MICROCHEMICAL JOURNAL
·
2026
·
IF 5.2
Guo Chen,Guang-Zhen Wan,Juan Chen
The escalating global consumption of Traditional Chinese Medicine (TCM) necessitates robust quality control, particularly against contaminants like highly toxic hexavalent chromium (Cr(VI)), which must be distinguished from its essential trivalent counterpart (Cr(III)). In this study, a novel nanozyme-based colorimetric assay is presented for chromium detection, utilizing a zeolitic imidazolate framework-67 encapsulated iron-quercetin nanocomposite (Fe-QueNPs@ZIF-67). The core-shell nanostructure was synthesized through a facile one-pot method at room temperature, in which the ZIF-67 shell served as a sacrificial template to prevent agglomeration of the core Fe-QueNPs, thus preserving their intrinsic catalytic activity. In a buffer medium, the ZIF-67 framework disassembled, uniform dispersing Fe-QueNPs uniformly and releasing Co 2+ ions. A bimetallic complex was formed through synergistic coordination of Co 2+ with Fe 3+ and quercetin ligands, significantly enhancing the peroxidase-like activity of nanozyme. This improved catalytic activity promoted the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) by H₂O₂. Importantly, a differential response to chromium species was observed: the catalytic reaction was inhibited by Cr(III), leading to signal reduction, whereas it was promoted by Cr(VI), resulting in signal amplification. This dual-response modulation enabled selective and sensitive quantification of Cr(III) (linear range: 10–1000 μM, LOD: 8.8 μM) and Cr(VI) (linear range: 0.5–70 μM, LOD: 0.36 μM). The method was successfully applied to TCM samples, achieving excellent recoveries (95–105%). This work provides a robust and sensitive platform for chromium speciation, offering a promising tool for quality control of herbal medicines and broader environmental monitoring.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Xiangyu Wang,Weihong Su,Ping Ning,Iseult Lynch
To address the challenges posed by both the inherent limitations including aggregation and passivation of nano zero-valent iron (nZVI) and the treatment of acidic chromium-containing wastewater under mild conditions, a three-dimensional sulfonated covalent organic framework (SCOF) polyacrylonitrile (PAN) blended membrane loaded with nZVI (Fe 0 /SCOF-PAN) was fabricated via a green steam-assisted multiphase blending method combined with freeze-drying. Innovatively, SCOF was introduced into the PAN matrix to achieve dual modification, where the electrostatic repulsion provided by sulfonic acid groups significantly improved the dispersion of nZVI. Additionally, the membrane structure created acidic microenvironment within its cavities, effectively mitigating nZVI passivation. Experimental results demonstrated that the Fe 0 /SCOF-PAN composite exhibits excellent nZVI loading capacity and high Cr(VI) removal performance. Compared with unmodified PAN-supported nZVI, the Cr(VI) removal efficiency increased by 33.8%, and the loading capacity improved by 21.9 mg/g, while the removal efficiency remained above 90% in actual wastewater. Based on pseudo-first-order kinetics modeling, Sips isotherm analysis, thermodynamic studies, and XPS characterization, the high removal efficiency of Fe 0 /SCOF-PAN was attributed primarily to the redox reactions involving nZVI and its derived Fe 2+ species, supplemented by the active sites and functional groups of SCOF, which contributed through electrostatic attraction and chelation. This study presents a low-energy strategy for synthesizing SCOF-PAN blended membranes, offering a novel approach for designing high-performance nZVI supported materials and advancing the treatment of acidic chromium-laden industrial wastewater.
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Journal of Composites Science
·
2026
·Vol. 10
·期 6
·293
·
IF 4.6
Binbin Xu,Chaozhong Wang,Yang Liu,Jia Liu,Changliang Xu,Heming Wang,Longgui Peng
Coal-fired fly ash poses both environmental challenges and resource utilization potential. In this study, a fly ash-based geopolymer ecological remediation material (MFA-MB) was synthesized from fly ash and bentonite through alkaline roasting activation, montmorillonite acidification, and alkali-activated polycondensation. The structural characteristics and Cr(VI) adsorption performance of MFA-MB were systematically investigated. Compared with raw fly ash, MFA-MB exhibited a more developed mesoporous structure, increased surface activity, and enhanced specific surface area from 19.473 m2/g to 30.813 m2/g. Adsorption experiments demonstrated that MFA-MB showed enhanced Cr(VI) adsorption affinity and rapid adsorption equilibrium behavior. The adsorption process was exothermic and likely involved combined physical adsorption and surface interaction effects. Field experiments further showed that MFA-MB effectively reduced Cr(VI) accumulation in Chinese cabbage while promoting plant growth. At the optimal dosage, Cr concentrations decreased from 0.145 mg/kg to 0.015 mg/kg in roots and from 0.081 mg/kg to 0.009 mg/kg in leaves. These results suggest that MFA-MB exhibits promising potential for fly ash resource utilization and Cr(VI)-contaminated soil remediation.
