JOURNAL OF SOLID STATE CHEMISTRY
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2023
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IF 3.3
Jinlong Shi,Mengran Sun,Chunxiao Li,Jiyong Yao
A new polyselenide, Ba 2 HgSe 5 has been synthesized via conventional high-temperature solid state reaction . Single-crystal X-ray diffraction experiment reveals that the title compound crystallizes in the centrosymmetric space group Pnma of the orthorhombic system with a = 12.7123(7) Å, b = 8.9593(5) Å, c = 8.5470(5) Å and Z = 4. Its crystal structure consists of isolated dumbbell-shaped (HgSe 2 ) 2- and V-shaped Se 3 2− ions. These molecular anions are charge-balanced by Ba 2+ . Diffuse reflectance spectrum demonstrates the semiconducting properties with a direct band gap of 1.75 eV. Electronic band structure calculation indicates that the band gap is defined by the 4 p -orbitals of the selenium atoms of the Se 3 2− groups. Moreover, the photocatalytic behavior of the polycrystalline sample was investigated by decomposing antibiotics tetracycline hydrochloride under visible right irradiation and the result indicates that the title compound displays moderate degradation rate of 60 % within 2 h. In addition, thermal analysis shows that Ba 2 HgSe 5 has a good thermal stability up to 640 °C and exhibits incongruent melting behavior. These characteristics imply that Ba 2 HgSe 5 may be a fascinating photoelectronic material and has potential applications in the future.
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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.
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WATER RESEARCH
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2014
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IF 5.323
Chao Shan,Zhiyao Ma,Meiping Tong,Jinren Ni
Fe 3 O 4 @SiO 2 magnetic nanoparticles modified by grafting poly(1-vinylimidazole) oligomer (FSPV) was fabricated as a novel adsorbent to remove Hg(II) from water. Fourier transform infra-red spectroscopy confirmed the successful grafting of oligomer , and thermogravimetric analysis showed FSPV had a high grafting yield with organic content of 22.8%. Transmission electron microscopy image displayed that FSPV particles were polymer-coated spheres with size of 10–20 nm. With saturation magnetization of 44.7 emu/g, FSPV particles could be easily separated from water with a simple magnetic process in 5 min. The Hg(II) adsorption capacity of FSPV was found to be 346 mg/g at pH 7 and 25 °C in 10 mM NaCl. Moreover, the removal of Hg(II) by FSPV was not obviously affected by solution pH (from 4 to 10) or humic acid (up to 8 mg/L as TOC). The presence of seven common ions including Na + , K + , Ca 2+ , Mg 2+ , Cl − , NO 3 − , and SO 4 2 − (up to 100 mM ionic strength) slightly increased the adsorption of Hg(II) by FSPV. X-ray photoelectron spectroscopy analysis revealed that the N atom of the imidazole ring was responsible for the bonding with Hg(II), whereas the bonding of Hg with N did not result in cleavage of Hg–Cl bond in HgCl 2 and HgClOH. The regeneration of Hg(II)-loaded FSPV could be achieved with 0.5 M HCl rapidly in 10 min, and the removal of Hg(II) maintained above 94% in five consecutive adsorption–desorption cycles. Therefore, FSPV could serve as a promising adsorbent for Hg(II) removal from water.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
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.
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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).
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Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 19
·5024-5031
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IF 7.779
Mengran Sun,Jiyong Yao
In this work, Ba2HgTe5, as the first compound identified in the Ba/Hg/Te system, has been successfully synthesized via a solid-state reaction. It crystallizes in the orthorhombic space group pnma and exhibits a 0D structure composed of linear [HgTe2] units and V-shaped [Te3] units arranged in an alternating manner. The experimental and theoretical calculation results indicate that Ba2HgTe5 is a potential IR birefringent material, possessing a moderate band gap (1.28 eV), giant optical anisotropy (Δncal = 0.643@2090 nm), a low melting point (576 °C), and congruent-melting behavior. The results of the structure–property relationship reveal that the band gap of Ba2HgTe5 is primarily defined by the Te p orbitals in the [Te3] unit. Further, the analysis of the response electron distribution anisotropy (REDA) illustrates that the large birefringence of Ba2HgTe5 is induced mainly from the linear [HgTe2] unit (about 90% contribution). This work demonstrates for the first time the rationality of the [HgTe2] group as the gene for designing IR birefringent materials.
