BIOLOGICAL TRACE ELEMENT RESEARCH
·
2021
·Vol. 200
·期 3
·1408-1417
·
IF 3.738
Liu Peng,Xiao Weiwei,Wang Kai,Yang Zhaoguang,Wang Lin
Rice and rice products are the main sources of Cd contamination in humans. The total and bioaccessible concentrations of Cd and three divalent nutrients, Mn, Cu, and Zn, in locally grown rice grains from Hunan and Guangdong Provinces in China were investigated. An in vitro physiologically based extraction test method was introduced to evaluate the bioaccessibility of the target metals in the rice grains. The mean concentrations of Cd in the rice grains were 0.245 mg/kg and 0.235 mg/kg from Hunan and Guangdong Provinces, respectively. Large variations were observed in the Cd concentrations, indicating a heterogeneous distribution of Cd contamination throughout the study areas. The bioaccessibility of Cd, Mn, and Zn in the gastrointestinal fractions was significantly lower than that in the gastric fractions. In contrast, the bioaccessibility of Cu at the intestinal phase was detected in the rice grains from both provinces. The correlation analysis showed significant relationships between total Cd concentrations and bioaccessible Cd fractions, indicating that higher total Cd in rice grains always resulted in higher bioaccessible Cd. Consistent correlations in the rice grains were observed between Zn and Mn. However, a lack of correlation was found between Cd and Zn in the current study. Risk assessment according to bioaccessible Cd would significantly reduce the exposure risk to Cd from rice consumption.
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Inorganic and Nano-Metal Chemistry
·
2021
·
IF 1.716
Weiqiang Xu,KaiKai Hu,Shouwen Jin,Yuting Zhang,Daqi Wang
Transition metal carboxylates with O- and N-donor ligands are interesting for their structural features. Seven novel isonicotinamide(inic)-based metal complexes of [Cd(inic)2(L1)2(H2O)2] · 2H2O (1) (L1 = 2-chloronicotinate), [Cd(inic)2(L2)2(H2O)2] (2) (L2 = 2,4-dichlorobenzoate), [Cu(inic)2(L3)2] (3) (L3 = 4-chlorophenoxyacetate), [Cu3(inic)6(L4)2(HL4)2(H2O)2] · 2H2O (4) (L4 = azelate), [Zn(inic)2(L1)2(H2O)2] · (inic) · H2O (5), [Zn(inic)(L5)(H2O)4] (6) (L5 = 3-nitrophthalate) and [Zn2(inic)2(L6)2] · 5H2O (7) (L6 = 1,4-cyclohexanedicarboxylate) have been obtained by the introduction of the carboxylates by the common solution method and are structurally featured by different techniques of EA, IR spectra, TG and SCXRD analysis. The X-ray studies told that these complexes display mononuclear to trinuclear structures with octahedral/square-pyramidal geometry around the Zn2+, trigonal bipyramidal/octahedral at the Cu2+ and octahedral for the Cd2+. The inic in 1–7 are coordinated only in monodentate fashion with its ring N, while 5 has the lattice inic. The carboxylates coordinated to the metal in monodentate, chelating bidentate and bridging bidentate fashions. The pair of complementary N-H···O H-bonds from the CONH2 of the inic were found in all compounds except 7. Except 1 and 2, all other compounds bear the CH-O contacts from the pyridine CH of the inic. The intricate intra- and intermolecular classical H-bonds, CH-N, CH-O, CH-Cl, CH2-O, O-N, O-O, Cl-O, Cl-Cl, CH-π, CH2-π, C-π, N-π, Cl-π and π-π associations are elucidated by the X-ray crystallographic studies, which push the discrete complexes into high-dimensional ordered supramolecular structures.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2025
·
IF 6.3
Mengzhu Li,Yanqing Wang,Zhiping Fang,Dongchen Guo,Min Fan,Hui Dai,Fuling Guo,Wangchao Chen,Chengwu Shi,Peng Cui
Antimony selenosulfide (Sb 2 (S,Se) 3 ) demonstrates strong potential for thin-film solar cells owing to its tunable bandgap, low toxicity, and high stability. However, conventional fabrication methods often yield films with small grain sizes and random orientations, which hinder device performance. Herein, an in situ polymerization-assisted grain growth (iPAGG) strategy was developed, specifically enabling the oriented growth of Sb 2 (S,Se) 3 on Cd-free TiO 2 substrates, by introducing acrylic acid (AA) into the chemical bath deposition process. The carboxylate groups from AA coordinate with Sb 3+ ions, promoting oriented growth of Sb 2 (S,Se) 3 film. This approach yields films with enlarged grains, reduced defect densities, and strengthened [ hk 1] preferred orientation. As a result, Cd-free Sb 2 (S,Se) 3 solar cells employing the optimized AA concentration yielded a champion power conversion efficiency (PCE) of 7.24%, outperforming the control device (6.70%). Further interfacial modification with poly (acrylic acid)-modified SnO 2 boosts the PCE to 7.55%. This work offers an effective way toward the fabrication of high-performance and environmentally friendly Sb 2 (S,Se) 3 photovoltaics.
