Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 41
·15656-15663
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IF 8.067
Guangchun Song,Qi Zhang,Shuang Liang,Ying Yao,Menglin Feng,Zainabu Majid,Xiaoyun He,Kunlun Huang,Jin-Cheng Li,Nan Cheng
The rapid, efficient, and low-cost detection of heavy metal ions using sensors has attracted widespread interest from researchers due to the health risks posed by heavy metal pollution. In recent years, single atom nanozymes with uniformly dispersed active centers and precisely designed coordination structures have been developed and used for the rational construction of various sensors. However, there is a lack of technology available to detect heavy metal ions using the catalytic activity of nanozymes. In this study, we investigated the oxidase-like (OXD-like) catalytic activity of the single atom Ce-N-C (SACe-N-C) prepared in our previous studies. Notably, we found that both Fe3+ and Cr6+ could significantly enhance the electron conversion rates of Ce3+ and Ce4+ within the SACe-N-C nanozyme, which contributed to the OXD-like activity of the nanozyme. Therefore, we constructed a time-resolved sensor to detect Fe3+ and Cr6+ using the oxidative activity of the SACe-N-C nanozyme. The LOD for Fe3+ was 34.72 ng mL−1 in the linear range of 0.25–1.5 μg mL−1, and the recoveries were in the range of 88.66–113.24%. The LOD for Cr6+ was 93.65 ng mL−1 in the linear range of 0.5–5 μg mL−1, and the recoveries were in the range of 85.49–111.22%. The sensor could rapidly detect Fe3+ and Cr6+ at 30 s and 60 s, respectively. This study provides a promising time-resolved strategy for the rapid detection of Fe3+ and Cr6+ in food using the OXD-like catalytic properties of the SACe-N-C nanozyme.
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ANALYTICA CHIMICA ACTA
·
2020
·
IF 5.977
Shasha Liu,Xianfeng Wang,Chengyue Zou,Jun Zhou,Mei Yang,Suyi Zhang,Danqun Huo,Changjun Hou
Hexavalent chromium ion (Cr 6+ ) is highly toxic to human health and environment. Herein, high-performance detection of Cr 6+ is of great import. In this study, a rapid and sensitive multicolor colorimetric method for detection of Cr 6+ in aqueous solution was established on the basis of Cr 6+ etching of gold nano-double cone@silver nanorods (Au NDC@Ag NRs). Au NDC@Ag NRs was synthesized by a modified seed-mediated growth method. The catalytic etching induced by Cr 6+ changed the morphology of Au NDC@Ag NRs, leading to the attenuation of surface plasma resonance (SPR) and the redshift of absorption spectra . Meanwhile, Au NDC@Ag NRs exhibits obvious color changes from orange to pink, to purple, and finally becomes colorless with the increasing concentrations of Cr 6+ . With such a design, naked-eye detection of Cr 6+ was realized with high sensitivity. The proposed multicolor sensing method showed a good linearity between the redshift change of absorption peak (△λ) and the concentrations of Cr 6+ in the range from 2.5 to 40 μM. The limit of detection (LOD) was calculated as 1.69 μM in aqueous solution. In addition, successful detection of Cr 6+ in tap water and Yangtze River water, indicating the real applications of Au NDC@Ag NRs probe in monitoring Cr 6+ in environment.
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MATERIALS RESEARCH BULLETIN
·
2021
·
IF 4.641
Zhipeng Cheng,Qian Dong,Shu Chen,Wei Zhao,Xiaozhong Chu,Hui Zhong,Pusu Zhao,Lili Zhang,Jiming Xu,Xujing Guo,Feng Liang,Fengling Yang
Novel AgCl x Br 1−x solid solutions were synthesized through a simple low-temperature hydrothermal approach, avoiding the high-temperature agglomeration of nanoparticles . The AgCl x Br 1−x solid solutions are homogeneous crystal structures rather than common heterojunction materials. The AgCl x Br 1−x are provided with tunable bandgaps from 2.99 eV to 2.49 eV by improving the Br/Cl mol ratios. The AgCl 0.3 Br 0.7 sample exhibits the most efficient catalytic activities for the reduction of Cr 6+ and oxidation of Bisphenol A (BPA) under simulated sunlight irradiation, and the apparent quantum efficiency (QE) for the removal of Cr 6+ can achieve 42.8 %, which is 10.7 time higher than that of the AgCl (QE = 4.0 %) sample. As for the catalytic oxidation of BPA, 66.8 % of TOC is removed from the reaction system after 100 min reaction. The highest efficiency of the AgCl 0.3 Br 0.7 sample can be rationally ascribed to the comprehensive factors, especially the narrowed bandgap, enhanced surface areas, and suppressed the photo-generated carriers’ recombination.
