CHEMICAL GEOLOGY
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2017
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IF 3.347
Yingying Xie,Guining Lu,Han Ye,Chengfang Yang,Di Xia,Xiaoyun Yi,John Reinfelder,Zhi Dang
The cycling of Fe and Cr is intimately linked to the fate of schwertmannite in acid mine drainage (AMD) and acid sulfate soil (ASS) environments. Dissolved organic matter (DOM) can affect the stability of minerals and speciation, mobility and toxicity of heavy metals via redox reactions and complexation. However, knowledge about the fate of Fe and Cr upon reduction and complexation of CrO 4 2 − -substituted schwertmannite by fulvic acid (FA) is poorly understood. In this study, experiments were devised to investigate the interaction between FA and schwertmannite, with major degeneration of the schwertmannite structure as well as the formation of secondary minerals. For CrO 4 2 − -substituted schwertmannite, results indicated that the concentrations of total Fe and Cr in the solution were determined to be the maximum values at 360 h and 96 h, and then decreasing over the reaction time when FA was 10 mg/L at pH of 6.5. The characterization on the solid phase by X-ray diffraction, scanning electron microscopy and X-ray photo electron spectroscopy technologies revealed that goethite was the dominant newly secondary mineral phases which played a vital role in controlling the fate and transport of Fe and Cr. The possible mechanism was proposed to be synergistic effect including ligand-promoted and reduction. This study provides new insights into the understanding of trace element behavior in environments affected by DOM and also has guiding significance for Cr-contaminant remediation.
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MICROCHEMICAL JOURNAL
·
2026
·
IF 5.1
Shuo Wang,Pei Xiong,Hualan Xu,Shengqian Wang,Yuner Lin,Yiqian Cheng,Xuechun Wu,Huajiang Yu,Shengliang Zhong
The selective recognition of trace amounts of CrO₄ 2− and S₂O₄ 2− individually in aqueous solutions using a single metal-organic framework (MOF) platform has been scarcely explored. In this study, a ligand, 3,7-di(4-pyridyl) phenothiazine, was synthesized and employed to develop a zinc-based MOF (Zn-PTZpy) through a solvothermal process. The resulting Zn-PTZpy material exhibited strong luminescent characteristics. Acting as a dual fluorescent sensor for CrO₄ 2− and S₂O₄ 2− , Zn-PTZpy showed remarkable chemical stability and enabled highly selective detection of chromate ions (CrO₄ 2− ) through a fluorescence quenching process, exhibiting a high Stern-Volmer quenching constant ( K sv ) of 3.56 × 10 4 M −1 . In addition, when Zn-PTZpy interacted with dithionite (S₂O₄ 2− ) in aqueous solution, a pronounced fluorescence enhancement was observed, with an amplification constant ( K sv ) of 6.69 × 10 3 M −1 . The framework exhibited strong resistance to interference from other ions and achieved low detection limits of 0.09 μM for CrO₄ 2− and 0.12 μM for S₂O₄ 2− . Moreover, Zn-PTZpy demonstrated a rapid response, with detection times of 10 s for CrO₄ 2− and 3 min for S₂O₄ 2− . The Zn-PTZpy material exhibited remarkable effectiveness in real environmental and sample analyses, confirming its strong potential for practical applications. In addition, the Zn-PTZpy sensor achieved satisfactory recovery rates ranging from 93% to 111% when tested with spiked lake water samples. For the first time, this study presents the dual functional potential of Zn-PTZpy for applications in environmental monitoring.
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JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Xiangshan Hou,Jiayao Zhu,Jingwei Li,Yanhui Liu,Xujiang Wang,Wen Jiang,Wenlong Wang
Safe disposal of nuclear waste is an inevitable requirement for the rapid development of nuclear power. Sulfoaluminate cement (SAC) exhibits excellent performance and potential application in nuclear waste solidification. In this study, a temperature-variable leaching test (90 °C and 25 °C) and an ettringite crystal synthesis experiment were designed to analyze the influence of elevated temperature on SeO 4 2- and CrO 4 2- in SAC matrices. The results showed that, on the one hand, high temperature promoted the oxyanions leaching; on the other hand, it accelerated the early hydration of SAC and subsequently hindered further leaching. The decomposition of ettringite at high temperatures weakened both the physical and chemical solidification mechanisms. Changing from 90 °C condition to 25 °C condition could cause a small amount of ettringite to reform within pores, which significantly inhibited oxyanions leaching. No obvious competitive or induced effects between SeO 4 2- and CrO 4 2- were observed. In SAC matrices, the distributions of Se and S were integrated, whereas Cr tended to be enriched alone. SeO 4 2- tended to mix with SO 4 2- and participate in the formation of ettringite together, and CrO 4 2- tended to precipitate alone to form CrO 4 -ettringite. This paper presents new insights into the solidification and migration behavior of oxyanions when the solidification matrix undergoes phase transformations.
