INORGANIC CHEMISTRY COMMUNICATIONS
·
2024
·
IF 4.4
Hanlu Fang,Mengying Lü,Taohai Li,Feng Li
Heavy metal contamination is a grave environmental concern due to its severe implications for human health and ecosystems, causing carcinogenic and teratogenic effects. This study addresses this pressing issue by exploring the synthesis and application of CdS/SbVO 4 composites as effective photocatalysts. These composites were synthesized by a streamlined two-step hydrothermal method, with investigations conducted on varying molar ratios. The composite with a molar ratio of 0.2:1 demonstrated superior Cr(VI) photoreduction properties under visible light irradiation, exhibiting an efficiency quadruple that of pure SbVO 4 . This enhancement in photocatalytic activity is credited to the augmented separation of electrons and holes facilitated by the integration of narrow band gap materials within the composite. Electrochemical tests indicated the electron transfer mechanism and identified the primary active centers of the samples. The detailed photocatalytic mechanism of the composite was further discussed, grounded on insights derived from free radical trapping experiments and electron spin resonance analyses.
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高影响因子
BIORESOURCE TECHNOLOGY
·
2024
·
IF 9.7
Li Chen,Zhigang Yi,Yaoning Chen,Yuanping Li,Hongjuan Jiang,Jun Wang,Yanrong Chen,Yaoqin Nie,Mengwei Luo,Qianruyu Wang,Wei Zhang,Yanting Wu
The current research studied how Fe 3 O 4 nanomaterials (NMs) and CaO 2 affect humification and Cr(VI) immobilization and reduction during the composting of oil-tea Camellia meal and Cr-contaminated soil. The results showed that Fe 3 O 4 NMs and CaO 2 successfully construct a Fenton-like reaction in this system. The excitation-emission matrix-parallel factor (EEM-PARAFAC) demonstrated that this Fenton-like treatment increased the generation of humic acids and accelerated the humification. Meantime, RES-Cr increased by 5.91 % and Cr(VI) decreased by 16.36 % in the treatment group with CaO 2 and Fe 3 O 4 NMs after 60 days. Moreover, the microbial results showed that Fe 3 O 4 NMs and CaO 2 could promote the enrichment of Cr(VI) reducing bacteria, e.g., Bacillus , Pseudomonas , and Psychrobacter , and promote Cr(VI) reduction. This study gives a novel view and theoretical reference to remediate Cr(VI) pollution through composting.
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PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2024
·
IF 8.2
Jie Zhou,Xin Zheng,Chen Xi,Xinyi Tang,Yinjie Jiang,Minjuan Xie,Xiaoyi Fu
Hexavalent chromium [Cr(VI)] is a highly hazardous heavy metal with multiple toxic effects. Occupational studies indicate that its accumulation in humans can lead to liver damage. However, the exact mechanism underlying Cr(VI)-induced hepatotoxicity remains unknown. In this study, we explored the role of CTH/H 2 S/Drp1 pathway in Cr(VI)-induced oxidative stress, mitochondrial dysfunction, apoptosis, and liver injury. Our data showed that Cr(VI) triggered apoptosis, accompanied by H 2 S reduction, reactive oxygen species (ROS) accumulation, and mitochondrial dysfunction in both AML12 cells and mouse livers. Moreover, Cr(VI) reduced cystathionine γ-lyase (CTH) and dynamin related protein 1 (Drp1) S-sulfhydration levels, and elevated Drp1 phosphorylation levels at Serine 616, which promoted Drp1 mitochondrial translocation and Drp1-voltage-dependent anion channel 1 (VDAC1) interactions, ultimately leading to mitochondria-dependent apoptosis. Elevated hydrogen sulfide (H 2 S) levels eliminated Drp1 phosphorylation at Serine 616 by increasing Drp1 S-sulfhydration, thereby preventing Cr(VI)-induced Drp1-VDAC1 interaction and hepatotoxicity. These findings indicated that Cr(VI) induced mitochondrial apoptosis and hepatotoxicity by inhibiting CTH/H 2 S/Drp1 pathway and that targeting either CTH/H 2 S pathway or Drp1 S-sulfhydration could serve as a potential therapy for Cr(VI)-induced liver injury.
