MICROCHEMICAL JOURNAL
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2024
·
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.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
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.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Jiajia Yuan,Yue Luo,Xinfeng Zhang
In this study, we developed a sensitive chemiluminescence (CL) method for the detection of Cr (Ⅲ) and Cr (VI), based on periodate (NaIO 4 )-hydrogen peroxide (H 2 O 2 )-terbium-based metal–organic frameworks (Tb-BTC MOF) system. Reactive oxygen species (ROSs) created from the reaction of NaIO 4 with H 2 O 2 , such as singlet oxygen ( 1 O 2 ), can effectively transfer energy to the Tb-BTC MOF, resulting in the characteristic emissions from Tb 3+ through the antenna effect. Compared to its bulk form, the nanoscale Tb-BTC MOF exhibited significantly enhanced CL intensity, which can be attributed to improved surface properties and reduced non-radiative decay. The presence of Cr (VI) led to a marked decrease in CL intensity due to energy competition with the H 3 BTC ligand. Additionally, Cr (III) was oxidized to Cr (VI) by NaIO 4 , thereby indirectly contributing to CL quenching. A linear correlation was observed between the concentrations of Cr (III)/Cr (VI) and the reduction in CL intensity, enabling quantitative analysis of both species. Following systematic optimization, the proposed method demonstrated good sensitivity, achieving detection limits of 33 nM for Cr (III) and 17 nM for Cr (VI), which are significantly lower than those obtained with fluorescence-based detection using Tb-BTC MOF. Furthermore, by employing a cation-exchange resin for pre-separation, Cr (III) and Cr (VI) could be individually quantified within mixed samples. This method was also successfully applied to real water samples, yielding satisfactory recoveries and demonstrating its practical applicability for chromium speciation analysis in environmental matrices. Overall, this work provides new insights into the design of advanced CL systems using nanostructured MOFs, offering a promising strategy for the selective and sensitive detection of metal ions in complex environmental matrices.
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JOURNAL OF POROUS MATERIALS
·
2025
·
IF 3.2
Li Jionghui,Zhang Weiquan,Chen Qing,Xiong Chunhua
Polyacrylonitrile-2-aminopyridine (PAN-TAP) is a novel chelating fiber rapidly prepared by microwave-assisted synthesis method. The optimal synthesis conditions are microwave power of 800 W, reaction at 140 ℃ for 20 min. Fourier transform infrared spectroscopy (FT-IR) shows nucleophilic addition reaction between cyanide and 2-aminopyridine in PAN fibers. thermogravimetric analysis (TGA) shows that the synthesized material is stable within 200 ℃. Scanning electron microscopy (SEM) shows that synthetic materials have a larger diameter and a very rough surface compared to PAN fibers. The synthesized materials were also characterized by elemental analysis, energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Meanwhile, the adsorption characteristics and mechanism of PAN-TAP for Cr(Ⅵ) were evaluated. When the pH of the solution is 2, the adsorption capacity of Cr (Ⅵ) is the highest and it has good separation ability, with a maximum separation coefficient of β Cr/Ni = 357.75. The adsorption process conforms to the Langmuir isothermal adsorption model and the pseudo-second-order kinetic model, indicating that the adsorption mechanism is a chemisorption of monolayer adsorption. Cr(Ⅵ) is reduced to Cr(Ⅲ) by the amino groups on the fiber and then adsorbed. The maximum theoretical adsorption capacity is 287.1 mg/g (at 298 K), and the adsorption equilibrium can be reached within 1 h. The thermodynamic parameter Δ H > 20 kJ·mol − 1 indicates that adsorption is a spontaneous endothermic process. PAN-TAP fibers can be eluted with hydrochloric acid and reused. Overall, PAN-TAP is a cost-effective and rapid adsorbent, which has broad application prospects for the removal of Cr(Ⅵ) in water.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
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IF 3.131
Yujia Yan,Min Yang,Cunjin Wang,Enzhou Liu,Xiaoyun Hu,Jun Fan
Defect–rich zinc sulfide (ZnS, ZS) was successfully synthesized by the slow release of S source from glutathione (GSH) to coordinate with Zn 2+ at high temperature. Based on this, a novel ZnS/g–C 3 N 4 (ZSCN) heterojunction with high catalytic activity was fabricated through facile in–situ hydrothermal method . The removal rates of Rhodamine B (RhB), methyl orange (MO), methylene blue (MB) and Cr 6+ for ZSCN–0.05 with the highest catalytic activity under full–spectrum illumination were 13.0, 53.2, 2.0 and 11.6 times of g–C 3 N 4 (CN), and 3.6, 14.8, 1.2 and 3.9 times of ZS, respectively. While, under visible–light illumination, ZSCN–0.075 exhibited the best photodegradation performance for RhB, and the degradation rate was 5.2 and 19.3 times to CN and ZS, respectively. The enhanced photocatalytic activity of ZSCN heterojunction could be attributed to the synergistic effect between CN and ZS: ZS with defect-rich enhanced the absorption intensity of ZSCN in the ultraviolet, and CN broaden the spectral response range of ZSCN. Moreover photoluminescence spectrum confirmed that the formation of ZSCN heterojunction could effectively inhibit the recombination of photogenerated electrons and holes, and accelerate the electron transfer at its interface.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
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.