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PubMed
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CEMENT & CONCRETE COMPOSITES
·
2025
·
IF 13.1
Binglin Guo,Di Lu,Ping Ye,Kaixuan Wang,Yuxing Gao,Huyong Qin,Yang Liu,Tongsheng Zhang,Lei Wang,Chuanzhen Wang,Binggen Zhan,Qijun Yu
Cement-based solidification/stabilization (S/S) is widely used for the treatment of hazardous waste because it is a low-cost and straightforward process. However, the immobilization efficiency of traditional cement systems for amphoteric and anionic heavy metals is insufficient. Therefore, improving the immobilization ability of cement-based materials for amphoteric and anionic heavy metal pollutants is the key focus of current research. Herein, we innovatively increased the adsorption capacity of anions using quaternary ammonium group-functionalized modified biochar and systematically investigated the adsorption mechanism of modified biochar for Pb 2+ and CrO 4 2− under the alkaline conditions. Modified biochar was further incorporated into the cement matrix to evaluate its immobilization efficiency for Pb 2+ and CrO 4 2− and its effect on the properties of cement-based materials. Results showed that the substitution of quaternized biochar reduced the leaching concentrations of Pb 2+ and CrO 4 2− due to the positive charge of quaternized biochar under strong alkaline conditions, which reduced the electrostatic repulsion between anions and facilitated the adsorption of more heavy metal ions. Furthermore, due to the microfilling, internal curing, and hydration nucleation effects of biochar, biochar substitution improved the compressive strength of cement and the formation of hydration products. This study proposes a new strategy for preparing biochar–cement composite immobilization materials to address the bottleneck in cement-based S/S technology.
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Journal of Inorganic and Organometallic Polymers and Materials
·
2025
·
IF 4.9
Liu Deyan,Zhu Manying,Zhang Nanhai,Song Qinghe,He Guangjun,Wang Shixing,Zhang Libo
It is of urgent significance to develop highly stable and efficient CrO 4 2− detection technology in the fields of drinking water distribution and sewage treatment. A highly stable europium metal-organic framework (Eu-MOF) was designed as fluorescent probe for the efficient detection of trace CrO 4 2− in water solutions. This was achieved through the self-assembly of the lanthanide Eu 3+ and a rigid conjugated organic ligand [2,2’- biquinoline]-4,4’-dicarboxylic acid (H 2 L) under hydrothermal conditions. The obtained Eu-MOF exhibits excellent water stability, thermal stability and photostability. The Eu-MOF can quantitatively detect trace amounts of CrO 4 2− through fluorescence quenching effect. Its detection sensitivity is 4.48 × 10 4 M − 1 , with a detection limit as low as 0.06 µM (9.7 µg/L). This is one of the lowest values for the detection limit of CrO 4 2− in aqueous solution and is far below the allowable level for drinking water specified by World Health Organization. The Eu-MOF sensor also demonstrates excellent selectivity, anti-interference ability, repeatability (after 4 cycles), reproducibility and practical feasibility. Furthermore, the fluorescent luminescence and senseing mechanism were studied in detail. The fluorescence senseing mechanism of the Eu-MOF for CrO 4 2− detection involves the competitive absorption of excitation energy. The fluorescence-based sensing technology using the Eu-MOF provides a reference for environmental pollution detection and holds potential practical value.
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BIORESOURCE TECHNOLOGY
·
2020
·
IF 7.539
Huabin Wang,Siqi Wang,Zhulei Chen,Xinquan Zhou,Jia Wang,Zhuqi Chen
Cationic and anionic heavy metal contaminants generally co-exist in practical industrial effluent, and simultaneously removal of these species is a bottleneck for most of the bio-adsorbents because of their contrary charge. In this work, pinewood sawdust derived engineered biochar (BC) was fabricated with MgAl layered double hydroxide (MgAl-LDH) nanosheets, which could efficiently and simultaneously capture heavy metal cations and oxyanions from wastewater. The synergetic effect between loaded MgAl-LDH and BC substantially improves its adsorption performance towards both cationic and anionic contaminants, i.e., Pb 2+ and CrO 4 2− . The adsorption capacity of MgAl-LDH/BC for Pb 2+ reached 591.2 mg/g, which is 263% higher than that of BC, and in the case of CrO 4 2− , the adsorption capacity is 330.8 mg/g, 416% higher than that of BC. The elimination of Pb 2+ was mainly attributed to forming complexations with surface functional groups. While for oxyanions removal, CrO 4 2− can be reduced to Cr 3+ by functional groups, and then generated Cr 3+ could replace Al 3+ via morphic substitution, consequently formed an MgCr-LDH structure. Further, in the continuous fixed-bed column study, 225 bed volume of simulating electroplating wastewater co-existed with Pb 2+ and CrO 4 2− can be efficiently treated. Hence, this study sheds light on the engineered biochar design to efficiently and simultaneously capture heavy metal cations and oxyanions and its feasibility on real wastewater purification.
