POWDER TECHNOLOGY
·
2023
·
IF 5.2
Duanlian Tang,Xiaoying Lyu,Zhixian Huang,Renwei Xu,Jie Chen,Ting Qiu
Nitrogen-doped microporous carbon, which features a uniquely tunable porosity, exhibits promisingly high adsorption prospects in the greenhouse gas capture and water treatment. Herein, we propose a series of novel N-doped microporous carbons (CMPA n -C1000), and precisely tune their porosities via a direct pyrolysis of rigid conjugated microporous poly(aniline)s (CMPA n , n = 1, 2, 3) with pore size difference in a molecular level, as achieved by simply tuning their linkers with varying sizes, planarity, and symmetry. The CMPA3-C1000, with a satisfactory amount of nitrogen heteroatoms , high S BET of ∼800 m 2 g −1 , and large ultra-micropore volume of 0.25 cm 3 g −1 , has excellent CO 2 capture ability ( i.e. , 5.1 mmol g −1 at 273 K, 1 atm) and Hg(II) adsorption performance ( i.e. , Q e = 571 mg g −1 ; k 2 = 0.0031 g mg −1 min −1 ), respectively. CMPA3-C1000 might perform chemisorption towards Hg(II), according to calculations using density functional theory and experimental data; nitrogen atoms in porous carbon contributed to this excellent Hg(II) adsorption.
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CHEMOSPHERE
·
2019
·
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.
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MICROCHEMICAL JOURNAL
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2018
·
IF 2.746
Junhui He,Xi Wu,Zhou Long,Xiandeng Hou
A porphyrinic metal-organic framework, PCN-222, was employed for the fast and sensitive determination of cysteine (Cys) based on its fluorescence (FL) property. A “turn-on” sensor was easily established based on the instant metalation of PCN-222 with Hg 2+ , and the sensing for Cys primarily derived from the strong binding between Hg and Cys, with the PCN-222 FL fast recovered via the rapid and efficient release of Hg. A more than two orders of magnitude in the linear dynamic range and a limit of detection as low as 60 nM were obtained by using the proposed method based on FL measurement. In particular, the sensing could also be accomplished in a visual manner, with the color change of Hg-metalated PCN-222 easily observed by naked eyes upon the addition of Cys as low as 100 nM. The proposed strategy for Cys sensing also showed advantages including facile preparation and cyclic usage of the probe, fast response (1 min) to Cys, high sensitivity for both FL and visual sensing, and no extra additives such as catalysts nor chromogenic substrates.
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Journal of the Taiwan Institute of Chemical Engineers
·
2015
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IF 3
Zhuoxing Wang,Jiang Xu,Yunjun Hu,Heng Zhao,Junliang Zhou,Yu Liu,Zimo Lou,Xinhua Xu
A selective adsorbent for Hg(II) was prepared by coating Fe 3 O 4 nanoparticles with SiO 2 which was further functionalized with thiol (–SH) group. The new adsorbent (Fe 3 O 4 @SiO 2 -SH) was shown to adsorb aqueous Hg(II) species in a wide range of pH (1.0–8.0) conditions. The Hg(II) adsorption capacity q e was more than 90.0 mg g −1 at pH > 3.0, and was slightly decreased to 84.6 mg g −1 under strong acidic conditions due to the electrostatic repulsion. The Langmuir isotherm model fitted the adsorption data better than the Freundlich, Temkin, and Dubinin-Radushkevich isotherms models. The maximum adsorption capacity of Fe 3 O 4 @SiO 2 -SH for Hg(II) was 132.0 mg g −1 . The adsorption kinetics were shown to follow the pseudo-second-order kinetic model, and the kinetic constant k 2 was 2.4 × 10 −3 g mg −1 min −1 . The magnetic retrieve of the newly-developed adsorbent was easily carried out via an external magnetic field, enabling both excellent adsorbent utilization and adsorption efficiency at high Hg(II) concentrations.
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Water
·
2025
·Vol. 17
·期 6
·885
·
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.
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RSC Advances
·
2025
·Vol. 15
·期 37
·30456-30465
·
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.
