Nanomaterials
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2019
·Vol. 9
·期 3
·455
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IF 4.034
Yuhao Zhao,Kai Xia,Zhenzong Zhang,Ziming Zhu,Yongfu Guo,Zan Qu
In order to avoid using toxic or harmful operational conditions, shorten synthesis time, enhance adsorption capacity, and reduce operational cost, a novel magnetic nano-adsorbent of CoFe2O4@SiO2with core–shell structure was successfully functionalized with polypyrrole (Ppy). The physical and chemical properties of CoFe2O4@SiO2-Ppy are examined by various means. The as-prepared CoFe2O4@SiO2-Ppy nanomaterial was used to adsorb Hg2+from water. During the process, some key effect factors were studied. The adsorption process of Hg2+onto CoFe2O4@SiO2-Ppy was consistent with the pseudo-second-order kinetic and Langmuir models. The Langmuir capacity reached 680.2 mg/g, exceeding those of many adsorbents. The as-prepared material had excellent regeneration ability, dispersibility, and stability. The fitting of kinetics, isotherms, and thermodynamics indicated the removal was endothermic and spontaneous, and involved some chemical reactions. The application evaluation of electroplating wastewater also shows that CoFe2O4@SiO2-Ppy is an excellent adsorbent for Hg2+ions from water.Keywords:adsorbent;polypyrrole;heavy metal;mercury;modification
研究领域:
环境科学
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材料科学
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PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2016
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IF 1.207
Xiaoxia Yao,Huicai Wang,Zhenhua Ma,Mingqiang Liu,Xiuqing Zhao,Dai Jia
A fast and selective adsorbent for Hg(II) from aqueous solutions using thiourea (TU) functionalized polypropylene fiber grafted acrylic acid (PP-g-AA), PP-g-AA-TU fibers, was characterized by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. The adsorption behavior of the functionalized chelating fibers for Hg(II) was investigated by static adsorption experiments, and the effects of some essential factors on adsorption of Hg(II) were examined, such as pH, initial concentration, adsorption time, coexisting cations, and temperature. The results showed that the adsorptive equilibrium could be achieved in 10 min, and the equilibrium adsorption quantity of PP-g-AA-TU fibers was 20 times that of PP-g-AA fibers. The PP-g-AA-TU fibers showed a very high adsorption rate and a good selectivity for Hg(II) over a wide range of pH. The adsorption isotherm can be well described with Langmuir model, with the maximum adsorption capacity for Hg(II) up to 52.04 mg·g − 1 and the removal of Hg(II) more than 97%. The kinetic data indicate that the adsorption process is best-fitted into the pseudo-second-order model.
研究领域:
环境科学
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材料科学
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2014
·Vol. 131
·期 18
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IF 1.64
Yan Zhou,Jianping Zhang,Xuegang Luo,Xiaoyan Lin
A novel adsorbent for Hg(II), mercapto-functionalized alkali lignin (AL-SH) was synthesized by Friedel–Crafts alkylation reaction and nucleophilic substitution reactions. The adsorbent was characterized by the techniques of Fourier transform-infrared spectroscopy (FT-IR), elementary analysis and thermogravimetric analysis, and N 2 adsorption techniques. The effect of various parameters on Hg(II) adsorption process such as initial pH, contact time, ionic strength, initial Hg(II) concentration, temperature, and adsorbent dosage were investigated in detail through batch static experiments. The results indicated that the adsorption process of Hg(II) on AL-SH was mainly dependent on the pH and the optimal pH value was at pH ranging from 4.0 to 6.0. The adsorption process was found to follow pseudosecond-order kinetics and the main process was chemical adsorption, which equilibrated at 8 h. The adsorption isotherm was better described by Langmuir and Temkin isotherm equations compared to Freundlich isotherm equation and the maximum adsorption capacity obtained was 101.2 mg g −1 (pH = 4.0, 20°C, initial Hg(II) concentration was 200 mg L −1 ). The thermodynamic parameters of and were positive while was negative, revealed that the adsorption of Hg(II) onto AL-SH was a spontaneous and endothermic process with increased entropy. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 40749.