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Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 5
·124516
·
IF 7.5
Bingkun Liu,Juncheng Guo,Hongda Huang,Yuhan Yang,Jingtao Zhang,Junling Zhang,Yonghui Zhang
Constructing a robust interfacial electric field is crucial for efficient spatial separation and directional migration of photogenerated carriers, which further boosts the performance of photocatalytic systems. In this study, a novel CF-supported SnS 2 /UiO-66-NH 2 high-low junction with intimate interface was fabricated via an in-situ solvothermal process. The optimal CF@SnS 2 /UiO-66-NH 2 -2 catalyst shows the best photocatalytic efficiency of 99.5% Cr(VI) removal at pH of 2.0 and nearly complete E. coli inactivation within 150 min, revealing its good photocatalytic redox capability. Moreover, the as-prepared composite possesses remarkable stability and desirable recycling performance. Mechanism analysis reveals that the intense internal electric field (IEF) and energy band bending are pivotal for promoting the separation and migration of charge carriers in the CF@SnS 2 /UiO-66-NH 2 high-low junction. This work offers new insights into the preparation and application of high-low junction photocatalysts.
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Journal of Cleaner Production
·
2023
·
IF 11.1
Xiunan Cai,Qingling Liu,Qing Yang,Fuzheng Fu,Yanjuan Zhang,Tao Gan,Huayu Hu,Zuqiang Huang
To effectively utilize the hazardous industrial solid waste manganese residue (MR), a MR-derived Fe 2 O 3 -baesd photocatalyst with efficient charge transfer, abundant reactive sites and high redox performance was developed for simultaneously removing organic pollutants and heavy metals . Herein, a novel “confined growth” strategy was proposed to fabricate an amorphous MnO 2 decorated α-Fe 2 O 3 @geopolymer sphere (A-MnO 2 /Fe 2 O 3 @GS) Z-scheme heterojunction by ion exchange method, which was used as a photo-Fenton catalyst for efficiently reducing Cr(VI) and degrading ciprofloxacin (CIP). Characterization results reveal that the 3D hydrangea-like MnO 2 with low crystallinity could not only capture and accelerate electron transfer but also act as an electron conduction bridge and a surface oxygen adsorption site, resulting in efficient separation and utilization of charge. More importantly, the photocatalytic reduction capacity was greatly enhanced in Z-scheme heterojunction owing to the lower conduction band potential of MnO 2 . A-MnO 2 /Fe 2 O 3 @GS showed excellent photocatalytic activity with CIP removal of 99.1% within 40 min and Cr(VI) removal of 97.6% within 50 min, which were 8.13 and 3.47 times higher than those catalyzed by Fe 2 O 3 @GS, respectively. This can be ascribed to the formation of intimate interface, internal electrostatic field , and rich structure defects in the Z-scheme heterojunction. This work offers a new idea to construct Z-scheme photocatalysts with high reactivity for environmental modification.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Xiaofei Fu,Junwu Tao,Zuming He,Yong Gao,Yongmei Xia,Zizhou Zhao
High-efficiency interfacial charge transfer is the key to achieve better spatial carrier separation, and thus to develop advanced heterogeneous photocatalysts for environmental remediation. However, It still remains a great challenge to design and exploit the effective charge transfer scheme. Herein, a novel Z-scheme In 2 S 3 /BiOBr with S−O covalent bonding was prepared by hydrothermal and subsequent thermal annealing methods. The obtained photocatalysts were systematically characterized and used for tetracycline hydrochloride degradation and Cr(VI) reduction in aqueous solution. As a result, the optimized In 2 S 3 /BiOBr heterostructure (IS/BOB-39) exhibited superior photocatalytic activities for tetracycline hydrochloride degradation and Cr(VI) reduction under simulated solar light irradiation compared with individual materials. The Z-scheme transfer mechanism was corroborated by trapping experiments, ESR and XPS analysis , which provided an effective transfer pathway for spatial separation of carriers. Moreover, the formation of chemical S−O bond between In 2 S 3 and BiOBr, which acted as a specific bridge to expediently transmit interfacial electrons, showed a synergistic effect with Z-scheme transfer model on the significantly enhanced photocatalytic performance. In addition, the In 2 S 3 /BiOBr heterojunction presented excellent cycle stability, resulting from the tight heterointerface. This work provides a promising approach to design and fabricate high effect Z-scheme heterojunction in wastewater treatment.