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WATER SCIENCE AND TECHNOLOGY
·
2016
·Vol. 74
·期 12
·2946-2957
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IF 1.064
Wang Shixiang,Liu Yong,Fan Qin,Zhou Anlan,Fan Lu,Mu Yulan
An environmental friendly and economic natural biopolymer-sodium humate (HA-Na) was used to capture Hg(II) from aqueous solutions, and the trapped Hg(II) (HA-Na-Hg) was then removed by aluminium coagulation. The best Hg(II) capturing performance (90.60%) was observed under the following conditions: initial pH of 7.0, coagulation pH of 6.0, HA-Na dosage of 5.0 g L −1 , Al 2 (SO 4 ) 3 .18H 2 O dosage of 4.0 g L −1 , initial Hg(II) concentration of 50 mg L −1 and capturing time of 30 min. The HA-Na compositions with the molecular weight beyond 70 kDa showed the most intense affinity toward Hg(II). The results showed that the reaction equilibrium was achieved within 10 min (pH 7.0), and could be well fitted by the pseudo-second-order kinetics model. The capturing process could be well described by the Langmuir isotherm model and the maximum capturing capacity of Hg(II) was high up to 9.80 mg g −1 at 298 K (pH 7.0). The Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) analysis showed that the redox reaction between Hg(II) and HA-Na and the coordination reaction of carboxyl and hydroxy groups of HA-Na with Hg(II) were responsible for Hg(II) removal. The successive regeneration experiment showed that the capturing efficiency of humates for Hg(II) was maintained at about 51% after five capture-regeneration recycles.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Xin Yan,Huacai Ge
In this study, a novel modified chitosan composite adsorbent (UNCS) was prepared by crosslinking between chitosan and metal organic frameworks (MOFs) material UiO-66-NH 2 using epichlorohydrin as crosslinker. The influence of the prepared conditions was investigated. The structure and morphology of the composite were characterized by FT-IR, XRD, SEM, TGA, BET and zeta potential analysis. Effects of different variables for adsorption of Hg(II) on this adsorbent were explored. The kinetic studies indicated that the adsorption process followed the pseudo-second-order kinetic model and the adsorption equilibrium could be reached within 2 h. The adsorption was mainly controlled by chemical process. Adsorption isothermal studies illustrated that the adsorption fitted Langmuir isotherm model, implying the homogeneous adsorption on the surface of the adsorbent. The adsorbent exhibited high uptake and the maximum capacity from Langmuir model could reach 896.8 mg g −1 at pH 6. Thermodynamic studies showed the spontaneous nature and exothermic nature of the adsorption process. Additionally, the removal of Hg(II) on UNCS could achieve over 90 %. The adsorption-desorption cycled experiments indicated the appropriate reusability of the adsorbent. Hence, this adsorbent would be promising for the removal of Hg(II) from wastewater.
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Journal of Water Process Engineering
·
2022
·
IF 7.34
Xu Chai,Huaqi Dong,Zenggao Zhang,Zhaoyang Qi,Jie Chen,Zhixian Huang,Changshen Ye,Ting Qiu
Due to natural and production activities, mercury contamination has become one of the major environmental problems in the world. Adsorption is one of the important means to solve this problem. However, most of the commercially available adsorbents exhibit relatively low adsorption capacity and slow kinetics. Therefore, a novel 4,6-diamino-2-mercaptopyrimidine-functionalised Zr-based metal-organic framework (UiO-66-DMP) was synthesised in this study. The UiO-66-DMP was characterised through X-ray diffraction, scanning electron microscopy, energy dispersive spectrometry , X-ray photoelectron spectroscopy, Fourier-transform infrared spectrometry, and thermogravimetric analysis . The potential of the UiO-66-DMP as a superior adsorbent for Hg(II) removal and the corresponding mechanisms were evaluated through batch experiments under different conditions and density functional theory calculations. Benefitting from its high specific surface area and multiple adsorption sites, the maximum Hg(II) adsorption capacity achieved in this study was 822.00 mg·g-1, which is the highest Hg(II) adsorption capacity reported to date. In addition, under the interference of Ca(II), Cd(II), Co(II), Mg(II), Mn(II), Ni(II), Cr(III), Cu(II), Zn(II) and other coexisting ions, the UiO-66-DMP could still maintain the high selective adsorption capacity for Hg(II). According to the characterization analysis and DFT calculation results, the adsorption of Hg(II) onto the UiO-66-DMP was dependent on electrostatic and covalent interactions between metal ions and abundant functional groups on the UiO-66-DMP surface.
