MICROCHEMICAL JOURNAL
·
2019
·
IF 3.206
Junling Duan,Li Zhao,Wei Lv,YiJing Li,Yuanhong Zhang,Shiyun Ai,Lusheng Zhu
The g-C 3 N 4 /Fe 3 O 4 nanocomposites with good fluorescence and magnetic property were designed and prepared for simultaneous detection and separation of trace Cr(VI) in water. The g-C 3 N 4 /Fe 3 O 4 nanocomposites based fluorescent sensor for Cr(VI) showed high sensitivity and selectivity. The linear response range of Cr(VI) was found to be 0 to 600 μM with a detection limit of 0.5 μM. In addition, the g-C 3 N 4 /Fe 3 O 4 as a novel adsorbent had effective removal towards Cr(VI). The adsorption capacity could reach 59.2 mg/ g. Furthermore, the g-C 3 N 4 /Fe 3 O 4 nanocomposites displayed superparamagnetic properties, allowing them to be easily separated from the liquid phase via an external magnetic field .
研究领域:
环境化学
·
分析化学
·
纳米材料学
·
环境污染与控制
·
水处理技术
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Yandi Li,Bo Wang,Shuangjiang Li,Zhiyong Xu,Wenbo Zhao
A series of MCl 2 @MIL-101(Cr) composites were fabricated via vacuum wet impregnation. • CaCl 2 @MIL-101(Cr)-0.35 exhibits ultrahigh NH 3 uptake of 28.9 mmol/g at 298 K and 100 kPa. • Composite shows excellent NH 3 /N 2 selectivity and cycling stability. • Adsorption rate is extremely fast and follows pseudo-second-order kinetic. • Synergistic effect between chemical and physical adsorption was proved. Ammonia (NH 3 ) is a vital chemical raw material and promising carbon-free energy carrier, its efficient capture is essential for both industrial production and energy development. However, achieving high capacity, high selectivity and high stability in NH 3 capture adsorbents still remains a challenge. Herein, a series of metal chloride@MIL-101(Cr) composite adsorbents (M = Ca, Co, Ni) were fabricated via a vacuum wet impregnation method. Structural characterization confirmed that metal chlorides were highly dispersed within the MIL-101(Cr) pores as an amorphous phase without damaging the MOF framework. The optimal CaCl 2 @MIL-101(Cr)-0.35 achieved an ultrahigh NH 3 adsorption capacity of 28.9 mmol/g at 298 K and 100 kPa, which is 3.6 times that of pure MIL-101(Cr). The extremely high NH 3 adsorption capacity is attributed to strong coordination bonds between Ca 2+ and NH 3 , and synergistically enhanced by N–H···Cl − and N–H···O hydrogen bonds involving the Cl − as well as the framework carboxylate oxygen atoms, respectively. It also demonstrated estimated high NH 3 /N 2 selectivity (>6000 at low pressure) and good short-term cycling stability, retaining over 95% of its initial capacity after 10 adsorption-desorption cycles. The adsorption kinetics were rapid, and the process was best described by the pseudo-second-order model, indicating a chemisorption-dominated mechanism. This “confinement loading” strategy effectively combines the physisorption advantages of MOFs host and chemisorption merits of metal chlorides guests, achieving synergistic enhancement of NH 3 adsorption performance. The prepared composite material exhibits shows potential for further evaluation in industrial ammonia separation and capture.
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Processes
·
2026
·Vol. 14
·期 8
·1258
·
IF 3.4
Guiping Liao,Hongmei Tang,Jiayan Wu,Quanyun Ye,Yihao Li,Zhongbo Shang,Leiye Sun,Pingxiao Wu
Schwertmannite (Sch) is a widespread iron oxyhydroxysulfate mineral in acid mine drainage (AMD) systems, and its transformation strongly influences the environmental fate of chromium (Cr). However, the role of Ca(II), which is commonly introduced during alkaline neutralization of AMD, in regulating the transformation of Cr(VI)-adsorbed schwertmannite (Cr-Sch) and subsequent Cr redistribution remains insufficiently understood. In this study, transformation experiments were conducted under various pH conditions (3.0, 7.0, and 10.0) to investigate the effects of Ca(II) speciation on mineral transformation and Cr behavior. The results demonstrated that the transformation of Cr-Sch was predominantly pH-dependent. Under acidic conditions, Cr-Sch transformed into goethite via dissolution–recrystallization, resulting in transient Cr release followed by partial refixation. The presence of Ca(II) exerted only a minor influence due to weak interactions between Ca2+and positively charged mineral surfaces. Under alkaline conditions, Cr-Sch preferentially transformed into hematite through dehydroxylation and cation rearrangement, leading to the sustained release of adsorbed Cr(VI). In contrast, Ca(II) predominantly precipitated as CaCO3precipitate (calcite, aragonite, and vaterite) under alkaline conditions, which coated mineral surfaces and inhibited phase transformation and Cr release. These findings reveal that Ca(II) regulates Cr redistribution primarily through pH-dependent speciation and mineral–surface interactions, highlighting coupled geochemical processes governing iron mineral transformation and contaminant mobility in AMD environments. This study provides mechanistic insights for predicting Cr behavior and optimizing alkaline remediation strategies in mining-impacted systems.
