PLANT AND SOIL
·
2026
·
IF 4.8
Cai Qiyang,Xu Fanghao,Zhang Shuaishuai,Cao Fengjing,Wang Ke,Dong Daming,Zhao Xiande
Aims Plants serve as bioindicators of environmental heavy metal pollution. Rapid, non-destructive techniques for plant elemental analysis are essential for understanding pollutant uptake and nutrient interactions. This study aimed to develop a novel approach integrating Laser-Induced Breakdown Spectroscopy (LIBS) with guttation fluid for non-destructive monitoring of elemental dynamics in Alocasia under Cr (III) stress. Methods Guttation fluid (easy to collect and with a large volume) was collected non-destructively from hydroponically cultivated Alocasia plants subjected to Cr (III) stress. LIBS analysis was performed on fluid samples using a liquid-to-solid enrichment strategy to enhance trace detection. Signal validation was conducted via comparison with Inductively Coupled Plasma Mass Spectrometry (ICP-MS) measurements. Results Guttation fluid elemental composition strongly correlated with plant tissues. Under Cr(III) stress, Cr signal intensity increased with stress concentration, while Mg and Ca signals decreased by approximately 30–40%. The accumulation of Cr in guttation fluid continued to rise to a peak and then decreased (likely associated with root damage). LIBS results showed significant correlation with those obtained by ICP-MS (R 2 = 0.995 for Cr(Ⅰ)). The method achieved a detection limit of 20.3 ppb for Cr with excellent linearity (R 2 = 0.963). Conclusion This LIBS-guttation fluid approach provides a reliable, non-destructive means to monitor plant responses to heavy metal stress, offering potential for environmental biomonitoring and crop safety assessment.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2026
·
IF 6.3
Menghang Qi,Xin Xin,Liangsheng Tian,Yutong Wang,Hang Zhao,Peng Jiang,Pakuna Panbo,Suwit Suthirakun,Lin Shi,Nan Hu,Olga Burgos-Montes,Margarita Álvarez
The novel green Bi 4- x Cr x Si 3 O 12 (0.1 ≤ x ≤ 0.4) pigments with near-infrared solar reflectance (R*%) of up to 82.75% were successfully synthesized by the solid-state method. All the XRD patterns are indexed with Bi 4 Si 3 O 12 (space group I -43 d ). Indicated by XPS analysis, the oxidation state of Cr in the as-prepared green pigment is +3. The green color is caused by the 4 A 2g → 4 T 1g ( 4 F) and 4 A 2g → 4 T 2g ( 4 F) transition of Cr 3+ based on the UV-Vis-NIR spectrum. The influence of pigment bandgap changes on coloration is elaborated through the calculation of the pigment's electronic structure. The novel green ceramic glaze was prepared by compounding 10 wt.% of the as-synthesized pigment with the glaze powder. The R*% of the glaze samples are all above 93%, proving that all the glaze samples have extremely high near-infrared reflection performance and great application potential. The macroscopic surface of the glaze is smooth and uniform. Using an optical microscope (with magnifications ranging from 50× to 1000×) to observe the removed glassy surface, no bubbles or cracks were found. The pigment particles are evenly and stably dispersed in the glaze. In the SEM test, it was found that there were closed bubbles with diameters around 20 μm in the glaze layer. Moreover, through X-CT scanning, the volume proportion of pores in the glaze sample was only 0.32%, which proved that the glaze has good density.
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CARBOHYDRATE POLYMERS
·
2026
·
IF 13.2
Xiaohan Zhao,Yubin Huang,Zhenhong Huang,Hongzhi Liu
The hazards of aqueous Cr (VI) are severe, necessitating adsorbents with high capacity, applicability, and recyclability. In this study, a novel water-soluble cationic quaternary ammonium silsesquioxane (SQ-N) was synthesized and subsequently reacted with chitosan (CS), polyethylene glycol diacrylate (PEGDA), and pentaerythritol tetrakis (3-mercaptopropionate) (PETMP) to fabricate a flexible chitosan hybrid cryogel (PPSC-x (x = 1, 2, 3)) through UV cross-linking followed by freeze-drying. The resulting cryogel was comprehensively characterized using FTIR, XRD, TGA, SEM, EDS, and XPS analyses. The PPSC-x (x = 1, 2, 3) cryogel possessed abundant active sites and superior mechanical properties, rendering them suitable for the efficient removal of Cr (VI) from wastewater. The adsorption process was spontaneous and endothermic, achieving a maximum equilibrium adsorption capacity of 274 mg g −1 at 328 K. The adsorption of Cr (VI) followed a pseudo-second-order kinetic model and conformed to the Langmuir isotherm. PPSC-3 maintained >90% removal efficiency over five cycles and demonstrated notable antibacterial activity against Escherichia coli and Staphylococcus aureus . A prototype device further validated its practical potential for wastewater treatment.
