INDUSTRIAL CROPS AND PRODUCTS
·
2022
·
IF 6.449
Limin Jing,Shuo Yang,Xia Li,Yifei Jiang,Jiang Lou,Zhuqing Liu,Qijun Ding,Wenjia Han
Although the treatment of heavy metal ions in environmental wastewater has attracted researchers' attention, it is still a great challenge to prepare green adsorbents with biodegradability, high adsorption efficiency, and high detection sensitivity. Herein, a bio-based, 3D network structured, luminescent aerogel with excellent adsorption efficiency and detection sensitivity for detecting and removing Cr 6+ in an aqueous solution was demonstrated. The bifunctional aerogels were designed and synthesized using waste collagen, polyethyleneimine (PEI), and carbon dots cross-linked by aldehyde cellulose nanofibers . Sorption experiments were designed to investigate the sorption properties of Cr 6+ through response surface methodology (RSM). The kinetic model (pseudo-second-order model) and isotherm model (Langmuir model) well-matched with the adsorption process . The maximum adsorption capacity by degradable collagen-based porous fluorescent aerogel for Cr 6+ reached 103.3 mg.g −1 . In addition, there was a good linear relationship between the fluorescence intensity of the fluorescent aerogel and the Cr 6+ concentration. In addition, the adsorption mechanism, fluorescence properties, microstructure, and surface morphology have been thoroughly studied. The proposed bifunctional aerogels could be attractive for smart sorbents in the field of removal and detection of metal ions in wastewater.
研究领域:
环境科学
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材料科学
·
生物学
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Guang Lu,Lunqiu Zhang,Jiling Liang,Wei Li,Zheng Li,Xuejun Zou,Xiaodong Zhang
Herein, first, MIL-125 samples were synthesized via a hydrothermal method. Then, Ag species were doping on the surface of MIL-125 samples via the photolysis of silver nitrate. Finally, the Z-scheme MIL-125/Ag/BiOBr composite was synthesized via a directed liquid assembly method. The structure, morphology, and optical properties of the prepared samples were investigated via X-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscopy, energy-dispersive X-ray spectroscopic mapping, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, N2 adsorption–desorption analysis, ultraviolet–visible spectroscopy, photoluminescence spectroscopy, surface photovoltage analysis, transient photocurrent response analysis, electrochemical impedance spectroscopy, and electron spin resonance analysis. Photocatalytic experiments indicated that the photocatalytic Cr6+ reduction efficiency of MIL-125/Ag/BiOBr heterojunctions was 85.7% at pH = 6, which was approximately 5.5 and 2.2 times higher than that using BiOBr and MIL-125 alone, respectively. This performance was attributed to the intimate interfacial contact between MIL-125 and BiOBr and the doping of Ag species, which increased the transfer and separation of photogenerated carriers and inhibited the recombination of electrons and holes. Furthermore, the possible photocatalytic Cr6+ reduction mechanism of the Z-scheme MIL-125/Ag/BiOBr photocatalyst was proposed.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2020
·Vol. 22
·期 11
·1-12
·
IF 2.132
Wang Linjuan,Zan Ling
MoS 2 -modified In 2 S 3 ( x wt.%MoS 2 -In 2 S 3 ) samples (0 ≤ x ≤ 20) were fabricated through a facile one-pot hydrothermal process. All In 2 S 3 samples modified by MoS 2 deliver an excellent Cr 6+ removal ability under visible-NIR-light-driven, and 5% MoS 2 -In 2 S 3 can reduce 20 mg/L Cr 6+ solution completely within 30 min with a trace photocatalyst concentration (0.27 mg/mL) which is 3.2-hold higher than that of single In 2 S 3 . Further investigations demonstrate that the loaded MoS 2 can not only enhance the absorption of light scope but also promote the interfacial electron transfer from In 2 S 3 to MoS 2 and then to Cr 6+ , thus greatly improving the Cr 6+ removal ability. ESR shows that the modifying of MoS 2 can accelerate the transformation of electrons from the In 2 S 3 to MoS 2 which results in that the intensity of O 2 − • significantly increased. PL, photocurrent, and EIS further identified that the modification of MoS 2 can greatly improve the charge carrier separation efficiency. The fabricated MoS 2 -In 2 S 3 samples also exhibit characteristic features such as stable and reducing Cr 6+ in the weak alkaline environment for the first time, which could always be a great challenge for wastewater purification in alkaline condition.