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高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2025
·
IF 5.4
Guangyu Xu,Han Chen,Jingjing Cai,Baowei Hu,Linfa Bao
The contamination of heavy metals and antibiotics represents one of the most serious environmental issues. In this study, the synergistic removal of chromium (Cr(VI)) and tetracycline (TC) by nZVI/MoS 2 composites was investigated to evaluate the removal performance of nZVI-based composites. The characterizations showed that the addition of MoS 2 increased the dispersion of nZVI, provided multiple electron-rich active sites and facilitated the electron transfer of photocatalysis. The addition of TC significantly enhanced the Cr(VI) removal rate, increasing it from 60 % to 80 % within 10 min. The catalytic reaction rate of nZVI/MoS 2 increased from 0.0046 to 0.0163 min −1 . Furthermore, the presence of Cr(VI) also improved the photodegradation efficiency of TC. Based on XPS and EPR analyses, the synergistic removal of Cr(VI) and TC was mainly attributed to enhanced electron transfer promoted by the presence of TC, which accelerated the photocatalytic reduction of Cr(VI) to Cr(III). Surface complexation modeling further confirmed that Cr(VI) removal by nZVI/MoS 2 involved both adsorption and reduction processes. These results are anticipated to inform the design of more efficient nZVI-based composites for practical applications in environmental remediation.
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RSC Advances
·
2018
·Vol. 8
·期 58
·33217-33227
·
IF 2.936
Wenjie Tang,Yue Wu,Tingting Gao,Yingqin Wei,Guowei Zhou
In the present work, leucoemeraldine-based hybrid porous polyanilines (LHPPs) have been synthesized by the Friedel–Crafts reaction of leucoemeraldine and octavinylsilsesquioxane (OVS) for Cr(VI) removal. The resulting LHPPs were characterized by Fourier transform infrared spectroscopy, powder X-ray diffraction, thermogravimetric analysis, scanning electron microscopy and N2 adsorption–desorption. The findings indiated that the LHPPs were amorphous, with apparent surface areas (SBET) in the range of 147 to 388 m2 g−1 and total volumes in the range of 0.13 to 0.44 cm3 g−1. Cr(VI) removal experiments displayed that the LHPPs exhibited highly efficient Cr(VI) removal performance. The maximum Cr(VI) removal capacity of LHPP-1 was 990.1 mg g−1 at 308 K and pH 1, which is higher than those of other reported polyaniline-based adsorbents. The adsorption process was a spontaneous, endothermic and chemical adsorption process. The adsorption behavior agreed well with Langmuir models and pseudo second-order equations. X-ray photoelectron spectroscopy and Fourier transformed infrared (FTIR) spectroscopy analysis revealed that the highly efficient Cr(VI) removal performance can be mainly attributed to the existence of numerous amine and imine groups on the surface of the LHPPs; these can function as adsorption active sites for Cr(VI) removal through electrostatic adsorption and reduction to Cr(III) under acidic conditions. Moreover, the LHPPs exhibited excellent adsorption selectivity for Cr(VI) despite the presence of other metal ions (K+, Cu2+, Mn2+) and anions (NO3−, SO42−). Therefore, the LHPPs have potential applications for Cr(VI) removal in industrial wastewater.
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高影响因子
ACS Sensors
·
2018
·
IF 5.711
Jieyao Song,Hongjian Zhou,Rui Gao,Yong Zhang,Haimin Zhang,Yunxia Zhang,Guozhong Wang,Po Keung Wong,Huijun Zhao
Selective determination of aquatic chromium is critically important because of the dramatic differences in health and environment impacts by trivalent and hexavalent forms of chromium; however, it is challenging. In this work, for the first time, a nonconjugated polymer fluorophore (GCPF) was synthesized by cross-linking chitosan with glutaraldehyde via Schiff base reactions and systematically investigated for selective determination of Cr(VI). The results revealed that the synthesized GCPF exhibited excellent photostability and water solubility. More importantly, GCPF possessed dramatically enhanced fluorescence intensity originated from the n−π* transitions of the Schiff base subfluorophore groups (e.g., C═N) that can be selectively and sensitively quenched by Cr(VI) through oxidative damages to C═N group. An effective EDTA masking agent approach was employed to minimize ionic interferences. In the presence of high concentration of interference ions including Cr(III), the quenching GCPF fluorescence is capable of selectively determining Cr(VI) within a concentration range up to 50 μM and a detection limit of 0.22 μM. The analytical performance of GCPF was also confirmed by analyzing real surface water and industrial samples.
