Toxics
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2024
·Vol. 12
·期 5
·325
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IF 3.9
Ge Song,Honglian Tan,Chuhan Cheng,Peng Li,Xinyang Sun,Yuling Zhou,Yong Fang
Hexavalent chromium (Cr(VI)) is known as the most hazardous species of chromium. Speciation analysis of Cr in foods is of a great significance for assessing its influences on human health. In this study, a fast HPLC-ICP-MS method for the determination of Cr(VI) was developed for determining the content of Cr(VI) and also investigating its transformation in foods. The developed method employs an alkali extraction and weak anion-exchange column separation for distinguishing the Cr species, facilitating accurate Cr(VI) quantification within 1.5 min. This technique was applied to determine the Cr(VI) levels in a range of food products, including yoghurt, milk powder, rice flour, orange juice, green tea, white vinegar, and whole wheat bread. The results showed that no Cr(VI) was detected in these food products. Spiking experiments revealed that the recovery rate of Cr(VI) decreased with the increase in its contact time with food products. A further exploration of Cr(VI) in various food components such as vitamin C, tea polyphenols, whey proteins, gelatin, fructose, and cellulose indicated the conversion of Cr(VI) to organic Cr(III) over a period from 20 min to 60 h. It was found that high temperatures and acidic conditions accelerated the rate of Cr(VI) conversion to organic Cr(III) in the six food components mentioned above. This evidence suggests that natural reducing substances in foods probably prevent the occurrence of Cr(VI).
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
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IF 7.7
Xikun Zhang,He Zhang,Xue Lv,Ting Xie,Junzheng Chen,Di Fang,Shurui Yi
Dye wastewater poses a serious threat to the environment and human health, necessitating sustainable degradation methods. In this study, Na-based Montmorillonite (MMT) was exfoliated using different ionic liquids ([C16MIM][Cl], [C16MIM][BF 4 ], [C16MIM][PF 6 ]), and silver nanoparticles (Ag NPs) were green-synthesized using hydroxypropyl cellulose (HPC). The HPC significantly enhanced the dispersion of MMT in the hydrogel. By introducing lauryl methacrylate (LMA), a hydrophobic associative network was constructed in PAM/LMA/HPC/MMT@ILs&Ag NPs hydrogel. This hydrogel demonstrated outstanding mechanical properties, with a stress of 833.21 kPa, strain of 3300 %, and toughness of 14.36 MJ/m 3 . It also exhibited excellent catalytic activity, with a rate constant of 0.83 min −1 for 4-nitrophenol degradation at 28 °C. The effects of temperature and catalyst concentration on the catalytic reaction were systematically investigated. This study presents a simple green synthesis approach for Ag NPs using HPC, achieving superior mechanical performance and stable MMT dispersion in aqueous solutions.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Luping Feng,Jianghong Wang,Lixiang Zhang,Jiadong Li,Yifan Zhang,Minghong Xu,Peisong Tang,Hua Wang
Tubular Co 9 S 8 /CdS heterostructures have been successfully synthesized by in-situ growing CdS onto Co 9 S 8 nanotubes through a simultaneous immobilization and in-situ reduction strategy. It turned out that the so-obtained heterostructure with Co 9 S 8 /CdS molar ratio of 1/10 can display a broad light absorption edge and especially much enhanced capacity for photocatalytic reduction of Cr(VI) under visible light . The characterization analysis and experimental results suggested that an interfacial electrostatic field between Co 9 S 8 and CdS elements in the heterostructure could be constructed due to their different Fermi levels , allowing for more quantities of highly reductive electrons to participate in the photocatalytic reaction. Therefore, the so-obtained Co 9 S 8 /CdS (1/10) heterostructures could achieve the photocatalytic reduction efficiency of 100% within 20 min, which was more than two and four times larger than that of pristine CdS and Co 9 S 8 , respectively. Moreover, the possible photocatalytic reaction mechanism for reducing Cr(VI) was investigated and found to follow the direct Z-scheme charge transfer pathway. This novel fabrication route for composite photocatalysts with tubular heterostructures could lead to the widespread implementations for the elimination of various harmful pollutants in the process of environmental governance.
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CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Yunxiao Ban,Zhijie Wan,Cong Ma,Yuzhen Wu,Haoran Chen
This study proposes a magnetic levitation fixed bed flocculation reactor as an effective method for the removal of Cr (VI). The research examines the effects of both single and dual polymer flocculants on the efficiency of the flocculation process. Initially, a magnetic levitation layer was established using a radial magnetic field in conjunction with stainless steel balls. Subsequently, polyaluminum chloride (PAC) and a non-ionic coagulant, polyacrylamide (NPAM), were introduced into the water to create a magnetic levitation fixed bed flocculation reactor. This reactor with the objective of purifying water contaminated with simulated Cr (VI). The results indicate that the incorporation of a reducing agent, specifically FeSO 4 , in conjunction with PAC and NPAM respectively, can achieve Cr (VI) removal rates exceeding 97% and turbidity removal rates exceeding 96%. The interaction between the cross-flow influent and the flocculating particles promotes the formation of micro-vortex flocculation.
