CCBs were analyzed using Energy dispersive spectrum (EDS), Scanning electron microscopy (SEM), Fourier transform infrared spectrum (FT-IR), total acidity and basicity groups, X-ray diffraction (XRD), N 2 adsorption-desorption and Thermogravimetric (TGA). Moreover, batch adsorption experiments showed that the adsorption of Br − was better consistent with general-order kinetic model and Liu isotherm model, which could also further clarify the adsorption process mechanism. Meanwhile, the results revealed that removal of Br- was a spontaneous exothermic process and was more suitable to be carried out under neutral or acidic conditions. Furthermore, the mechanism of adsorption behavior of bromide ions on Fe-CCBs was based on a combination of electrostatic attraction and outer-sphere complexation. The results of this study can provide guidance for the design of novel material adsorbents and the removal of harmful anions from aqueous solutions.
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