SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Dongxue Fu,Guifang Wang,Li Zhao,Yuwen Hong,Baoming Yang,Huiling Cheng
Green ion-imprinting technique was applied to construct a Cr(III) ion-imprinted absorbent material from an amino functionalized chitosan derivative. First, nitrogenous organic compounds (GACS) as functional monomer is synthesized by a Schiff base reaction followed by a grafting reaction. In the end, imprinting was completed by cross-linking with epichlorohydrin (ECH) in aqueous media and eluting the coordinated ions with hydrochloric acid to obtain chromium-imprinted polymers (Cr(III)-IIP) with pores. The relevant parameters of the imprinting system were explored, and the superior polymer (Cr(III)-IIP 9 ) has an excellent adsorption capacity 385.89 mg/g, wide pH range adsorption, good adsorption rates and equilibrium times (≤120 min) for Cr(III) ion. Additionally, the kinetic study is best defined in terms of pseudo-second order, while the Freundlich isotherm model fits the data well. Competitive adsorption of the quaternary system of Cr(III)/ Cd(II)/ Ni(II)/ Cu(II) were also investigated, it demonstrated a greater affinity for the Cr(III) ion than other ions. Hence, the imprinting materials prepared by amino functionalized chitosan enhances the adsorption of Cr(III) ions in the simulation of actual water sample. The adsorption mechanism accords with the hard and soft acid and base theory (HSAB), which is expected to be is utilized for the separation of Cr(III) ions in the environment.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Fujin Sun,Yanchuang Zhou,Chao Zhang,Meng Liu,Biao Yuan,Wei Jiang
Titanium-based microspheres exhibit exceptional adsorption properties and remarkable photocatalytic reduction capabilities. With a bandgap of 3.14 eV a conduction band potential of −0.23 eV, these microspheres can effectively reduce V 5+ to V 2+ and Cr 6+ to Cr 3+ . A mixed V 5+ -Cr 6+ solution at a total concentration of 400 mg/L can be treated to meet national emission standard within 60 min. The microspheres demonstrate deposition capacity of 278.65 mg/g for V 5+ and 479.30 mg/g for Cr 6+ . In the photocatalytic process, photogenerated electrons facilitate the reduction and deposition of vanadium and chromium ions onto the catalyst surface without destroying the functional groups. Under acid and alkaline conditions, selective elution enables the recovery of vanadium (263.3 mg/L, 99.82 % purity) and chromium (143.4 mg/L, 99.73 % purity). By integrating adsorption and photocatalysis, novel ion-imprinted materials can be developed for selective adsorption of V 5+ , purity of ∼99.50 % V 5+ solution can be achieved over five cycles. Additionally, the titanium-based microspheres demonstrate effective utilization of natural light and can effectively treat actual vanadium-chromium wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Energy & Environmental Science
·
2018
·Vol. 11
·期 2
·407-416
·
IF 30.067
Yingfang Yao,Zhe Xu,Feng Cheng,Wenchao Li,Peixin Cui,Guangzhou Xu,Sheng Xu,Peng Wang,Guodong Sheng,Yadong Yan,Zhentao Yu,Shicheng Yan,Zhaoxu Chen,Zhigang Zou
Graphene-based electrocatalytic materials are potential low-cost electrocatalysts for the oxygen evolution reaction (OER). However, substantial overpotentials above thermodynamic requirements limit their efficiency and stability in OER-related energy conversion and storage technologies. Here, we embedded CrN crystals into graphene and in situ electrochemically oxidized them to construct graphene materials with encapsulated Cr6+ ions (Cr6+@G). These Cr6+@G materials exhibit the lowest OER overpotential of 197 mV at 10 mA cm−2 and excellent stability over 200 h at a high current density of about 120 mA cm−2 in an alkaline electrolyte. Spectroscopic and computational studies confirm a stable ion coordination environment significantly benefiting the downshift of the graphene Fermi level via hybridization of C p orbitals with d orbitals of Cr6+ ions that enhances the OER activity and stability.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 11
