Environmental Technology & Innovation
·
2024
·
IF 6.7
Yanhao Zhang,Wenlu Zhou,Chengying Liu,Guanghui Liu,Yi Li,Botao Ding,Peng Zhang,Xu Zhang,Zhibin Zhang
Wheat straw biochar (BC) or modified wheat straw biochar (MBC) could affect the aggregate structure of soil, effectively adsorb heavy metal and reduce the bioavailability of heavy metals in soil. TGA, BET, FTIR and SEM were used to characterize the surface morphology and structure of BC and MBC. The adsorption properties of BC and MBC on Pb(II) and Cd(II) in solution systems were investigated by batch experiments, and the remediation performance of Pb and Cd contaminated sediment by BC or MBC were studied by pot experiments. The results showed that MBC had a larger specific surface area of 46.04 m 2 /g and total pore volume 0.0555 cm 3 /g; the adsorption isotherms of Pb(II) and Cd(II) for BC and MBC were more suitable for Langmuir model ( R 2 over 0.91), and the maximum adsorption capacities of Pb(II) and Cd(II) by MBC could reach 71.14 and 115.64 mg/g, respectively. BC or MBC promoted the transformation of Pb and Cd from the extractable acid fraction to the oxidizable and residual fraction, reduced the migration of heavy metals and enhanced the stability of aggregates. Therefore, the results provided a perspective for the dredged contaminated sediments used as planting soil. In addition, BC or MBC, as soil amendments, could improve the abundance of microbial community. At the phylum level, the main dominant bacteria were Proteobacteria and Bacteroidetes .
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ENVIRONMENTAL POLLUTION
·
2025
·
IF 7.3
Xinchao Chen,Jiajing Pan,Xin Huang,Hongtao Liu,Jun Zhang
Although sludge bioleaching has been widely applied for dewatering and heavy metal removal, its effects on the occurrence characteristics and property changes of microplastics remain largely unreported. This study aimed to evaluate the effects of bioleaching treatment on the occurrence characteristics, physicochemical properties, and Cd adsorption capacity of microplastics in sludge from two wastewater treatment plants. Microplastic abundance decreased significantly after bioleaching treatment from 1557 to 997 items/L and from 4117 to 1371 items/L in the two plants. The proportion of microplastics sized 50–200 μm decreased from 72.9 % to 47.4 % and from 40.0 % to 34.6 %. Fibrous microplastics remained the dominant form, with polypropylene and polyethylene as the main polymers. Energy dispersive X-ray spectroscopy analysis demonstrated surface aging, with the oxygen content increasing from 2.06 % to 22.14 % and the oxygen–carbon ratio increasing from 0.087 to 0.248. The isolated microplastics demonstrated enhanced Cd adsorption capacity, ranging from 1236 to 1797 μg/g, indicating that bioleaching-induced fragmentation creates additional adsorption sites. Overall, bioleaching alters microplastics occurrence and accelerates aging, thereby enhancing heavy-metal adsorption and offering insights into the environmental risks of sludge-borne MPs.
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FOOD CHEMISTRY
·
2023
·
IF 8.8
Lixin Kang,Qiufang Liang,Qayum Abdul,Arif Rashid,Xiaofeng Ren,Haile Ma
To prevent food spoilage caused by microbial infection, the development of an environmentally friendly antimicrobial preservation material is crucial. Here, the microporous γ-CD-MOFs was utilized to encapsulate the hydrophobic active substance curcumin, resulting in the preparation of a non-toxic antimicrobial material (Cur-CD-MOFs). The results revealed that curcumin encapsulation in Cur-CD-MOFs occurred primarily in the carbonyl group, benzene ring, and enolic side ring of curcumin. The Cur-CD-MOFs had a 100% bactericidal effect on Escherichia coli and Staphylococcus aureus at 4 h and 8 h, and a strong inhibitory effect on aerial mycelium of Penicillium expansum and Botrytis cinerea . Furthermore, the incorporation of Cur-CD-MOFs improved the Pul/Tre film barrier and mechanical properties. The effectiveness of Cur-CD-MOFs-Pul/Tre in retaining fruit freshness was validated using Centennial Seedless grapes. This study confirmed that Cur-CD-MOFs is a promising antibacterial material, and Cur-CD-MOFs-Pul/Tre will be a potent candidate for food preservation.