研究领域:
环境科学
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材料科学
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高影响因子
LANGMUIR
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2022
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IF 4.331
Xiaoyu Lou,Xiaoyan Chen,Duanlian Tang,Qiong Wang,Yukun Tian,Menghan Tu,Yupeng Wang,Changshen Ye,Jie Chen,Ting Qiu
Hierarchical porous carbons equipped with heteroatoms and diffusion pores have a wide application prospect in adsorption. Herein, we report N-autodoped porous carbons (PTPACs), which were derived from rigid N-rich conjugated microporous poly(aniline)s (CMPAs) and show their all-around applicability in heavy metal adsorption. Their molecular structure could be delicately tuned from 3D organic networks to graphitic carbons through simply adjusting the pyrolysis temperature, affording unique hybrid features of hierarchical micro-meso-macroporosity and amount-tunable nitrogen defects, as validated by the enhanced CO2 adsorption capacities reaching 5.0 mmol g–1, a 230% increase compared to the precursor (2.15 mmol g–1). They therefore show promising a Langmuir adsorption capacity of 434.8 mg g–1 toward mercury ions, which could be rapidly achieved within a short 20 min. Based on the comprehensive experimental, characterization, and DFT calculation studies, we rationally reveal these impressive adsorptions arise from the hybrid function of chemisorption contributed by populated nitrogen defects and physical adsorption achieved by synergistic functions in the diffusion and storage pores. Outcomes mark the high merits of PTPACs in addressing recent global challenges in environmental engineering.
研究领域:
环境工程
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材料科学
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PubMed
高影响因子
DESALINATION
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2026
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IF 9.9
Yu Sun,Wenqing Jin,Qunhua Zhou,Hanyu Li,Jiwei Wang,Jianshe Hu
Mercury pollution poses severe threats to ecosystems and human health, driving the need for efficient adsorbents. Herein, three new covalent organic frameworks (TPA-PB COF, TPA-PT COF and TDC-PT COF) were designed and synthesized via condensation polymerization, incorporating both nitrogen and sulfur heteroatoms to enhance Hg(II) affinity. Comprehensive characterization identified TDC-PT COF as the optimal material, possessing significant heteroatom loadings (N: 12.40 wt%, S: 7.12 wt%), and a unique walnut-kernel morphology. Accordingly, TDC-PT COF showed the highest Hg(II) adsorption capacity (739.5 mg/g), followed by TPA-PT COF (575.1 mg/g) and TPA-PB COF (436.3 mg/g). Furthermore, this superior capacity was accompanied by rapid adsorption kinetics, a high removal rate of 99.9% meeting the drinking water standard, equilibrium within 40 min, and excellent selectivity. The adsorption of TDC-PT COF adhered to the pseudo-second-order kinetic model and the Langmuir isotherm, suggesting that the process is dominated by chemisorption with monolayer adsorption. Thermodynamic analysis revealed spontaneous and endothermic adsorption characteristics. X-ray photoelectron spectroscopy combined with density functional theory calculations confirmed that the primary mechanism involves Hg(II) coordination with N and S sites, where electron-withdrawing effects strengthening the interaction. The adsorbent retained over 95% of its original capacity after five regeneration cycles. This work establishes a series of isostructural COFs via controlled bottom-up molecular design, enabling a systematic investigation of the individual and cooperative roles of N and S sites in Hg(II) binding, and thereby providing a clear structure-function basis for the rational design of high-performance Hg(II) adsorbents.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
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IF 7.7
Zhiying Shao,Xiaoyi Jiang,Qinlu Lin,Simiao Wu,Siming Zhao,Xinyang Sun,Yunhui Cheng,Yong Fang,Peng Li
The presence of potentially toxic elements and compounds poses threats to the quality and safety of fruit juices. Among these, Hg(II) is considered as one of the most poisonous heavy metals to human health. Traditional chitosan-based and selenide-based adsorbents face challenges such as poor adsorption capacity and inconvenient separation in juice applications. In this study, we prepared nano‑selenium functionalized chitosan gel beads (nanoSe@CBs) and illustrated the synergistic promotions between chitosan and nanoSe in removing Hg(II) from apple juice. The preparation conditions, adsorption behaviors, and adsorption mechanism of nanoSe@CBs were systematically investigated. The results revealed that the adsorption process was primarily controlled by chemical adsorption. At the 0.1 % dosage, the adsorbent exhibited high uptake, and the maximum adsorption capacity from the Langmuir isotherm model could reach 376.5 mg/g at room temperature. The adsorbent maintained high adsorption efficiency (> 90 %) across a wide range of Hg(II) concentrations (0.01 to 10 mg/L) and was unaffected by organic acids present in apple juice. Additionally, nanoSe@CBs showed negligible effects on the quality of apple juice. Overall, nanoSe@CBs open up possibilities to be used as a safe, low-cost and highly-efficient adsorbent for the removal of Hg(II) from juices and other liquid foods.
