MICROCHEMICAL JOURNAL
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2024
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IF 4.9
Zhichang Ma,Jing Sun,Hemeiling Cai,Junwei Di
A photoelectrochemical (PEC) sensor based on a BiVO 4 semiconductor and gold nanoparticles (AuNPs) was successfully prepared for the sensitive detection of Cr(Ⅵ) ions. The calcination temperature was found to be very important for the PEC properties of BiVO 4 . The BiVO 4 -modified indium tin oxide electrode (ITO/BiVO 4 ) calcined at 300 °C generated a low cathodic photocurrent response under light irradiation. BiVO 4 /AuNPs materials were coupled via electrostatic adsorption to enhance the photoelectric conversion performance of BiVO 4 . The use of self-assembled monolayers (SAMs) to modify electrodes reduce the background current. The developed ITO/BiVO 4 /AuNPs/L-Cys PEC sensor was used to detect of Cr(VI). The Cr(Ⅵ) ion concentrations showed a good linearity between 10 pM and 1 μM with a detection limit of 9.1 pM (S/N = 3). The prepared PEC sensor exhibited high sensitivity, a wide linear range, and good selectivity. This work provides a promising platform for the analytical detection of heavy metal ions.
研究领域:
环境科学
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分析化学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2019
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IF 4.175
Jingjing Xu,Chen Liu,Junfeng Niu,Yanlin Zhu,Biying Zang,Mengjuan Xie,Mindong Chen
LaFeO 3 /Bi 3 NbO 7 p-n heterojunction photocatalysts were prepared successfully through an in-situ growth method. The phase structure, optical property , morphology and microstructures of the obtained samples were studied by X-Ray diffractometer (XRD), Ultraviolet–visible absorption spectrum (UV–vis DRS), photoluminescence (PL) spectroscopy, transmission electron microscope (TEM), high resolution transmission electron microscope (HRTEM) and scanning electron microscope (SEM). The visible light responsive photocatalytic activity of as-obtained samples were investigated by the photo-reduction of Cr (Ⅵ). The effects of preparation conditions (proportion of BNO/LFO and temperature) on the activity were studied. Results showed that the as-obtained BNO-LFO-200-5 composite behaved the best photocatalytic activity (with rate constant of 0.0212 min −1 ) among all the obtained samples. The rate constant was about 42.4-times and 17.7-times as that of pristine BNO (0.0005 min −1 ) and LFO (0.0012 min −1 ), respectively. The enhanced photocatalytic property of the as-prepare LaFeO 3 /Bi 3 NbO 7 composites can be ascribed to the formation of p-n junction between BNO and LFO, which significantly increased the separation efficiency of photo-excited electron-holes.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Xin Gao,Baodong Li,Shouwei Jian
The fabrication of visible-light-driven heterostructured photocatalysts has been regarded as a promising strategy to enhance the photocatalytic performance. Here, a wet chemical method was adopted to prepare step-scheme CeO 2 /CaIn 2 S 4 (CCIS) composites. The CeO 2 nanoparticles were deposited on the surface of CaIn 2 S 4 (CIS) to form a tight interface, namely, heterojunction , which was confirmed by the multiple characterization methods. The formed heterojunction between CeO 2 and CIS was advantageous to promoting the charge carrier separation and migration. The photocatalytic performance of the resulted CCIS composites were evaluated by the Cr(Ⅵ) reduction under visible light irradiation. The optimized CCIS-10 sample exhibited the highest photocatalytic Cr(Ⅵ) reduction activity with the efficiency of 95% within 105 min. The enhanced photocatalytic activity of CCIS was attributed to the construction of step-scheme heterojunction system, leading to the efficient charge separation and high redox potential . The proposed mechanism for the enhanced photocatalytic performance was fully discussed and confirmed. This work may provide a simple strategy to rationally design efficient photocatalyst for Cr(Ⅵ) removal.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Fulin Wang,Helin Hua,Hui Jia,Dingying He,Zhongyou Jiang,Jiaxin Cao,Shanshan Dong,Zhenxing Zeng,Suhua Chen
The construction of heterojunction is considered to be an effective way to promote the photocatalytic activity, while it is always challenging due to the mismatched lattices of heterojunctional materials and results in an unsatisfactory enhancement of charge carrier separation. It is critical to overcome that lattice mismatch and establish charge transfer channels in heterojunction for achieving high charge transfer and separation. In this study, a red phosphorus/phosphorus doped graphitic carbon nitride (RP/P-CN) type I heterojunction was constructed to boost interfacial charge transfer for Cr(Ⅵ) photoreduction through in situ growing RP on g-C 3 N 4 nanosheets. The formed P − N bonds around interfaces in the RP/P-CN allowed photoexcited charge to rapidly transfer from the conduction band of P-CN to that of RP, which contributed to the significant achievement of Cr(Ⅵ) reduction. The constructed interfacial charge transfer channels largely promoted the photoexcited charge carrier separation in the RP/P-CN. Additionally, the simultaneous RP formation and P doping significantly enhanced the visible light response and the adsorption efficiency of Cr(Ⅵ). As a result, RP/P-CN 1:5 could achieve 99.1 % removal of Cr(Ⅵ) after 20-min visible light irradiation with an achieved apparent kinetic rate constant (k app ) of 0.2289 min −1 , which were much better than the 19.2 % of Cr(Ⅵ) removal by pure g-C 3 N 4 and presented a 21-fold higher k app than pure g-C 3 N 4 (0.0108 min −1 ) achieved, respectively. This study provides a new strategy to design an efficient g-C 3 N 4 based metal-free heterojunction for Cr(Ⅵ) photoreduction.
