MICROCHEMICAL JOURNAL
·
2026
·
IF 5.2
Guo Chen,Guang-Zhen Wan,Juan Chen
The escalating global consumption of Traditional Chinese Medicine (TCM) necessitates robust quality control, particularly against contaminants like highly toxic hexavalent chromium (Cr(VI)), which must be distinguished from its essential trivalent counterpart (Cr(III)). In this study, a novel nanozyme-based colorimetric assay is presented for chromium detection, utilizing a zeolitic imidazolate framework-67 encapsulated iron-quercetin nanocomposite (Fe-QueNPs@ZIF-67). The core-shell nanostructure was synthesized through a facile one-pot method at room temperature, in which the ZIF-67 shell served as a sacrificial template to prevent agglomeration of the core Fe-QueNPs, thus preserving their intrinsic catalytic activity. In a buffer medium, the ZIF-67 framework disassembled, uniform dispersing Fe-QueNPs uniformly and releasing Co 2+ ions. A bimetallic complex was formed through synergistic coordination of Co 2+ with Fe 3+ and quercetin ligands, significantly enhancing the peroxidase-like activity of nanozyme. This improved catalytic activity promoted the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) by H₂O₂. Importantly, a differential response to chromium species was observed: the catalytic reaction was inhibited by Cr(III), leading to signal reduction, whereas it was promoted by Cr(VI), resulting in signal amplification. This dual-response modulation enabled selective and sensitive quantification of Cr(III) (linear range: 10–1000 μM, LOD: 8.8 μM) and Cr(VI) (linear range: 0.5–70 μM, LOD: 0.36 μM). The method was successfully applied to TCM samples, achieving excellent recoveries (95–105%). This work provides a robust and sensitive platform for chromium speciation, offering a promising tool for quality control of herbal medicines and broader environmental monitoring.
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INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Mianmian Wu,Nan Li,Shixiang Zuo,Wenjing Shen,Guifang Sun,Qingfei Li,Minghao Shi,Jiangquan Ma
Piezocatalysis is a promising technology to address environmental pollution by converting mechanical energy into chemical energy. Herein, MoSe2 nanosheets with different 1T phase percentages (ranging from 30 to 80%) were constructed by adjusting hydrothermal temperature. Moreover, the roles of phase engineering in the piezocatalysis were thoroughly investigated by degrading rhodamine B and reducing Cr(VI) in ultrasonic vibration conditions. In particular, MoSe2 prepared at 220 °C (MoSe2-220) exhibits ultrahigh observed constant kobs and degradation rate k, which is superior to most reported catalysts to date. The experimental results indicate that the introduction of the 1T phase increases the active sites of the material, improves the conductivity, and inhibits the recombination of electrons and holes. Moreover, an internal electric field in the 2H phase induced by piezoelectric polarization is facilitated to separate electron–hole pairs, enabling the degradation and reduction to proceed. The capture experiments and EPR tests further confirm that •O2– and •OH are main reactive species, and a rational mechanism is finally put forward. This study offers a clear understanding of phase engineering in piezocatalysis and provides an efficiency strategy to construct highly efficient piezocatalysts.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·
IF 5.8
Yang Yanzhi,Xu Mingchen,Jin Wenlou,Jin Jiacheng,Dong Fan,Zhang Zhipeng,Yan Xin,Shao Min,Wan Yushan
In this study, a polyaniline/mesoporous silica (PANI/MCM-41) composite material that can be used as a filler for permeable reactive barrier (PRB) was prepared by in situ polymerization. Firstly, the adsorption capacity of PANI/MCM-41 on Cr (VI) in solution was investigated. The results show that the prepared PANI/MCM-41 exhibits a significant Cr (VI) adsorption capacity (~ 340 mg/g), and the adsorption process is more accurately described by the Langmuir isotherm and pseudo-second-order kinetic model. The thermodynamic functions evidenced that the Cr(VI) adsorption was an endothermic spontaneous process. In addition, adsorption–desorption cycle experiments proved the excellent reusability of the material. Subsequently, the material was utilized as a filler in the PRB for the remediation of Cr(VI)-contaminated soil using electrokinetic-permeable reactive barrier (EK-PRB) technology. The results show that compared with traditional electrokinetic remediation, the use of PANI/MCM-41 as an active filler can enlarge the current during remediation and enhance the conductivity of soil, which increases the removal rates of total Cr and Cr(VI) in soil (17.4% and 10.2%).