研究领域:
食品科学
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环境科学
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PubMed
高影响因子
Desalination and Water Treatment
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2024
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IF 1
Xuyin Lin,Jinwen Jiang,Jun Wang,Jiaofen Lin,Aikebaier Reheman
ABSTRACT In this study, we used mesoporous silica materials as inorganic carrier and poly(o-phenylenediamine) with more active amino and imino groups as organic ligand to obtain functionalized adsorbent. The composite adsorbent poly(o-phenylenediamine) modified mesoporous composites (MPP) were prepared by loading poly(o-phenylenediamine) onto the surface of the aminated mesoporous material through in-situ polymerization. It was found that the maximum saturation adsorption capacity of MPP reached 225 mg/g when the solution pH, temperature, initial Hg(II) concentration, and adsorption time were 4, 298.15 K, 100 mg/L, and 240 min, respectively. When common interfering ions Zn(II), Ni(II), Cu(II), Ca(II), Mg(II) and Al(III) were present, the adsorption of Hg(II) by MPP still showed good selectivity. The adsorption of Hg(II) by MPP followed quasi-secondary kinetics and the Langmuir adsorption isotherm model, indicating that the adsorption process was chemisorption. In addition, MPP removed up to 81.35% of Hg(II) from industrial wastewater. After five cycles for adsorbent regeneration experiments, the adsorption capacity of MPP could reach 191.67 mg/g, indicating that the adsorbent has good regeneration performance and potential application value for removal of Hg(II).
研究领域:
环境科学
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材料科学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2018
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IF 3.909
Bo Li,Ming Li,Jinyao Zhang,Yuanfeng Pan,Zhihong Huang,Huining Xiao
The diethylenetriaminepentaacetic acid (DTPA)-modified cellulose adsorbent was prepared using N ‑[3‑(trimethoxysilyl)propyl]ethylenediamine as a crosslinking reagent and used for the removal of Hg (II) ions from aqueous solution. The resulting adsorbents were comprehensively characterized with FTIR, XRD and SEM. The results showed that DTPA successfully functionalized cellulose, and coordinating DTPA ligand improved the binding properties towards heavy metal ions significantly. Various influencing factors on adsorption performance were investigated, including temperature, initial concentration of Hg (II), solution pH, contact time. Moreover, the reusability of the adsorbent was also assessed. The experimental and modeling results indicated that the adsorption process was better described by Langmuir isotherm model, and the maximum adsorption capacity reached as high as 476.2 mg·g −1 , The kinetic date of the adsorption matched well with the pseudo-second-order kinetic model. Furthermore, the cellulose-based adsorbent is reusable, maintaining the adsorption capacity after seven adsorption-desorption cycles. The findings from this work demonstrated that the DTPA-modified cellulose adsorbent can be recognized as an effective adsorbent for Hg (II) removal from aqueous solution.
研究领域:
环境科学
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材料科学
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Zimo Wang,Yaohan Chen,Li Wang,Jifu Zheng,Yong Fan,Suobo Zhang
The development of new adsorbent materials to improve adsorption capacity and selectivity constitutes a significant research direction for removing toxic ions from water. In this study, a series of Zr-based metal–organic framework hierarchical porous nanofibre membranes (MOFs@PIM-W) was designed and successfully synthesised, and their adsorption properties and mechanism for fluoride ions in water were investigated. The formation of Zr–F bonds in Zr-based MOFs is a primary reason for the rapid, effective, and stable removal of fluoride ions from water. Moreover, in contrast to common powder adsorbents and the conventional static adsorption process, the obtained hierarchical porous nanofibre membranes improve the removal rate of fluoride ions, which may be attributed to the formation of hierarchical porous structures. Specifically, by modifying the types of MOFs, the obtained nanofibre membranes can effectively remove Hg(II) ions from water under a wide range of pH environments (pH = 2–10) with a removal rate of up to 99 %. This indicates that the hierarchical porous design of nanofibre membranes incorporated with their specific adsorption provides a viable option for rapidly and efficiently removing toxic ions from water.
