GEOCHIMICA ET COSMOCHIMICA ACTA
·
2019
·
IF 4.258
Guojun Chen,Yanan Bai,Raymond Jianxiong Zeng,Liping Qin
Chromium isotopes are promising for monitoring and quantifying the extent of microbial Cr(VI) reduction. However, the mechanisms and factors that influence Cr isotope fractionation are not well understood. In the present study, we investigated the effects of different metabolic pathways and various environmental parameters on Cr isotope fractionation during Cr(VI) reduction by the extremely thermophilic bacterium Caldicellulosiruptor saccharolyticus . The Cr isotopic compositions were measured on unreacted Cr(VI) in the remaining solution. The reaction product is isotopically lighter than the reactant. The Cr isotope composition for remaining Cr(VI) in the solution followed a Rayleigh fractionation trend and thus became increasingly isotopically heavier as the reduction of Cr(VI) proceeded. Cr(VI) reduction mainly occurs on the cell surface by Ni–Fe hydrogenase; however, in the presence of CuCl 2 , the activity of Ni–Fe hydrogenase was inhibited, and Cr(VI) was reduced inside the cells. We found that despite different Cr(VI) reduction locations, Cr isotope enrichment factors ( ε = ( α − 1) × 1000, where α is the fractionation factor) were identical within uncertainty for experiments with and without CuCl 2 (−2.72 ± 0.67‰ and −2.92 ± 0.14‰, respectively). When added to the cell cultures, neutral red (NR) functioned as an electron carrier that enabled bacteria to drive the electron transfer processes. The ε values were also similar for experiments with and without NR (−2.53 ± 0.40‰ and −2.92 ± 0.14‰, respectively). We compared these ε values to investigate the effects of different electron transport pathways and cellular Cr(VI) transfer processes, including Cr(VI) transport across the cell envelope and binding to reacting enzymes, on Cr isotope fractionation. Furthermore, the effects of various environmental parameters on Cr isotope fractionation were tested, including temperature (50 °C and 70 °C), hydrogen concentration, and different electron donors (glucose and hydrogen). The ε values were similar at both tested temperatures and stayed within the previously observed range for mesophiles ; changes in hydrogen concentration also did not affect the ε values. However, the ε values were slightly higher with hydrogen as the electron donor (−3.64 ± 0.24‰) than those with glucose as the electron donor (−2.92 ± 0.14‰). In short, the Cr enrichment factors remained unchanged despite of changing microbial Cr (VI) reduction pathways and changing temperature conditions, but may be sensitive to the electron donor type.
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ANALYTICAL SCIENCES
·
2017
·Vol. 33
·期 8
·963-967
·
IF 1.228
Sui Ning,Liu Fengya,Li Tailing,Wang Lina,Wang Tao,Liu Manhong,Yu William W.
Au nanoparticles (AuNPs) dispersed in water were stabilized by tripolyphosphate (P 3 O 10 5- ). When Cr 2 O 7 2- (Cr(VI)) was present, the AuNPs did not change; when Cr 3+ (Cr(III)) was present, the AuNPs would aggregate because of cooperative metal-ligand reaction. Aggregated AuNPs showed different color from the non-aggregated ones. Thus, a simple colorimetric assay was made using AuNPs-Cr(VI) to detect ascorbic acid (AA). Upon introducing AA to the AuNPs- Cr(VI) system, Cr(VI) was reduced to Cr(III), and the aggregation of AuNPs occurred. This colorimetric assay performed high selectivity and a linear concentration response in the range of 0.2 to 10 μM; its limit of detection was 0.15 μM.
