AQUATIC TOXICOLOGY
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2015
·
IF 3.451
Hongxing Chen,Jinling Cao,Lixia Li,Xing Wu,Ran Bi,Paul L. Klerks,Lingtian Xie
Maternal transfer of metals can be an important exposure route for animals. The maternal transfer of Cr and its effects on reproduction in fish are still largely unknown. In this study, Japanese medaka were exposed to a sublethal Cr(VI) concentration for 6 days (acute) and for 3 months (chronic). Chromium accumulation in the gonads, maternal transfer of Cr, and effects of Cr on the reproduction, histopathology and expressions of antioxidants in the gonads were evaluated. Both acute and chronic exposures resulted in significant Cr accumulation in gonads, eggs and larvae. In chronic Cr-exposed fish, approximately 61% of the Cr accumulated in the ovary was depurated by spawning during the first 3 days after exposure, suggesting that maternal transfer is a very important pathway for accumulation in offspring. The chronic exposure caused decreases in body weight, standard length, gonad weight, gonad-somatic index (GSI) and fecundity. The last of these was most severely affected: the total number of broods and eggs per female decreased by 57.1% and 75.9%, respectively. Moreover, egg weight and fertilization rate were also reduced (by approximately 20%) following chronic Cr(VI) exposure. Histopathological analyses showed that the Cr exposure resulted in the onset of follicular atresia and a reduction in the number of mature oocytes, along with a reduction in abundance of mature spermatozoa in testes. The GSH/GSSG ratio was greatly elevated after chronic Cr(VI) exposure, implying that GSH played a role in scavenging the reactive oxygen species generated by the reduction of Cr(VI) inside cells. This study provides evidence for the maternal transfer of Cr, highlights the importance of spawning in Cr depuration from the ovary, and demonstrates that chronic Cr(VI) exposure has serious impacts on reproduction in the Japanese medaka. Our results suggest that the issue of chronic Cr pollution deserves more attention than it has received to date.
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高影响因子
Nanoscale
·
2025
·
IF 5.1
Wei Zhao,Yuxiang Yang,Yanbin Li,Yimin Liu,Yuezhou Wei,Xinpeng Wang,Deqian Zeng
The advancement of efficient photocatalysts is essential for tackling global energy and environmental issues. In this work, a unique sheet-on-sheet Cd(OH)2/CdS photocatalyst was synthesized via a facile solution strategy, demonstrating significantly improved photocatalytic performance for H2 generation and Cr(VI) reduction. The optimal 5% Cd(OH)2/CdS obtained an impressive H2 production rate of 3475 μmol·g-1·h-1 under visible light, marking a 6.3 times increase compared to CdS. Additionally, the kinetics of Cr(VI) reduction were markedly accelerated, with a rate constant of 0.2803 min-1, representing a 5.7 times improvement over pure CdS. Moreover, the 2D/2D Cd(OH)2/CdS photocatalyst exhibited exceptional stability, maintaining high photocatalytic activity over multiple reaction cycles. Experimental findings and DFT calculations revealed the charge transfer mechanism between CdS nanosheets and Cd(OH)2 cocatalyst. This work provides insights into designing high-performance CdS-based nanophotocatalysts for water splitting and environmental remediation.
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PubMed
高影响因子
TALANTA
·
2016
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IF 4.035
Guobin Han,Qiaoling Zeng,Zhongwei Jiang,Tiantian Xing,Chengzhi Huang,Yuanfang Li
Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS) has been proven as a useful and advanced technique in the identification of polymers and proteins. However, MALDI-TOF-MS still has the unavoidable drawback of self-signal interference with traditional organic matrices, which could suppress and overlap with the analyte signals in the low-mass region. In this work, MIL-101(Cr), a kind of metal-organic frameworks which possess high molecular weight , π-conjugated 3-D structure, coordinately unsaturated chromium sites (CUS) and strong absorption in the UV range, was employed to replace traditional organic matrices, and it was found that MIL-101(Cr) can dramatically eliminate the background peaks, showing high signal-to-noise level in the analysis of small molecules. As proof-of-concept, quercetin , daidzein , genistein and naringenin , members of flavonol family which widely exists in food and natural products , were successfully determined by utilizing MIL-101(Cr) as the surface-assisted matrix, and the detection of quercetin was sensitive with good salt tolerance and reproducibility. Under optimal conditions, the mass peak intensity exhibited good linear relationships in the range from 0.25 µg/mL-7.00 µg/mL for quercetin ( R 2 =0.996) with detection limit 2.11 ng/mL (3σ/k), making the identification of quercetin in sophora japonica successfully. With this strategy we have demonstrated the potentiality of MIL-101(Cr) nanomaterials as MALDI-MS matrix for the detection of small molecules.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yangshuo Sun,Guiyang Jiang,Yiming Zhou,Leilin Shu,Jiarui Li,Longcheng Liu,Junzhe Zhang,Xunrui Cheng,Yiyun Liu,Xiaoyan Xu,Zhi Zhu,Junshan Liu,Jing Zhang,Bo Sheng,Zhengyan Wu