研究领域:
材料科学
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环境科学
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光催化
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Muhammad Usman,Adeel Ahmed,Bing Yu,Muhammad Rafiq,Zhijian Ji,Youqing Shen,Hailin Cong
Herein, we develop a versatile strategy for developing a Fe 3 O 4 -NH-β-CD-BP ILs based sorbent by installing synergistic bonding sites for simultaneous removal of per- and polyfluoroalkyl substances (PFASs) and heavy metals from contaminated water. This sorbent with its quaternary ammonium cation achieved remarkable removal efficiency (∼99 %)for both short and long chain anionic PFASs in pure water as compared to previous β-CD based materials. Moreover, when subjected to a challenging metal salt matrix, the adsorbents revealed that long-chain PFASs primarily relied on electrostatic and hydrophobic interactions, while short-chain PFASs depended solely on electrostatic attractions. The results indicate that the sorbent exhibits outstanding adsorption capacities for PFCAs, PFSAs and Cr (VI) coupled with fast adsorption kinetics featuring equilibrium times 5, 4 and 2 h, respectively. The simultaneous removal of PFOA, PFOS and Cr (VI) in multi-component systems (electroplating plant wastewater) was also determined due to their dual sites rendered by cationic and β-CD groups. The adsorption of PFCAs and Cr (VI) was significantly influenced by the initial pH compared to the sorption of PFSAs. Additionally, the viologen based sorbent also showed better photocatalytic hydrogen evolution activity. In summary, these results revealed the outstanding adsorption capacity and convenient regeneration process make the adsorbent as a promising candidate for efficient and rapid removal of PFASs from other pollutants.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2024
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IF 4.3
Jiaying Zeng,Ting Zhang,Geyu Liang,Jingwen Mo,Jianxiong Zhu,Longhui Qin,Xiaojun Liu,Zhonghua Ni
Hexavalent chromium (Cr(Ⅵ)) is a significant environmental pollutant because of its toxic and carcinogenic properties and wide use in various industries. Hence, there is an urgent need to develop accurate and selective approaches to detect the concentration of Cr(Ⅵ) in agricultural and aquaculture products to help humans avoid potential hazards of indirectly taking in Cr(Ⅵ). In this work, we report a “turn off–on” fluorescent sensor based on citric acid coated, 808 nm-excited core–shell upconversion nanoparticles (CA-UCNPs) and self-assembled copper porphyrin nanoparticles (nano CuTPyP) for sensitive and specific detection of Cr(Ⅵ). Nano copper 5, 10, 15, 20-tetra(4-pyridyl)-21H–23H- porphine obtained by acid-base neutralization micelle-confined self-assembly method function as an effective quencher due to its excellent optical property and water solubility. Through electrostatic interactions, positively charged nano CuTPyP are attracted to the surface of negatively charged CA-UCNPs, which can almost completely quench the fluorescence emission. In the presence of Cr(Ⅵ), nano CuTPyP can discriminatively interact with Cr(Ⅵ) and form nano CuTPyP/Cr(Ⅵ) complex, which separates nano CuTPyP from CA-UCNPs and restores the fluorescence. The sensing system exhibits a good linear response to Cr(Ⅵ) concentration in the range from 0.5 to 400 µM with a detection limit of 0.36 µM. The sensing method also displays high selectivity against other common ions including trivalent chromium and is applied to the analysis of Cr(Ⅵ) in actual rice and fish samples with satisfactory results.