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CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Congwei Li,Lian Duan,Xinjian Cheng
Fluorescent chitosan-based hydrogel for the selective detection and adsorption of Hg 2+ /Hg + in aqueous environment was prepared through three-step synthesis strategy. NO 2 -Boron-dipyrrolemethene (BODIPY) was prepared firstly, and then the -NO 2 group was reduced to -NH 2 group. Finally, the NH 2 -BODIPY was introduced to chitosan by Schiff base formation reaction through bi-aldehyde. Eventually, fluorescent chitosan hydrogel was obtained. The as-prepared fluorescent hydrogel probe could detect Hg 2+ /Hg + through PET mechanism with the detection limit of 0.3 μM. The recognition site which combines Hg 2+ /Hg + is C N, it is just formed in the reaction with chitosan and the amino group on BODIPY. Adsorption capacity of the fluorescent hydrogel is 121 mg·g −1 , which is almost seven times of the original chitosan. The isotherm and kinetics of Hg 2+ /Hg + removal follows Langmuir isotherm and pseudo-second order kinetics , respectively. Besides, a series of fluorescent hydrogels were prepared to compare the elasticity, hydropHilicity , fluorescence intensity and adsorption capacity.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Kun Jia,Keyu Yi,Weixi Zhang,Penghua Yan,Shuai Zhang,Xiaobo Liu
Because of its strong toxicity to the ecosystem and human beings, mercury is regarded as one of the most hazardous heavy metals . Among various fluorescent sensors that have been designed for Hg (II) detection, the probes showing Hg (II) concentration dependent ratiometric fluorescent responses normally exhibited improved analytical performance. Herein, we have synthesized series of amphiphilic polyurethane (PU) to encapsulate hydrophobic fluorescent quantum dots (QD) via the emulsion confinement self-assembly, leading to generation of QD@PU colloids whose red emission can be selectively quenched by Hg (II) among other metal ions . In order to further improve the Hg (II) detection performance of QD@PU probe, the green emitting carbon nanodots (CD) were synthesized and conjugated with QD@PU, resulting to formation of CD-QD@PU colloidal probe showing ratiometric fluorescent response towards Hg (II), which finally contributed to an enhanced sensitivity and wider linear range for Hg (II) detection. More interestingly, both QD@PU and CD-QD@PU doped stretchable PU membranes still hold naked eye discrimination for Hg (II). Basically, the current work revealed a universal protocol to prepare fluorescent probe for Hg (II) detection using PU and low dimensional fluorescent nanoparticles as building blocks, which will open new way for design and fabrication of other advanced sensors and analytical devices.
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Frontiers in Chemistry
·
2021
·
IF 5.221
Geng Xue,Qu Rongjun,Kong Xiangyu,Geng Shengnan,Zhang Ying,Sun Changmei,Ji Chunnuan
Dendrimers as commonly used metal ions adsorption materials have the advantages of good adsorption performance and high reuse rate, but the high cost limits its extensive use. Compared with dendrimers, hyperbranched dendrimers have similar physical and chemical properties and are more economical. Therefore, hyperbranched dendrimers are more suitable for industrial large-scale adsorption. The hyperbranched polyamidoamine (HPAMAM) gels were prepared by cross-linking hyperbranched polyamidoamine (HPAMAM-ECH-x and HPAMAM-EGDE-x) with different amounts of epichlorohydrin (ECH) and ethylene glycol diglycidyl ether (EGDE), respectively. The as-synthesized adsorbents were characterized by FT-IR, SEM and XPS. The prepared adsorbents were used to adsorb Hg(Ⅱ) in aqueous solution, and the effects of solution pH, contact time, temperature and initial concentration of metal ion on the adsorption capacity were investigated. The effect of solution pH indicated that the optimum condition to Hg(Ⅱ) removing was at pH 5.0. The adsorption kinetic curves of the two kinds of materials were in accordance with the pseudo-second-order model. For the HPAMAM-ECH samples, the adsorption thermodynamic curves fitted the Langmuir model, while for the HPAMAM-EGDE samples, both Langmuir and Freundlich equations fitted well. The maximum adsorption capacity of HPAMAM-ECH-3 obtained from Langmuir model toward Hg(Ⅱ) was 3.36 mmol/g at pH 5.0 and 35°C.
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