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Journal of Water Process Engineering
·
2026
·
IF 6.6
Zhaohui Zhang,Zeyu Zhang,Jiaxiang Liu
Hexavalent chromium (Cr 6+ ) is a highly toxic heavy metal ion pollutant that poses serious a threat to human health. In this work, iron hydroxide (Fe(OH) 3 ) derived from steel slag (SS) was used as the raw material, carboxymethyl cellulose (CMC) as the skeleton, and carbon quantum dots (CDs) as the fluorescent probe to successfully prepare a composite material with Cr 6+ adsorption and fluorescence detection properties (Fe(OH) 3 @CMC-CDs). The Fe(OH) 3 @CMC-CDs exhibited a specific surface area of 112.52 m 2 /g and a three-dimensional porous architecture, with Fe(OH) 3 uniformly distributed within the cellulose network. The adsorption results showed that adsorption behavior of Cr 6+ on Fe(OH) 3 @CMC-CDs followed the pseudo-second-order kinetic model and Langmuir model, with a maximum adsorption capacity of 214.13 mg/g at 333 K. In addition, Fe(OH) 3 @CMC-CDs showed sensitive fluorescence detection performance for Cr 6+ , and the detection limit was 7.21 × 10 −5 mol/L. Reusability experiment demonstrated that Fe(OH) 3 @CMC-CDs had excellent recyclability for Cr 6+ , after 5 adsorption-desorption cycles, the removal efficiency for Cr 6+ above 87%. This study introduces an innovative approach to preparing a dual-functional composite material with both adsorption and detection properties using Fe(OH) 3 derived from steel slag. It achieves the resource recovery and value-added utilization of steel slag, and provides new insights into the removal of Cr 6+ and the design of multifunctional adsorbent.
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2020
·
IF 3.442
Linjuan Wang,Ling Zan
Industrial wastewater containing heavy metal ions can cover the full pH range according to the manufacturing process. Alkaline wastewater treatment is still a great challenge because Cr 6+ therein has a more negative reduction potential (Cr 2 O 7 2− + 14H + + 6e − = 2Cr 3+ + 7H 2 O (E Cr 6+ (Cr2O7 2− /Cr 3+ ) = E θ − RT nF ln [ OH ] − ) than in acid solution, in which it can be easily reduced by numerous reagents. In this study, weakly alkaline Cr 6+ solution has been used to simulate weakly alkaline industrial wastewater, and a reagent capable of excellent reduction efficiency therein has been developed. A series of band-gap-energy-adjustable NiS-Zn x Cd 1- x S composites has been synthesized by a one-pot hydrothermal method . A more negative conduction band position for Zn x Cd 1- x S has been achieved by doping and changing the amount of Zn 2+ ions to ensure a superior photoreduction ability. All modified samples show excellent photocatalytic efficiency. For example, the reduction efficiency of 10%NiS–Zn 0.25 Cd 0.75 S sample is threefold higher than that of Zn 0.25 Cd 0.75 S and sixfold higher than that of CdS when deployed at a catalytic level for 30 min. Multiple characterization methods have been applied, and the results show that the improved efficiency can be ascribed to intimate contact between Zn 0.25 Cd 0.75 S and NiS. Photoluminescence (PL) and photocurrent measurements and electrochemical impedance spectroscopy (EIS) further elucidate the catalytic mechanism and imply an enhanced charge-carrier separation efficiency between Zn 0.25 Cd 0.75 S and NiS.
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JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 54
·期 17
·11417-11434
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IF 3.442
Wang Dadao,Li Jian,Xu Zhifeng,Zhu Yeran,Chen Guoxin,Cui Zheng
A novel three-dimensional ball-flower-like g-C 3 N 4 /NiO (GN) photocatalyst was firstly fabricated by a simple two-step calcination method for enhanced degradation capability. Our investigation focuses on the construction of p–n heterojunction and specific ball-flower-like structure to overcome limitations of single-component semiconductors, such as low surface area, poor light response and fast recombination of the photogenerated electrons and holes. Detailed photocatalytic experiments revealed that the novel ball-flower-like GN (50%) exhibited much higher activity for the removal of TC and Cr 6+ than single g-C 3 N 4 , NiO and traditional layered GN. The trapping experiments proved that the superoxide radicals ( \( ^{ \cdot } {\text{O}}_{2}^{ - } \) ), holes (h + ) and electrons (e − )were the main active species in the photodegradation process. Moreover, three different degradation pathways and fourteen intermediate products of TC were also determined by the LC/MS analysis and these intermediates could be further degraded completely into CO 2 , H 2 O, \( {\text{NH}}_{4}^{ + } \) , carboxylic acids and any other inorganic intermediates. These results will benefit the fabrication of other 3D p–n heterojunction photocatalysts and their potential application in treatment of organic pollutants.