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JOURNAL OF ANALYTICAL CHEMISTRY
·
2017
·Vol. 72
·期 6
·682-688
·
IF 0.723
Pan Yan,Dong Yong-Ping,Chu Xiang-Feng,Ding Hou-Cheng
Polypyrrole-sepiolite ( PPy/SPL ) nanofibers were prepared by in situ chemical oxidation polymerization in the presence of sepiolite. A PPy/SPL composite modified glassy carbon electrode ( PPy/SPL/GCE ) was prepared and characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, and electrochemical methods. Differential pulse anodic stripping voltammetry for the simultaneous determination of trace Pb(II) and Cd(II) was carried out at the PPy/SPL/GCE. Operational parameters such as the deposition potential and time, the amount of modified suspension, and the pH values were optimized for the purpose of determination of trace metal ions in 0.10 M acetate buffer solution. Under the optimal conditions, the stripping peak currents showed good linear relationships with Pb(II) and Cd(II) at concentration ranges of 5.0 × 10 –9 ‒1.2 × 10 –6 M and 5.0 × 10 –9 ‒1.2 × 10 –7 M, and the detection limits were 1.2 and 1.5 nM, respectively. The proposed method is applicable to the simultaneous determination of trace Pb(II) and Cd(II) in real water samples with the relative standard deviations of less than 4.4% and the recovery rates of 97.9‒102.2%.
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CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Hua Yu,Meng Hu,Zhen Hu,Fei Liu,Haizhong Yu,Qiaomei Yang,Hairong Gao,Chengbao Xu,Meiling Wang,Guifen Zhang,Yun Wang,Tao Xia,Liangcai Peng,Yanting Wang
Pectin is a minor wall polysaccharide with potential applications for bioproducts . Despite the application of specific plants and biomass-based sorbents for environmental remediation, little has been reported about characteristic roles of pectin. Using the natural rice mutant ( Osfc16 ) treated with Cd , this study explored that pectin could predominately enhance Cd accumulation with lignocellulose, mainly due to remarkably raised uronic acids deposition. The Cd-treatment further reduced lignocellulose recalcitrance for significantly enhanced biomass saccharification and bioethanol production along with almost complete Cd release. Using all remaining fermentation rice residues that are of typical ribbon-structure and large surface, this study generated novel biosorbents by optimal chemical oxidation with the pectin extraction from citrus peels, and examined consistently raised Cd and methylene blue (MB) adsorption capacities. Therefore, this work has proposed a mechanism model about multiple pectin enrichment roles for Cd and MB removals in agricultural and industry locations with full lignocellulose utilization towards bioethanol production.
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RSC Advances
·
2018
·Vol. 8
·期 19
·10561-10572
·
IF 2.936
Lu Fan,Min Deng,Caixue Lin,Chen Xu,Yana Liu,Zhennan Shi,Yingxi Wang,Zushun Xu,Ling Li,Man He
Fe3O4/MOF (metal organic framework)/L-cysteine was synthesized and applied for the removal of Cd(II) from wastewater. The adsorption kinetics and isotherms were investigated, and the results indicated that the adsorption obeyed the pseudo-second-order kinetic model and Langmuir isotherm. The maximum adsorption capacity was calculated to be 248.24 mg g−1. Fe3O4/MOF/L-cysteine was further applied to determine trace amounts of Cd(II) in real water samples using ICP-AES (inductively coupled plasma-atomic emission spectroscopy) based on magnetic solid-phase extraction (MSPE). The determination limit was 10.6 ng mL−1. Additionally, Fe3O4/MOF/L-cysteine can also be used as a fluorescent sensor for “turn-off” detection of Cd(II), and the detection limit was 0.94 ng mL−1.
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Inorganic Chemistry Frontiers
·
2024
·
IF 6.1
Sidan Wang,Pei Wang,Guojun Zhou,Nan Zhang,Yilin Mao,Xian-Ming Zhang
Low-dimensional chiral metal halides (CMHs) are promising as an industrialized platform for chiral recognition applications; however, there are hardly any luminescent CMHs with variable energy transfer between an organic ligand and an inorganic unit. Herein, an array of rare one-dimensional (1D) luminescent CMHs were engineered by screening R/S-3-aminopiperidine dihydrochloride as a chiral template, in which the chirality of the organic cation is transferred to the inorganic chain via hydrogen bonding interactions in (R/S-C5H14N2)MCl4·H2O (M = Mn, Cd), abbreviated as R/S-Mn and R/S-Cd. The orange emission at 607 nm is attributed to the d–d transition 4T1(G)–6A1(S) of Mn2+ in R/S-Mn, along with an energy transfer from the organic cation to the inorganic chain. In contrast, a reverse energy transfer from the inorganic chain to the organic cation was verified in R/S-Cd, with the emission at 401 nm being attributed to the singlet self-trapped excitons (STEs) of Cd2+. Beyond that, we innovatively proposed that the fluorescence quenching behaviour contributes to the strong stereo-selective fluorescence responsivity for mandelic acid (MA), confirming that R/S-Mn and R/S-Cd are useful for the rapid recognition of R/S-MA. This research not only promotes the discovery of low-dimensional luminescent CMHs but also expands their applications in bio-detection and sensing.