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PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Jing Zhang,Wenyu Xie,Shasha Chu,Zhangbin Liu,Zhen Wu,Yingying Lan,Vladimir V. Galvita,Lijuan Zhang,Xintai Su
Chromium ore processing residue (COPR) is a hazardous waste generated during the production of chromate. Currently, approximately 10% of Cr 2 O 3 cannot be extracted after chromite sodium roasting and remains in COPR, wasting valuable Cr resources. In this study, Mg was selectively removed by using (NH 4 ) 2 SO 4 roasting in combination with H 2 SO 4 leaching. The results showed that the selective removal of 79.55% Mg from COPR could be achieved under the optimum (NH 4 ) 2 SO 4 roasting conditions (80 mmol (NH 4 ) 2 SO 4 , 800 °C, 2 h). During the subsequent sodium roasting and acid leaching stages, the Cr extraction rate was 84.63% for the COPR direct roasting and 95.39% for the Mg removal residue roasting. The increased Cr extraction efficiency is attributed to the transformation of Mg-rich spinel and diopside (the Mg & Cr coexisting phases) in COPR converted into easily extractable (Fe,Cr) 2 O 3 and Cr 2 O 3 after the Mg treatment. This study investigated that the phase transformation of the Cr host phases is crucial for the sufficient extraction of Cr and provides inspiration for the development of efficient and practical Cr extraction techniques. Moreover, the method can be extended to the effective extraction of Cr from other Cr-containing wastes.
研究领域:
冶金工程
·
环境科学
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SYNTHETIC METALS
·
2016
·
IF 2.299
Jianyu Ren,Xiongyi Huang,Ning Wang,Kezhen Lu,Xingxiang Zhang,Wei Li,Dongqin Liu
A composite nanofibers mat containing polyacrylonitrile (PAN) as core and polyaniline (PANI) as sheath had been successfully prepared via solution spinning followed by in situ polymerization, and its hexavalent chromium (Cr(VI)) removal potential was investigated. By altering the processing parameters, bead-free and uniform PAN nanofibers with average diameter of 469 nm could be obtained. The morphological evolution of the PANI/PAN composite fiber mats could be controlled through regulating the molar ratio of oxidant to monomer. The PANI/PAN composite fiber mats presented a superior Cr(VI) adsorption performance. Moreover, the factors affecting the performance of Cr(VI) removal from the aqueous solutions were investigated systematically. The experimental data were fitted to various kinetic models and isothermal adsorption, and the thermodynamic parameters of adsorption process were calculated as well. The PANI/PAN adsorbents were also proven to have good recycling capability, and the mechanism of adsorption and regeneration was investigated in detail.
研究领域:
环境科学
·
材料科学
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CHEMOSPHERE
·
2022
·
IF 8.943
Yinghua Li,Yue Zhang,Fei Su,Yiyan Wang,Linlin Peng,Deze Liu
As the important carriers of environmental pollutants, microplastics have a significant impact on the migration, transformation and toxicology of heavy metals . In this paper, the adsorption behavior of Cr(VI) on PE/PS/PA microplastics under UV irradiation was studied. The research results show that the adsorption capacity of original PA is the strongest, followed by PS and PE . The specific surface area of the aged microplastics increased and new functional groups were formed, so the adsorption of three microplastics for Cr(VI) was stronger than that before aging. The average saturation adsorption of Cr(VI) by PA/PS/PE increased respectively from 730.69 μg/g, 146.11 μg/g and 75.61 μg/g to 736.31 μg/g, 318.75 μg/g and 136.78 μg/g. The Langmuir and Freundlich models showed that the adsorption is more consistent with the Freundlich model, indicating that adsorption is mainly based on multi-molecular layer adsorption on non-homogeneous surfaces. In the Cu–Cr polluted water, Cu has different effects on the adsorption behavior. Cu can promote the adsorption of Cr(VI) by PE and PS , while inhibited the adsorption by PA . In addition, environmental conditions such as temperature, pH and dissolved organic matter also have significant effects on adsorption behavior. Mechanistic analysis confirmed that electrostatic interaction plays an important role. Secondly, based on the surface physicochemical properties of the microplastics, surface complexation and van der Waals forces also significantly enhance the adsorption of Cr(VI) on the aged microplastics.