This study successfully employed an electric field-driven physical technique to load nanoscale zero-valent iron (NZVI) onto a polyvinylidene fluoride (PVDF) membrane, resulting in a highly dispersed and stable NZVI-PVDF composite membrane (ENP). This method avoids the generation of toxic substances and significantly suppresses NZVI aggregation and oxidation, making it highly effective for the reduction of Cr(VI) in wastewater. SEM and AFM analyses revealed that, compared to conventional loading methods, this technique effectively reduces NZVI agglomeration. The resulting NZVI particles have an average diameter of 17.29 nm, while the root mean square roughness (Sq) of the membrane surface is 127.338 nm, ensuring a higher availability of Cr(VI) reduction-active sites. Moreover, after NZVI loading, the surface contact angle of the PVDF membrane decreased from 77.4° to 63.1°, indicating enhanced hydrophilicity. Cr(VI) reduction experimental results indicate that under optimal conditions with an applied voltage of 6 kV, pH 2, temperature of 25 °C, and atmospheric pressure, the ENP membrane achieved a Cr(VI) removal efficiency of 99.8 % within 1 h for an initial Cr(VI) concentration of 100 mg/L. These findings demonstrate that the electric field-driven NZVI loading approach will provide a promising, cost-effective, and environmentally friendly strategy for industrial wastewater treatment. It effectively overcomes the issue of NZVI aggregation while expanding its practical applications in water treatment technologies.
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高影响因子
MICROCHEMICAL JOURNAL
·
2025
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IF 5.1
Jing Meng,Moustafa Zahran,Ahmed S. Abou-Elyazed,Xiaolin Li
Herein, we report a novel electrochemical sensor for determining glucose in sweat, employing a graphene/metal–organic framework (MOF) as a modifier for stainless steel (SS) electrode. The MOF structures, MIL-101(Cr), MIL-101(Cr)-NO 2 , and MIL-101(Cr)-NH 2 , were hydrothermally synthesized and then characterized using X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, N 2 adsorption/desorption isotherms, and scanning electron microscopy (SEM). XRD and SEM results proved the formation of the crystalline MIL-101(Cr) and MIL-101(Cr)-NO 2 , and the amorphous MIL-101(Cr)-NH 2 . Additionally, FT-IR and isotherms confirmed their composition and mesoporosity, respectively. The amorphous MIL-101(Cr)-NH 2 showed the best electrocatalytic activity towards glucose oxidation among the fabricated MOFs. The electrocatalytic activity was also boosted after incorporating conductive graphene. Under optimized conditions, graphene/MIL-101(Cr)-NH 2 /SS was used for glucose determination using square wave voltammetry and chronoamperometry with detection limits of 0.004 and 0.01 mM, respectively. Moreover, the modified electrode showed acceptable recovery values when it was applied to detect glucose in artificial sweat samples.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 43
·20280-20288
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IF 3.591
Shengli Zhang,Yanbo Pei,Menglin Li,Wei Li,Kai Su,Junmin Chen,Hongwei Yang
In the present study, a functionalized carboxymethyl cellulose-based adsorbent (PEI–PAM–CMC) was prepared via linking polyethyleneimine and polyacrylamide with carboxymethyl cellulose by epichlorohydrin. It possessed a sponge-like structure with a large number of micron-sized pores, which facilitated the mass transfer of Cr(VI). Under neutral conditions, Cr(VI) can be efficiently removed by the protonated PEI–PAM–CMC. The residual levels in the effluent were below 0.5 and 0.05 mg L−1 for 10 and 1 mg L−1 of Cr(VI), respectively. The adsorption data fitted well with the pseudo-second order kinetic model and Langmuir isotherm. Common ions including Cl−, H2PO4−, NO3−, K+, Na+, Ca2+, Mg2+ and Cr3+ had neglectable influence for Cr(VI) adsorption on the PEI–PAM–CMC except SO42−. Meanwhile, PEI–PAM–CMC showed good regeneration and reusability with a 7.5% decrease in the removal rate after ten adsorption/desorption cycles. XPS analysis and DFT calculation revealed that Cr(VI) uptake by the PEI–PAM–CMC was involved in electrostatic attraction and chemical binding. Electrostatics and induction were the main weak interaction between Cr(VI) and the adsorbent, and the major chemical adsorption sites were mainly distributed in the nitrogen groups. This research not only developed an efficient material for Cr(VI) removal but also provided a promising insight into an adsorption mechanism study.