研究领域:
环境科学
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材料科学
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水处理
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纳米技术
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高影响因子
RSC Advances
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2025
·Vol. 15
·期 37
·30456-30465
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IF 4.6
Jiangpeng Tang,Chang-ye Hui,Shunyu Hu,Wanyan Wu,Peishuo Cao,Jingwen Ling,Xueqin Yang,Zhenlie Huang,Yan Guo
Rapid, low-cost trace inorganic Hg(II) detection in environmental waters remains a critical public-health challenge. Here, we engineered Escherichia coli into a naked-eye whole-cell biosensor by coupling a redesigned MerR-Pmer element to the pyomelanin biosynthetic pathway. Three 4-hydroxyphenylpyruvate dioxygenase (HppD) homologs from Aeromonas media WS, Aeromonas hydrophila 4AK4, and Pseudomonas aeruginosa PAO1 were codon-optimized and functionally screened. The sensor strain of TOP10/pHg-PAO1 exhibited the broadest quantitative range (4.9–1250 nM) and the lowest detection limit (1.2 nM), outperforming most fluorescent counterparts. The water-soluble red-brown pyomelanin product was measured directly in the culture supernatants by absorbance at 400 nm, without requiring extraction. It remained chromogenically stable for at least 14 hours. The biosensor demonstrated absolute selectivity for Hg(II) in the presence of other ions, including Mg(II), Ca(II), Cd(II), Mn(II), Cu(II), Pb(II), and Zn(II), all at a concentration of 5 μM. It retained quantitative accuracy in tap, lake, and coastal seawater matrices. These features enable on-site, equipment-free screening of environmental waters and establish pyomelanin as a robust, user-friendly chromogenic reporter for next-generation whole-cell sensors.
研究领域:
环境科学
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合成生物学
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生物传感器
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微生物工程
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分析化学
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DOI
PubMed
高影响因子
Water
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2025
·Vol. 17
·期 6
·885
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IF 3
Qunhua Zhou,Yu Sun,Ziye Li,Siqin Sun,Jianshe Hu,Zhangpei Chen,Aikebaier Reheman
Chitosan (CS) and polyvinyl alcohol (PVA) nanofiber membranes were synthesized via electrospinning and used as supporting materials for powdered porous organic polymer (POP). These membranes were then crosslinked with glutaraldehyde, resulting in nanofiber membranes (CS/PVA/POP) as an efficient adsorbent for Hg(II) ions. Characterization using Fourier transform infrared spectroscopy, X-ray diffraction, and scanning electron microscopy showed that the membranes effectively removed up to 92.9% of mercury ions at optimal conditions, with an adsorption capacity of 116.1 mg/g. The adsorption data fit well with the Langmuir isotherm and pseudo-second-order kinetic models. The efficient uptake of mercury ions was attributed to chemisorption involving active groups (C=S, -NH2, -OH), facilitated by mechanisms such as chelation, complexation, or electron exchange. TheCS/PVA/POPnanofiber membranes demonstrated significant advantages in adsorption capacity, economic viability, and recyclability, providing an effective solution to mercury pollution in water.
研究领域:
环境科学
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材料科学
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高影响因子
CHEMOSPHERE
·
2019
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IF 5.108
Guo Lin,Tu Hu,Shixing Wang,Tingfang Xie,Libo Zhang,Song Cheng,Likang Fu,Chao Xiong
Removal of Hg(II) from wastewater was beneficial to satisfy the discharge standards of China's mercury-containing wastewater (50 ppb). An adsorbent was prepared via modifying corn husk leaves with bismuthiol I. The results revealed that the mercury removal rate was more than 98.5% at pH 1.0–7.0. Moreover, the removal rate reached 96% at 5 min and the residual concentration decreased from 10 ppm to approximately 30 ppb. In addition, the adsorbent owned a conspicuous selective absorbability for trace Hg(II) from wastewater. The adsorption process followed a Hill isotherm model. The actual saturated adsorption quantity of the adsorbent was 707 mg/g. The repeatability experiment indicated that the mercury removal efficiency was still beyond 99% after three cycles. The X-ray photoelectron spectroscopy suggested that the main adsorption mechanism was chelation between nitrogen/sulfur groups and Hg(II). The adsorbent was hopeful to remove mercury from wastewater in a sustainability perspective.
研究领域:
环境科学
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材料科学
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PubMed
高影响因子
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