Journal of the Iranian Chemical Society
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2022
·Vol. 19
·期 7
·2883-2890
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IF 2.271
Fu Qiuping,Lou Jie,Shi Denghong,Zhou Shaoqi,Hu Jing,Wang Qi,Huang Weijiang,Wang Kui,Yan Wei
Multi-walled carbon nanotubes (MWCNTs) were treated by reflux oxidation in a mixture (HNO 3 and H 2 SO 4 ), hydroxyl (–OH) and carboxyl (–COOH) functional groups were introduced on the surface of MWCNTs to obtain the Oxidized-MWCNTs (OMWCNTs). OMWCNTs were used as adsorbent to removal of Pb(II) from wastewater. The effects of contact time, initial concentration of Pb(II), OMWCNTs dosage, pH and coexisting ions (K + , Na + , Ca 2+ , Mg 2+ ) on the adsorption and removal of Pb(II) by OMWCNTs were systematically studied. The adsorption of Pb(II) by OMWCNTs could reach equilibrium in 10 min. The pH > 5 is conductive to the adsorption of Pb(II) by OMWCNTs. The coexisting ions (K + , Na + , Ca 2+ , Mg 2+ ) had almost no effect on the adsorption of Pb(II) by OMWCNTs. The results showed that the isothermal data fit the Freundlich and Langmuir isotherm models. The maximum adsorption capacity was 558.66 mg/g for Pb(II) from Langmuir isotherm. The pseudo-second-order kinetic model could well describe the adsorption process of Pb(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
SUPRAMOLECULAR CHEMISTRY
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2011
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IF 1.94
Jing Cao,Hai
Yan Deng,Chen
Hui Wang,Yao Xiao,Ming Ren,You
Wei Zhang
A 3,4-dimethylthieno[2,3-b]thiophene-based fluorogenic probe bearing benzo[d]-thiazole-2-thio unit (sodium 3,4-bis ((benzo[d]thiazol-2-ylthio)methyl) thieno [2, 3-b]thio-phene-2, 5-dicarboxylate) was developed as a novel fluorescent chemosensor with high selectivity towards Pb(II) over other cations tested. The new probe exhibited good water solubility and only sensed Pb(II) among metal ions examined in neutral 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid buffer solution. The selectivity and sensitivity of fluorogenic probe to Pb(II) were discussed on the basis of experimental results.
研究领域:
分析化学
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环境科学
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传感器与探针
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无机化学
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2015
·Vol. 132
·期 32
·
IF 1.768
Zhengyan Tan,Hong Peng,Hongfang Liu,Linling Wang,Jing Chen,Xiaohua Lu
A novel magnetic adsorbent (EDTA /chitosan/ PMMS) was facilely prepared by reacting chitosan with EDTA anhydride in presence of PEI - coated magnetic microspheres. The as-synthesized EDTA/ chitosan /PMMS was characterized by XRD, SEM, TGA, FT-IR , and VSM, and then employed in removal of heavy metals of Pb(II) from aqueous solution. The results of the batch adsorption experiments revealed that the adsorbents had extremely high uptake capacities for Pb(II) in the pH range of 2 to 5.5, and the adsorption kinetics for EDTA/ chitosan /PMMS was consistent with the pseudo – second - order kinetic model. Moreover, its equilibrium data were fitted with the Langmuir isothermal model well, which indicated that the adsorption mechanism was a homogeneous monolayer chemisorptions process. The maximum adsorption capacity of EDTA/ chitosan /PMMS for Pb(II) was found to be 210 mg g − 1 at pH 4 (30 ° C), and further reuse experiments results suggested that EDTA /chitosan/ PMMS could be a potential recyclable magnetic adsorbent in the practical wastewater treatment. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42384.