·11126-11139
·
IF 2.914
Li Zhenyuan,Pan Zhidong,Wang Yanmin
A raw illite-smectite mixed-layered clay (RI/S) was ground for preparing nano-sized I/S clay (NI/S) and subsequently amino-functionalized via grafting of 3-aminopropyltrithoxysilane (APTES) (NH 2 -RI/S and NH 2 -NI/S, respectively). The samples were characterized by particle size analysis, specific surface area measurement, X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), and 29 Si nuclear magnetic resonance ( 29 Si NMR). Compared to RI/S, NI/S has a narrow particle size distribution and appears in a platelet-like morphology due to the disintegration/exfoliation of RI/S after grinding. Based on the 29 Si NMR spectra, the appearances of tri-silicate units indicate the chemically grafting of APTES molecules on NH 2 -RI/S and NH 2 -NI/S, respectively. NH 2 -NI/S can adsorb greater amounts of Pb(II) cations and Cr(VI) anions rather than NH 2 -RI/S since NH 2 -NI/S grafts more amounts of amine groups (-NH 2 ). The isotherm data for adsorption of Pb(II) cations and Cr(VI) anions can be described by the Langmuir model at different temperatures (i.e., 10 °C, 30 °C, and 50 °C), respectively. The maximum adsorption amounts of Pb(II) cations and Cr(VI) anions onto NH 2 -NI/S calculated by the Langmuir isotherm model are 131.23 mg/g and 36.91 mg/g at 50 °C, respectively. The adsorptions of Pb(II) cations and Cr(VI) anions onto NH 2 -NI/S involve in the surface complexation of NI/S and amine groups.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYST
·
2019
·Vol. 144
·期 12
·3807-3816
·
IF 4.019
Xiaojun He,Chenglin Wu,Yuna Qian,Yahui Li,Lilei Zhang,Feng Ding,Hong Chen,Jianliang Shen
Over the past decades, gallium (Ga) compounds have gained importance in the field of cancer treatment. Gallium acts as an iron mimic and disturbs iron-dependent propagation and other processes in tumor cells. However, the toxicity of gallium was also well documented in vitro and in vivo in animals. Though the oral administration of gallium in humans is less toxic, it has also been shown that a long period of administration could induce tumor fibrosis. Chromium (Cr), a naturally occurring heavy metal, is commonly used in industrial processes and can cause severe health problems in humans. It has been found to be closely involved in the metabolism of nucleic acids, proteins and fats in humans. Cr(III) salts can be used as micronutrients and dietary supplements. However, similar to gallium (Ga3+), chromium (Cr3+) can build up to an excessive degree that is harmful to the human body. Therefore, it would be of great interest to develop chemosensing for the selective and sensitive detection of gallium and chromium ions in vitro and in vivo. Herein, we reported that an NBD-based (4-chloro-7-nitrobenzo-2-oxa-1,3-diazole) fluorescent probe (NBDT) was fabricated with demonstrated extraordinary specificity and sensitivity. A swift response toward Ga3+ and Cr3+ ions was discovered using fluorescence enhancement over a wide pH range and with cycle stability. Furthermore, lighted up by Ga3+ and Cr3+ ions in vitro, this NBDT sensor was successfully applied to detect exogenous Ga3+ and Cr3+ ions in MDA-MB-231 and HepG2 cells. Additionally, using zebrafish as the in vivo model, we demonstrated the capability of this NBDT for detecting and imaging Ga3+ and Cr3+ ions in zebrafish. Taken together, this NBDT has indicated great potential for detecting and monitoring Ga3+ and Cr3+ ions in vitro and in vivo.