研究领域:
环境科学
·
毒理学
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Chemical Science
·
2026
·
IF 7.4
Jiahe Li,Gaili Ke,Minji Yang,Guoliang Lv,Lanyi Cao,Wenjun Li,Tao Han,Wenrong Wang,Yong Zhou,Huichao He
The presence of Cr defects in monoclinic PbCrO4 is closely related to its solar water oxidation activity, which be overlooked in the preparation of PbCrO4 films and unrevealed in the researches of PbCrO4 photoanodes. Herein, monoclinic PbCrO4 films with few Cr defects (PbCrO4-FVCr) were prepared on FTO substrate through covering the drop-coating Pb2+/Cr3+ precursor solution to reduce the loss of Cr during thermal treating. Relative to the monoclinic PbCrO4 films with rich Cr defects (PbCrO4-RVCr), higher solar water oxidation activity was achieved on the PbCrO4-FVCr films as photoanodes. At 1.23 V vs. RHE, a higher water oxidation photocurrent of 1.13 mA cm-2 was produced on the PbCrO4-FVCr film photoanodes, which is two-fold to the PbCrO4-RVCr film photoanodes (0.55 mA cm-2). Meanwhile, the PbCrO4-FVCr film photoanodes had faster water oxidation kinetics than PbCrO4-RVCr film photoanodes. The water oxidation rate constant (kO2) on the PbCrO4-FVCr film photoanodes was 40.6 s-1, while a lower kO2 of 8.2 s-1 on the PbCrO4-RVCr film photoanodes. Experimental detections and theoretical calculations jointly revealed that PbCrO4 films with fewer Cr defects being of higher solar water oxidation activity can be attributed to following reasons: (i) the presence of Cr defects can result in the formation of deep energy level in PbCrO4, which is unfavorable to carrier transfer in the bulk of PbCrO4 films; (ii) the presence of Cr defects can cause the formation of unsaturated O dangling bonds on PbCrO4, which are harmful traps for carrier separation on the surface of PbCrO4 films; (iii) Cr has a half-filled 3d5 orbital to provide active sites for reaction, the presence of Cr defects weakens the catalytic activity of PbCrO4 for water oxidation, and turns the rate-limiting step to the dehydrogenation of *OH into *O which requires a high energy barrier of 1.88 eV. The present work provides insight into monoclinic PbCrO4 film photoanodes from the relevance of preparation condition, Cr defects, water oxidation activity and reaction mechanism.
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Desalination and Water Treatment
·
2024
·
IF 1
Yongjun Sun,Aowen Chen,Wenquan Sun,Kinjal J. Shah,Huaili Zheng,Chengyu Zhu
In this work, carboxylated chitosan and acrylamide are used to synthesize a graft-modified natural polymer flocculant carboxylated chitosan-graft-acrylamide (CCSPAM) by UV-induced polymerization for copper and chromium removal. The effects of total monomer concentration, monomer mass ratio, pH value, photoinitiator concentration, and illumination time on the synthesis performance of CCSPAM were investigated regarding intrinsic viscosity (IV), grafting rate (GR), and grafting efficiency (GE). Various analytical techniques characterize the physicochemical characteristics of CCSPAM. Single factor experiments are used to investigate the effect of dosage, pH value, and reaction time on the chelation and capture of heavy metal ions by CCSPAM. The results show that the optimal IV, GR, and GE of CCSPAM achieved at total monomer concentration 30%, monomer mass ratio 1:4, pH 7.0, photoinitiator concentration 0.03%, and irradiation time 2 h are 1412.2 mL/g, 394.1%, and 84.1%, respectively. The experimental data of flocculation show that CCSPAM has a good total Cu and total Cr removal efficiency of 74.8% and 70.6% at dosage 2.0 mg/L, pH 6.0, and reaction time 2h, respectively. Fom the investigation, it is concluded that the grafted chitosan (CCSPAM) could be a be an effective and eco-friendly flocculant for removal of total Cu and total Cr ions from aqueous system.
研究领域:
环境化学
·
高分子科学
·
水处理
·
重金属修复
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Molecular Catalysis
·
2026
·
IF 4.3
Chuanhua Li,Yubao Shi,Linxia Chen,Ziheng Wang,Wei Xiao,Xuemin Yan
Electrolysis of water to produce hydrogen can alleviate the problem of global energy shortage, and seeking efficient water splitting electrocatalysts is the promising direction. In this work, Cr-doped nickel oxalate (Cr-NiC 2 O 4 /NF) was synthesized on nickel foam (NF) by a one-step hydrothermal method and used as an alkaline electrolytic water catalyst. The electrocatalytic activity of NiC 2 O 4 is significantly improved by Cr doping. For the oxygen evolution reaction (OER), the overpotential is 324 mV at 100 mA cm -2 , and for the hydrogen evolution reaction (HER), the overpotential is 191 mV at 10 mA cm -2 . When Cr-NiC 2 O 4 /NF is used as anode and cathode in water splitting, only voltage of 1.58 V is required at current density of 10 mA cm -2 . Furthermore, the mechanism of enhanced catalytic activity via surface reconstruction during the OER and HER was systematically studied. The pre-catalyst Cr-NiC 2 O 4 was restructured into hydroxides and hydroxyl oxides for OER, and some Cr-NiC 2 O 4 was converted into hydroxides for HER. Consequently, this investigation provides a new method to improve the electrocatalytic performance of metal oxalates and a theoretical guidance for surface reconstruction.