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Frontiers in Microbiology
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2026
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IF 5.8
Fanchao Meng,Ulf Skyllberg,Yangyang Li,Shusaku Hayama,Erik Björn,Yu Song
Mercury (Hg) is a global environmental concern due to its microbial conversion to methylmercury (MeHg), a potent neurotoxin that bioaccumulates in food webs and poses risks to ecosystems and human health. Thiol functional groups (RSH) play an important role in controlling Hg(II) speciation and bio-uptake in methylating bacteria, yet the spatial distribution and density of these thiols within cells remain largely unknown. We isolated subcellular fractions of the Hg methylating bacterium Geobacter sulfurreducens in the exponential growth phase, and used Hg L III -edge EXAFS (Extended X-ray Absorption Fine Structure) to quantify thiols in the extracellular medium, inner and outer membranes, periplasm and cytoplasm. The whole-cell thiol content was determined to be 1.3 × 10 −10 μmol cell −1 . The inner membrane contributed 7.1 × 10 −11 (53%), the outer membrane 1.2 × 10 −11 (9%), the periplasm 3.6 × 10 −11 (27%) and the cytoplasm 1.5 × 10 −11 μmol cell −1 (11%). The extracellular fraction contributed an additional 5.7 × 10 −11 μmol cell −1 , corresponding to 30% of the thiols of the cell culture. Local thiol density (thiols normalized to TOC in individual compartment, RSH/TOC, μmol g −1 C) was 36, 450, 140, 600 and 29 μmol g −1 C in the cytoplasm, inner membrane, periplasm, outer membrane and extracellular fractions, respectively. EXAFS analyses demonstrate Hg-thiolate coordination across all compartments, with Hg-O/N bonding and elemental Hg 0 formed at higher Hg loadings. In the periplasm, Hg-disulfide and traces of β -HgS were detected. The high thiol density at the membranes, relative to other compartments, may imply they have an important role in the retention and internalization of Hg(II). Periplasmic thiols may modulate Hg(II) transfer between membranes, and cytoplasmic thiols may regulate the intracellular availability of Hg(II) for methylation. This work provides the first compartment-resolved quantification of thiol abundances and densities in a model Hg-methylating bacterium at subcellular level, offering a mechanistic framework for understanding the speciation, bioavailability, and subcellular transformation of Hg(II) with relevance for other soft metals (e.g., Cd, Pb, Zn, Ag, and Cu).
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CATALYSIS TODAY
·
2026
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IF 5.1
Yao Nian,Tiantong Zhang,Linfeng Li,Xinyuan Wang,Dingqiang Feng,Jinli Zhang,You Han
The industrial hydrochlorination of acetylene to vinyl chloride monomer (VCM) remains constrained by the indispensable yet environmentally hazardous mercury chloride catalyst. To date, the exceptional activity and long‑term stability of mercury‑based systems have hindered their replacement. Inspired by the performance of mercury-based catalysts, we rationally engineered an environmentally benign and cost‑effective copper‑based alternative. Compared to copper species, the weaker intermolecular interactions and appropriate activation ability of acetylene towards mercury-based catalysts underpin the superior activity and stability. To mimic these traits, coordinating ligands are applied to tune the geometry and electronic structure of copper sites, resulting in increasing the reaction order of acetylene and augmenting the number of accessible active sites. After reaching a plateau in ligand‑mediated strategy, dispersed copper species are achieved by utilizing a defect support to inhibit the aggregation. The designed copper catalyst achieves the deactivation rate of 0.018 % per hour in a 400-hour stability test, which is comparable to the performance of mercury-based catalysts. This work provides a general principle for balancing site dispersion, electronic modulation and support engineering for designing an effective catalyst.
