SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2019
·
IF 2.931
Fanglin Ming,Jingzhou Hou,Changjun Hou,Mei Yang,Xianfeng Wang,Jiawei Li,Danqun Huo,Qiang He
A novel, simple and low-cost nitrogen doped carbon dots (N-CDs) fluorescent sensor for sensitive detection of Cr (VI) was developed via one-step hydrothermal method using thymidine as carbon source. As-prepared N-CDs exhibited the ability of sensitive and selective detection of Cr (VI) through the inner filter effect (IFE). The performances of N-CDs were investigated with the characterization methods of transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Under the optimized conditions, a good logarithm correlation between the fluorescence intensity of N-CD S and the concentration of Cr (VI) was obtained ranging from 0.1 μM to 430 μM (R 2 = 0.992), with a low detection limit (LOD; S/N = 3) of 1.26 nM. The fluorescent sensor showed good repeatability, reproducibility and stability. Furthermore, N-CDs fluorescent sensor had a good applicability for Cr (VI) detection in real water samples with acceptable recoveries, and the detection results were consistent with the inductively coupled plasma mass spectrometry (ICP-MS) results, indicating this fluorescent sensor has a great potential for the environmental monitoring.
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高影响因子
WATER AIR AND SOIL POLLUTION
·
2025
·Vol. 237
·期 6
·331
·
IF 3
Chen Xinyu,Shen Xudong,Hua Yu,Lian Jianjun,Kong Qiaoping,Ye Tianran,Chen Bo,Wang Xinyang
The lignocellulosic biorefinery sector holds significant potential to play a pivotal role in advancing global carbon neutrality goals. However, the efficient utilization of waste lignin remains a critical bottleneck, severely impeding the sustainable development of this industry. This study used a two-step method to prepare zinc and nitrogen activated lignin (Zn/N-lignin), and investigated its removal performance, influencing factors, and potential mechanisms for hexavalent chromium Cr(VI) in water. Results indicated that Cr(VI) removal process conformed to the Langmuir adsorption isotherm model and pseudo-second-order kinetic model. At an initial Cr(VI) concentration of 10 mg·L −1 and an adsorbent dosage of 400 mg·L −1 , the maximum adsorption capacity at 298 K was 284.61 mg·g −1 . Low concentrations (less than 0.1 mmol·L −1 ) of cations Ca 2+ and Mg 2+ , as well as competitive anions H 2 PO 4 − and NO 3 − , have little effect on the removal of Cr(VI). Zn/N-Lignin possessed a good regeneration performance, and the removal efficiency still reached more than 80% after five adsorption and desorption times. Spectral analysis and density functional theory calculations indicated that the main mechanisms of Zn/N-Lignin for removing Cr(VI) from water were electrostatic adsorption, hydrogen bonding and chemical reduction. In order to investigate the environmental impact of the preparation process of Zn/N-Lignin, a life cycle assessment (LCA) was conducted and the contribution of each component to the production of Zn/N-Lignin was analyzed. These results show that Zn/N-Lignin is not only an effective pathway for lignin resource utilization, but also an economically efficient adsorbent for Cr(VI) removal. Graphical
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WATER RESEARCH
·
2025
·
IF 12.4
Huajing Zhou,Kun Wang,Liang He,Zilian Liu,Dianchao Kong,Qiang Zhang,Song Jin,Ying Han,Qingqing Guan,Guoping Sheng
Groundwater remediation presents significant challenges, while microbial electrocatalytic remediation is promising but suffers from low efficiency due to low periplasmic electron transfer. Unlike traditional methods, which involve directly improving the conditions for electron transfer, herein, we first developed an electron-enhanced proton motive force (PMF) strategy for effective Cr(VI) removal. The proton is used as a new mutagenic source to mutate microorganisms by coupling with a micro-electric field. Interestingly, the dominant bacterial species of Rhizobium can directly capture protons (H + ) and electrons from the cathode as energy sources, resulting in greater than 97% reduction and immobilization of Cr(VI) in groundwater. Since the increase in the proton concentration gradient across the cytoplasmic membrane is due to the free diffusion of protons through new proton transfer channels, the extracellular electron transfer (EET) process is accelerated significantly, and Cr(VI) can also shuttle inside the cell to be reduced. 13 C isotope tracer technology and genetic volcano maps were used to further monitor the active transmembrane ETC transport pathway. The accumulated H + transfers electrons through reduced coenzymes, such as glycoside hydrolases (GH3, GH13-40, and GH5-15) and beta-galactosidase (CBM43), establishing a new transmembrane transfer pathway in the periplasmic space. In addition, unlike conventional bioremediation techniques, the proton gradient intensifies the motive force (PMF-H + ) to accelerate the synthesis of adenosine triphosphate, which provides energy for the bioremediation of Cr(VI), leading to a high bioelectrocatalytic rate. The new PMF-H + strategy successfully restored Cr(VI)-contaminated groundwater in situ to meet the water quality standard, indicating great potential for groundwater remediation.