研究领域:
环境科学
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分析化学
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纳米技术
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产品关联
DOI
PubMed
高影响因子
SOLID STATE SCIENCES
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2022
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IF 3.752
Xuejing Wang,Juan Xu,Sifan Liu,Wenwen Yang,Yanmei Chen,Yanhui Zhang
The research of metal organic frameworks materials of possessing semiconductor performance is important because they show great prospects on applications in wastewater treatment . In the current work, composites of TiO 2 / MOF-801(Zr) was prepared by a wet impregnation at room temperature , and a series of characterizations for catalysts, such as XRD , TEM , XPS, etc was investigated. The results of photocatalytic reduction of Cr(Ⅵ) under simulated solar light irradiation showed that 50%TiO 2 / MOF-801(Zr) exhibited better photocatalytic activity compared with other catalysts, which is attributed to synergistic effect including the interface enhancement effect and the enhancement of photogenerated carriers separation efficiency. The photocatalytic efficiency is as high as 98.1% when adjusting pH of reaction system to 1. It is most likely because the hydrogen cation concentration increased along with the increasing acidity, so that as to the promoting of reduction process of Cr(Ⅵ). In addition, we proposed a possible reaction mechanism of TiO 2 / MOF-801(Zr) composites for photocatalytic reduction of Cr(Ⅵ).
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
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2024
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IF 5.6
Jianshuo Miao,Quanling Zhao,Lijun Qian,Kehao Fan,Jialong Wen,Liuting Mo,Zhiyong Qin
Wastewater with chromium is a common heavy metal pollution in industrial pollution, affecting health of human seriously, while adsorption and photocatalysis are efficient for Cr(Ⅵ) removal. The multi-layer lignin core-shell structure materials were prepared with kraft lignin/polydopamine core-shell structure material, using non-covalent bonding to induce the in-situ induction of TiO 2 . The hydroxyl group of kraft lignin and the amino group of polydopamine provided abundant adsorption active sites with adsorption capacity being 299 mg/g at pH of 2. The adsorption process conformed to the Freundlich isotherm model and the pseudo-second-order kinetic model. The removal rate of Cr(Ⅵ) reached more than 99.9 % within 10 min under simulated solar light with influence of adsorption and photocatalysis. The multi-layer lignin core-shell structure materials presented excellent antibacterial activity, with the inhibition rate against S.aureus and E.coli being 40 % under dark conditions and 99 % under simulated solar light because h + or ·OH producing by TiO 2 . The antibacterial multi-layer lignin core-shell structure materials showed good universality in water pollution treatment.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Shujuan Zhang,Yanpeng Mao,Jian Sun,Tinglu Song,Zhanlong Song,Xiqiang Zhao,Wenlong Wang
In this research, N, Cl doped carbon quantum dots (CQDs) with triple-fluorescence centers was prepared by one-pot solvothermal method from waste traditional Chinese medicines as the raw material. The obtained N, Cl doped CQDs showed purple, yellow and red fluorescence under the 326, 380 and 578 nm excitation, respectively, of which red fluorescence was induced by the increase of concentrations and sensed rapidly water contents in 30–100% range with a limited of detection (LOD) of 0.65%. The obtained CQDs was applied for sensing Cr (Ⅵ) by triple channels, which exhibited the high selectivity and sensitivity for Cr (Ⅵ) with the LOD of 0.28, 0.87 and 0.90 μM, respectively. And its derivative materials exhibited the good linear range with 10–100 μM and 5–250 μM taking purple fluorescence as the response signal, respectively. The recoveries of N, Cl doped CQDs in tap water and sludge were in 93–110% range, suggesting a feasible avenue for accurate and rapid sensing of Cr (Ⅵ).