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Advanced Sustainable Systems
·
2024
·Vol. 8
·期 12
·2400429
·
IF 6.5
Baoqian Yang,Xinru Wu,Zhengjie Su,Benjamin Kunkadma Insua,Pengkun Zhang,Dong-Hau Kuo,Lulu Gao,Xinde Bao,Dongfang Lu,Jinguo Lin,Xiaoyun Chen
V/S co-doped SnO 2 bimetal sulfur-oxides catalysts labeled as (Sn,V) 1- x (S,O) 2- y or (SnVSO) with heterovalent state and oxygen vacancy defect are prepared via a green and facile method. The presence of SnVSO in the heterovalent states of Sn 4+ /Sn 2+ and V 5+ /V 4+ facilitates the rapid transfer of the electrons. It improves the electronic charge lifetime, accelerating the efficiency of the catalytic reduction of pollutants. The V/S co-doped SnO 2 regulates the bandgap energy structure. The hydrazine adjusts the heterovalent metal states to reduce Sn 4+ to Sn 2+ and V 5+ to V 4+ . Also, it introduces oxygen vacancies to SnVSO to maintain the charge equilibrium and increase the active surface reactive sites, which enhance the catalytic activity. The SnVSO-3 prepared with 0.4 mL hydrazine exhibits excellent catalytic activity, which wholly reduces 20 ppm of 100 mL methyl orange (MO), rhodamine B (RhB), methylene blue (MB), hexavalent chromium (Cr 6+ ), and 4-nitrophenol (4-NP) within 6 min. In addition, the SnVSO-3 also has good stability after repeated 6 runs with a reduction efficiency of 96.8%. Therefore, the V/S co-doped SnO 2 sulfur oxide catalysts have a promising potential for reducing Cr 6+ and organic pollutants.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2018
·
IF 4.61
Zeng-Hui Diao,Jian-Jun Du,Dan Jiang,Ling-Jun Kong,Wen-Yi Huo,Cui-Mei Liu,Qi-Hang Wu,Xiang-Rong Xu
Cr 6+ and Pb 2+ are both highly toxic pollutants and commonly co-exist in some industrial effluents and contaminated waters . In this study, simultaneous removal of Cr 6+ and Pb 2+ by a novel sewage sludge-derived biochar immobilized nanoscale zero-valent iron (SSB-nZVI) was systematically investigated. It was well demonstrated that a porous structure was successfully formed on the SSB-nZVI when the starch was used as an additive. A synergistic effect on the adsorption and reduction over the SSB-nZVI was achieved, resulting in nearly 90 and 82% of Cr 6+ and Pb 2+ removal within 30 min, respectively. Cr 6+ was reduced prior to Pb 2+ . A low pH could accelerate the corrosion of nZVI as well as phosphate leaching. When Malachite green was added as a coexisting organic pollutant, its effective removal was found due to the formation of a Fenton-like system. The SSB-nZVI could be run consecutively three times with a relatively satisfactory performance. Most of Cr 6+ was converted into Cr 2 O 3 and Cr(OH) 3 on the SSB-nZVI surface, whereas most of Pb 2+ species existed as Pb(OH) 2 (or PbO). A possible reaction mechanism on the SSB-nZVI involved the adsorption, reduction and precipitation of both Cr 6+ and Pb 2+ over the particles. Present study sheds light on the insight of the fate and transport of Cr 6+ and Pb 2+ in aquatic environment, as well provides helpful guide for the remediation of coexistence of pollutants in real applications.
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FOOD CHEMISTRY
·
2019
·
IF 5.399
Jiaojiao Yin,Li Wang,Yuanyuan Chen,Dianfu Zhang,Abeer M. Hegazy,Xuezhen Zhang
In this study, bighead carp ( Aristichthys nobilis ) were exposed to waterborne Cr 6+ of 0.01, 0.1, 1 and 5 mg/L for 14 days and subsequently transferred to clean water for another 14 days. The Cr 6+ contents in some edible parts, such as dorsal muscle, ventral muscle and head were detected. The Cr 6+ concentrations in the three parts were in the order of: head > ventral muscle > dorsal muscle with significant increase during exposure period and remarkable decrease when kept at clean water during depuration stage. The head contained higher fat than that of muscle and the Cr 6+ levels of these parts showed significantly positive correlation with fat content, however, the Cr 6+ contents in the separated fat were extremely low. The Cr 6+ levels determined in tissues can tell a real story rather than the correlation coefficient. Fish head poses a higher potential health risk than muscle due to heavy metals pollution.
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