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INORGANICA CHIMICA ACTA
·
2022
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IF 3.118
Zong-Ying Li,Hong-Xia Zhang,Tian-Sheng He,Hong-Xin Jiang,Xiao-Wei Liu,Li-Na Zhu,Xiao-Zeng Li,De-Ming Kong
A two-dimensional (2D) water-stable Cd (II) luminescent coordination polymer ( 1 ), namely {[CdLCl 2 ]} n , was obtained through assembly of a new 2-deoxy- d -ribose derivative ligand (L) with CdCl 2 , 1 showed high stability in water. Further investigation showed that 1 can be used as luminescent probe for the organoarsenic compound Roxarsine (ROX) with high selectivity and sensitivity, high quenching constants (K SV = 2.34 × 10 4 M −1 ), low limits of detection (LOD) (0.16 μM) and good recyclability in aqueous media. In addition, this luminescent probe can detect some inorganic harmful ions (Fe 3+ , Cr 2 O 7 2− and CrO 4 2− ) with excellent versatility. The detection mechanism was proved that the quenching was caused by competitive absorption and resonance energy transfer effect between 1 and analytes. More strikingly, a simple 1 -based test strip was developed owing to the quick response and recyclability of 1 , which shows visible quenching signals under UV light even when analytes concentrations are as low as 5 μM. This work has provided an effective method for the design of multifunctional CP luminescent sensors for pollutants detections in aqueous media.
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CRYSTENGCOMM
·
2024
·Vol. 26
·期 24
·3167-3175
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IF 2.6
Meifang Liu,Yue Jiang,Huimin Du,Ziwei Zou,Mengtan Ye,Jingyu Chen,Hanying Ren,Jun Yang,Shanshan Hu
Chromium is a common heavy metal element that is harmful to the ecosystem as well as human health, so sensitive detection of chromium ions in solution is important for life and health. In this paper, a series of Eu3+-doped KBi3F10 fluorescent powders were successfully synthesized by a one-step solvothermal method for the selective detection of Cr3+, CrO42− and Cr2O72− ions in an aqueous solution. When adjusting the pH value to 3 and adding PVP as an additive, the obtained KBi3F10:12%Eu3+ phosphor showed excellent red luminescence. Due to the competitive absorption and the inner filter effect of Cr3+, CrO42− and Cr2O72− ions, the red emission from Eu3+ ions produces fluorescence quenching, which can be used to detect them with good selectivity. And the detection limits are as low as 0.19 μM, 0.38 μM and 0.094 μM for Cr3+, CrO42− and Cr2O72− ions, respectively. Other metal ions and common anions showed little interference with chromium ion detection. The obtained fluorescent probe has good recyclability, accurate and reliable detection results, simple operation and low cost and is easy to promote, which make it an excellent three-in-one probe for chromium detection.
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CRYSTENGCOMM
·
2021
·Vol. 24
·期 7
·1358-1367
·
IF 3.545
Yin-Xia Sun,Geng Guo,Wen-Min Ding,Wen-Yu Han,Juan Li,Zhe-Peng Deng
Heavy metal ions are common pollutants in water pollution. Amino acids, as important substances in organisms, participate in many life activities. The detection of heavy metal ions and amino acids with high selectivity and sensitivity is important. Therefore, based on H3L (H3L = 4,4′,4′′-triazine-2,4,6-tribenzoic acid) and Eu3+, an Eu-MOF was designed, synthesized and characterized. Single crystal structure analysis showed that the Eu-MOF was crystallized in the orthorhombic space group Fddd, and presents a three-dimensional (3D) porous network structure. The luminescence results show that the Eu-MOF has good luminescence stability. As a multifunctional luminescent sensor, the Eu-MOF can detect Fe3+, Cr2O72−, CrO42− and aspartic acid (Asp) in water systems with high sensitivity and selectivity, and the lowest detection limit (LOD) was 1.12 × 10−6 mol L−1, 1.95 × 10−6 mol L−1, 1.89 × 10−6 mol L−1 and 2.20 × 10−6 mol L−1, respectively. These results indicated that the Eu-MOF has potential application prospects in the detection of Fe3+, Cr2O72−, CrO42− and Asp in water.
