Progress in Natural Science-Materials International
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2023
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IF 4.7
Xuechun Wang,Zeming Dai,Xuan Zhou,Hao Chen,Yu Cao,Jianhua Hou,Xiaozhi Wang
In general, majority of MOFs are powder, which limit their applications. In this study, the highly stable Zr-based MOF-808 and its thiol-modified MOF-808-SH were selected as precursors, and then they were wrapped by sodium alginate hydrogel via a dripping strategy. Based on these, MOF/hydrogel composite beads (Alg-MOF-808, Alg-MOF-808-SH) with 3D network structure were prepared successfully. Due to its excellent adsorption properties and easy recovery, they were employed as effective environmental functional materials for the adsorption of Hg (II). The adsorption capacities of Hg (II) were 170.52 mg‧g −1 and 221.73 mg‧g −1 respectively and they can achieve adsorption equilibrium in a short time. The adsorption stability of Alg-MOF-808-SH was studied at different pH as well. In addition, the removal efficiency of composite beads for Hg (II) was almost unaffected by other coexisting ions, displaying good adsorption selectivity. Furthermore, the removal efficiency only decreased by 10.4% after 5 cycles, indicating that the as-prepared materials have high recycling efficiency. The results demonstrated that the MOF/hydrogel composite beads have a certain application potential for mercury removal in actual wastewater.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
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.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2023
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IF 9.8
Mingling Xiao,Xiaofang Lai,Jun He,Jiahao Huang,Zhenhua Tang,Ruiwen Wu,Jikang Jian
FeS (mackinawite) is known to be effective in the sorption of aqueous Hg(II). However, FeS nanoparticles are apt to aggregate and easy to be oxidized, which limits their wide applications. Here, we have synthesized FeS micro-flakes which can be uniformly dispersed in water without aggregation. Owing to the good stability and dispersibility, FeS micro-flakes exhibit high efficiency in the removal of Hg(II) from water. The sorption of Hg(II) on the FeS micro-flakes is more consistent with the pseudo-second-order kinetic model and Langmuir model, indicating that the sorption of Hg(II) is mainly monolayer sorption dominated by chemical sorption. The maximum sorption capacity is 2680 mg/g at pH 5.6 and 30 °C, significantly higher than those of FeS nanoparticles and other Hg(II) scavengers. The pH studies indicate that FeS (0.31 g/L) can effectively remove >97.6 % of 200 mg/L Hg(II) in the pH range of 2–12 at 30 °C. Powder X-ray diffraction, elemental and sorption analyses suggest that Hg(II) is removed via chemical precipitation and surface adsorption. This study demonstrates the potential and viability of FeS micro-flakes for efficient removal of aqueous Hg(II).
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
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2019
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IF 6.97
Lijin Huang,Qin Shuai
Construction of adsorbents with specific porous structure and heteroatom doping is significant for enhancing adsorption performance toward the contaminants. However, it is still a crucial task for selective adsorption with high affinity and fast uptake kinetics. Herein, we present a facile and cost-effective postsynthesis modification approach to fabricate a novel effective sulfur-doped magnetic amide-linked organic polymer (S-MAOP), where AOP is chemically anchored on the surface of NH2-functionalized magnetic nanoparticles. The thionation process, e.g., transforming the amide group (−C═O–NH−) into the thioamide group (−C═S–NH−), was illustrated by treating the MAOP with Lawesson’s reagent. The resultant S-MAOP exhibited much higher adsorption selectivity and affinity for Hg(II) uptake from water solution than the initial MAOP due to introduction of thioamide groups in the network. In addition, by covalently anchoring polymer networks onto magnetic nanoparticles, recovery and regeneration of S-MAOP were greatly facilitated due to its good superparamagnetism. Furthermore, it also showed superior stability, of which the adsorption capacity was well maintained even after 5 cycles. The remarkable adsorption performance, good cycling stability, and cost-efficient synthesis make S-MAOP a desirable adsorbent for contaminant removal.