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CHEMOSPHERE
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2022
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IF 8.943
Rui Zhao,Xiufeng Cao,Xinxin Li,Tao Li,Hong Zhang,Xiaowei Cui,Zhaojie Cui
This study aimed to investigate the combined ecotoxicological effects of Cd, Pb, Zn, Hg and regulation mechanisms in Solanum nigrum L. In this work, the co-exposure of these four heavy metals hindered the transformation of Cd, Zn, and Hg (except Pb) from available to non-available chemical forms. Individual Cd, Pb, Zn and Hg induced the oxidative damages to S. nigrum L., while their combination further enhanced this ecological toxicity. By internal regulation, the ecological toxicity of metals to S. nigrum L. could be alleviated to a certain extent. Specifically, S. nigrum L. was a hyperaccumulator of Cd with BCF ＞1. Moreover, since BCFroot of Pb, Zn and Hg were all greater than BCFshoot, S. nigrum L. could accumulate Pb, Hg and Zn mainly in plant roots, which was beneficial for the detoxification of plants. Meanwhile, the immobilization by cell wall (the proportions of Cd, Pb, Zn and Hg in the cell wall were 54.46–84.92%, 38.33–49.25%, 48.38–56.19% and 45.97–63.47% in low metal concentration treatments) and the sequestration in vacuole (the proportions of Cd, Pb, Zn, and Hg in the soluble fractions are 50.99–59.00%, 41.05–45.46%, 37.54–61.04% and 33.47–61.35% in high metal concentration treatments) also act as important detoxification pathways. The external regulation was mainly the changes of soil microbial communities influenced by plants. Specifically, the richness and diversity of bacteria in rhizosphere soil were increased, and roots of S. nigrum L. recruited some potentially beneficial microbials. This study provided a theoretical basis and guidance for S. nigrum L. as a phytoremediation plant under combined heavy metal pollution.
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POWDER TECHNOLOGY
·
2023
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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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Frontiers in Nutrition
·
2022
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IF 6.59
Hong Tao,Zhao Jiaying,Yin Junyi,Nie Shaoping,Xie Mingyong
Tea is a popular beverage with a long history of safe and healthy use. Tea polysaccharide is a bioactive component extracted from tea, which has attracted more and more attention in recent decades. In this article, an acidic polysaccharide Gougunao tea polysaccharide (GPS) was isolated from Gougunao green tea by hot water extraction and ethanol precipitation. After purification by a diethylaminoethyl (DEAE) Sepharose Fast Flow column and a Sephacryl S-400 column, several homogalacturonan (HG) and rhamnogalacturonan-I (RG-I) fractions were obtained. Fraction GPS2b with the highest yield was selected for structural characterization by methylation and nuclear magnetic resonance (NMR) analysis. GPS2b was found to be an HG-type pectic polysaccharide (degree of methyl esterification [DE], 51.6%) with low molecular weight (Mw, 36.8 kDa). It was mainly composed of →4)-α-GalpA- (1→ and →4)-α-GalpA-6-OMe-(1→. In addition, a minor highly branched RG-I domain was identified in this fraction. The investigation of structural features of tea polysaccharides can provide insights to understand their structure-bioactivity relationship.
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Materials Today Communications
·
2023
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IF 3.8
Ye Jia,Donghai Zhu,Qifan Yang,Xu Liu,Zahra Gholami,Mohammadtaghi Vakili,Shuangxi Zhou,Wei Wang
The presence of mercury (Hg(II)), a highly toxic pollutant in the aquatic environment, motivates researchers to use an effective method to remove it from water. Herein, we synthesized COF-TAZ and COF-TOE via post-modification with 3-mercapto-1,2,4-triazole and 4-(methylsulfanyl)thiophenol to form triazole group and methylthio group, respectively, and followed by characterization with SEM, FTIR, and XRD, etc. The adsorption behaviors of Hg(II) on two modified COFs were evaluated by adsorption kinetic models using the pseudo-first order, pseudo-second order and intra-particle diffusion models, as well as isotherm models, i.e., Langmuir and Freundlich models. COF-TAZ and COF-TOE manifested maximum experimental uptake capacity of 108.09 mg g −1 and 104.85 mg g −1 , respectively. Notably, COF-TAZ exhibited commendable binding selectivity towards Hg(II) and displayed a good recycling ability, with a removal percentage still above 90% after five cycles. Especially, the adsorption mechanisms of COF-TAZ and COF-TOE were clarified by FTIR, XPS and DFT calculations, suggesting that electrostatic interaction and chelation were involved in the adsorption process . This study shows that functionalized COFs have good application prospects in effective removal of heavy metals in water.
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