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BMC Chemistry
·
2023
·Vol. 17
·期 1
·1-14
·
IF 4.6
Li Xingjie,Xiao Qiusheng,Shao Qin,Li Xiaopeng,Kong Jiejie,Liu Liyan,Zhao Zhigang,Li Rungen
Biosorbents have been extensively studied for heavy metal adsorption due to their advantages of low cost and high efficiency. In the study, the living and non-living biomass of Cupriavidus necator GX_5 previously isolated were evaluated for their adsorption capacity and/or removal efficiency for Cd (II) through batch experiments, SEM and FT-IR investigations. The maximum removal efficiency rates for the live and dead biomass were 60.51% and 78.53%, respectively, at an optimum pH of 6, a dosage of 1 g/L and an initial Cd (II) concentration of 5 mg/L. The pseudo-second-order kinetic model was more suitable for fitting the experimental data, indicating that the rate-limiting step might be chemisorption. The Freundlich isotherm model fit better than the Langmuir isotherm model, implying that the adsorption process of both biosorbents was heterogeneous. FT-IR observation reflected that various functional groups were involved in Cd (II) adsorption: –OH, –NH, C=O, C–O and C–C groups for the living biomass and –OH, –NH, C–H, C = O, C–N and N–H groups for the dead biomass. Our results imply that non-living biosorbents have a higher capacity and stronger strength for absorbing Cd (II) than living biomass. Therefore, we suggest that dead GX_5 is a promising adsorbent and can be used in Cd (II)-contaminated environments.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 7
·11214-11227
·
IF 0
Li Tiantian,Yang Huan,Zhang Naili,Dong Lijia,Wu Aiping,Wu Qiqian,Zhao Mingshui,Liu Hua,Li Yan,Wang Yanhong
Cadmium (Cd) contamination is a widespread environmental issue. There is a lack of knowledge about the impacts of applying arbuscular mycorrhizal fungi (AMF) and biochar, either alone or in their combination, on alleviating Cd phytotoxicity in Ligustrum lucidum . Therefore, a pot experiment was conducted in a greenhouse, where L. lucidum seedlings were randomly subjected to four regimes of AMF treatments (inoculation with sterilized AMF, with Rhizophagus irregularis , Diversispora versiformis , alone or a mixture of these two fungi), and two regimes of biochar treatments (with or without rice-husk biochar), as well as three regimes of Cd treatments (0, 15, and 150 mg kg −1 ), to examine the responses of growth, photosynthetic capabilities, soil enzymatic activities, nutritional concentrations, and Cd absorption of L. lucidum plants to the interactive effects of AMF, biochar, and Cd. The results demonstrated that under Cd contaminations, AMF alone significantly increased plant total dry weight, soil pH, and plant nitrogen (N) concentration by 84%, 3.2%, and 13.2%, respectively, and inhibited soil Cd transferring to plant shoot by 42.2%; biochar alone significantly enhanced net photosynthetic rate, soil pH, and soil catalase of non-mycorrhizal plants by 16.4%, 9%, and 11.9%, respectively, and reduced the soil Cd transferring to plant shoot by 44.7%; the additive effect between AMF and biochar greatly enhanced plant total dry weight by 101.9%, and reduced the soil Cd transferring to plant shoot by 51.6%. Furthermore, dual inoculation with D. versiformis and R. irregularis conferred more benefits on plants than the single fungal species did. Accordingly, amending Cd-contaminated soil with the combination of mixed-fungi inoculation and biochar application performed the best than either AMF or biochar alone. These responses may have been attributed to higher mycorrhizal colonization, soil pH, biomass accumulation, and biomass allocation to the roots, as well as photosynthetic capabilities. In conclusion, the combined use of mixed-fungi involving D. versiformis and R. irregularis and biochar addition had significant synergistic effects on enhancing plant performance and reducing Cd uptake of L. lucidum plants in Cd-contaminated soil. Graphical abstract
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JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 56
·期 7
·4727-4740
·
IF 3.553
Deng Shuping,Jiang Xianyan,Chen Lili,Zhang Ziye,Qi Ning,Wu Yichu,Chen Zhiquan,Tang Xinfeng