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INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Mianmian Wu,Nan Li,Shixiang Zuo,Wenjing Shen,Guifang Sun,Qingfei Li,Minghao Shi,Jiangquan Ma
Piezocatalysis is a promising technology to address environmental pollution by converting mechanical energy into chemical energy. Herein, MoSe2 nanosheets with different 1T phase percentages (ranging from 30 to 80%) were constructed by adjusting hydrothermal temperature. Moreover, the roles of phase engineering in the piezocatalysis were thoroughly investigated by degrading rhodamine B and reducing Cr(VI) in ultrasonic vibration conditions. In particular, MoSe2 prepared at 220 °C (MoSe2-220) exhibits ultrahigh observed constant kobs and degradation rate k, which is superior to most reported catalysts to date. The experimental results indicate that the introduction of the 1T phase increases the active sites of the material, improves the conductivity, and inhibits the recombination of electrons and holes. Moreover, an internal electric field in the 2H phase induced by piezoelectric polarization is facilitated to separate electron–hole pairs, enabling the degradation and reduction to proceed. The capture experiments and EPR tests further confirm that •O2– and •OH are main reactive species, and a rational mechanism is finally put forward. This study offers a clear understanding of phase engineering in piezocatalysis and provides an efficiency strategy to construct highly efficient piezocatalysts.
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PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 35
·e52822
·
IF 3.057
Hejia Chang,Qinghu Meng,Defa Liu,Yue Wu,Zhizhou Yang,Bin Sun,Fang Liu,Yu Liu
Synthesis of hollow spherical polyaniline (HSPANI) with the merits of facile strategy, low cost, low safety risk and high adsorption capacity of Cr(VI) is always a big challenge. In this manuscript, we proposed a facile way to preparation of HSPANI by using the poly(styrene-co-acrylic acid) sphere as template. The results indicated that HSPANI was emeraldine comprised of lots of basically uniform hollow spheres, and its average pore diameter was about 300 nm. HSPANI displayed high adsorption capacity of Cr(VI), and its value arrived at 601.3, 347.8, 235 mg g −1 at pH = 1, 2, and 3, respectively, which were high than many other adsorbents. The endothermic, spontaneous and chemical adsorption process was responsible for this adsorption. The Cr(VI) adsorption capacity was significant relied on its pH, contact time, Cr(VI) concentration and adsorption temperature. The adsorption behavior was well agreed with pseudo second-order equation and Redlich–Peterson isotherm models. HSPANI exhibited remarkable selectivity for adsorption of Cr(VI) even if the K + , Cu 2+ , NO 3 − and SO 4 2− were coexisted. HSPANI also displayed excellent regeneration performance. Therefore, this work not only provided a facile way to synthesis of hollow spherical polyaniline, but also supplied a potential adsorbent for adsorption of Cr(VI) from the industrial wastewater.
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CHINESE JOURNAL OF STRUCTURAL CHEMISTRY
·
2022
·
IF 0.847
Fazheng Huang,Xinhao Li,Zhen Zhang,Ziqi Jiang,Guoqiang Wang,Lingyun Li,Yan Yu
The exploration of a dual-functional sensor is the key to effectively detect the Cr(VI) and Fe(III) cations in water, which is important to human health and environmental sustainability. Because of the phase stability and excellent luminescence, the rare-earth coordination polymers have great potential as dual-functional sensors. Here, we develop a Y 0.91 Eu 0.09 (H 2 O) 2 {C 6 H 3 (CO 2 ) 3 }(MIL-92(Y):9%Eu 3+ )-based dual-function luminescent sensor on Cr(VI) and Fe(III), which exhibits excellent phase stability and dispersibility in water. The luminescence of MIL-92(Y):9%Eu 3+ aqueous suspension quenches on Fe 3+ with Stern-Volmer constant K sv of 1.79 × 10 3 M -1 and limit of detection of 17 μM. The MIL-92(Y):9%Eu 3+ aqueous suspension also has turn-off sensing ability towards Cr 2 O 7 2- and CrO 4 2- with K sv values of 3.5 × 10 3 and 6.14 × 10 3 M -1 , respectively. It has detection limitations of 10 and 5 μM on Cr 2 O 7 2- and Cr 2 O 7 2- ions, respectively.