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Advanced Sustainable Systems
·
2024
·Vol. 8
·期 10
·2400212
·
IF 6.5
Hanya Zhang,Pengkun Zhang,Zhengjie Su,Dong-Hau Kuo,Qinhan Wu,Ting Huang,Ping Li,Mengistu Tadesse Mosisa,Jinguo Lin,Xiaoyun Chen,Dongfang Lu
A novel La/O co-doped SnS oxysulfide catalyst (labeled SnLaOS) with heterovalent tin states and sulfur vacancy defects is successfully synthesized for effective catalytic reduction of toxic organics heavy metal ions with NaBH 4 in the dark. La/O co-doped and hydrogen peroxide-driven SnLaOS catalyst with suitable heterovalent Sn 2+ /Sn 4+ states and sulfur vacancy defects exhibited excellent catalytic reduction capability. The 100 mL 20 ppm of 4-nitrophenol (4-NP) and 50 ppm of rhodamine-B (RhB), methylene blue (MB), methyl orange (MO), and Cr(VI) solution are entirely reduced by 5 mg SnLaOS-3 within 10, 12, 12, 16, and 14 min, respectively, with durable stability. Synergistic transition metal La 3+ -cation and O 2− -anion co-doped SnS adjusted the energy bandgap and introduced sulfur vacancy defects, and the hydrogen peroxide-driven regulated the SnLaOS with suitable Sn 4+ /Sn 2+ states ratio. The sulfur vacancies in SnLaOS provide active sites for adsorbed proton for pollutants reduction, and heterovalent Sn 2+ /Sn 4+ states in SnLaOS facilitates electrons efficient transfer through electron hopping between Sn 2+ and Sn 4+ for pollutants reduction. This study provides a novel efficient catalyst for the water pollutants treatment.
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JOURNAL OF HAZARDOUS MATERIALS
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2022
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IF 14.224
Ying Yan,Yi Peng,Jing Wang,Ziyang Xiang,Yanmei Li,Junhui Yang,Jinglin Yin,Hongbo Xiao,Wenlei Wang
The reutilization of exhausted biochar is attracting extensive interest among researchers. In this study, the biochar generated from Chinese fir with natural regular porous structure that adsorbed Cd 2+ /Ni 2+ at different concentration levels was used as the precursor, and then combined with simple hydrothermal vulcanization and ion deposition to generate the p-n heterojunction between NiS and CdS compounds (NiS-CdS@C) in situ. The hybrids with 3 cycles of NiS deposition reduced the interfacial transmission resistance from 80 Ω to 40 Ω, and increased photocurrent density by 5 times, thus effectively promoting the separation of photogenerated electrons and holes. The simultaneous removal of As(III) and Cr(VI) was selected to evaluate the oxidation and reduction capacity of the visible light/NiS-CdS@C/oxalate system. The results indicated that 10 mg/L As(III) and Cr(VI) were completely and simultaneously removed with 0.75 mM oxalate addition within 40 min in the system, and the NiS-CdS@C presented good durability and stability for oxalate activation. Electron paramagnetic resonance (EPR) and quenching experiments demonstrated that oxalate was activated by holes under light to produce •CO 2 − and enhanced the generation of additional •OH and •O 2 − , further contributing to the oxidation of As(III) and reduction of Cr(VI).