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
Nanoscale
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2016
·Vol. 8
·期 13
·7172-7179
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IF 7.76
Dezhi Chen,Weisong Shen,Shaolin Wu,Caiqin Chen,Xubiao Luo,Lin Guo
Nanoporous adsorbents of ZnO/ZnFe2O4/C were synthesized by using a metal organic framework (FeIII-modified MOF-5) as both the precursor and the self-sacrificing template. The adsorption properties of ZnO/ZnFe2O4/C toward Pb(II) ions were investigated, including the pH effect, adsorption equilibrium and adsorption kinetics. The adsorption isotherms and kinetics were well described by using the Langmuir isotherm model and pseudo-second-order model, respectively. The MOF-derived inorganic adsorbents exhibited high absorption performance with a maximum adsorption capacity of 344.83 mg g−1. X-ray powder diffraction and high-resolution X-ray photoelectron spectroscopy suggest that Zn(II) was substituted by a significant portion of Pb(II) on the surface of ZnO nanocrystals. Microscopic observations also demonstrate the effect of Pb(II) ions on ZnO crystals as reflected by the considerably reduced average particle size and defective outer layer. Quantitative measurement of the released Zn(II) ions and the adsorbed Pb(II) ions indicated a nearly linear relationship (R2 = 0.977). Moreover, Pb-containing ZnO/ZnFe2O4/C adsorbents are strongly magnetic allowing their separation from the water environment by an external magnet.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Chenliu Tang,Lan Ling,Wei-xian Zhang
Enhanced stability and prolonged reactivity of nanoparticles are critical factors for successful applications of the nanoscale zero-valent iron (nZVI) technology. In this work, g-C 3 N 4 was employed as a support for distributing, stabilizing nZVI and further changing the composition, microstructure and electronic structure of nZVI due to the interactions between the iron nanoparticles and g-C 3 N 4 sheet. Adjusting the micro-structure of nZVI to enhance the adsorption ability, control the electron transfer, shift IEP negatively, and improve the reactivities and stabilities coordinatively results in stabilized and long-term effective g-nZVI. For example, the accumulated wastewater (i.e., [Pb(II)] = 10 mg/L) treatment volume with g-nZVI in 5 runs is determined to be 50 L, more than twice the treatment capacity of bare nZVI. Besides, more Pb(II) is reduced to metallic Pb by g-nZVI than that by nZVI. Characterizations with spherical-aberration-corrected scanning transmission electron microscopy (Cs-STEM) integrated with X-ray energy dispersive spectroscopy (XEDS), electron energy loss spectroscopy (EELS), Raman spectroscopy, etc. visualize and quantitatively analyze the structural differences and distinctive reactive behaviors of nZVI and g-nZVI. The N-containing functional groups efficiently capture aqueous metal cations, accelerate mass transfer and electron transport from the iron core to surface-attached metal ions. In addition, the nZVI micro-structure change and the formation of covalent bonds between the lone-pair electron of nitrogen and empty orbital of iron apparently reduced the iron corrosion. Results provide direct evidence on the interface chemistry of g-nZVI and further verify the graphitic carbon nitride induces the Pb(II) ions to be deposited, reduced and grown onto iron nanoparticles.
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
MICROCHEMICAL JOURNAL
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2023
·
IF 4.8
Yuan Zhang,Lelin Qian,Zhangli Yu,Ying Yu,Chang Feng,Lili Niu,Juan Zhang
A simple, inexpensive, fast, and visual distance-based paper analytical device has been developed for on-site detection of Pb(II). Pb(II) can inhibit the catalytic activity of G-quadruplex/hemin (G4/hemin) DNAzyme induced by K + , which catalyzes 3,3,5,5-tetramethyl benzidine (TMB) immobilized on paper to produce a visible blue band. The factors affecting Pb(II) detection have been optimized with PS concentration of 3 μM, K + concentration of 10 mM, and hemin concentration of 10 μM, as well as the straight channel width of 2.0 mm. It can be well found that the formed length correlates with the concentration of Pb(II) with a linear detection range of 0.02 μM − 50 μM. A fitting linear equation of Y = 20.793–5.391Log C (R 2 = 0.9788) can be obtained with a lowest detection limit of 1 nM. Additionally, the method is capable of selectively detecting Pb(II) and works well for Pb(II) detection in real samples. Overall, the visual distance-based paper analytical device offers an ideal platform for on-site detection of heavy metal ions, especially in resource-limited areas.
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高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2024
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IF 4.8
Van-Hien Pham,Bich-Ngoc Duong,Duy-Khoi Nguyen,Loc Ton-That,N.T. Dang,D. Thanh Khan,Ngoc-Quyen Tran,Ngoc Duy Nguyen,Van-Phuc Dinh
The synthesis of zeolite ETS-10 is strongly influenced by factors such as pH, the amount of the structure-directing agent, hydrothermal temperature and duration, which collectively affect the material’s morphology and structure. This study thoroughly investigates the effects of these parameters on the synthesis of ETS-10 zeolite using TiCl 3 and a waterglass solution. Characterization of the materials was performed through X-ray diffraction (XRD), scanning electron microscopy (SEM), infrared spectroscopy (FT-IR), and nitrogen isotherm adsorption-desorption at 77 K (BET-BJH) techniques. The findings indicate that pH and the structure-directing agent significantly influenced the phase composition , while hydrothermal temperature predominantly determined the crystallization rate of ETS-10. Optimal synthesis conditions were established at an initial pH of 11, employing 0.3 g of the structure-directing agent and conducting hydrothermal crystallization at 230 °C for 24 h. Under these conditions, the ETS-10 zeolite produced exhibited a high surface area of 300.1 m 2 /g, making it effective in removing Pb 2+ ions from solution. In particular, when tested under optimal conditions (pH 5) for 600 min, Pb (II) adsorption by ETS-10 reached a maximum uptake capacity of 956.19 mg/g, as determined by the Langmuir isotherm model. This capacity surpasses that of as-synthesized ETS-10 prepared from alternative Ti sources and other materials used in previous studies on Pb(II) adsorption.