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Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Dongsheng Xie,Shasha Chu,Shihua Zhang,Andrei Ivanets,Lijuan Zhang,Xintai Su
Electroplating sludge (ES) is a typical industrial hazardous waste , which contains multitudes of valuable transition metal resources. Hence, there is an urgent need for a method which can not only effectively detoxify, but also reasonably reuse ES resources. In this work, we synthesized Cr-doped ferrite catalyst (HT-ES) derived from Cr-containing ES v ia hydrothermal treatment, and applied it for the degradation of tetracycline (TCH). After hydrothermal treatment, the HT-ES with double metal oxide structure and large specific surface area (168.3 m 2 g −1 ) was obtained. The removal percentage of TCH could reach 90.79%, under the optimum conditions derived by response surface methodology . Experimental results demonstrated that HT-ES also exhibited high resistance to water impurities (i.e., Cl - , HCO 3 - , NO 3 and humic acid) and perfect reusability. The electron spin resonance and radical quenching experiments revealed that SO •- 4 , •OH and O •- 2 radicals appeared in the TCH degradation reaction system. Finally, a probable degradation mechanism of TCH was proposed based on the experimental results. This work not only achieved the stabilization of Cr-containing ES, but also obtained an excellent catalyst for the removal of TCH, realizing the goal of treating waste with waste.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Linqing Liang,Jiahong Wang,Yanxin Zhang
In this study, H 2 O 2 oxidized magnetic mesoporous carbon hollow microspheres (Fe 3 O 4 @void@C@H 2 O 2 ) with core-shell structure, high magnetic properties and abundant oxygen-containing functional groups was synthesized for removal of Cr(III)-EDTA and Cr(III) in high salinity wastewater. Fe 3 O 4 @void@C@H 2 O 2 was synthesized at optimum conditions of H 2 O 2 concentration of 20%, oxidation temperature of 40 °C and oxidation time of 4 h, and the determined adsorption amount of Cr(III)-EDTA and Cr(III) on the adsorbent was 9.72 and 10.53 mg g −1 at pH 4.0 and 25 °C, respectively. Adsorption behavior of Cr(III)-EDTA could be better described by Langmuir isotherm and Cr(III) adsorption followed Freundlich isotherm. Cr(III)-EDTA and Cr(III) adsorption on the adsorbent followed pseudo-second-order kinetics, and adsorption rate of Cr(III) adsorption on the adsorbent is higher than that of Cr(III)-EDTA. Fe 3 O 4 @void@C@H 2 O 2 showed strong affinity for Cr(III) and Cr(III)-EDTA even in high salinity water. Moreover, Fe 3 O 4 @void@C@H 2 O 2 exhibited the high stability in acid solution and Cr(III) saturated adsorbent can be easily regenerated in 0.1 mol L −1 HCl. Cr(III)-EDTA adsorption was described to the surface complexation between the oxygen-containing groups (such as hydroxyl, carbonyl and carboxyl groups) of the adsorbent and Cr(III) in Cr(III)-EDTA, and the hydrogen bonding between oxygen-containing groups of the adsorbent and EDTA of Cr(III)-EDTA, while Cr(III) adsorption on the adsorbent was surface complexation and ion exchange. The results highlighted that Fe 3 O 4 @void@C@H 2 O 2 have great potentials for adsorptive removal of Cr(III) and it's chelate from the high salinity wastewater.
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JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Zhiyan Yan,Chenrui Liu,Yun Liu,Xiaoqian Tan,Xinyue Li,Yan Shi,Chunlian Ding
Cr(VI) contaminated water usually contains other contaminants like engineered nanomaterials (ENMs). During the process of microbial treatment , the inevitable interaction of Cr(VI), ENMs, and microorganisms probably determines the efficiency of Cr(VI) biotransformation , however, the corresponding information remains elusive. This study investigated the interaction of ZnO nanoparticles (NPs), Cr(VI), and Pannonibacter phragmitetu s BB (hereafter BB), which changed the process of microbial Cr(VI) reduction. ZnO NPs inhibited Cr(VI) reduction, but had no effect on bacterial viability. In particular, Cr(VI) induced BB to produce organic acids and to drive Zn 2+ dissolution from ZnO NPs inside and outside of cells. The dissolved Zn 2+ not only promoted Cr(VI) reduction to Cr(V)/Cr(IV) by strengthening sugar metabolism and inducing increase in NAD(P)H production, but also hindered Cr(V)/Cr(IV) transformation to Cr(III) through down-regulating Cr(VI) reductase genes. A novel bacterial driven ROS scavenging mechanism leading to the inhibition of Cr(VI) reduction was elucidated. Specifically, the accumulated Cr(VI) and Cr(V)/Cr(IV) formed a redox dynamic equilibrium, which triggered the disproportionation of superoxide radicals mimicking superoxide dismutase through the flip-flop of Cr(VI) and Cr(V)/Cr(IV) in bacterial cells. This study provided a realistic insight into design the applicability of biological remediation technology for Cr(VI) contaminant and evaluating environmental risks of ENMs.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2024