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Materials
·
2022
·Vol. 15
·期 5
·1733
·
IF 3.748
Jinyu Zhang,Cai Jing,Binsong Wang
A signal shut-off probe of Si, N-codoped carbon quantum dots (Si, N-CQDs) was exploited to detect Cr(VI) by fluorescence quenching without the aid of any biomolecules or labeling materials. The sensing system prepared the precursor of diacetone acrylamide and the silane coupling agent 3-aminopropyltriethoxysilane (KH-550) by a simple hydrothermal method, and the quantum yield is as high as 75% Si, N-CQDs. The fluorescence stability and microstructure of the Si, N-CQDs were studied. The Si, N-CQDs has a high sensitivity for detecting Cr(VI) with the linear range of 0–200 μM and the detection limit of 0.995 μM. The quenching mechanism of Si, N-CQDs is attributed to FRET.Keywords:Si,N-codoped carbon quantum dots;hexavalent chromium;fluorescence sensor;mechanism attributed to FRET
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PubMed
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2022
·Vol. 32
·期 3
·840-853
·
IF 3.518
Cui Can,Xie Ya-Dian,Niu Jiao-Jiao,Hu Hai-Liang,Lin Sen
In this work, three different generations of Poly(amidoamine) dendrimers (PAMAM) decorated on magnetic Fe 3 O 4 composites (Fe 3 O 4 @SiO 2 –G1, Fe 3 O 4 @SiO 2 –G3, Fe 3 O 4 @SiO 2 –G5) were fabricated and characterized by FTIR, XRD, TEM, TGA, VSM and XPS. The obtained composites were used for Cr(VI) removal. Batch adsorption studies showed that the adsorption reached equilibrium within 60 min, and the optimal pH was 3.0. The result of adsorption kinetics was simulated by the pseudo-second-order model. The adsorption equilibrium isotherm was well fitted with the Langmuir adsorption model. Furthermore, thermodynamics calculations revealed that the adsorption process was endothermic and spontaneous. Importantly, adsorption capacity of Cr(VI) obeyed the sequence of Fe 3 O 4 @SiO 2 –G1 < Fe 3 O 4 @SiO 2 –G5 < Fe 3 O 4 @SiO 2 –G3, 3 generation of PAMAM (G3) was the optimal for adsorption capacity of Cr(VI). The maximum theoretical Cr(VI) adsorption capacity ( q m ) of Fe 3 O 4 @SiO 2 –G3 was 334.45 mg/g, and removal ration remained above 89.5% after five cycles of adsorption–desorption. Thus, Fe 3 O 4 @SiO 2 –G3 is predicted to be an efficient adsorbent for the adsorption of Cr(VI) from aqueous solution, and the obtained results can help in the generation optimization during fabrication of dendrimer modified adsorbents.
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CHEMICAL PHYSICS LETTERS
·
2022
·
IF 2.719
Sijing Zeng,Dengjie Zhong,Yunlan Xu,Nianbing Zhong
D201@S-nZVI was synthesized to remove Cr(VI) from aqueous solution. Batch experiments demonstrate it has excellent removal performance, recycling performance and longevity. Its removal efficiency and maximum adsorption capacity reaches 89.67% and 137.35 mg·g −1 for 100 mg·L −1 Cr(VI) solution, respectively. This is because S-nZVI (nZVI@FeS x ) has a core-shell structure. The FeS x layer prevents the leaching of iron and has excellent reduction and electron transport capability. In addition, the functional groups of D201 can electrostatically attract Cr(VI), and its unique skeleton structure well disperses S-nZVI. The adsorption is a spontaneous exothermic process. This research provides an effective remediation material for Cr(VI) wastewater.
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