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PubMed
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Wenzhi Gu,Decong Zheng,Daping Li,Cuicui Wei,Xu Wang,Qingzhuoma Yang,Chang Tian,Mengyao Cui
In controlling toxic Cr(Ⅵ) pollution, the sulfate-reducing bacteria (SRB) method—a bioresource technology—is considered more sustainable and stable than synthetic technologies; however, its mechanisms of metal removal are unclear. This study investigated the mechanism of the use of citrate as a carbon source in an SRB bioreactor for Cr(Ⅵ) removal by disassemble or simulation approach. We show that citrate can mask toxicity, whereby the IC 50 value (inhibitory concentration affecting 50% of the test population) of citrate was higher than that of lactate, and that citrate can also protect water systems from oxidation. The anti-oxidation rate of citrate ranged from 76.00% to 90.92%; whereas for citrate‒Cr(Ⅲ), the oxidation rate was only 0.185%–0.587%. Citrate can up-regulate microbial genes and functions, causing acetate and sulfide (NaFeS 2 ) accumulation. Acetate addition promoted Cr adsorption by sulfide (mainly NaFeS 2 ) and promoted sulfide sedimentation. Moreover, in addition to Cr(Ⅵ) reduction and Cr(Ⅲ)‒sulfide generation, the addition of sulfide promoted sedimentation; the correlation coefficient between the sedimentation coefficient and the sulfur content was r = −0.88877 at p < 0.01. Therefore, citrate had a systemic radiative effect on every aspect of the SRB‒citrate system model for Cr(Ⅵ) removal. In addition to the reduction in the former simple model, an integrative effect (including adsorption, sedimentation, and metabolism) was combined with NaFeS 2 for Cr removal, which was regulated by the SRB‒citrate system. Exploration and understanding of these mechanisms promote SRB‒citrate methods to be wider implications in practice.
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INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Xiaojing Qin,Rongrong Tao,Song Cheng,Baolin Xing,Weibo Meng,Yanhe Nie,Chuanxiang Zhang,Jianglong Yu
ZnO based-double functional biochar (ZnO-BC) derived pine sawdust is prepared by microwave heating using simple one-pot method for levofloxacin (LEV) and Cr(Ⅵ) removal from wastewater. ZnO-BC has well developed pore structure with BET surface area of 915.47 m 2 /g, which also has well ZnO crystalline. These characteristics make ZnO-BC available as the adsorbent and photocatalyst for LEV and Cr(Ⅵ) removal wastewater. LEV and Cr(Ⅵ) adsorption date fit well with the Hill and Pseudo-second order equation with LEV and Cr(Ⅵ) adsorption amount of 193.42 and 21.03 mg/g, respectively. The LEV and Cr(Ⅵ) adsorption behavior are determined by the chemisorption process. The hydrogen bond, π-π interaction, surface complexation, pore filling are responsible for LEV removal. While the hydrogen bonding, complexation and redox are crucial to the removal of Cr(Ⅵ) from wastewater. LEV removal is 85.72–97.19% at 15–25 mg/L at 120 min, and Cr(Ⅵ) removal is 72.62–99.9% at 40–60 mg/L at 75 min under UV irradiation. The possible photocatalytic mechanisms of the LEV and Cr(Ⅵ) are further investigated and analyzed.