研究领域:
材料科学
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环境科学
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光催化技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Linjuan Wang,Siva Krishna Karuturi,Ling Zan
We present one-pot hydrothemal syntheis of SnS 2 -In 2 S 3 p-n heterostructures for photocatalytic reduction of Cr 6+ to Cr 3+ . The conduction bands of In 2 S 3 and SnS 2 serve as the photogenerated electron donors and acceptors, respectively, forming a p-n junction band alignment improving the photogenerated charge separation efficiency. Through a detailed investigation of photocurrent spectra, photoluminescence spectra and electrochemical impedance, the heterojunction formation is shown to enhance the photogenerated charge separation and transport properties. In addition, the analysis of 5,5-Dimethyl-1-pyrroline N-oxide (DMPO) spin trapping electron spin resonance (ESR) spectra and band structure further testify the p-n junction of the composite catalyst that could accelerate the electron transport and change the pathway of photocatalytic process toward Cr 6+ reduction. Furthermore, SnS 2 -In 2 S 3 heterojunction photocatalyst achieved 3 times and 67 times higher efficiency than pure In 2 S 3 and SnS 2 photocatalysts under visible light toward Cr 6+ reduction. Moreover, the SnS 2 -In 2 S 3 p-n heterojunction photocatalyst demonstrates Cr 6+ removal in a weak alkaline solution, breaking through the challenge of Cr 6+ reduction in an alkaline environment.
研究领域:
材料科学
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环境科学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Guangyang Wang,Shaobai Sang,Qinghu Wang,Yawei Li,Heng Wang,Tianbin Zhu
MgCr 2 O 4 is a potential infrared radiation material for high-temperature furnaces energy-saving. However, poisonous Cr 6+ is easily formed in MgCr 2 O 4 -based materials during the preparation process, which is harmful to the environment. In this study, TiO 2 -doped MgCr 2 O 4 materials were prepared at 1600 ℃ by solid-phase sintering method. The effects of TiO 2 as a dopant on the infrared radiation properties of MgCr 2 O 4 and the leaching concentration of Cr 6+ were investigated, and the mechanism was discussed. Results show that the emissivity of MgCr 2 O 4 in both near-infrared and mid-infrared bands is enhanced with the increase of TiO 2 content, and the specimen MgCr 1.6 Ti 0.4 O 4.2 has the highest average emissivity in the 0.8–2.5 μm and 2.5–10.0 μm bands, which are 0.82 and 0.87, respectively. Moreover, the addition of TiO 2 significantly reduces the Cr 6+ content of MgCr 2 O 4 , with the Cr 6+ removal rate of MgCr 1.6 Ti 0.4 O 4.2 up to 84.2 %.
研究领域:
材料科学
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能源工程
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环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
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2022
·
IF 3.841
Zhengjun Cheng,Yucong Fan,Lei Zhang,Chen Wang
A water-soluble, stable, simple, and dual ligands (bovine serum albumin and lysozyme) and Ag doping co-enhanced Au nanoclusters (Lys/BSA-Ag/AuNCs) was synthesized by one-step wet chemical synthesis. The introduction of Lys-and Ag could improve significantly the quantum yields of AuNCs (QYs, 2.54% to 12.73%). A new ratio fluorescent probe (RF-probe) was successfully obtained for sensitively and selectively mensurating 4-hexylresorcinol (4-HR) and Cr 6+ . That is, the fluorescence (FL) intensity of nanoclusters at 610 nm was used as the built-in reference, while dopamine (DA) reacting with 4-HR could produce a new fluorescent substance, and its FL intensities at 490 nm were enhanced gradually with increasing the concentrations of 4-HR. On the other hand, Cr 6+ will react with DA and consume the amount of DA reacting with 4-HR, resulting in the weakening of FL intensity at 490 nm, so the ratiometric fluorescence detection of Cr 6+ was also realized. The contents of 4-HR and Cr 6+ could be monitored by the RF-probe with linear ranges of 1.0–140.0 and 3.0–110.0 nM, and corresponding values of LOD (limit of detection) were calculated to be 0.16 and 0.37 nM (3σ/slope). Moreover, the proposed method was extended to the detections 4-HR and Cr 6+ in practical samples, and the results were consistent with those of the standard HPLC and UV–vis spectrophotometric methods. In addition, Lys/BSA-Ag/AuNCs exhibited an excellent temperature sensing performance in the range of 10.0–64.0 ℃.
研究领域:
分析化学
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环境科学
·
生物传感
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2023
·
IF 5
Shusheng Li,Xiaona Pan,Xiaoli Zhu,Xubao Jiang,Xiang Zheng Kong
Poly(urea-siloxane) (PUSi) microspheres are synthesized through step-growth and precipitation polymerization of isophorone diisocyanate (IPDI) and 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane (APDS) in a ternary solvent of acetonitrile/acetone/water (AN/AT/H2O). The chemical structure of the polymer is fully analyzed by nuclear magnetic resonance. Highly uniform PUSi microspheres are achieved with a monomer concentration of up to 20 wt % under optimized conditions, i.e., IPDI/APDS at 7.2/2.8 (mol) in the ternary solvent AN/AT/H2O at 65/20/15 (wt). Under UV lamp irradiation, these PUSi microspheres exhibit blue fluorescence, and the emission intensity is obviously enhanced with decreased IPDI/APDS ratio under excitation of 335 nm. In addition, PUSi microsphere dispersion in water shows concentration-enhanced emission. PUSi emission is ascribed to the flexible siloxane segments, which, combined with the urea groups on PUSi chains, make the polymer chains easy to form clusters through H-bonding, in accordance with the cluster-triggered emission. PUSi microsphere dispersion in water is used as a fluorescent probe for Cr6+ and Fe3+ detection, with high sensitivity and selectivity among fifteen competitive metal ions tested. More interesting and significant, a great feature of this probe is that, in contrast to the common fluorescent probes which are mostly disposable, it is reusable after quite easy separation of the microspheres from a previous testing, a high merit of this probe. Taking into account the easy preparation, the hazardous material free process, and the facile reusability, particularly, one can conclude that this work provides a simple, green, low-cost, and truly reusable fluorescent probe for Cr6+ and Fe3+ detection.