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2026
·Vol. 109
·期 9
·e71188
·
IF 4.2
Xi Lan,Guoliang Feng,Jintao Gao,Lei Guo,Yanling Zhang,Zhancheng Guo
The crystal structure of minerals plays a pivotal role in their applications. The V-Cr spinel is the main crystalline phase of high-chromium vanadium slag, and its crystal structure is crucial for the extraction of V and Cr resources. In this study, the phase equilibrium experiments were first conducted on vanadium slag with Cr 2 O 3 contents ranging from 0 to 15 wt.% at 1400°C. The results demonstrated that almost all V and Cr elements crystallized as V-Cr spinel, and the increase in Cr 2 O 3 content promoted the crystallization of V-Cr spinel. Subsequently, three types of V-Cr spinel crystals were obtained via in-situ super-gravity separation at 1400°C, and the corresponding crystal structures were determined based on structural characterization as (Fe 2+ )(Fe 3+ 0.085 ,V 3+ 0.77 ,Cr 3+ 0.145 ) 2 O 4 , (Fe 2+ )(Fe 3+ 0.01 ,V 3+ 0.625 ,Cr 3+ 0.365 ) 2 O 4 and (Fe 2+ )(Fe 3+ 0.005 ,V 3+ 0.475 , Cr 3+ 0.52 ) 2 O 4 , respectively. On this basis, it was found that Cr 3+ ion migrated into V-Cr spinel by replacing Fe 3+ and V 3+ ions, thereby enhancing the stability of the V-Cr spinel and serving as the fundamental reason for the promotion of its crystallization. This study provides additional crystal parameters for V-Cr spinel, which facilitates an understanding of the physicochemical properties of V-Cr spinel and is of great significance for the efficient extraction of V and Cr resources from high-chromium vanadium slag.
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高影响因子
JOURNAL OF RARE EARTHS
·
2026
·
IF 9.6
Mao Zhang,Jiaqing Niu,Bo-Mei Liu,Rongfu Zhou,Haijiao Xie,Yingchun Liu,Wei Liu,Rui Zou,Hui Zhang,Jing Wang
Bioimaging is essential in medical diagnostics and research, yet conventional optical methods are limited by photobleaching and background interference. Although near-infrared (NIR) persistent luminescent (PersL) materials avoid in situ excitation and autofluorescence, their signal decay and shorter-wavelength emission restrict long-term repetitive imaging. Here, we report an oxygen-vacancy-tailoring strategy in LaInO 3 :Nb,Cr, which exhibits broad NIR emission centered at 845 nm, efficient X-ray charging, and repeatable red-light recharging. Benefiting from its high-atomic-number host, LaInO 3 exhibits strong X-ray absorption, while Nb 5+ doping modulates oxygen vacancy (V O ), thereby boosting Cr 3+ NIR PersL by approximately 13 times. In vivo imaging reveals that LaInO 3 :Nb,Cr nanoparticles can be reactivated with a low X-ray dose (0.20 Gy) and repeatedly recharged in situ by red light, highlighting their potential for deep-tissue imaging. This work provides insights into defect-property relationships via ion doping and offers guidance for the rational design of PersL materials for practical applications.
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高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2025
·
IF 4
Yonglin Liu,Shuran He,Hanfei Gao,Xinyi Wang,Qingjian Zhang,Wei Tian,Baorong Duan,Lin Liu
s The study investigated the removal of Cr(Ⅲ) and Cd(Ⅱ) by argillaceous limestone (AL) in a binary adsorption system. The results indicate that AL’s capacity to adsorb Cr(Ⅲ) is enhanced by the presence of Cd(Ⅱ). Conversely, the presence of Cr(Ⅲ) significantly decreases the adsorption of Cd(Ⅱ). The adsorption mechanisms involve precipitation, chelation, and ion exchange. AL’s adsorption behavior was well described by the pseudo-second-order kinetic model, suggesting that the adsorption process was dominated by chemical interactions and the monolayer adsorption pattern. The pH affects adsorption primarily by altering the protonation degree of the AL surface. In the single-component system, the maximum adsorption capacity for Cr(III) reached 30.98 mg·g⁻ 1 at pH 7.0, while that for Cd(Ⅱ) reached 38.80 mg·g⁻ 1 at pH 8.0. In the binary system, Cr(Ⅲ) achieved its highest adsorption capacity (42.56 mg·g⁻ 1 ) at pH 6.0, while Cd(Ⅱ) exhibited a maximum capacity of 19.16 mg·g⁻ 1 at pH 7.0. The presence of Na⁺ and Ca 2 ⁺ ions reduced the adsorption efficiency, with greater inhibition observed as ionic strength increased. This study clarifies the composite adsorption behavior of AL in multi-ion systems and can advance the direct application of natural minerals in environmental pollution remediation.