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
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yi Fang,Lang Yang,Feng Rao,Yongming Zheng,Zhenguo Song
In this study, a low-cost porous geopolymers (PGP) were prepared using coal gangue and fly ash as raw materials to remove organic and heavy metal ions from wastewater. Various characterization techniques were employed to investigate the microstructure, morphology, pore size distribution, and surface functional groups of the porous geopolymers. The results indicate that the geopolymer exhibits a porous structure with hydroxyl groups on the surface after foaming. It was found that the porous geopolymers exhibited good adsorption capacity for Methylene Blue (MB), Cu(II), and Pb(II), with optimal adsorption capacities reaching 35.60 mg/g, 98.31 mg/g, and 85.67 mg/g, respectively. Fitting analysis suggests that the adsorption of MB, Cu(II), and Pb(II) is better described by the pseudo-second-order kinetic model and the Freundlich isotherm model. This indicates that the adsorption process is primarily chemical adsorption with multilayer adsorption. Competitive adsorption studies showed that Cu(II) could enhance the adsorption of MB, while Pb(II) had no significant effect on the adsorption of MB. Mechanistic studies revealed that the adsorption of MB by PGP is mainly through pore adsorption, electrostatic attraction, and hydrogen bond formation; whereas the adsorption of Cu(II) and Pb(II) is primarily through pore adsorption, electrostatic attraction, chemical reactions, and ion exchange. Recycling experiments demonstrated that after five repetitions, the adsorption capacity of PGP for the three pollutants remained above 60 %. These findings confirm the potential of porous geopolymers as adsorbents. Preliminary cost analysis shows that the adsorption cost of porous geopolymers is only 2.07 RMB/kg, making the geopolymer adsorbent economically advantageous and promising for application, especially considering its ability to utilize industrial solid waste.
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
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Meng Cheng,Yuqi Liu,Hao Jiang,Chunling Li,Shuangqing Sun,Songqing Hu
Adsorbents with fast kinetics and high capacity have always been attractive for wastewater treatment. Herein, multi-shelled hollow mesoporous organosilica functionalized by hydroxyphosphatoethyl groups on dual-pore surfaces (P-HMO) is prepared by general one-pot co-condensation. The resulting P-HMO exhibits high hydrophilicity, large surface area and well-developed pore structure, providing P-HMO fast adsorption kinetics (C 0 = 320 mg·L -1 , equilibrium within 5 min) and ultrahigh adsorption efficiency for Pb(II) and Cr(VI), the adsorption capacity reaches 1056.53 and 869.56 mg·g −1 , respectively. Furthermore, P-HMO displays outstanding reusability over 10 adsorption–desorption cycles thanks to the stable framework structure that can resist wear and tear during water treatment. The advantages of long service life, high efficiency and broad pH range make P-HMO promising in industrial water purification.
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
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Mengshuo Du,Yingying Wang,Youyu Cao,Wenzhi Tang,Zhonghong Li
Metal–organic frameworks (MOFs) are attractive adsorbents for heavy metal capture due to their superior stability, easy modification, and adjustable pore size. However, their inherent microporous structure poses challenges in achieving a higher adsorption capacity. Defect engineering is considered a simple method to create hierarchical MOFs with larger pores. Here, we employed l-aspartic acid as a mixed linker to bind Zr4+ clusters in competition with fumaric acid of MOF-801 to create defects, and the pore size was increased from 4.66 to 15.65 nm. Mercaptosuccinic acid was subsequently used as a postexchange ligand to graft the resultant MOF-801 by acid-ammonia condensation to further expand the pore size to 22.73 nm. Notably, the −NH2, −COOH, and −SH groups contributed by these two ligands increased the adsorption sites for Pb(II). The obtained defective MOF-801 with larger pores was thereafter loaded onto sodium alginate to form aerogel beads as adsorbents, and an adsorption capacity of 375.48 mg/g for Pb(II) was achieved, which is ∼51 times that of pristine MOF-801. The aerogel beads also exhibited outstanding reusability with a removal efficiency of ∼90.23% after 5 cycles of use. The adsorption mechanism of Pb(II) included ion-exchange interaction, as well as chelation interactions of Pb–O, Pb–NH2, and Pb–S. The versatile combination of defect engineering and composite beads provides novel inspirations for MOF modification for boosting heavy metal adsorption.