·
IF 8.2
Guang Tian,Falin He,Xiangxiang Li,Shaoyang Hu,Xingchen Zhao,Shuqi Guo,Tingting Wang,Hao Wang,Wansong Zong,Rutao Liu
Chromium (Cr) poses a high ecological risk, however the toxic mechanisms of Cr in different valence states to soil organisms at cellular and molecular levels are not exactly. In this study, the Eisenia fetida coelomocytes and Cu/Zn-superoxide dismutase (Cu/Zn-SOD) were chosen as the target subjects to investigate the effects and mechanisms of cellular toxicity induced by Cr(VI) and Cr(III). Results indicated that Cr(VI) and Cr(III) significantly reduced the coelomocytes viability. The level of reactive oxygen species (ROS) was markedly increased after Cr(VI) exposure, which finally reduced antioxidant defense abilities, and induced lipid peroxidation and cellular membrane damage in earthworm coelomocytes. However, Cr(III) induced lower levels of oxidative stress and cellular damage with respect to Cr(VI). From a molecular perspective, the binding of both Cr(VI) and Cr(III) with Cu/Zn-SOD resulted in protein backbone loosening and reduced β-Sheet content. The Cu/Zn-SOD showed fluorescence enhancement with Cr(III), whereas Cr(VI) had no obvious effect. The activity of Cu/Zn-SOD continued to decrease with the exposure of Cr. Molecular docking indicated that Cr(III) interacted more readily with the active center of Cu/Zn-SOD. Our results illustrate that oxidative stress induced by Cr(VI) and Cr(III) plays an important role in the cytotoxic differences of Eisenia fetida coelomocytes and the binding of Cr with Cu/Zn-SOD can also affect the normal structures and functions of antioxidant defense-associated protein.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Xiao Dan Sun,Zhangxin Duan,Jingjing Song,Hanxing Yang,Kai Yan,Zhenhua Tian,Dangge Gao,Jianzhong Ma
Carcinogen Cr(VI) is reduced efficiently into Cr(III) by a photocatalyst, but the produced Cr(III) is difficult to transfer from the photocatalytic active site. The “two birds with one stone” strategy is proposed to realize the in situ growth of ZnIn2S4 nanoplates on SBA-15 and the creation of separated active sites, in which ZnO loading on the porous SBA-15 nanorod was used as a zinc source. Obtained samples ZnIn2S4/SBA-15 (ZIS/SBA) showed the redshift of the absorption band and better separation of photoinduced carriers than pristine ZnIn2S4, due to its smaller size and S defect. All of the Cr(VI) was reduced to Cr(III) by the ZIS/SBA sample during the photocatalytic process, which was 2 times higher than pristine ZnIn2S4. Moreover, 92.8% of Cr(III) was adsorbed simultaneously during photocatalysis due to the electrostatic interaction from SBA-15. In addition, the ZIS/SBA sample showed good recycling stability after 5 times cycles, providing a new strategy for the in situ growth of ZnIn2S4 on the surface of porous materials and a novel way for the simultaneous removal of Cr(VI) and Cr(III) during photocatalysis.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Yilin Le,Xing He,Mengnan Liu,Xue Liu,Shidong Zhou,Rongrong Xie,Yu Fu,Huilei Wang,Jianzhong Sun
Hexavalent chromium (Cr(VI)) contaminated in soil or water system poses a serious threat to human health. Developing an efficient remediation strategy and treatment method towards Cr(VI) in situ from wastewater is truly under an urgent demand in many countries or regions suffered from this heavy metal threaten. Converting Cr(VI) to Cr(III) with less toxicity by a biological or photocatalytic reduction processing is commonly considered as one of the effective strategies. However, how to effectively enhance the performance of Cr(VI) reduction processing remains a technical challenge. In line with this issue, a novel approach has been proposed to combine a biological and photocatalytic reduction processing together to improve the Cr(VI) remediation. In this system, a novel Cr(VI)-reducing anaerobic bacterium Paraclostridium bifermentans G3 isolated from termite’s gut would detoxify Cd(II) to cadmium sulfide (CdS) nanoparticles that could be precipitated in situ on the cell surface to create a CdS- Paraclostridium bifermentans complex. More importantly, with this complex system, the Cr(VI) reduction processing was significantly improved, where Cr(VI) was completely reduced by the complexes in the case of Cr(VI) concentration at 260 mg/L after 90 min under light culture. As a comparison, if the biological agent, P. bifermentans, was applied alone, it would come out a different reduction efficiency at 81.9% of Cr(VI) after 90 min reaction. These results suggested that the proposed complex system of Cr(VI)-reducing bacteria combined with CdS nanoparticles may potentially provide a novel and in-situ approach for a sustainable enhancement of Cr(VI) remediation to wastewater.