研究领域:
生物化学
·
医学
·
分析化学
✓ 已验证
DOI
PubMed
高影响因子
Analytical Methods
·
2020
·Vol. 12
·期 41
·4996-5003
·
IF 2.596
Jingzhou Hou,Zhengfan Shui,Jiawei Li,Danqun Huo,Xiaohui Tang,Chenhui Yu,Qiang He,Cailin Qiao
Different valence states of chromium ions possess huge differences in toxicity. Hence, it is an innovative idea to design a reasonable probe to detect Cr according to the toxicity characteristics of different valence states. We report a novel, rapid, simple and accurate probe for the detection of Cr3+ and Cr6+ ions. As a probe, gold nanoparticles (Au NPs) are successfully modified using tartaric acid (TA) and 2-[4-(2-hydroxyethyl)-1-piperazinyl] ethanesulfonic acid (HEPES) via a two-step modification; the probe shows an increase in the sensitivity towards Cr6+ and decreases towards Cr3+, which is consistent with their toxicity characteristics, benefiting the assessment of total Cr toxicity. The proposed probe achieves considerable two-channel (ultraviolet absorption spectrum and naked eye vision) detection of Cr3+ and Cr6+ providing wide linearity regions and low detection limits. Meanwhile, the results of the interference experiments and analysis of the real samples showed high selectivity and accuracy of the proposed method. With popularization, this method possesses great potential in environmental monitoring and control.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
IONICS
·
2025
·
IF 2.6
Li Runze,Guo Yang,Yuan Shiling,Liu Gang,Lin Meng
Iron-chromium flow battery is considered one of the preferred technologies for large-scale energy storage facilities due to its advantages of low pollutability, less cost and high safety. However, the poor reversibility of the Cr 3+ /Cr 2+ redox reaction at the anode of iron-chromium flow batteries, the low activity and the susceptibility to hydrogen evolution reaction are the primary problems that restrict the development and application of this battery. On the basis of graphite felt electrodes, we prepared bismuth-lead oxides co-modified graphite felt electrodes via acid etching and electrodeposition method to improve the electrochemical performance in the reaction kinetics. The structural and catalytic properties of the materials were characterized and evaluated by scanning electron microscopy, X-ray photoelectron spectroscopy, X‐ray diffraction spectroscopy and electrochemical methods, respectively. The results show that with the help of the interaction between Bi and Pb elements, the successfully prepared modified electrode not only improves the reversibility and reaction rate of the electrochemical redox reaction of Cr 3+ /Cr 2+ but also effectively inhibits the occurrence of hydrogen evolution reaction.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 187
·期 1
·1-10
·
IF 5.479
Wang Ziyi,Lu Yuexiang,Pang Jiawei,Sun Jingwei,Yang Fengyi,Li Hui,Liu Yueying
The authors have studied the role of different ligands on the surfaces of silver nanoplates for regulating their analytical applications. Citrate-capped silver nanoplates are applied for the detection of chromium ions (Cr 3+ ) based on aggregation of silver nanoplates. Cr 3+ can cause aggregation through high affinity between Cr 3+ and carboxylate groups of citrates, resulting in a color change from dark yellow to purple and at last colorless. The detection limit is 8.0 nM. This system shows excellent selectivity in the presence of a variety of other metal ions. Further, silver nanoplates coupled with iodide ions are employed for the colorimetric determination of copper ions (Cu 2+ ) based on a new strategy of fusion/oxidation etching nanoplates. When Cu 2+ is introduced into this silver nanoplate system, Cu 2+ can oxidize I − to iodine (I 2 ), which can further oxidize silver to form silver iodide (AgI). Simultaneously, the solution color changes from dark yellow to colorless. The lower limit detection is 0.27 μM. This assay exhibits excellent selectivity for Cu 2+ over other environmental metal ions. It is perceived that this design concept will open up a fresh insight of simple, rapid and reliable detection of other heavy metal ions in drinking water and environmental samples.
Iodide-assisted silver nanoplates can be used for the colorimetric and visual ldetermination of Cr 3+ and Cu 2+ based on an aggregation/fusion/oxidation etching mechanism. These systems allows selective and sensitive determination of the ions in real samples.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Yuxuan Zhao,Yueli Wen,Xiaonuo Xu,Maohong Fan,Shiyun Guo,Zhiju Chen,Xiaoxiao Zhao,Bin Wang,Wei Huang
The heavy metals discharged from electroplating wastewater, represented as copper and chromium ions, is harmful to aquatic lives and human beings, and will break the ecological balance. In this work, magnetic hybrid porous structure adsorbent of Fe 3 O 4 @SiO 2 -UiO-66-EDTA is prepared for recycling copper and chromium ions. The adsorbent exhibits a maximum adsorption capacity of 212.10 mg/g for Cu(II) and 118.10 mg/g for Cr(VI). Notably, it shows excellent regenerability of 87.12% after 5 cycles. The adsorption of Cu(II) and Cr(VI) on Fe 3 O 4 @SiO 2 -UiO-66-EDTA follows the pseudo-second-order model, where chemical adsorption is dominant and it occurs spontaneously and exothermally. Based on XRD, FTIR, XPS, and DFT calculations, the adsorption mechanisms are driven by electrostatic attraction, chelation, and redox reactions. This work provides a novel and promising strategy for designing highly efficient adsorbents, paving the way for more effective treatments of electroplating wastewater contaminated with Cu(II) and Cr(VI).