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Desalination and Water Treatment
·
2024
·
IF 1
Jie Li,Jiangtao He,Jianhong Huang,Qun Zhao,Yingjie Li,Senlin Tian
In this study, a novel set of polyamidoamine (PAMAM) dendrimer-modified biochar adsorbents (BC-G1, BC-G2, and BC-G3) were fabricated using the “graft onto” method. The results showed that the modified biochar adsorbents, with the inclusion of amine functional groups, exhibited higher Cr (VI) removal efficiency compared with the original biochar at pH 2. The adsorption capacity of biochar adsorbents was in the following order: BC-G2 > BC-G1 > BC-G3, with maximum adsorption capacity of 120.77, 101.52, and 40.98 mg/g at 30°C, respectively. The effects of cations Cu (II), Cd (II), Mn (II), Ca (II), and K (I) or anions (Cl – , NO 3 – , and HPO 4 2– ) in wastewater on the adsorption of Cr (VI) were insignificant, except for SO 4 2– . The adsorption process of all biochar materials for removing Cr (VI) was well described using the pseudo-second-order kinetics model and Langmuir adsorption isotherm model. The Cr (VI) adsorption was primarily based on the chemical adsorption of a single molecular layer, accompanied by electrostatic interaction, reduction, and surface complexation. In addition, the adsorbents could be regenerated using a 0.2 M NaOH solution, and the adsorption capacity of the BC-G2 remains high for four adsorption–desorption cycles. Therefore, PAMAM dendrimer-based biochar adsorbent (BC-G2) can effectively remove Cr (VI) from wastewater.
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高影响因子
IEEE SENSORS JOURNAL
·
2025
·
IF 4.5
Chunlan Liu,Zichun Zhao,Yabin Shao,Yong Wei,Ziqiang Zhang,Chao Guo,Zhihai Liu
Hexavalent chromium (Cr(VI)), as a highly toxic and carcinogenic heavy metal ion, poses a serious threat to the environment and human health. Therefore, specific detection of it is of great significance. Based on this, this article proposes a balloon shaped fiber SPR sensor with microsphere structure for specific detection of hexavalent chromium ions. The balloon structure facilitates the formation of insertable sensing probe, and the microsphere structure located on one side of the balloon structure can adjust the incidence angle of light in the sensing area to enhance the sensitivity of the sensor, resulting in a maximum refractive index sensitivity of 5068 nm/RIU. Modifying 4-mercaptoethylpyridine on the surface of the gold film of the sensor can achieve specific recognition of Cr(VI). The experimental results indicate that the balloon shaped SPR sensor with microspheres proposed in this paper has a detection limit of as low as 0.57ng/mL for Cr (VI) in the detection range of 1ng/mL-100μg/mL, with a detection time of 3 minutes, providing a new method for rapid, low concentration, and specific detection of Cr(VI).
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Meng Li,Chunxia Tang,Shaohai Fu,Kam Chiu Tam,Yongzhong Zong
The reduction and sequestration of toxic Cr(VI) via a one-step process in an aqueous solution is critical to eliminate its environmental risk. In this study, amine functionalized cellulose-based aerogel beads (CGP) was developed for simultaneous and efficient adsorption- reduction- sequestration of Cr(VI). CGP showed a maximum Cr(VI) adsorption capacity of 386.40 mg/g at 25 °C due to its strong electrostatic attraction towards Cr(VI). The simultaneous Cr(VI) adsorption- reduction- sequestration performance of CGP over a wide Cr(VI) concentration range was examined. The mechanism was investigated in-depth via the analysis of adsorption kinetics , XPS spectra, and FTIR spectra. Moreover, the Cr immobilization stability of CGP after adsorption was evaluated in simulated neutral, acidic, and alkaline conditions. The effect of pH, temperature, ionic strength and the presence of interfering ions on CGP adsorption performance were investigated by batch adsorption experiments. Fixed-bed column adsorption study was performed to explore the application potential of CGP beads in a wastewater treatment process.