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ACS Applied Nano Materials
·
2019
·
IF 0
Yi Feng,Qian Chen,Mengjue Cao,Nan Ling,Jianfeng Yao
Defect engineering and surface chemistry are closely related to the performance of materials. In this work, the effects of Zr precursors and Ti substitution on the photocatalytic performance of UiO-66-NH2 are studied and analyzed from the perspective of defect engineering and surface chemistry. The findings show that when using ZrOCl2·8H2O as the Zr precursor combined with the postsynthetic treatment of Ti substitution, sample U-OCl-Ti shows significant improvement in Cr(VI) adsorption (20.9 mg/g) and photocatalytic reduction of Cr(VI) under visible light. The improvement can be attributed to the highly defective framework and more -NH2 groups exposed on the surface; therefore the highest light absorption and lowest recombination rate of photogenerated electron–hole pairs are observed in U-OCl-Ti. The findings in this study contribute to a better understanding of how defects and surface chemistry affect the photocatalytic performance, thus providing some designing knowledge for the synthesis of UiO-66 or UiO-66-NH2 with high photocatalytic performance.
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TALANTA
·
2013
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IF 3.498
Hong-mei Jiang,Ting Yang,Yan-hong Wang,Hong-zhen Lian,Xin Hu
A new approach of magnetic solid phase extraction (MSPE) coupled with graphite furnace atomic absorption spectrometry (GFAAS) has been developed for the speciation of Cr(III) and Cr(VI) using zincon-immobilized silica-coated magnetic Fe 3 O 4 nanoparticles (Zincon–Si–MNPs) as the MSPE absorbent. Cr(III) was quantitatively reserved on the absorbent at pH 9.1 while total Cr was reserved at pH 6.5. The absorbed Cr species were eluted by using 2 mol/L HCl and detected by GFAAS. The concentration of Cr(VI) could be calculated by subtracting Cr(III) from total Cr. All the parameters affecting the separation and extraction efficiency of Cr species such as pH, extraction time, concentration and volume of eluent , sample volume and influence of co-existing ions were systematically examined and the optimized conditions were established accordingly. The detection limit (LOD) of the method was 0.016 and 0.011 ng mL −1 for Cr(III) and Cr(VI), respectively, with the enrichment factor of 100 and 150. The precisions of this method (Relative standard deviation, RSD, n =7) for Cr(III) and Cr(VI) at 0.1 ng mL −1 were 6.0% and 6.2%, respectively. In order to validate the proposed method, a certified reference material of environmental water was analyzed, and the result of Cr speciation was in good agreement with the certified value. This MSPE–GFAAS method has been successfully applied for the speciation of Cr(III) and Cr(VI) in lake and tap waters with the recoveries of 88–109% for the spiked samples. Moreover, the MSPE separation mechanism of Cr(III) and Cr(VI) based on their adsorption–desorption on Zincon–Si–MNPs has been explained through various spectroscopic characterization.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2019
·
IF 4.182
Hao-Miao Wang,Yan Chen,Xi Yan,Wan-Zhong Lang,Ya-Jun Guo
CrO X- doped mesoporous silica spheres (Cr/MSS-X) were prepared by adding Cr precursors at different preparation stages using sol-gel method (X = 1, 2, 3) and incipient-wetness impregnation method (X = 4), and their catalytic performances of propane oxidative dehydrogenation were evaluated in the presence of CO 2 . The results indicate that for the Cr/MSS-X catalysts prepared by sol-gel method, Cr adding time significantly influences the Cr dispersion, surface physic-chemical properties and their catalytic performance. Cr/MSS-2 catalysts obtained by adding Cr precursor after the tetraethyl-orthosilicate (TEOS) show the optimal catalytic activity. Although Cr/MSS-1 also shows good CrO X dispersion, part CrO X wrapped in the center of mesoporous silica spheres presents weaker catalytic activity. In this work, the catalyst preparation method is quite facile and has the potential to be utilized for industrial production.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 27
·期 15
·17446-17457
·
IF 2.914
Gao Zhao,Yang Hanpei,Fu Xiaofei,Jin Qiu,Wu Qiangshun,Kang Li,Wu Junming