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JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Cuili Xing,Xinyi Yao,Kaiwei Zheng,Yang Liu,Yuankui Sun,Xiaohong Guan
Efficient removal of recalcitrant Cr(III)-organic complexes is always challenged by slow decomplexation process and the possible accumulation of highly toxic Cr(VI). Herein, a sulfidated zero-valent iron coupled ozonation strategy (S-ZVI/O 3 ) was proposed to achieve efficient decomplexation and simultaneous abatement of Cr(III)-EDTA without Cr(VI) accumulation. Results revealed that S-ZVI could catalyze O 3 to enhance removal of Cr(III)-EDTA and total organic carbon. Moreover, 88.3 % of total Cr was sequestrated by S-ZVI/O 3 and the corresponding kinetic constant was 3.1 times higher than that of ZVI/O 3 . Mechanistically, electron paramagnetic resonance and probing tests verified HO • was the dominant reactive oxidation species for decomplexation of Cr(III)-EDTA in both S-ZVI/O 3 and ZVI/O 3 . More attractively, it was found that structural Fe(II) was the major O 3 activator in S-ZVI/O 3 , whereas dissolved Fe 2+ accounted for O 3 catalyzation in ZVI/O 3 . The X-ray absorption spectroscopy analysis revealed that sulfidation treatment could enhance corrosion of ZVI with the formation of sufficient Fe(II) species. The in-situ formed Fe(II) could not only transform undesired Cr(VI) back to Cr(III) but also co-precipitate with Cr(III) to form solid Fe-Cr hydroxides. Besides Cr(III)-EDTA, S-ZVI/O 3 is also applicable to other EDTA complexed heavy metals. This work would provide a new method for the heavy metal complexes removal from water.
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Light-Science & Applications
·
2026
·Vol. 15
·期 1
·200
·
IF 24
Fang Ziyi,Pan Xiaofeng,Zhang Qi’an,Wu Mingzhi,Liu Yang,Ma Qidong,Ren Biyun,Wang Yanze,Liu Shengqiang,Zulfiqar Maryam,Ju Ming-Gang,Gan Jiulin,Li Leipeng,Wang Feng,Peng Dengfeng
Materials exhibiting mechanoluminescence (ML) that directly convert mechanical stimuli into light hold significant potential for real-time stress sensing and intelligent photonic systems. However, most high-performance ML systems rely on complex multicomponent compounds that often suffer from limited intensity, stability, and scalability, largely due to poorly understood mechanisms. Herein, we report a simple Al 2 O 3 :Cr 3+ oxide that exhibits unprecedented ML intensity, enabled by a well-defined mechanical-to-optical energy conversion process. The self-recoverable ML arises from stress-induced ionization of electrons from luminescence centers, followed by their recapture upon stress release. By precisely tuning the doping levels, annealing conditions, and heterojunction interfaces, Al 2 O 3 :Cr 3+ phosphors achieved intense, reproducible, and thermally stable near-infrared emission. Notably, high-temperature annealing dramatically enhanced the ML intensity, with thermodynamic and kinetic analyses revealing increases in the carrier and defect concentrations by several orders of magnitude, accounting for the exceptional brightness. By leveraging the chemical robustness, abundance, and low cost of alumina, we demonstrated the flexible ML paper for stress visualization and multi-level anti-counterfeiting, as well as in-situ grown Al 2 O 3 :Cr 3+ luminescent layers on Cr–Al alloys for passive, real-time stress monitoring. This study establishes Al 2 O 3 as a durable and scalable oxide platform for next-generation self-recoverable ML materials, bridging fundamental research and practical sensing technologies.
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高影响因子
MOLECULES
·
2024
·Vol. 29
·期 22
·5459
·
IF 4.2
Hao Peng,Zonghui Qin,Guixuan Jin,Jingjing Wang,Jielin Qin,Lihua Ao,Bing Li
In this paper, tartaric acid (C4H6O6) was used as a reductant to treat chromium (VI)-containing solution. Several independent experimental parameters, including reaction temperature, concentration of H2SO4, concentration of C4H6O6and reaction time, on the reduction process were studied. The results showed that 100% of the Cr (VI) could be reduced by C4H6O6in a strong acidic environment under a high reaction temperature. All of the experimental parameters showed positive effects on the reduction process and followed the order [H2SO4] > [C4H6O6] > reaction temperature > reaction time. A higher concentration of tartaric acid and higher reaction temperature could facilitate the reduction process and reduce reaction time.
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CHEMISTRY LETTERS
·
2020
·Vol. 49
·期 11
·1421-1425
·
IF 1.361
Wang Shaohua,Zhang Hanying,Li Hao,Wu Ruijie,Hua Zhongqiu,Wu Yi,Tian Xuemin
WO3 nanosheets were synthesized by an acidification method and Cr was loaded on the surface of nanosheets via an impregnation procedure. The morphologies of pristine and Cr-loaded WO3 nanosheets were analyzed. Gas sensors based on pristine and Cr-loaded WO3 nanosheets were fabricated by a screen-printing technique and their sensing properties were also investigated. It was found that the catalytic modification of Cr can significantly improve the sensing performance of WO3 nanosheets to ammonia. In addition, the sensitization mechanism of Cr-loaded WO3 could be caused by the electrical sensitization effect and more stable product in the sensing processes to ammonia.
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