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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2025
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IF 8.5
Donglei Wei,Xiaoxia Liu,Zichen Wu,Hou Chen,Liangjiu Bai,Huawei Yang,Lixia Yang,Wenxiang Wang,Xiaofeng Zhang,Junling Wang
Cellulose-based polymer brush-on-brush composite adsorbent is prepared under simple and mild conditions via a four-step two sequential organophotocatalyzed atom transfer radical polymerization for the efficient removal of Hg(II) from aqueous media. The defined structure of the cellulose-based composites was supported by the characterization results. Influences of solution pH, temperature and adsorbent dosage on the adsorption behavior of the adsorbent were determined by batch experiments. The adsorption performance of the polymer brush composite intermediate was also investigated as a comparison to the final adsorbent to illustrate the significance of the topological surface structure on adsorption efficiency and capacity. Adsorption kinetics, isotherm and mechanism were studied systematically to further clarify the adsorption process. In addition, the adsorbent exhibits good applicability as it can be reused for 5 times without obvious decrease in desorption rate (>90 %), which showed potential utility for preconcentration and recovery of aqueous Hg(II).
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
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IF 7.7
Boyun Wang,Wanqi Zhang,Yuan Zhong,Yuan Guo,Ximing Wang,Xiaotao Zhang
Ions of mercury, one of the most hazardous heavy metals in nature, pose serious risks to the environment and human health. Blue sulfur-doped carbon dots (SCDs) from corn stalks were utilized as material. The SCDs were incorporated into a carboxylated hydrogel modified with sulfur, and a compound gel (SCDs–KTOCS gel) was successfully fabricated for simultaneous fluorescence detection and Hg(II) adsorption. This enabled the effective identification and removal of Hg(II) from contaminated water. The chemical content, fluorescence properties, and adsorption behaviors of the SCDs–KTOCS–gels were analyzed. The results demonstrate that the SCDs–KTOCS–gels exhibited effective Hg(II) adsorption (193 mg/g) and an extensive linear spectrum for Hg(II) fluorescence emission (150–500 mg/L; detection limit = 1.5668 mg/L). The adsorption values fit well with the Temkin models and pseudo-second-order kinetics. Additionally, Hg(II) detection and adsorption in the SCDs–KTOCS–gels were examined. By exchanging the existing probe for a suitable one that fits various relevant applications, this study suggests an environmentally friendly and sustainable method of producing materials for removing and detecting Hg(II) and constructing a fluorescence hydrogel for the detection and adsorption of different metals.
研究领域:
环境科学
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材料科学
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化学
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可持续技术
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DOI
PubMed
高影响因子
Journal of Water Process Engineering
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2022
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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.
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
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IF 8.2
Ming Li,Panpan Zhang,Xuemeng Zhang,Qian Chen,Qianyong Cao,Yuling Zhang,Huining Xiao
Mercury pollution in aqueous solutions is a severe problem in environmental protection and the contaminated water may cause serious risks to human health. Based on the constant development of adsorptive materials, adsorption technique is widely applied as an efficient and convenient approach to eliminate mercury species from waters. In this work, we report a one-pot procedure to prepare a bis-Schiff base cellulosic adsorbent to integrate the advantages of large adsorptive capacity and excellent fluorescent recognition towards mercury ions. The adsorption experiments demonstrate that sulfydryl-contained cellulosic nanocrystals exhibit specific affinity with mercury species and the adsorption capacity reaches as high as 624.8 mg/g at room temperature. Besides, the introduction of rhodamine moiety endows the material a 19 times enhancement of selective “off-on” fluorescent sensing while exposed to mercury. Additionally, the bifunctional adsorbent material shows high sensitivity towards mercury ions in aqueous solution with detection limits of as low as 8.29 × 10 −8 M for fluorescence and 5.9 × 10 −9 M for UV–vis spectrum, respectively. The fitting results of the adsorption models indicate a monolayer adsorption during the uptake of mercury ions and the removal process follows the pseudo-second order kinetics. Moreover, density functional theory studies are employed to further understand the adsorptive and responsive mechanisms.
研究领域:
环境科学
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材料科学
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分析化学
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）