Slow and random transfer of pollutants and photo-induced carriers on photocatalysts causes loss of efficiency in photodegradation of contaminants. Enhancing and directing mass transfer of them are considered as two major methods for improving the photodegradation of pollutants over photocatalysts. Here in this work, we focused on the design of a novel photocatalyst which not only accelerated the transfer rate of Cr(VI) and electrons but also provided specific transfer routes for them. By careful characterizations, it is indicated that 2-((2-(2-aminoethylamino)ethylimino)methyl)phenol (AEMP) was covalently attached onto activated carbon (AC), which enhanced Cr(VI) transfer from bulk solution to AC through electrostatic or coordinative interactions. The external mass transfer coefficient ( K f ) of Cr(VI) over TiO 2 /AC-AEMP was estimated as 1.75 × 10 −6 m s −1 , which was ~ 12.79 and ~ 5.96 times that of TiO 2 and TiO 2 /AC, respectively. Dense and homogeneous heterojunctions between AC and TiO 2 were acquired synchronically by forming Ti–O–C linkages, which increased traveling of electrons from TiO 2 to AC. Accordingly, Cr(VI) can capture photo-induced electrons on the surface of AC via concrete routes and then be reduced efficiently. The results showed that the photoreduction rate of Cr(VI) on TiO 2 /AC-AEMP reached to ~ 92.7%, and the overall photocatalytic activity of this well-designed TiO 2 /AC-AEMP has been enhanced significantly by 5.5 times compared to TiO 2 /AC. The enhanced photocatalytic activity of TiO 2 /AC-AEMP was mainly attributed to an improved synergetic process of mass transfer–induced adsorption–photoreduction by forming specific transfer routes for accelerative motion of Cr(VI) and electrons. This work provides a feasible strategy to improve the photoactivity of photocatalysts for the degradation of pollutants by effective mass transfer.
Graphical abstract
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Shuo Liu,Yufan Zhang,Lin Hao,Wei Shen,Anaclet Nsabimana,Shigang Shen
The development of cost-effective and efficient electrocatalysts for water electrolysis is crucial for sustainable hydrogen production. In this study, we designed a hierarchical Cr-CoFe-LDH composite using a tailored etching and doping strategy to enhance catalytic performance. By integrating mesoporous CoFe-LDH layers with C 2 O 4 2− anions and Cr dopants, we engineered a structure that optimizes mass transport, strengthens electronic interactions at active sites, and stabilizes key catalytic species. In situ spectroscopic analysis provided direct evidence of active species evolution, offering insights into the underlying reaction mechanisms. As a result, the Cr-CoFe-LDH catalyst exhibited excellent oxygen evolution reaction (OER) activity, demonstrating enhanced intrinsic performance and long-term stability. This work presents a novel approach to designing high-performance LDH-based catalysts and advances the understanding of active site modulation for efficient water electrolysis.
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Journal of Water Process Engineering
·
2022
·
IF 7.34
Zongying Zhang,Qinze Liu,Tingting Gao,Congde Qiao,Jinshui Yao,Changbin Zhang
Alkaline lignin, a by-product of the paper-pulping process, can undergo phenolation by pyrogallol in the presence of acetone and sulfuric acid to prepare phenolated-alkaline-lignin (PAL). PAL can be further reacted with tetraethylenepentamine (TEPA) to prepare lignin-based catecholamine (PAL-TEPA), which exhibits excellent ability to remove hazardous Cr (VI) from simulated wastewater. In this study, PAL and PAL-TEPA were systematically investigated by SEM, FT-IR, 1 H NMR, TGA, and XPS. The conditions for the preparation of PAL and the various variables affecting the adsorption behavior of PAL-TEPA were optimized sequentially. The adsorption process followed the pseudo-second-order model and fitted to the Langmuir isotherm equation. The maximum adsorption amount reached 600 mg g −1 ( R = 75 %) under optimized conditions (pH = 2.0, C 0 = 200 mg L −1 , V = 100 mL, T = 30 °C, dos. = 25 mg, t = 24 h). Toxic Cr (VI) ions were successfully converted to harmless Cr (III) ions and removed by PAL-TEPA adsorbent. This approach opens new avenues for the utilization of lignin and new kinds of adsorbent for Cr (VI) removal.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Aiqun Kong,Yawei Sun,Mao Peng,Hongzhi Gu,Yan Fu,Jinli Zhang,Wei Li