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CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Yanli Wang,Hongyi Li,Huijun Liu,Lingxu Yang,Chaoliu Zeng
In this work, two Cr-free high entropy oxides (HEOs), an equimolar (MnFeCoNiCu) 3 O 4 and a non-equimolar (Mn 0.272 Fe 0.272 Co 0.272 Ni 0.092 Cu 0.092 ) 3 O 4 have been synthesized by a solid-state reaction method. The reaction sequence and electrical conductivity were also studied for these two HEOs. It is demonstrated that a rock-salt phase containing a solid solution of NiO and CuO appears in the synthesizing process of (MnFeCoNiCu) 3 O 4 , which is ascribed to the incomplete solubilization of rock-salt phase in the spinel phase. For (Mn 0.272 Fe 0.272 Co 0.272 Ni 0.092 Cu 0.092 ) 3 O 4 , a single spinel phase (Fd-3m) is obtained at 750 °C, which is much lower than that of the (MnFeCoNiCu) 3 O 4 sample. Furthermore, Mn, Fe, Co, Ni elements exist in the chemical states of +2 and + 3, and Cu exists in Cu 2+ state. The electrical conductivity of (Mn 0.272 Fe 0.272 Co 0.272 Ni 0.092 Cu 0.092 ) 3 O 4 is approximately 15.77 S cm -1 at 800 °C, which is nearly three times higher than that of the (MnFeCoNiCu) 3 O 4 sample.
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WATER AIR AND SOIL POLLUTION
·
2023
·Vol. 234
·期 2
·1-13
·
IF 2.9
Wei Yaru,Zhang Kaili,Cheng Tiexin,Zhou Guangdong
In this paper, FeS m /BC composites were prepared using coconut shell biochar (BC) as the carrier. FeS m on FeS m /BC is preferentially oriented along the (001) crystal plane and exhibits a uniform honeycomb morphology. It has a high specific surface area and a small pore size distribution, which is more suitable as a heavy metal ion removal material. The results show that Cr(VI) can be almost completely removed within 120 min under acidic conditions with an initial concentration of 10 mg/L of Cr(VI), a temperature of 20 °C, and a dosage of 0.6 g/L of adsorbent. Where pH was the main factor influencing the removal of Cr(VI):pH affects Cr(VI) removal by changing the form of Cr(VI) in the solution, adsorption free energy, redox potential, charged species on FeS m /BC surface, and the reduction properties of Fe 2+ and S 2− , low pH value is more favorable for Cr(VI) removal. Coexisting anions in solution inhibit Cr(VI) removal due to competitive adsorption, but coexisting cations have no effect. The adsorption process of Cr(VI) by FeS m /BC follows the pseudo-second-order kinetics and Langmuir adsorption isotherm model, indicating that the adsorption process is a monolayer surface adsorption controlled by the chemical adsorption mechanism and involves electron sharing or exchange between adsorbent and adsorbate. Thermodynamic study shows that the adsorption process is a spontaneous entropy-increasing process, and raise the temperature is beneficial to the adsorption. The removal of Cr(VI) by FeS m /BC is the synergistic effect of adsorption, reduction, and co-precipitation.
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Surfaces and Interfaces
·
2022
·
IF 6.137
Yanfeng Huang,Yuliang Tu,Jinxiong Wu,Xiangjing Liang,Dongye Zhao,Patrycja Boguta,Xintai Su
Cr-contaminated soil is a serious threat to the ecological environment and human health because of its high toxicity of Cr(VI), and it needs to be treated properly. In this study, commercial humic acid (HA) was used as an extractant to treat high concentration of Cr contaminated soil (amorphous phase bound state), and the Cr(VI) removal rate was 90.55% under the optimal conditions (pH = 12, concentration 1 g/L, extraction time 24 h, liquid-solid ratio = 20:1). In this process, the remaining Cr species in the HA-treated soil was the most stable and the least mobile, with the highest retained native soil organic matter (SOM) compared to ethylenediaminetetraacetic acid (EDTA) and citric acid (CA). In addition, the economic cost advantage of HA was outstanding at only $55.3 per ton of soil contaminated with high concentrations of Cr(VI). Studies have shown that HA can be a "green" and more cost effective alternative to the traditional extractants EDTA and CA when targeting extraction treatments for high concentration Cr-contaminated soils and other Cr-containing wastes.
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