研究领域:
材料科学
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环境科学
·
化学工程
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DOI
PubMed
高影响因子
Journal of Hazardous Materials Advances
·
2025
·
IF 7.7
Zhirong Chen,Jinfeng Tang,Nana Wang,Jianqiao Wang,Tangfu Xiao,Minqi Fan,Yu Chen,Runshen He,Mengyang You
Lead (Pb) bioaccumulation in aquatic ecosystems poses significant threats to environmental health and human safety. To address the urgent need for efficient and operationally simple adsorbents for aqueous Pb(II) removal, this study presents the development of novel biomass adsorbents, specifically xanthate-modified Auricularia auricula (XAAS), Pleurotus ostreatus (XPOS) and Flammulina velutipes (XFVS), for the rapid and selective removal of Pb(II) ions from aqueous solutions. These materials were synthesized via a straightforward xanthate modification followed by lyophilization, optimizing conditions to balance cost-effectiveness and adsorption performance. Structural characterization revealed a three-dimensional macroporous architecture in all adsorbents, enabling rapid solid-liquid separation through simple filtration. Kinetic studies revealed that Pb(II) removal by XAAS, XPOS and XFVS was predominantly chemisorption-driven, reaching equilibrium within 15 min. Langmuir isotherm modeling determined maximum adsorption capacities of 190.48, 161.03 and 170.94 mg/g, respectively, showing minimal temperature dependence. Competitive adsorption experiments established Pb(II) selectivity following the inhibition sequence: Cr(III) > Cu(II) > Cd(II) > Tl(I). Mechanistic studies identified ion exchange, surface complexation and microprecipitation as primary removal pathways. Notably, xanthate hydrolysis within the adsorbent matrices facilitated the formation of PbS and Pb 3 (CO 3 ) 2 (OH) 2 nanoparticles. In simulated Pb(II)-contaminated Pearl River water, the adsorbents achieved >86% removal at 34.11 mg/L Pb(II) and complete elimination (100%) at trace levels (0.41 mg/L). These fungal-derived adsorbents exhibited comparable structural properties and Pb(II) removal performance. Their combination of high adsorption capacity, rapid kinetics, selectivity and simple synthesis underscores strong potential for practical remediation of heavy-metal-polluted surface waters.
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高影响因子
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
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2025
·
IF 3
Shuying Shi,Zitao Guo,Zetao Liu,Ailin Yang,Yongshuang You,Long jiang,Hao deng,Pengfei Gao
Magnetic fibers are ideal adsorbent material, the fibers have large aspect ratio, entangled with each other, do not agglomerate in water, magnetic materials can be magnetically separated, so magnetic fibers have the advantage of not agglomerating in water, easy to separate, more suitable for use as an adsorbent. The most commonly used methods for preparing NiFe 2 O 4 fibers were direct electrospinning and surface loading. Whether using NiFe 2 O 4 as a filler for direct electrospinning or loading it onto fibers, there are issues with limited NiFe 2 O 4 content and uneven loading. Compared to commonly used direct electrospinning and surface loading, we developed a simple sol–gel method to prepare the precursor spinning solution, then prepared the magnetic NiFe 2 O 4 fibers with excellent flexibility through electrospinning, and applied it to the adsorption of Pb (II) for the first time. The spinning solution was synthesized using iron sources, nickel sources and citric acid, the iron and nickel ions coordinated with carboxyl group according to the monodentate coordination. The flexible NiFe 2 O 4 fibers exhibited a saturation magnetization of 18.2 emu/g. Specific surface area of the flexible NiFe 2 O 4 fibers was 13.443 m 2 /g and total pore volume of the magnetic NiFe 2 O 4 fibers was 0.074 cm 3 /g. In the adsorption experiment, The NiFe 2 O 4 fibers demonstrated a maximum Pb(II) adsorption capacity of 49.53 mg/g. Due to the self-supporting and non-agglomeration advantages of the fiber structure in solution and the maximum adsorption capacity of the NiFe 2 O 4 fibers synthesized in this study for Pb(II) exceeded that of most previously reported NiFe 2 O 4 adsorbents. Flexible magnetic fibers provided a new solution for simultaneously improving the adsorption capacity of pollutant and achieving rapid magnetic separation, becoming another new material for expanding applications in the field of wastewater treatment.
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