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高影响因子
Open Chemistry
·
2020
·Vol. 18
·期 1
·97-107
·
IF 1.216
Huayu Huang,Yang Wang,Yubin Zhang,Zhiying Niu,Xinli Li
Amino-functionalized graphene oxide (GO-NH 2 ) was synthesized by grafting (3-aminopropyl) triethoxysilane on the graphene oxide (GO) surface. The GO-NH 2 with high surface area and numerous active sites can efficiently adsorb Cr(VI), Cu(II), Pb(II) and Cd(II) ions. The maximum adsorption capacities of GO-NH 2 for Cr(VI), Cu(II), Pb(II) and Cd(II) were 280.11, 26.25, 71.89 and 10.04 mg g −1 , respectively. The pseudo-first-order and pseudo-second-order kinetic models were employed to describe the kinetic processes. The experimental data agreed well with the pseudo-second-order kinetic equation, and the adsorption of heavy metals onto GO-NH 2 occurs via chemical adsorption. The characteristics of Cr(VI), Cu(II), Pb(II) and Cd(II) in the GO-NH 2 adsorption processes were analyzed using the Langmuir and Freundlich isotherm models. The adsorption processes of Pb(II) and Cd(II) on GO-NH 2 were fit by the Langmuir model. The Freundlich isotherm model was well correlated to Cr(VI) and Cu(II). The GO-NH 2 is a promising material for the removal of heavy metal ions from industrial wastewater. This study provides an effective pathway to process industrial wastewater, and the GO-NH 2 has a good adsorption effect for the treatment of heavy metals in industrial wastewater.
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高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 10
·2580
·
IF 5.076
Jien Ye,Yating Luo,Jiacong Sun,Jiyan Shi
The aggregation of nanoscale zero-valent iron (nZVI) particles and their limited transport ability in environmental media hinder their application in environmental remediation. In this study, the Cr(VI) removal efficiency, transport performance, and toxicity of nZVI and bentonite-modified nZVI (B-nZVI) were investigated. Compared with nZVI, B-nZVI improved the removal efficiency of Cr(VI) by 10%, and also significantly increased the transport in quartz sand and soil. Increasing the flow rate can enhance the transport of nZVI and B-nZVI in the quartz sand columns. The transport of the two materials in different soils was negatively correlated with the clay composition. Besides, modification of nZVI by bentonite could reduce toxicity to luminous bacteria (Photobacterium phosphereumT3) and ryegrass (Lolium perenneL.). Compared with Fe-EDTA, the transfer factors of nZVI and B-nZVI were 65.0% and 66.4% lower, respectively. This indicated that although iron nanoparticles accumulated in the roots of ryegrass, they were difficult to be transported to the shoots. The results of this study indicate that B-nZVI has a strong application potential in in situ environmental remediation.Keywords:nanoscale zerovalent iron (nZVI);hexavalent chromium;bentonite;toxicity
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高影响因子
Journal of Environmental Chemical Engineering
·
2020
·
IF 4.3
Wei Jiahao,Cai Weiquan
Carbon microspheres have attracted considerable interest in the field of heavy metal wastewater treatment. Herein, waste peanut hull derived N-doped spherical carbons (WPHSC) were successfully prepared by a one-step mild hydrothermal method. The obtained samples were characterized by XRD, SEM, FT-IR and XPS. The adsorption tests indicated that the WPHSC show excellent adsorption performance for Cr(VI) with the maximum adsorption capacity of 181.82 mg g −1 . While treating the real electroplating wastewater with a WPHSC dosage of 4 g L −1 , the Cr concentration significantly decreased from 652.96 mg L −1 to 113.42 mg L −1 . The adsorption mechanism attributes to the electrostatic attraction and redox reaction between Cr(VI) and WPHSC. Importantly, this method can be extended to other waste plant biomass, including sunflower seed hulls, walnut shell, coconut shell and corncob as carbon sources. The adsorption removal efficiencies of the obtained carbon spheres for 100 mg L -1 Cr(VI) are all over 99.5 % with low residual concentrations less than 0.5 mg L −1 . This universal study expands the scope of renewable raw materials for preparing carbon spheres with great application potential in the field of chromium-containing wastewater treatment.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Siqi Wang,Qinglu Zhou,Xue Han,Mengning Wang,Xuerui Liu,Qun Jiang,Tianqi Liu,Jianhua Qu,Ying Zhang