研究领域:
材料科学
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环境科学
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分析化学
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产品关联
DOI
高影响因子
ULTRASONICS SONOCHEMISTRY
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2023
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IF 8.4
Deming Zhao,Yiting Liu,Chunxin Wu
The research on developing a purification technology for Cr(Ⅵ) polluted water with high efficiency and the low energy consumption is crucial for achieving several Sustainable Development Goals (SDGs). In order to achieve these goals, Fe 3 O 4 @SiO 2 -APTMS nanocomposites were prepared by Fe 3 O 4 nanoparticles modified with silica and 3-aminopropyltrimethoxysilane in the presence of ultrasonic irradiation. The nanocomposites were characterized by TEM, FT-IR, VSM, TGA, BET, XRD, XPS and these analytic results proved that the nanocomposites were successfully prepared. The influential factors of Fe 3 O 4 @SiO 2 -APTMS on Cr(Ⅵ) adsorption have been explored and better experimental conditions have been obtained. The adsorption isotherm conformed to the Freundlich model. Pseudo-second-order kinetic model provided a better correlation for the experimental data compared to other kinetic models. Thermodynamic parameters for adsorption indicated that the adsorption of Cr(Ⅵ) was a spontaneous process. It was speculated that the adsorption mechanism of this adsorbent includes redox, electrostatic adsorption and physical adsorption. In summary, the Fe 3 O 4 @SiO 2 -APTMS nanocomposites were of great significance to human health and the remediation of heavy ion pollution, contributing to achievement of the Sustainable Development Goals (SDGs), including SDG-3, SDG-6.
研究领域:
环境科学
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材料科学
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可持续发展研究
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF CATALYSIS
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2024
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IF 6.5
Tianrui Xu,Guanghui Wang,Zehua Liu,Nansheng Deng,Xuewen Zhang
A green, efficient and recyclable magnetic BiFeO 3 /Cl-g-C 3 N 4 photocatalyst was prepared for the simultaneous removal of Cr(Ⅵ) and tetracycline (TC) from water by wet chemical and thermal synthesis methods. Experimental results revealed that BiFeO 3 /Cl-g-C 3 N 4 achieved a removal efficiency of 96.1 % for Cr(Ⅵ) and 98.2 % for TC under visible light irradiation for 50 min at pH 6. The results of the work function, charge density difference, UV–vis DRS, PL, PC and EIS tests indicate the formation of S-scheme heterojunctions between BiFeO 3 and Cl-g-C 3 N 4 , which exhibits superior carrier separation and migration efficiency. The evidence for interfacial charge transfer from BiFeO 3 to Cl-g-C 3 N 4 within BiFeO 3 /Cl-g-C 3 N 4 was further corroborated by means of ISIXPS, EPR and KPFM. Moreover, calculations of the density of states demonstrate that the introduction of Cl enhances the reduction capability of BiFeO 3 /Cl-g-C 3 N 4 . Results from ESR tests and trapping experiments has demonstrated that the singlet oxygen ( 1 O 2 ) and electrons are the primary active species. Furthermore, the high removal rates of TC and Cr(VI) from industrial wastewater and groundwater, coupled with the lower ecotoxicity of TC degradation intermediates, indicate that BiFeO 3 /Cl-g-C 3 N 4 has the potential for practical applications. After five cycles, the BiFeO 3 /Cl-g-C 3 N 4 still removed 90.5 % of TC and 96 % of Cr(Ⅵ).
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
TALANTA
·
2024
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IF 5.6
Shengyuan Zhang,Haiyan Li,Dezhi Yang,Yaling Yang
In the present research, Fe-based metal-organic frameworks (MIL-101(Fe)–NH 2 ) nanoparticles were synthesized by simple solvothermal methods and used to assay Cr(Ⅵ). The MIL-101(Fe)–NH 2 performs dual functions: the 2-aminoterephthalic acid (NH 2 -BDC) ligand endows a strong fluorescence emission, and the Fe metal nodes are able to facilitate the oxidation of 3,3′,5,5′- tetramethylbenzidine (TMB) directly, resulting in the generation of oxidized-TMB (ox-TMB). Our research results showed that reducing agents such as ascorbic acid (AA) can collapse the structures of MIL-101(Fe)–NH 2 because of the reduction of Fe 3+ by AA, resulting in release of NH 2 -BDC. In the presence of Cr(Ⅵ), the fluorescence intensity of the MIL-101(Fe)–NH 2 + AA system will be decreased due to the competitive reduction of Fe 3+ and Cr(Ⅵ). Nevertheless, Cr(Ⅵ) can significantly accelerate the oxidation of TMB by MIL-101(Fe)–NH 2 as it boosts the electron transfer rate between Fe 3+ and Fe 2+ . Therefore, a fluorescent/colorimetric dual-mode platform was developed for the detection of Cr(Ⅵ) with an extensive linear range (7.5–750 μg/L and 13.3–1000 μg/L) as well as a remarkably low detection limit (0.99 μg/L and 1.98 μg/L). This MOF with the ability to release ligands not only provides inspiration for the design of new luminescent materials, but also offers a novel and reliable solution for the detection of Cr(Ⅵ).
研究领域:
分析化学
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环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）