研究领域:
材料科学
·
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
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.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 54
·期 17
·11417-11434
·
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.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Jiangping Jing,Zhuoyuan Chen,Yuyu Bu,Mengmeng Sun,Wenqiang Zheng,Weibing Li
SrTiO 3 is a promising material for the photoelectrochemical (PEC) cathodic protection technology due to its intrinsic band structure . Its disadvantage of light absorption only in the ultraviolet region can be effectively solved by Cr doping. The Cr dopant usually exists as two states of Cr 3+ and Cr 6+ , among which the latter one usually behaves as the trapping center for the photoinduced electrons and leads to the decrease of the PEC performance. In this paper, a hydrogen treatment process is performed on the Cr-doped SrTiO 3 to reduce the Cr 6+ . It is verified that hydrogen treatment reduces Cr 6+ to Cr 3+ , leading to the increase of the concentration of the charge carriers and the decrease of the charge transfer resistance. And also, hydrogen treatment induces the formation of oxygen vacancy , which leads to the negative shift of conduction band potential and the increase of the concentration of the charge carriers. The effect of the hydrogen treatment temperature is further studied in this work. Higher temperature will promote the reduction degree of Cr 6+ and increase the concentration of oxygen vacancy . However, hydrogen treatment with excessively high temperature will induce too high concentration of oxygen vacancy, which would act as the recombination centers of the photogenerated charge carriers, suppress the mobility conduction and thus lead to the decrease of the PEC performance. Therefore, benefiting from the Cr 6+ reduction and modification with appropriate concentration of oxygen vacancy, the Cr-doped SrTiO 3 with hydrogen treatment at 250 °C shows the optimal PEC cathodic protection performance in NaCl solution.
研究领域:
材料科学
·
电化学
·
光电化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 41
·15656-15663
·
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.
研究领域:
环境科学
·
分析化学
·
纳米技术
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Mithun Nath,Shengqiang Song,Ning Liao,Tengteng Xu,Hang Liu,Himansu Sekhar Tripathi,Yawei Li
Obtaining a stable Cr 3+ phase at higher temperatures in the presence of hydraulic calcium aluminates (the phases found in calcium aluminate cement, CAC) in the Al 2 O 3 –CaO–Cr 2 O 3 system remains a significant challenge in many application areas, as the formation of toxic, carcinogenic, and water-soluble Cr 6+ compounds often occur. To address the issue, recently, we synthesized a high-temperature stable Cr 3+ ternary compound (CaAl 2 Cr 2 O 7 ) with space group P3 (143). In the present work, we investigated the formation-stability of CaAl 2 Cr 2 O 7 with in-situ calcium aluminate phases at 1500 °C under the CO 2 atmosphere in the Al 2 O 3 –CaO–Cr 2 O 3 system through solid-oxide reactions route varying Cr 2 O 3 content (at constant Al 2 O 3 :CaO ratio). It co-existed with hydraulic calcium aluminates and other phases over the full investigated composition range of 2.76–68.3 mol% Cr 2 O 3 (5–80 wt%). Apart from CAC phases (CaAl 2 O 4 , CaAl 4 O 7 ), major Cr 3+ -phases are CaAl 2 Cr 2 O 7 and (Al,Cr) 2 O 3 while (α,β)-CaCr 2 O 4 and Ca(Al,Cr) 12 O 19 formed as minor phases. At a constant Al 2 O 3 :CaO ratio of 5.6:4.4 mol% (7:3 wt%), the formation of the CaAl 2 Cr 2 O 7 phase increases with Cr 2 O 3 content (up to the investigated composition of 26.43 mol%) and then decreases gradually. The solid solubility of Al and Cr in the CaAl 2 Cr 2 O 7 phase limited over a narrow range, and presumably dependent more on heat treatment condition rather than composition as reflected from the lattice parameter calculations. Though XRD revealed the presence of only Cr 3+ -phases in the partial CO 2 atmosphere, however, traces of Cr 6+ could be detected using XPS and leaching tests. However, leachable Cr 6+ content (0.095–1.252 mg/L) were much below the United States Environmental Protection Agency (US-EPA) permissible limit of 5 mg/L. The formation mechanism of the CaAl 2 Cr 2 O 7 and other phases with plausible reactions were also discussed.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）