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ANALYTICA CHIMICA ACTA
·
2025
·
IF 6
Shan Huang,Wenqian Zhang,Bo Li,Guixin Li,Wei Ni,Yi Fang,Fuxiang Wei,Qi Xiao
Background Hexavalent chromium ions (Cr(VI)), a notorious toxic heavy metal pollutant with proven carcinogenicity, endangers human health and the environment. Meanwhile, l -ascorbic acid (L-AA), a vital biological antioxidant, has abnormal levels closely tied to various diseases. Developing efficient synchronous detection methods for these two key analytes is of great value in clinical and environmental monitoring. Traditional fluorescent nanomaterials, particularly those emitting in the blue/green region, suffer from limited tissue penetration depth and autofluorescence interference, hindering their application in deep-tissue imaging and real-time monitoring. Therefore, the development of red-emitting nanomaterials with enhanced optical properties and multifunctionality is crucial for advancing biosensing and bioimaging technologies. Results Herein, we present a facile hydrothermal synthesis of manganese-doped carbon dots (Mn-CDs) that exhibit red fluorescence ( λ ex / λ em = 520 nm/675 nm) and exceptional sensitivity for the simultaneous detection of Cr(VI) ions and L-AA. Mn-CDs were synthesized using o -phenylenediamine (OPD) and 2,5-diaminobenzenesulfonic acid (DSA) as precursors, along with manganese chloride tetrahydrate as a metal dopant source, achieving a high fluorescence quantum yield of 11 %. The Mn-CDs function as a dual-responsive "off-on-off" fluorescent sensor, demonstrating low detection limits of 0.44 μM for Cr(VI) and 1.11 μM for L-AA. Utilizing smartphone-integrated RGB analysis, the detection limits were further improved to 0.021 μM for Cr(VI) and 0.06 μM for L-AA. The Mn-CDs exhibit excellent biocompatibility and low cytotoxicity, enabling successful application in HeLa cells imaging and real-time intracellular monitoring of Cr(VI) and L-AA. Significance This study introduces a novel Mn-CDs-based fluorescent-colorimetric dual-mode probe that overcomes the limitations of traditional blue/green-emitting CDs by offering enhanced tissue penetration, minimized background interference, and multifunctional integration for biosensing and bioimaging. The integration of Mn-CDs with a smartphone-based analytical platform enhances their portability and user-friendliness for on-site detection, providing a valuable tool for heavy metal pollution monitoring and clinical biomarker detection. This work not only broadens the application scope of metal-doped carbon dots in biosensing but also provides a new strategy for environmental monitoring and clinical diagnostics, demonstrating significant application prospects in advancing biomedical research and clinical practice.
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JOURNAL OF HAZARDOUS MATERIALS
·
2026
·
IF 11.3
Pingxiu Zeng,Zhenzhen Ma,Hongmei Hu,Meiying Ye,Yuanchao Wang,Heyong Cheng
Species-specific toxic, metabolic, and bioavailable properties of commonly coexisting metal(loid)s—particularly Cr, As, Cd, Hg, and Pb—necessitate their speciation analysis. Because of the complexity and diversity in chemical form, concentration (from picograms to milligrams per liter), interactions, and sample matrix, multi-elemental speciation methods are preferred over traditional mono-elemental speciation methods. However, current multi-elemental speciation methods have primarily associated with only two metal(loid)s. Herein, we developed an efficient, sensitive, inexpensive, and green methodology for the simultaneous penta-elemental speciation analysis of Cr, As, Cd, Hg, and Pb using high-performance liquid chromatography combined with inductively coupled plasma mass spectrometry and online solid-phase extraction (SPE) preconcentration. Food samples were extracted with a mixture of 0.1 M HNO 3 and 5 mM L -cysteine (Cys), chosen among 10 extractants for its good extraction efficiency, low noise, and minimal chromatographic interference. The proposed method offered a short analysis time (10 min for separation and 2 min for enrichment), excellent linearity (R 2 > 0.995), low detection limits (0.02 −0.12 μg L −1 in SPE-free mode; 0.02 −3.2 ng L −1 with online SPE), high precision (0.2 −2.4 %), and good recovery (81 −117 %) using an aqueous mobile phase of 5 mM tetrabutylammonium hydroxide + 5 mM Cys (pH 4.7). This demonstrates its good applicability to both food and water samples. Despite the incompatibility of Cr(VI) with As(III) and Cys, the proposed method excels in analytical, economic, and environmental aspects (maximizing the number of metal(loid)s within minimized analytical time using aqueous mobile phases), showing significant potential for a wide range of food, environmental, and biological samples.