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高影响因子
MOLECULES
·
2017
·Vol. 22
·期 4
·572
·
IF 2.861
Yun Zheng,Zihao Yu,Feng Lin,Fangsong Guo,Khalid A. Alamry,Layla A. Taib,Abdullah M. Asiri,Xinchen Wang
As a promising conjugated polymer, binary carbon nitride has attracted extensive attention as a metal-free and visible-light-responsive photocatalyst in the area of photon-involving purification of water and air. Herein, we report sulfur-doped polymeric carbon nitride microrods that are synthesized through thermal polymerization based on trithiocyanuric acid and melamine (TM) supramolecular aggregates. By tuning the polymerization temperature, a series of sulfur-doped carbon nitride microrods are prepared. The degradation of Rhodamine B (RhB) and the reduction of hexavalent chromium Cr(VI) are selected as probe reactions to evaluate the photocatalytic activities. Results show that increasing pyrolysis temperature leads to a large specific surface area, strong visible-light absorption, and accelerated electron-hole separation. Compared to bulk carbon nitride, the highly porous sulfur-doped carbon nitride microrods fabricated at 650 °C exhibit remarkably higher photocatalytic activity for degradation of RhB and reduction of Cr(VI). This work highlights the importance of self-assembly approach and temperature-control strategy in the synthesis of photoactive materials for environmental remediation.Keywords:carbon nitride;self-assembly;photocatalysis;pollutant degradation;Cr(VI) reduction
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ANALYTICAL CHEMISTRY
·
2015
·
IF 5.636
Juan Wei,Zheng Guo,Xing Chen,Dong-Dong Han,Xiang-Ke Wang,Xing-Jiu Huang
Detection of Cr(VI) by electrochemical methods generally focuses on noble-metal-modified electrodes in strong acid solution using voltammetric techniques. In this work, we report a new strategy to detect Cr(VI) as HCrO4– at pH 5.0 in drinking water using electrochemical impedance spectroscopy. The strategy is based on the high-affinity and specific binding of crown ethers (i.e., azacrown) to HCrO4–, which forms sandwich complexes between them via hydrogen bonds and moiety interactions with K+ captured by azacrown on its self-assembled Au electrode surface. This then blocks the access of redox probes (Fe(CN)63–/4–) to the self-assembled Au electrode, further resulting in an increase in the electron transfer resistance. This method offers a detection limit of 0.0014 ppb Cr(VI) with a sensitivity of 4575.28 kΩ [log c (ppb)]−1 over the linear range of 1–100 ppb (R2 = 0.994) at pH 5.0. In addition, the azacrown self-assembled Au electrode has good selectivity for Cr(VI) with good stability and low interferences. This approach can be performed on spiked Cr(VI) as well as real samples. To the best of our knowledge, this is the first example of electrochemical impedimetric sensing that allows ultrasensitive and ultraselective detection of Cr(VI).
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RSC Advances
·
2024
·Vol. 14
·期 8
·5142-5148
·
IF 3.9
Chunhong Jin,Jingchao Liu,Yilin Yin,Zenghe Li
In wastewater containing heavy metals, Cr(VI) is a potentially toxic metal, mainly derived from production and processing processes such as textile printing, dyeing, ore mining, battery applications, metal cleaning and electroplating. WO3 is widely used in photocatalytic degradation and reduction, and its utilization rate of visible light is high. However, the rapid recombination of photogenerated electron–hole pairs of WO3 limits its use. In this work, the composite material (WxMy) of WO3 and MIL-125 (Ti) was prepared by the ball milling method, and the catalyst was used to photocatalytically reduce Cr(VI). After using W90M10 as a photocatalyst for 50 min, the reduction rate of Cr(VI) can reach 99.2%, and the reduction rate is 2.3 times that of WO3. After 5 cycles of use, the reduction rate can still reach 91.3%. It is mainly due to the formation of a II-type heterojunction between WO3 and MIL-125 (Ti), which promotes the separation of photogenerated electron–hole pairs, thus improving the efficiency of photocatalytic reduction of Cr(VI).