Hexavalent chromium (Cr(VI)), with its high mobility and acute toxicity, seriously threatens both soil integrity and human health. Herein, we propose a material design strategy to enhance Cr(VI) detoxification by loading sulfur-modified nanoscale zero-valent iron onto phosphorus-modified biochar (S-nZVI@PBC), attaining highly efficient remediation of Cr residues in contaminated sites. Characterization results demonstrated that S modification and PBC loading effectively prevent oxidation and aggregation of primitive nZVI, thereby enhancing electron transfer and reactivity of the material. Compared to traditional nZVI, S-nZVI@PBC exhibited a 2.4 times enhancement in Cr(VI) reduction efficiency and 1.12 times improvement in electron utilization efficiency, achieving an optimal adsorption capacity of 352.44 mg/g within 60 min. After 28 d of remediation, soil Cr(VI) content decreased significantly from 2000 to 361.03 mg/kg, while the TCLP leachate concentration of Cr was reduced from 2000 to 178.71 mg/kg, effectively mitigating the biotoxicity of Cr(VI). Furthermore, S-nZVI@PBC exhibited excellent reactivity and mobility, the effect of remediation achieved nearly 100 % Cr(VI) removal in topsoil within 1 d and reduced the deep soil concentrations by 1164.70 mg/kg after 21 d, while effectively transforming exchangeable Cr into immobilized Fe/Mn oxide-bound species. The remediation mechanism of S-nZVI@PBC in Cr(VI)-contaminated soils predominantly decreased Cr bioavailability via adsorption, reduction, and co-precipitation pathways. Collectively, this study presents a highly effective nZVI modification strategy, providing theoretical and technical support for effective site remediation.
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高影响因子
ACS Applied Optical Materials
·
2025
·
IF 3.8
Lipeng Huang,Yanjie Liang,Xulong Lv,Xihui Shan,Yi Zhang,Xiao-Jun Wang
Short-wave infrared (SWIR) light sources, as crucial components of SWIR imaging and spectroscopy technologies, have garnered significant attention recently. The rapid development of portable electronic devices has created a demand for compact and efficient SWIR emitters, and phosphor-converted SWIR LEDs represent the optimal technological solution to meet this requirement. Here, a Cr(PO3)3:Yb3+ phosphor with highly efficient and pure SWIR luminescence under 450 nm blue LED excitation is reported. Upon doping with Yb3+ in the Cr(PO3)3 matrix, the resulting material is capable of effectively converting blue excitation photons to SWIR luminescence spanning from 900 to 1200 nm, with a dominant emission peak at 1003 nm due to the efficient energy transfer from Cr3+ to Yb3+. Notably, this phosphor demonstrates an ultrahigh internal quantum efficiency (IQE) of 95.7% and a record external quantum efficiency (EQE) of 60.3% upon 450 nm blue light excitation. Moreover, the fabricated SWIR LED prototype device by combining the Cr(PO3)3:Yb3+ phosphor and a commercial 450 nm blue LED chip exhibits SWIR output power of 24.1 mW at 200 mA input current and a photoelectric conversion efficiency of 12.8% at 20 mA. This study not only opens avenues for realizing high-efficiency SWIR luminescence by deliberately controlling energy transfer pathways in Cr-based material systems but also paves the way for the development of high-power SWIR light sources.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xiaolu Fan,Tianyun Wu,Xue Wu,Bo Jiang,Jing Xiong,Fei Li,Shupeng Li,Lei Zheng,Yunpeng Liu,Dayi Zhang
Chemical stabilization is a frequently used method to stabilize heavy metals in soils, however suffering from the reagent overdosage and exorbitant cost due to the insufficient reactions between chemical stabilizers and heavy metals. In this work, we innovated an economy and energy efficient stabilization technique, namely steam flash heating (SFH), and investigated its stabilization performance and mechanisms for hexavalent chromium [Cr(VI)]. SFH can efficiently promote Cr(VI) reduction by both soil organic matter and chemical stabilizers. From thermophysical analysis, SFH efficiently enhanced the molecular contact and accelerated mass transfer in porous soils, resulting in the promoted transformation of Cr(VI) into OM-Cr(III), Fh-Cr(III), and Cr(OH) 3 from Cr/Fe/S/C XANES results. By replacing partial chemical stabilizers with soil organic matter in Cr(VI) reduction, SFH decreased nearly 70.7% of cost and 38.1% of CO 2 emission. Besides, Mn XANES results unraveled that MnO x was reduced by soil organic matter and chemical stabilizers with the aid of SFH, and this process decreased the risk of Cr(III) re-oxidation and benefited long-term Cr stability. These results proved that SFH could efficiently immobilize Cr with low energy consumption, low economic cost, high stabilizer efficiency, and low re-mobility risk, exhibiting applicable potential in the remediation of Cr-contaminated soils. This study revolutionized chemical stabilization by SFH and unraveled the underlying mechanisms of Cr immobilization in contaminated soils.
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