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产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Hongxing He,Shunfei Li,Xintao Yang,Ying Xu,Siqing Ye,Haonan Dong,Mengye Yang,Ni Yang,Yi Zhang,Zhifeng Nie
Due to the low adsorption capacity, slow adsorption kinetics, and insufficient selectivity of conventional adsorbents in highly acidic environments, therefore, the removal of highly toxic Cr(VI) from industrial metallurgical wastewater remains a great challenge. Herein, a novel superhydrophilic quaternized nanofiber adsorbent was synthesized using electrospinning technology. The superhydrophilic nanofiber adsorbent facilitated water molecule movement during the adsorption process, which increased the system’s free energy and thus promoted the efficient and rapid selective removal of Cr(VI). The adsorbent was completely wetted within 0.06 s and reached a maximum adsorption capacity of 450.33 mg/g in a Cr(VI) solution with an initial concentration of 400 mg/L and equilibrated within 20 min. Adsorption experiments showed that the correlation coefficients of the pseudo-secondary kinetics and Langmuir model of the process were as high as R22 = 0.994 and RL2 = 0.971–0.993, respectively, suggesting that the adsorption process is mainly surface adsorption driven by chemisorption. Moreover, the adsorption mechanism by Zeta potential analysis and XPS and DFT simulations revealed that the selective adsorption for Cr(VI) is the synergistic action of ion exchange and coordination by electrostatic attraction. In addition, the dynamic column adsorption test demonstrated that the adsorbent could adsorb 6000 times its own mass of Cr(VI) ions in metallurgical wastewater, the recovery of Cr(VI) by nanofibers could still reach 89.7% after five cycles, and the removal efficiency was as high as 95.64% in real metallurgical wastewater, which highlighted the potential of its practical application.
研究领域:
环境科学
·
材料科学
·
化学工程
·
水处理
·
纳米技术
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产品关联
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2017
·Vol. 46
·期 47
·16525-16531
·
IF 4.029
Fu-hua Wei,Ding Chen,Zhao Liang,Shuai-qi Zhao,Yun Luo
Fe-Based metal–organic frameworks (Fe-MOFs) were prepared with trimesic acid and FeSO4·7H2O via a microwave-assisted ball milling approach. The structure and thermal stability of the as-prepared Fe-MOFs were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectrometry (FTIR), X-ray photoelectron spectroscopy (XPS), and thermogravimetric analysis (TGA). When used to degrade 20 mg L−1 hexavalent chromium in aqueous solution, the Fe-MOFs were found to completely reduce a 100 mL solution within 120 min under natural light and a 400 mL solution within 90 min under Xe lamp irradiation. Under natural sunlight, 98% of the Cr(VI) was removed from a 40 mL solution after 40 min.
研究领域:
环境化学
·
材料科学
·
纳米技术
·
污染控制
·
光催化
·
水处理
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DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2024
·
IF 10.7
Xueyan Li,Suya Li,Chong Peng,Yuanfei Wang,Yun Li,Shuyi Yang,E. Tao
To avoid the environmental detriment caused by Cr(VI) waste, this study constructs a dual cross-linking network structure using sodium alginate (SA) and polyvinyl alcohol (PVA). Chitosan (CS) is further introduced through electrostatic attraction and hydrogen bonding and SA/PVA/CS (SPC) composite with porous structure is successfully prepared for the removal of Cr(VI) from wastewater. Batch adsorption experiments show that SPC has excellent adsorption capacity and practical usability with a broad pH applicability range. Under optimal adsorption conditions (pH = 2, t = 150 min, T = 35 °C, m/ V = 2 g/L, C 0 = 10 mg/L), the Cr(VI) removal rate of SPC achieves 89.2 %. Adsorption kinetics and isotherm models indicate that the adsorption process is primarily multi-layer and chemical adsorption. Additionally, FT-IR and XPS reveal that the adsorption mechanism of SPC for Cr(VI) involves a synergy of electrostatic attraction, reduction, ion exchange and complexation. Density functional theory (DFT) simulations also confirm the dominant role of CS in the Cr(VI) adsorption. In summary, SPC shows great potential for Cr(VI) wastewater treatment.