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Desalination and Water Treatment
·
2024
·
IF 1
Youning Chen,Shuang Jia,Wei Zhao,Juan Song,Yuhong Li,Huan Wang
A novel ethylenediamine chelating resin (PEDA-g-PS) was prepared by grafting poly (glycidyl methacrylate) onto the chloromethylated polystyrene beads via surface-initiated atom transfer radical polymerization (SI-ATRP), and followed by the ring-opening reaction of epoxy and amine groups. The resin was characterized by infrared spectroscopy, scanning electron microscopy and elemental analysis. The adsorption property for Cu(II) and Cd(II) on the resin was examined. By analyzing adsorption isotherm, adsorption kinetics and the influence of solution pH on the adsorption capacity, the adsorption of Cu(II) and Cd(II) on PEDA-g-PS resin was proved to be Langmuir single-layer adsorption model, and adsorption process conformed to pseudo-second-order kinetic equation. The maximum adsorption capacities for Cu(II) and Cd(II) could reach 1.19 and 1.95 mmol·g –1 at pH 3.0 by fitting Langmuir model. The adsorption of the Cu(II) and Cd(II) was hardly affected by common coexisting ions such as Na (I), K (I), Ca (II) and Mg (II), whereas they were slightly decreased when Fe (II) and Zn (II) coexisted in the solution, which illustrated the selective adsorption of Cu(II) and Cd(II) from wastewater. After ten adsorption–desorption cycles, the adsorption capacity of the resin did not change significantly, indicating that the resin exhibited excellent adsorption properties for heavy metal ions and excellent reusability.
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Arabian Journal of Chemistry
·
2021
·
IF 5.165
Hong-Xia Song,Ting Lei,Fang Wu,Xiaoyu He,Jiang Wang
This article has been retracted: please see Elsevier Policy on Article Withdrawal ( http://www.elsevier.com/locate/withdrawalpolicy ). This article has been retracted at the request of the Editor-in-Chief. In investigating concerns brought up regarding the authenticity of the article, the editors reached out to the corresponding author for an explanation. The authors failed to reply. The editors therefore feel that the findings of the manuscript cannot be relied upon and that the article needs to be retracted.
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INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2019
·Vol. 43
·期 8
·3284-3294
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IF 3.343
Xiaoyang Wan,Xuefeng Wei,Juan Miao,Ruichang Zhang,Jun Zhang,Qingshan Jason Niu
Summary A wide compositional range of Pd-Ni/Cd on polypyrrole (PPy)-modified Ti plates (Pd-Ni/Cd/PPy/Ti) was fabricated via electrochemical deposition. The hydrogen absorption properties of the prepared Pd-Ni/Cd/PPy/Ti electrodes were evaluated using cyclic voltammetry and chronoamperometry in acidic media. The optimal Pd 36 -Ni 7 /Cd 57 /PPy/Ti electrode achieved a hydrogen storage capacity of 331.3 mC cm −2 mg −1 and an H/Pd ratio of 0.77. The enhancement of the hydrogen storage was attributed to a synergistic effect between the Pd-Ni/Cd catalysts. The surface morphology, crystallinity, and chemical composition of the Pd-Ni/Cd/PPy/Ti electrode were characterized using scanning electron microscope (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS), respectively. Hydrogen spillover occurred on the trimetallic catalysts, and secondary hydrogen spillover occurred on the PPy/Ti support. The enhanced hydrogen sorption capacity was due to both the synergistic effect of the trimetallic catalysts and the assistance of PPy, making Pd-Ni/Cd/PPy/Ti a promising hydrogen storage material.
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Environmental Science-Advances
·
2023
·Vol. 2
·期 3
·495-507
·
IF 0
Yong Cheng,Lin Deng,Dan Wang,Xiuxiu Wang,Changchun Ji,Ying-Hua Zhou
In this work, CuS@Cu-CD composites were synthesized and employed as Fenton-like catalysts. CuS significantly enhanced the photodegradation activity of tetracycline (TC) when decorated with Cu-doped-carbon dots (Cu-CDs). The influence of initial pH, dosage of catalyst, and H2O2 concentration on the catalyst performance was investigated. Radical trapping experiments proved that ·O2− and h+ played critical roles and ·OH played a moderate role in the degradation of TC. Mechanism analyses demonstrated that Cu2+/Cu+ redox circulation could be accelerated by the introduction of Cu into carbon dots, which further facilitated H2O2 consumption and resulted in higher TC degradation efficiency.
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Journal of Water Process Engineering
·
2022
·
IF 7.34
Ying Wang,Haoyu Chen,Chao Chen,Zikun Zhang,Yin Xu,Guangjiao Chen,Yanlong Zhang
The anammox-HAP coupling process can simultaneously achieve high-efficiency nitrogen removal and phosphorus recovery from sewage. The composition and physical properties of the byproducts (aHAP) collected in the anammox-HAP process were analyzed. In addition, the application potential and mechanisms for Cd(II) adsorption by aHAP in wastewater were investigated. The results show that aHAP is mainly composed of hydroxyapatite and calcium carbonate , having granular structure with honeycombs and pores. The aHAP shows an adsorption capacity of 21.10–34.80 mg/g for Cd(II) removal, and the adsorption behavior is consistent with pseudo-second-order and intra-particle diffusion models, showing that the rate-limiting step is controlled by the chemical reaction of surface complexation, ion exchange, and precipitation. In addition, the remaining anammox biomass in aHAP can bind Cd(II). The aHAP also shows a pH buffer capacity when the initial pH ranges between 4.10 and 8.46, and the final pH can be stabilized in the range of 6.3 to 8.3, which is suitable for anammox reactions. Collectively, the anammox-HAP coupling process can not only be used to achieve high-efficiency nitrogen and phosphorus removal, but its aHAP byproduct shows good adsorption properties and pH buffering capacity, which meets the requirements of green chemistry and has high economic and environmental benefits.