Amino-functionalized MXenes (NH 2 -Ti 3 C 2 T x ) were constructed with the feature of strong adsorption but also reduction ability for Cr(VI) ions in aqueous solution, via in situ polymerization of (3-aminopropyl)triethoxysilane (APTES) onto the surface of multilayer Ti 3 C 2 T x . Amino groups and Ti 3 C 2 T x nanosheets exhibit synergistic effects in the adsorption and reduction of Cr(VI) anions. The maximum adsorption capacities for Cr(VI) onto NH 2 -Ti 3 C 2 T x -0.5 calculated by Langmuir model are 107.4 mg/g. Meanwhile, Ti(Ⅱ) species and -NH 3 + are individually oxidized into Ti(Ⅳ) species and NO 3 − during the removal of Cr(VI). The NH 2 -Ti 3 C 2 T x -0.5 nanosheets exhibit high selectivity and reusability for Cr(VI) removal. Density functional theory calculations illustrate that the synergy between Ti and N remarkably boost the binding energy of MXene toward Cr(VI) along with the electron density on MXene surface. This work provides deep insights into functionalized MXene nanosheets in the fields of heavy metal remediation.
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Biomass Conversion and Biorefinery
·
2024
·
IF 3.5
Zhang Wenrui,Huang Jintian
The non-biodegradability and microtoxicity of harmful anions in water, especially hexavalent chromium, have caused serious damage to the environment and human health. Therefore, research on efficient and environmentally friendly adsorbents for the removal of Cr(VI) becomes essential. In this paper, we propose for the first time to effectively remove Cr(VI) anion by aminated graphene oxide/cellulose oxide nanocellulose/sodium alginate porous materials (NH 2 -GO/NOC/SA) prepared by cross-linking aminated graphene oxide with biomass materials (oxidized nanocellulose and sodium alginate) via epichlorohydrin. The porous materials were characterized using tools such as Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), electroluminescence (EDS), Brunauer Emmett Teller (BET), and X-ray photoelectron spectroscopy (XPS) analysis. The optimum adsorption performance of the porous material was obtained by varying the initial concentration (from 100 to 500 mg/L), pH (from 1 to 8), and adsorption time (from 15 min to 72 h) of the Cr(VI) solution. The analysis of the adsorption data showed that the adsorption process was more in line with the pseudo-second-order kinetic equation and Langmuir isotherm model, and the equilibrium adsorption amount reached 394.1 mg/g. The adsorption of Cr(VI) on the NH 2 -GO/NOC/SA porous material was achieved by electrostatic interactions, Schiff base chemical bonding energy, ion exchange, protonation, precipitation, and hydrogen bonding. In conclusion, the experimental results show that the biomass adsorbent NH2-GO/NOC/SA can be consistently applied to remove Cr(VI) from wastewater. Graphical
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 34
·e52799
·
IF 3.057
Wei Jia,Jiang Du,Ming Jiang,Mengying Zhang,Enlin Han,Hongqing Niu,Dezhen Wu
In order to overcome the shortcomings of nanofiber membranes such as low mechanical properties and poor acid resistance, amino-rich functionalized polyimide (PI)-polyethyleneimine (PEI) fibers were successfully prepared in the study. The structure and morphology in each functionalization step were characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM), static contact angle, attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR), and X-ray photoelectron spectroscopy (XPS) measurements. The adsorption kinetics analysis showed that the adsorption process followed a pseudo-second-order model, and the adsorption isotherm could be described better by the Langmuir model indicating the adsorption process was mainly chemical and homogeneous monolayer adsorption. Furthermore, the maximum adsorption capacity based on the Langmuir model was about 50 mg g −1 , and the calculated thermodynamic parameters demonstrated an endothermic process. Meantime, the PEI-grafted PI fibers also exhibited good regeneration performance and stable tensile strength during recycling tests process. In the first 3 adsorption–desorption cycles, the removal efficiency and tensile strength of PI-PEI fibers could be maintained up to 60.44% and 89.29% of the initial adsorption, respectively. This work achieved the function of removing Cr (VI) by combining the excellent high temperature resistance, acid resistance, and mechanical properties of PI fibers.
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