In this paper, we reported the enhanced thermoelectric properties of Cd and Sn dual-doped Cu 3 SbSe 4 -based material prepared by the vacuum melting combined with spark plasma sintering process. X-ray photoelectron spectroscopy studies revealed the presence of Cu + , Cd 2+ , Sb 5+ , Sn 4+ and Se 2− states of Cu, Cd, Sb, Sn and Se, respectively. All samples exhibited p -type conduction with carrier concentrations varying from 0.54 × 10 18 to 46.42 × 10 18 cm −3 , while carrier mobility changes from 18.2 to 46.6 cm 2 V −1 s −1 at room temperature. Cd doping at Cu sites in the Cu 3 SbSe 4 can reduce the lattice thermal conductivity, while Sn doping at Sb sites is effective to adjust the carrier concentration. The further reduction in thermal conductivity is observed in Cd-Sn co-doped samples resulting from an accumulated effect combining point defects and the secondary-phase CdSe. Consequently, the maximum dimensionless figure of merit ( ZT ) value reaches 0.66 at 623 K for the Cu 2.75 Cd 0.25 Sb 0.94 Sn 0.06 Se 4 sample, which is 190% larger than that of the intrinsic sample ( ZT of 0.35). The findings provide an alternative strategy of boosting the carrier and phonon transports of the Cu 3 SbSe 4 , which is also a meaningful guidance to achieve high performance in other copper-based chalcogenides.
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Nanoscale Research Letters
·
2012
·Vol. 7
·期 1
·1-7
·
IF 2.726
Zhang Jun,Zhao Su-Qing,Zhang Kun,Zhou Jian-Qing,Cai Yan-Fei
In the present work, ZnO quantum dots (QDs) have been prepared by the sol–gel method, and the performance of the QDs has been improved. The effect of Cd concentration on the structural and luminescent properties of the QDs, as well as the effect of the mass ratio of trioctylphosphine oxide (TOPO)/octadecylamine (ODA), has been investigated. The ZnO and Cd-doped ZnO QDs have hexagonal wurtzite structures and are 3 to 6 nm in diameter. When the Cd content was increased, the QD particle size was reduced; this effect was confirmed in the corresponding ultraviolet–visible spectra. The fluorescence intensity was simultaneously enhanced significantly. Both the UV and fluorescence spectra were blue-shifted. The luminous intensity was further enhanced when the QDs were modified with TOPO/ODA. Fourier transform infrared and X-ray diffraction techniques proved that the polymer successfully coated the surfaces of the QDs. A TOPO/ODA mass ratio of 1:2 was determined to result in the best optical performance among the different ratios examined. The results showed that the described synthetic method is appropriate for the preparation of doped QDs with high-fluorescence quantum efficiency.
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ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
·
2026
·Vol. 48
·期 10
·422
·
IF 4.3
Wen Kunyu,Wang Mengjie,Wang Bin,Yin Yiwen,Ma Yanbin,Lu Taotao,Miao Renhui,Qi Zhichong
Silica-based nanomaterials have shown promise for remediating heavy metal-contaminated soils. However, their remediation stability may be compromised by natural and anthropogenic activities such as rainfall and irrigation. This work systematically investigates the leaching behavior of Cd from soils amended with unmodified SiO 2 and thiol-functionalized SiO 2 (SH-SiO 2 ) nanoparticles, along with nanoparticle-mediated Cd release and transport through soil porous media. The results demonstrated that the leaching concentrations of Cd 2+ from the soil remediated by SH-SiO 2 were the least and followed the order of SH-SiO 2 < SiO 2 ≈ control (untreated Cd-contaminated soil) under simulated acid rain conditions (pH 5.6). This confirms that thiol-functionalized silica effectively immobilizes Cd due to its strong chelating ability. However, co-transport experiments revealed that both SiO 2 and SH-SiO 2 nanoparticles could act as carriers that enhanced Cd 2+ transport, governed by their Cd-binding capacity and intrinsic mobility over a pH range of 5.0–8.0, with greater facilitation at higher pH levels. Notably, SH-SiO 2 exhibited a much stronger facilitation effect, attributable to its higher affinity for Cd 2+ , greater mobility in porous media, and resistance to desorption of SH-SiO 2 -bound Cd 2+ . At a nanoparticle concentration of 50 mg/L, the maximum breakthrough of Cd 2+ reached 10.1% for SiO 2 and 75.2% for SH-SiO 2 . While SH-SiO 2 demonstrates excellent Cd immobilization capacity and acid-rain resistance, any disturbance that remobilizes these nanoparticles may facilitate the mobility of Cd 2+ , potentially expanding the scope of heavy metal contamination. Therefore, when applying remediation agents for soil rehabilitation, it is crucial to consider their long-term effectiveness and stability.
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