研究领域:
环境科学
·
材料科学
·
化学工程
·
水处理技术
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高影响因子
ENVIRONMENTAL POLLUTION
·
2020
·
IF 6.793
Chuanqi Tang,Yiming Zhang,Jiangang Han,Ziqi Tian,Liang Chen,Jianqiang Chen
Supported carbon quantum dots (CQDs), used as fluorescent sensors for the detection of metal ions , have rarely been used to remove heavy metals from water. Nitrogen-doped CQDs immobilized in hydrophilic silica hydrogels exhibited a more superior sensitivity and selectivity for the detection of Re(VII) and Cr(VI) than other metal ions, including Fe(III), Fe(II), Zn(II), Cu(II) and Mn(II). For the first time, low limits of detection (LOD) of 2.3 μM for Re(VII) detection and 65 nM for Cr(VI) detection were reported by a facile method. Based on the high selectivity of fluorescent silica hydrogels for Re(VII) and Cr(VI) detection, the removal of Re(VII) and Cr(VI) by graphene oxide (GO) in water was monitored with the hydrogels used as a turn-off fluorescent sensing platform. The consistent results of the sorption isotherms of each metal on GO, which were obtained from the fluorescence spectra and by UV absorption, further verified the possibility of monitoring metal removal by fluorescence detection. Remarkably, GO removed 1186 mg/g of Re(VII) but only 178 mg/g of Cr(VI). The density functional theory (DFT) calculations indicated that both Re(VII) and Cr(VI) formed stable bonds with silica hydrogels, confirming that the interactions between the metal ions and the substrate would promote the fluorescence quenching of the supported CQDs. On the other hand, Re(VII) interacted more strongly with the carboxyl groups of GO than Cr(VI). In addition, a real-time detection system was designed to alarm the service life of a GO filter used for Re(VII) removal.
研究领域:
环境科学
·
材料科学
·
化学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Hesong Wang,Jinlong Wang,Jing Zhao,Han Zhang,Luming Liu,Xueying Sun,Guibai Li,Heng Liang
As an emerging metal organic framework (MOF) material, MIL-101(Cr) has a large specific surface area and good hydraulic stability, making it ideal in applications before ultrafiltration (UF). However, the unclear interaction between MIL-101(Cr) and natural organic matter (NOM) was identified as the main limitation to understand membrane fouling. To reveal the working mechanisms of NOM removal using MIL-101(Cr), an integrated system of MOF and UF was constructed and operated in separation mode (SM) and coating mode (CM). Based on the results, MIL-101(Cr) had a high NOM adsorption capacity of 68.454 mg/g for HA and 174.725 mg/g for BSA at saturation. Permeate quality improvement occurred in both modes over a 37.7% UV 254 removal rate and a 15% fluorescence intensity decrease, and permeation performance of the hybrid system was simultaneously enhanced. We found that MIL-101(Cr) influenced membrane fouling behaviors and models because of the foulant transformation in SM and dispersed NOM in the MIL-101(Cr) layer in CM. Furthermore, MIL-101(Cr) played a dual role in the integrated system. It could remove NOM by adsorption, leading to membrane fouling reduction, but also caused additional filtration resistance. Notably, MIL-101(Cr) showed the overall positive effects due to its open hollow structure and good hydrophilicity. The π-π interactions and salt-bridges between MIL-101(Cr) and NOM played a dominant role in adsorption. Whilst SM was more efficient in membrane fouling mitigation due to reduced membrane fouling resistance and a normalized flux increase above 15%, CM could achieve the same permeate quality with less MIL-101(Cr) usage and reaction time. This study reveals the interaction between MIL-101(Cr) and NOM and their effects on UF, providing a scientific basis for the widespread application of MOFs.
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高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Dongmei Jia,Yuejin Li,Huamin Cai,Yongzheng Duan,Jing Li,Chen Ling
Capture of heavy metal ions from aqueous solutions is a critical but challenging step in environmental treatment. In this work, NH2-MIL-101(Fe) nanoparticles were synthesized by simple solvothermal methods and applied to capture Cr(VI) anions from aqueous solutions. The results revealed that NH2-MIL-101(Fe) exhibited a high capture capacity (375.2 mg g–1) and an ultrafast capture rate (4 min reaching equilibrium). The competitive effects of coexisting ions such as Cl–, HCO3–, PO43–, Cd2+, Ca2+, and Cu2+ on Cr(VI) are very weak, suggesting that the adsorption selectivity significantly enhanced by loading amino groups on MIL-101(Fe). Density functional theory (DFT) calculation was performed to better understand the adsorption mechanism of Cr(VI), showing that the amino groups could increase the adsorption energy of Cr(VI) for enhancing the adsorption capacity. Based on powder X-ray diffraction, X-ray photoelectron spectroscopy, and DFT calculations, the Cr(VI) capture mechanism by NH2-MIL-101(Fe) nanoparticles was a combination of coordination between Fe and Cr(VI), electrostatic interaction between Cr2O72– and the protonated amino group, and reduction of Cr(VI) to Cr(III).
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高影响因子
危险品化学品经营许可证（带存储）