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OPTICAL MATERIALS
·
2025
·
IF 4.2
Wei Tan,Fengdi Fang,Xingbao Han,Lan Cheng,Pengli Zuo
As a new kind of fluorescent nanomaterial, carbon dots (CDs) have gained considerable focuses in regulating and improving their intrinsic properties. Some effective methods have been proposed and validated, like surface passivation and heteroatom doping in CDs. Herein, we have facilely fabricated the fluorescent nitrogen, silicon co-doped carbon dots (N,Si-CDs) by a one-pot solvothermal approach. N-[3-(Trimethoxysilyl)propyl]ethylenediamine and citrate were adopted as precursors for nitrogen, silicon, and carbon sources, respectively. Correspondingly, the formation of N,Si-CDs was affirmed via TEM, FT-IR, and XPS techniques. Further analysis of the optical properties was conducted using UV-vis spectrophotometry and fluorescence spectroscopy. Lastly, the prepared N,Si-CDs were utilized to investigate their sensing ability for rifampicin and Cr(Ⅵ) as well as photothermal effect. The detection linear range of this sensing probe for rifampicin was 0–18 μM, achieving the detection limit of 0.02 μM, besides the detection linear range for Cr(Ⅵ) was 0–130 μM, reaching the detection limit of 0.15 μM. Furthermore, the photothermal conversion efficiency (PCE) of N,Si-CDs was explored and calculated to be 43.45% with a favorable photothermal effect. Collectively, this research will provide novel insights for fluorescence sensing strategies and explore new proposals to develop CDs-based photothermal agents (PTAs) for cancer photothermal therapy (PTT).
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Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 6
·125013
·
IF 7.5
Wenjie Guo,Yinghua Lan,Wenbing Wu,Jien Niu,Yanmei Chen,Wenlong Xiang,Juan Xu,Yanhui Zhang
By combining the sol-gel method with the coprecipitation synthesis strategy, a series of cadmium sulfide-based catalysts (MTiO x -CdS, where M = Ce, Co, Cu, Zn) were successfully prepared. Under simulated sunlight irradiation, the material exhibited efficient and stable degradation performance for ciprofloxacin (CIP). Remarkably, by constructing a Cr(Ⅵ)-mediated redox system, a significant leap in degradation efficiency from nearly zero to 90% was achieved for bisphenol A (BPA) and ibuprofen (IBU). Studies reveal that Cr(Ⅵ) plays a dual role in this system, acting as both an "electron bridge" and an "adsorption anchor": on one hand, it serves as an electron acceptor to significantly inhibit charge carrier recombination; on the other hand, it enriches pollutants through coordination effects, thereby synergistically enhancing electron transfer and interfacial reactions. This work not only presents a cost-effective and efficient strategy for the synthesis of MTiO x -CdS photocatalysts but also offers valuable insights into the development of novel photocatalytic systems aimed at the remediation of complex water pollution and energy conversion applications.
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SOLID STATE SCIENCES
·
2023
·
IF 3.5
Yinghua Lan,Xuejing Wang,Yanmei Chen,Juan Xu,Yanhui Zhang
The synergistic effect of heavy metal ions and organic pollutants can enhance the photocatalytic performance and provides a new idea for environmental governance, so it has important research value. In this work, we prepared Pd–TiO 2 composites by ascorbic acid reduction method, and obtained the crystal structure, morphology and surface state information of the composites through a series of characterizations, which verified the successful preparation of the composites. It was used for simultaneous photocatalytic removal of bisphenol A (BPA) and Cr(Ⅵ), and it was found that the photocatalytic removal efficiency was significantly improved compared to their individual removal. This can be attributed to the synergistic effect between BPA and Cr(Ⅵ), where they enhance the separation efficiency of photogenerated electron-hole pairs and prolong the lifetime of photogenerated carriers. In addition, the effects of BPA concentration and Cr(Ⅵ) concentration on photocatalytic removal efficiency were also investigated. The mechanism of photocatalytic degradation of BPA by Cr(Ⅵ) coupling system was discussed by changing the experimental conditions, it is proved that the photocatalytic products of BPA can improve the removal efficiency of Cr(Ⅵ).
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TALANTA
·
2024
·
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).
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