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Shu Chen,Linping Chen,Xiaoqian He,Ruoxi Wu,Chang Peng
Smart adsorbents with responsive self-healing ability will be promising, as they can meet the desirable requirements of sustainable and efficient usage in water treatment. Herein, a photo-induced self-healing gel adsorbent is fabricated by the combination of transition metal carbides Ti 3 C 2 T x (MXene), polyethyleneimine (PEI), and poly(N,N-dimethylacrylamide) (PDMAA) for sustainable and efficient removal of specific target Cr(VI) from water. PEI, as a potent adsorptive motif, endows the gel with high maximum adsorption capacity ( q m ) (i.e., ∼300 mg g −1 for Cr(VI)). Crucially, leveraging the photothermal conversion of Ti 3 C 2 T x and the self-healing repair of PDMAA, the gel is imbued with rapid photo-induced self-healing ability, which facilitates its sustainability in adsorption application. The photoinduction applied to the damaged gel adsorbent enables its rapid self-healing repair, as well as maintains its efficient removal efficiency for reapplication, which makes it more suitable for long-time usage in environments. This work provides a new insight into the application of smart adsorbents for sustainable and efficient adsorption in the field of wastewater treatment.
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CHEMOSPHERE
·
2018
·
IF 4.427
Wei Fang,Xianying Jiang,Hanjin Luo,Junjie Geng
A novel hybrid nanocomposite, polypyrrole nanoparticles (PPy) anchored on the graphene/silica nanosheets with the high specific surface area (polypyrrole-graphene/silica, GS-PPy), was synthesized by a facile in situ polymerization and shows great potential to remove hexavalent chromium [Cr(VI)] in aqueous solutions. Characterizations by XRD , TEM, SEM, BET, FT-IR and XPS, have confirmed that the PPy nanoparticles were well-distributed on the surface of GS nanosheets . The effects of pH, contact time, the concentration of Cr(VI), temperature, coexisting ions and the number of adsorption-desorption cycles were studied. The maximum adsorption capacity of the GS-PPy for Cr(VI) was 429.2 mg g −1 at 298 K at pH 2, which was much higher than PPy nanoparticles and other related materials. The adsorption data fitted to the pseudo-second-order model and Langmuir isotherm model. The removal mechanism involved in electrostatic attraction, ion exchange and reduction process that partial adsorbed Cr(VI) was reduced to Cr(III). And Cr(III) was still retained on the surface of GS-PPy. The GS-PPy nanocomposite will be a potential candidate for the removal of Cr(VI) from the industrial waste water.
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高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2020
·
IF 2.213
Liang Xu,Fenglian Fu,Peijing Yu,Guangzhao Sun
To efficiently treat hexavalent chromium (Cr(VI)) wastewater, K2FeO4 was used to remove and reduce Cr(VI) in presence of Mn(II) in this paper. Batch removal experiments were carried out to study the effect of Fe/Mn molar ratios, initial pH, in-situ and ex-situ and co-existing ions on Cr(VI) removal. The results showed the removal efficiency of Cr(VI) was 97.7% for the initial Cr(VI) concentration of 10.0 mg/L at Fe/Mn molar ratio of 2:3 and initial pH 8.0. Meanwhile, the high removal efficiency of Cr(VI) had been maintained throughout the pH range of 3.0–8.0 in the experimental study. Moreover, the removal process was relatively stable regardless of in-situ and ex-situ, and co-existing ions such as Ca2+ and low concentration of HCO3− had no intense effect on Cr(VI) removal, while SO42− inhibited Cr(VI) removal in the reaction system. To investigate the removal mechanism of Cr(VI) by K2FeO4 in presence of Mn(II), the reaction products were characterized by the Fourier transformed infrared spectrometer, X-ray powder diffraction, Transmission electron microscopy and the high-resolution X-ray photoelectron spectroscopy. The results indicated the ferrate decomposition products of γ-FeOOH/γ-Fe2O3 had the ability to adsorb Cr(VI) and react with Mn(II) to form γ-Fe2O3-Mn(II) complex to adsorb and reduce Cr(VI).