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MATERIALS RESEARCH BULLETIN
·
2019
·
IF 3.355
Xiao Jiang,Qing-Da An,Zuo-Yi Xiao,Shang-Ru Zhai,Zhan Shi
Versatile adsorptive materials that can efficiently capture anionic and cationic heavy metals are extremely significant in purification of complex wastewater systems. Herein, a new type of amine modified, biopolymer-derived core/shell-like adsorbents were employed in heavy metal anion and cation adsorption. The maximum adsorption capacities for Cr(VI), Pb(II), and Cu(II) were measured to be 497.1, 535.6, and 163.7 mg/g, respectively. The adsorbent also showed great performance in heavy metal cation adsorption in fixed bed column experiments. Additionally, removal efficiency and rapid adsorption kinetics on low concentration heavy metal pollutions for both anion and cations were well discussed to demonstrate the potential in real accidental heavy metal pollution. The prepared core/shell-like biopolymer adsorbents were demonstrated to be a kind of versatile adsorbent for both anionic and cationic heavy metal ions in aqueous solutions.
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Analytical Methods
·
2025
·
IF 2.6
Nanhai Zhang,Deyan Liu,Rui Zhang,Qinghe Song,Guangjun He,Shixing Wang,Libo Zhang
The design and preparation of fluorescent sensors for detecting toxic ions in aqueous environments are of paramount importance. In this study, a europium metal–organic framework (Eu-MOF), constructed from Eu3+, the rigid 2,2′-biphenyldicarboxylic acid (2,2′-H2bpdc) ligand, and the auxiliary 1,10-phenanthroline (Phen) ligand, was synthesized through hydrothermal synthesis. The synthesized Eu-MOF demonstrated remarkable water stability, pH stability, thermal stability, and photostability. It showed a high quantum yield of 42.6%, along with an average fluorescence lifetime of 0.9002 ms, which could enhance its sensitivity when employed as a fluorescent probe. The Eu-MOF could function as a fluorescent probe to quantitatively detect trace amounts of Fe3+, CrO42− and Cr2O72− via fluorescence quenching. Their detection sensitivities are 1.527 × 104 M−1, 1.378 × 104 M−1 and 1.463 × 104 M−1 respectively, with detection limits as low as 0.28 μM, 0.19 μM and 0.09 μM. Additionally, the Eu-MOF sensor exhibited excellent selectivity, anti-interference ability, repeatability (after undergoing five cycles) and practical feasibility. Furthermore, a detailed investigation of its fluorescence properties and sensing mechanisms was carried out. Based on density functional theory calculations, two energy transfer pathways in the process of Eu3+ ion luminescence sensitized by the double ligands 2,2′-H2bpdc and Phen were identified. The fluorescence sensing mechanism of the Eu-MOF for detecting Fe3+, CrO42− and Cr2O72− involved photoinduced electron transfer from the antenna ligand to the organic molecules and competitive absorption of excitation energy. Owing to its high stability and sensitivity, the Eu-MOF holds great potential for practical applications as a sensor for Fe3+, CrO42− and Cr2O72− in aqueous environments.
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ANALYTICA CHIMICA ACTA
·
2020
·
IF 5.977
Yanqiu Zhang,Jiaxiang Liu,Xiaohan Wu,Wenquan Tao,Zhuo Li
Accurate, simple and quick detection methods for Cr(VI) detection are urgently needed for water quality monitoring. Herein, a novel and facile method of detecting Cr(VI) (Cr 2 O 7 2− /CrO 4 2− ) ions is developed via the fluorescent detection technology based on metal-organic frameworks (MOFs) doped with sulfur quantum dots (SQDs) (SQDs@UiO-66-NH 2 ). The blue-light-emitting SQDs@UiO-66-NH 2 composites exhibit excellent fluorescent properties in water environment with high quantum yield (68%) and ideal fluorescent stability, thus demonstrating excellent potential for serving as a chemical sensor. After characterizing the performance and stability of SQDs@UiO-66-NH 2 , qualitative and quantitative detection of Cr 2 O 7 2− and CrO 4 2− ions was successfully conducted. The fluorescence of SQDs@UiO-66-NH 2 composites in aqueous solution was quenched effectively with more than 90% quenching efficiency by Cr(VI) via the inner filter effect. The detection system provides considerable advantages such as rapid response (10 s), high sensitivity with a low detection limit of 0.16 μM in a broad linear range of 0–200 μM (R 2 = 0.99) for Cr 2 O 7 2− and 0.17 μM for CrO 4 2− in a broad linear range of 0–220 μM (R 2 = 0.99), high selectivity and reproducibility for at least five cycles with simple washing with alcohol. In practical applications, the sensor showed rapid response, high sensitivity and excellent recoveries (96.7%–105.4%) for detecting Cr 2 O 7 2− in real water samples. Furthermore, a SQDs@UiO-66-NH 2 -based fluorescent test paper was successfully developed, providing a simple, reliable and portable method for Cr(VI) (Cr 2 O 7 2− /CrO 4 2− ) detection in water environment.
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