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2017
·Vol. 9
·期 48
·19139-19144
·
IF 7.367
Jianjun Du,Haoying Ge,Quanyong Gu,Hong Du,Jiangli Fan,Xiaojun Peng
In this work, an N-T/gold nanoparticle system was assembled for the convenient and colorimetric identification of Cr based on its coordination chemistry with the thymine derivative (N-T). In addition to the visible colorimetric changes for the qualitative Cr identification, the A630 nm/520 nm values changed linearly with Cr concentration over a range of 0.5–2.5 μM and the detection limits reached 0.03 μM and 0.07 μM for Cr3+ and Cr2O72−, respectively, both of which satisfied the Cr water quality standards of the U.S. EPA, WHO and China. Furthermore, a more convenient method was developed for quantitative determination of Cr concentrations in practical samples based on the Eyedropper function in Microsoft's PowerPoint software, wherein the RGB (red, green and blue) value of the sample could be easily screened in the colorimetric card for a more accurate result with good recovery, avoiding complicated instrumentation.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Kaijun Li,Ruiquan Yu,Ruixin Zhu,Ruifeng Liang,Gongyan Liu,Biyu Peng
In this work, pH-sensitive and chromium-loaded mineralized nanoparticles (Cr-PPA NPs) were developed by self-assembly of poly (poly(ethylene glycol) methyl ether acrylate-co-acrylic acid) (poly(PEG-co-AA)) copolymers templated Cr(OH)3 mineralization. The Cr-PPA NPs exhibit excellent colloidal stability in water with high salt concentration, protein, and pH above 3.0. As a novel chrome tanning agent, such Cr-PPA NPs could effectively protect and deliver chromium into pickled pelt without reacting with collagen fibers during the penetration process, due to its antifouling PEG surface and nanosize. When the interior pH of the pickled pelt was lower than 2.5, the dissolution of the mineralized Cr(OH)3 core would cause disassembly of Cr-PPA NPs and rapid release of Cr3+ ions, leading to uniform chromium distribution in leather. After basifying, the released Cr3+ ions would cross-link the carboxyl groups both on collagen fibers and poly(PEG-co-AA) copolymers, resulting in chromium adsorption efficiency in leather higher than 90% and less chromium discharge in wastewater. Simultaneously, the resultant leather was given enhanced hydrothermal stability and physical properties based on above efficient chromium cross-linking. Compared with traditional chrome tanning agent, this pH-sensitive Cr-PPA NPs can really break through the existing balance limitation between chromium penetration and combination in the conventional tanning process and become a promising strategy for cleaner leather production.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
·
IF 4.464
Cheng Liu,Lei Jin,Jia-Qiang Yang,Fang-Zu Yang,Zhong-Qun Tian
In this paper, the effects of complexing agents (oxalic acid and glycine) and Fe(II) ions on the electro-reduction of Cr(III) ions are studied carefully. Based on the electrochemical analyses, both the complexing agents and Fe(II) ions can obviously decrease the cathodic polarization in the electro-reduction of Cr(III) ions, and the Fe(II) ions can also be co-deposited with Cr(III) ions. One water molecule in [Cr(III)(H 2 O) 6 ] 3+ ion is substituted by one oxalic acid or glycine to form an electrochemically active penta-aqua-Cr(III) coordination ion. In situ infrared spectroscopy and energy dispersive spectroscopy reveal the typical induced-deposition mechanism of ferrochrome alloy. Fe(II) ions are firstly reduced to Fe crystal nuclei, then Cr and Fe atoms grow on the Fe nuclei to form ferrochrome alloy.
研究领域:
电化学
·
材料科学
✓ 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）