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FOOD CONTROL
·
2022
·
IF 6.652
Dakai Guo,Qingwen Huang,Rui Zhao,Wenbo Guo,Kai Fan,Zheng Han,Zhihui Zhao,Dongxia Nie
An efficient and fast magnetic solid phase extraction (MSPE) method was developed using MIL-101(Cr)@Fe 3 O 4 nanocomposites as adsorbent for purification and enrichment of 9 mycotoxins in agricultural products. The successful synthesis of MIL-101(Cr)@Fe 3 O 4 was confirmed via various characterization methods. Several key parameters affecting the performance of the MSPE procedure were extensively investigated including loading solution, elution solution and dosage of adsorbents. Under the optimal sample pretreatment conditions, the complex matrix effects from different agricultural products could be efficiently eliminated and the calibration curves constructed in neat solvent were directly used for the accurate quantification of these mycotoxins. Coupled with the analysis by ultra-high-performance liquid chromatography-tandem mass spectrometry, good linearity (R 2 ≥ 0.991), high sensitivity (limit of quantification in the range of 0.08–0.20 μg kg −1 ), satisfactory recovery (83.5–108.5%) and acceptable precision (RSD, 1.6–10.4%) were obtained. The applicability of the validated method was further verified in real maize, wheat, watermelon and melon samples.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Yongxin Jiao,Shu Wang,Yupu Liu,Xin Li,Wenlong Yang,Shuang Han,Hui Zhang,Jiuxing Jiang
The artificial-photosynthetic semiconductor composites have attracted tremendous attention with respect to their enhanced photocatalytic properties. Herein, we reported the facile synthesis of Zn 0.5 Cd 0.5 S/WO 3 ·H 2 O S-scheme photocatalyst via one-pot in situ hydrothermal strategy. Density Functional Theory (DFT) calculation was employed to reveal the S-scheme photogenerated electron transfer mechanism, and the subsequent experimental characterization further illustrated the path for electron-hole transfer and separation under the effect of S-scheme heterojunction. The mass of WO 3 ·H 2 O accounted for Zn 0.5 Cd 0.5 S/WO 3 ·H 2 O 48 wt% (ZCSW48) was the best high-efficiency S-scheme photocatalyst displayed significant photocatalytic properties on pollution degradation, in detail, with the Cr (VI) photoreduction rate of 2.27 μmol·s −1 ·g −1 cat. and the Rhodamine B (RhB) photooxidation rate of 0.38 μmol·min −1 ·g −1 cat. , respectively. The designed Zn 0.5 Cd 0.5 S/WO 3 ·H 2 O photocatalysts have integrated with the three aspects of photocatalytic efficiencies including the visible light response, prolonged photogenerated carrier lifetime and the sufficient surface active sites due to amount of surface defects , therefore, this work provides more insights into the utilization of green energy for environmental treatment by artificial structured semiconductors.
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CHEMOSPHERE
·
2022
·
IF 8.943
Yixiao Wu,Xuesong Zhao,Yihao Li,Yu Ling,Yongqing Zhang,Xiaoqian Zhang,Shaobin Huang
The narrow light-response range and high electron/hole recombination rate greatly restrict the widespread use of photocatalytic technology . The integration of exposing dominant facet of semiconductor and Z-scheme heterostructures designing is expected to break those barriers. Herein，In this work, hydrothermal and ultrasonic stirring methods were used to selectively exposed the (001) and (110) facet of BiOI to construct the BiOI/CdS heterostructures. The obtained BiOI(001)/CdS material shown the maximum degradation for tetracycline-based antibiotics (Oxytetracycline, Tetracycline and Doxycycline), and excellent reduction of hexavalent chromium. Combining the electron spin resonance and scavenger experiments, the superior photocatalytic capacity was attributed to the generation of superoxide and hydroxyl radicals . DFT calculation results shown BiOI(001)/CdS performed high binding energy and adsorption energy for hexavalent chromium, and the different work function between BiOI(001) and CdS confirmed the building of internal electric field, thereby increased the charge separation. Finally, the Gaussian 09 and HPLC-MS program investigated the attack sites of free radicals and degradation pathways in the degradation of antibiotics. This study not only provides a potential photocatalyst, also gives an in-depth understanding of the photocatalytic properties of heterojunctions constructed by different exposed crystal facets.
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FOOD CHEMISTRY
·
2026
·
IF 10.4
Chunhua Li,Xieyang Zhang,Zihao Meng,Yafei Li,Zhonghong Li
Achieving the integration of detection and removal for Cu(II) and Cr(VI). • Cr(VI) is captured by amino groups of MDS and partially reduced to Cr(III). • Pyridine and amino of aerogel provided coordination sites to capture Cu(II). • Biocompatible aerogel has low cytotoxicity for L929 cells. • Detection and removal have no obvious effect on the quality of apple juice. Heavy metal pollution in food, particularly Cu(II) and Cr(VI), poses a significant threat to human health. A bifunctional composite aerogel (MDS) is successfully synthesized, immobilizing a 5,5′-diamino-2,2′-bipyridine (dabpy) post-modified MOF-808 within a sodium alginate (SA) aerogel for sensitive detection and efficient removal of heavy metal ions in apple juice. Mechanism studies reveal that pyridinic N and NH 2 in MDS display a high affinity for Cu(II), while Cr(VI) exhibits an electrostatic attraction to the protonated NH 2 . The interaction process triggers electron transfer, which leads to fluorescence quenching. MDS aerogel shows detection of Cu(II) and Cr(VI) with low limits of detection, and adsorption capacities of 354.91 mg/g for Cu(II) and 258.62 mg/g for Cr(VI). The MDS aerogel removal efficiency exceeded 94% in apple juice. In vitro cytotoxicity assays indicate low cytotoxicity of MDS. This work offers a potential bifunctional platform for heavy-metal sensing and removal in food matrices. Download: Download high-res image (135KB) Download: Download full-size image
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