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高影响因子
Biochar
·
2022
·Vol. 4
·期 1
·1-17
·
IF 11.452
Che Naiju,Liu Na,Li Yinhui,Li Chao,Liu Yanli,Li Chengliang
Graphene-based composite aerogel doped with other low-cost materials can reduce the cost and promote the use in water treatment. This work prepared ball-milled biochar/reduced graphene oxide aerogel (BC/rGA) using GO and low-cost ball-milled biochar (BC) in a certain proportion with the freeze-thawing technique and sol–gel method, and applied BC/rGA on the Cr(VI) removal from aquatic environments. The characterization results showed that aerogel had a honeycomb briquette three-dimension (3D) and mesoporous structure with interconnected pores, and proved the preparation progress of aerogel in principle. Compared with GO, rGA and BC/rGA had better adsorption performance with 3D structure and well-developed pores, and BC/rGA with the mixture ratio of BC and GO of 1:4 was more appropriate. The adsorption kinetics data of rGA and BC/rGA (1:4) were fitting well with the pseudo-second-order model ( R 2 > 0.951), and the isotherm adsorption results were fitting the Langmuir model well ( R 2 > 0.974). The results demonstrated that the adsorption process was monolayer and endothermic adsorption involving chemisorption. Additionally, the adsorption capacities of rGA and BC/rGA (1:4) at solution pH 2 were 3.71 and 3.89 times greater than those at solution pH 8, respectively. High background ion strength and low temperature slightly inhibited the adsorption of Cr(VI) by both rGA and BC/rGA (1:4) . The adsorption mechanisms of Cr(VI) on rGA and BC/rGA (1:4) were electrostatic interaction, reduction and ion exchange. The use of BC/rGA could reduce the cost and promote the green reuse of agricultural waste. Overall, BC/rGA could be used as a promising green adsorbent alternative for the feasible treatment of heavy metal contaminated water. Graphical Abstract
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Desalination and Water Treatment
·
2014
·
IF 0.987
Ruihua Huang,Bo Wang,Bingchao Yang,Dongsheng Zheng,Zengqiang Zhang
An adsorbent was prepared from bentonite modified by hexadecyltrimethylammonium bromide (HDTMAB) and N-2-hydroxypropyl trimethyl ammonium chloride chitosan (HTCC). This adsorbent was named as HDTMAB–HTCC bentonite. It would be used for the simultaneous adsorption of phenol and Cr(VI) from aqueous solution. By the method of single-factor experiment, the optimum preparation conditions of HDTMAB–HTCC bentonite were obtained. For bentonite (5 g), 1.0 g HDTMAB and 0.5 g HTCC were adopted as the modifying reagents. The reaction was carried out for 2 h at 80°C. The removals towards phenol and Cr(VI) enhanced with the increase in the amount of adsorbent dosage. The relatively high removals towards phenol and Cr(VI) occurred at a pH value of 1.5 or so. During the simultaneous adsorption process of phenol and Cr(VI), phenol was adsorbed by the partition from the organic phase formed by HDTMAB, while Cr(VI) was mostly adsorbed by the electrostatic interactions between HTCC and Cr(VI). No direct competition was observed due to different adsorption sites.
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Sensor Letters
·
2017
·Vol. 15
·期 8
·682-689
·
IF 0
Li Yueqi,Hu Jingfang,Zou Xiaoping,GuoweiGao
In this paper, a simple and highly sensitive sensing interface of graphene film for hexavalent chromium (Cr(VI)) determination has been prepared by controllable electrochemical deposition on the gold electrode surface. The graphene film was obtained by direct electroreduction of graphene
oxide (GO) in suspension solution. The investigations on deposition parameters of this controllable preparation, such as potential and deposition time, were carried out by the potentiostatic method to study the effects of them on the graphene film. The fabrication process and electrochemical
properties of graphene film were characterized by scanning electron microscope (SEM), transmission electron microscope (TEM) and electrochemical techniques, respectively. The conditional parameters, including detection potential, the concentration of supporting electrolyte and pH, were optimized
for Cr(VI) analysis. Without preconcentration, chronoamperometry method was used for Cr(VI) fast detection. Under the optimized conditions, the graphene film modified electrode provided a fast detection process, a wide linear range from 5 μg/L to 2000 μg/L, and a low detection
limit of 0.5 μg/L (S/N ≥ 3). Also, the developed graphene film showed a good stability and anti-interference for Cr(VI) determination. The reported work holds promise for practical application due to its simple, fast, environment-friendly and economical natures.
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