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APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Yulong Xiang,Xinbin Ji,Xiaoli Dong,Yu Wang,Nan Zheng,Jialin Niu,Pei Yu,Chumin Yan
As Cr(VI) pollution intensifies, the development of efficient, eco-friendly, and sustainable treatment technologies has become a vital focus in environmental science. Photocatalytic reduction is often seen as a promising approach for removing Cr(VI), thanks to its low energy requirements and minimal environmental impact. However, traditional photocatalytic materials face significant challenges, including narrow photoresponse range and high rate of electron-hole recombination, which impede their practical efficiency. In this study, we successfully synthesized Fe-DUT-67 photocatalysts by incorporating Fe single atoms into the zirconium-based metal–organic framework (DUT-67) through post-synthetic modification. A significant enhancement in both the visible-light absorption capacity and carrier separation efficiency of the as-prepared Fe-DUT-67 has been observed, attributed to the formation of Fe-O coordination bonds between the Fe atoms and Zr-O clusters. Fe-DUT-67-2 exhibited impressive Cr(VI) reduction activity under full-spectrum illumination, with a remarkable 90% reduction efficiency of Cr(VI) within 18 min. Density functional theory (DFT) calculations shed light on the crucial role of Fe sites in promoting photoelectron transport and facilitating Cr(VI) reduction. This work not only presents an efficient photocatalytic material for alleviating Cr(VI) pollution but also provides a theoretical foundation and design principles for the development of high-performance catalytic systems utilizing single-atom modified metal–organic frameworks.
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高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2026
·
IF 3.3
Xiang Yulong,Ji Xinbin,Dong Xiaoli,Wang Yu,Zheng Nan,Luo Yang,Zhao Honglin,Yan Chumin
Charge separation, transfer, and recombination are crucial factors that influence the efficiency of photocatalytic Cr(VI) reduction. The construction of Schottky junctions can remarkably facilitate the spatial separation of charge carriers. To address the issue of heavy metal pollution in industrial wastewater, an Ag-DUT-67 Schottky junction photocatalyst was synthesized by depositing silver nanoparticles (Ag NPs) onto the DUT-67 surface through a photoreduction technique. The findings indicate that Ag NPs are evenly distributed and coordinated with the sulfur atoms in the DUT-67 ligands. This modification not only elevates the oxygen vacancy content but also broadens the light response range. A Schottky barrier is established at the Ag-DUT-67 interface, which effectively reduces carrier recombination. Notably, Ag-DUT-67–2 demonstrates a remarkable Cr(VI) reduction efficiency of 98% within 30 min, with a reaction rate that is 3.4 times as much as pristine DUT-67. Additionally, Ag-DUT-67–2 shows excellent stability in high-concentration Cr(VI) solutions and in the presence of interfering ions, coupled with good recyclability. This study offers a novel framework of interface engineering and performance enhancement of MOF-based photocatalysts for heavy metal reduction.
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APPLIED CATALYSIS A-GENERAL
·
2026
·
IF 4.8
Linke Zhao,Yang Li,Lili Li,Gongke Wang,Hairui Liu,Hongjing Li,Arif Nawaz,Haifa Zhai
A Z-scheme CIS/rGO/p-CN heterostructure was designed. • CIS/rGO/p-CN exhibits the highest visible-light activity for Cr(VI) photoreduction. • rGO serves as the solid-state electron mediator to switch the charge transfer mode. Hexavalent chromium (Cr (VI)), a highly toxic metal ion readily soluble in aqueous environments, poses significant threats to human health. Herein, a novel Z-scheme CuInS 2 /rGO/protonated g-C 3 N 4 heterostructure was designed with rGO serving as the solid-state electron mediator between CuInS 2 and protonated C 3 N 4 . The samples were systematically characterized using XRD, FTIR, SEM, TEM, XPS, PL, and UV–vis spectroscopy techniques. This flower-like hierarchical structure CuInS 2 /rGO/protonated g-C 3 N 4 exhibits enhanced visible-light photocatalytic activity for Cr (VI) photoreduction. Specifically, it demonstrates a 98% reductive efficiency for Cr (VI) within 20 min at pH= 4 and stable photocatalytic performance. The results indicate that the integration of rGO nanosheets significantly enhances the photocatalytic performance of the CuInS 2 /rGO/protonated g-C 3 N 4 heterostructure by weakening the built-in electric field between CuInS 2 and protonated C 3 N 4 and switching the charge transfer mode from a conventional p-n junction to a Z-scheme mechanism. Download: Download high-res image (103KB) Download: Download full-size image
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