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Laser & Photonics Reviews
·
2024
·
IF 9.8
Wei Liao,Xinquan Zhou,Jiance Jin,Yuzhen Wang,Zhiguo Xia
Thermochromic luminescent materials (TLMs) with spectral responsiveness to thermal stimuli have received broad attention due to the forefront applications in temperature visualization and sensing technologies. Herein, a phase diagram-driven strategy for designing TLMs in Cs–Cd–Br ternary system is presented. The room temperature stable Cs 7 Cd 3 Br 13 crystal is first obtained by utilizing a facile hydrothermal method, and the self-trapped exciton (STE) luminescence is improved by breaking local symmetry via Mg 2+ doping. Then thermochromic luminescence is further realized in Mn 2+ co-doped Cs 7 Cd 3 Br 13 on the basis of reversible structural transition to metastable Cs 2 CdBr 4 under thermal stimuli. The emission color change from bright yellow to green benefits from the variation of crystal fields around Mn 2+ , which can be switched by heating and cooling circulations. Finally, the resulting material is used as a demo to visualize the temperature of a homemade high-frequency induction heating sintering platform.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2015
·Vol. 15
·期 6
·4245-4254
·
IF 1.556
Li Yan,Xu Cong,Qiu Tianbao,Xu Xiaoyan
The Cd(II) ion imprinting electro-spun crosslinked chitosan nanofiber mats were successfully prepared using Cd(II) as template ions and glutaraldehyde (GA) as crosslinker to investigate the adsorption of Cd(II) and Pb(II) ions in aqueous solutions. The Cd(II) ion imprinting electro-spun
crosslinked chitosan nanofiber mats were characterized by the Fourier Transform Infrared Spectrometer (FTIR), Scanning Electron Microscope (SEM), Thermal Gravimetric Analysis (TGA), elemental analysis and solubility tests. The prepared chitosan nanofiber mats exhibited a higher adsorption
capacity for both Cd(II) (364.3 mg/g) and Pb(II) (272.0 mg/g) ions. The dynamic study demonstrated that the adsorption process followed the second-order kinetic equation. Langmuir and Freundlich adsorption models were used to analyze the equilibrium isotherm data. The results showed that the
Langmuir model was best suitable for predicting the adsorption isotherm of the studied system. The as prepared Cd(II) ion imprinting electro-spun crosslinked chitosan nanofiber mats might be used as an effective adsorbent for Cd(II) and Pb(II) removal from heavy metal wastewater.
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Foods
·
2025
·Vol. 14
·期 24
·4252
·
IF 5.1
Baoli Wang,Kai Tang,Feng Yang
Understanding the extent of cadmium (Cd) contamination and its impact on the food industry and ecosystems is crucial; to this end, electrochemical methods provide sensitive and rapid responses for the in situ detection of heavy metal ions. In this paper, a sensitive Cd2+electrochemical sensor was constructed by using a composite material composed of biomass-derived porous carbon and manganese dioxide (MnO2/KLSC). The composite was demonstrated to have a porous structure with quasi-cubic MnO2particles evenly distributed on the carbon matrix. Using MnO2/KLSC as the electrode material, a simple electrochemical sensing platform was fabricated for the detection of Cd2+. The electrochemical analysis showed that the Cd2+sensor has good performance, with a linear detection range of 0.01–80.0 μmol/L and a detection limit of 9.8 nmol/L. Furthermore, the sensor shows excellent repeatability, reproducibility, and good anti-interference. The sensor was successfully applied to analyze rice and sea water samples, demonstrating satisfactory recovery rates. The good performance of MnO2/KLSC/GCE can be attributed to the excellent electrical conductivity, enlarged active surface area, and good electron transfer capability.
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CHINESE JOURNAL OF STRUCTURAL CHEMISTRY
·
2022
·
IF 0.847
Fang-Min CHEN,Chi-Chi ZHOU,Xiong HE,Yan LI,Xiu-Qing ZHANG
ABSTRACT Two new 3-D Cd(II) coordination polymers with p -phthalic acid ( p -BDC) and 4,4΄-dipyridylamine (4,4΄-dpa), namely [Cd 2 ( p -BDC) 2 (4,4΄-dpa) 2 ] n 1 and {[Cd( p -BDC)(4,4΄-dpa) (H 2 O)]·4H 2 O} n 2 were successfully synthesized under hydrothermal conditions at 120 and 140 °C. They were characterized by single-crystal X-ray diffraction, IR, PXRD and TGA . It was further characterized by Hirshfeld surface (HS) analysis for complex 2 . The luminescent properties of the complexes have also been investigated.
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