SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Zhiqiang Guo,Lei Sun,Hui Hou,Jian Zhou,Yuan Li,Liangliang Hu,Jinzhang Xu
The preparation of the maple leaf-like MnO 2 –SiO 2 @PDA biomimetic composites not only overcame the problem of easy agglomeration of nanoparticles, but also provided rich functional groups, large specific surface areas and good stability, achieving the efficient sorption of Cu(II), Cd(II) and Ni(II) from aqueous solution. The maximum sorption capacities of the MnO 2 –SiO 2 @PDA towards Cu(II), Cd(II) and Ni(II) attained from the Langmuir model were 218.788, 383.420 and 148.939 mg·g −1 , respectively. The sorption of Cu(II), Cd(II) and Ni(II) on the MnO 2 –SiO 2 @PDA were strongly affected by pH, but not by ionic strength, showing good resistance to salt interference. The main sorption mechanism of the MnO 2 –SiO 2 @PDA towards Cu(II), Cd(II) and Ni(II) was the strong surface complexation of the functional groups on the MnO 2 –SiO 2 @PDA with Cu(II), Cd(II) and Ni(II). Moreover, the radii of Cu(II), Cd(II) and Ni(II) ions and their complexation strength with the MnO 2 –SiO 2 @PDA jointly determined the order of the competitive sorption capacities as Cu(II) > Cd(II) > Ni(II). Given the above analyses, the maple leaf-like MnO 2 –SiO 2 @PDA biomimetic composites have excellent application prospects in practical wastewater treatment.
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
Open Chemistry
·
2020
·Vol. 18
·期 1
·97-107
·
IF 1.216
Huayu Huang,Yang Wang,Yubin Zhang,Zhiying Niu,Xinli Li
Amino-functionalized graphene oxide (GO-NH 2 ) was synthesized by grafting (3-aminopropyl) triethoxysilane on the graphene oxide (GO) surface. The GO-NH 2 with high surface area and numerous active sites can efficiently adsorb Cr(VI), Cu(II), Pb(II) and Cd(II) ions. The maximum adsorption capacities of GO-NH 2 for Cr(VI), Cu(II), Pb(II) and Cd(II) were 280.11, 26.25, 71.89 and 10.04 mg g −1 , respectively. The pseudo-first-order and pseudo-second-order kinetic models were employed to describe the kinetic processes. The experimental data agreed well with the pseudo-second-order kinetic equation, and the adsorption of heavy metals onto GO-NH 2 occurs via chemical adsorption. The characteristics of Cr(VI), Cu(II), Pb(II) and Cd(II) in the GO-NH 2 adsorption processes were analyzed using the Langmuir and Freundlich isotherm models. The adsorption processes of Pb(II) and Cd(II) on GO-NH 2 were fit by the Langmuir model. The Freundlich isotherm model was well correlated to Cr(VI) and Cu(II). The GO-NH 2 is a promising material for the removal of heavy metal ions from industrial wastewater. This study provides an effective pathway to process industrial wastewater, and the GO-NH 2 has a good adsorption effect for the treatment of heavy metals in industrial wastewater.
研究领域:
环境科学
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化学工程
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材料科学
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水处理
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DOI
高影响因子
Journal of Macromolecular Science Part A-Pure and Applied Chemistry
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2019
·
IF 1.163
Peng Zhou,Hua Yuan,Lijun Ou,Peng Zhiyuan
Tannin was crosslinked with paraformaldehyde to prepare tannin-phenolic polymer(TP), TP immobilized on cellulose (TPPC) was prepared by the cross-linking reaction of TP and cellulose with epichlorohydrin as crosslinking agent. Tannin was crosslinked prior to being immobilized on cellulose, which could increase the effective phenolic hydroxyl content in cellulose skeleton and improve the adsorption property of TPPC for metal ions. The maximum adsorption capacity of TPPC for Cd(II) and Cu(II) ions were 80.11 mg/g and 55.97 mg/g, respectively. The adsorption equilibrium data for the metal solutions fitted the Langmuir model well. The adsorption rate data fitted well to a Pseudo-second-order model. The TPPC has potential application value in the field of metal wastewater treatment.
研究领域:
环境科学
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高分子科学
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水处理技术
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吸附技术
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化学工程
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2024
·
IF 1.3
Lin Yang,Yijing Ai,Shihui Xu,Lisi Wang,Xiaoping Zhang,Wei Sun
In this paper, Bismuth/poly(3,4-ethylenedioxythiophene) (Bi/PEDOT) modified electrochemical modified electrodes were prepared by electrochemical deposition method, and the electrochemical performance of the electrode was investigated using cyclic voltammetry under the optimal experimental conditions. The PEDOT polymer has high conductivity, and bismuth can form an alloy with cadmium ions. Bi/PEDOT nanocomposite materials have a larger specific surface area and more active sites, which is more conducive to absorbing more cadmium ions (Cd 2+ ). The Differential pulse anodic stripping voltammetry method was used to study the electroanalytical performance of the sensor for Cd 2+ . The data show that the oxidation peak current of cadmium ions in the Bi/PEDOT modified electrode is significantly higher than that of other electrodes, due to the synergistic effect of the composite conductive materials. In the concentration range of 1 nM-40 μM, the concentration of cadmium ions shows a good linear relationship with the peak current, and the lowest detection limit is 0.33 nM. In addition, the sensor also exhibits good stability, reproducibility and very low detection limit, which can be used for rapid determination of trace cadmium ions, with a recovery rate in actual sample analysis of 101.4 %-104.0 %.
研究领域:
电化学
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材料科学
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分析化学
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环境科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2023
·
IF 3.9
Lan Zhang,Keli Zhang,Shengle Kang,Shanshan He,Xiang Dong,Yan Zhao,Fangfang Li,Qihong Cen
Crystalline celluloses , such as microcrystalline cellulose (MCC) and nanocrystalline cellulose (NCC), which are originated from biomass, were utilized as templates to prepare hierarchical LTA zeolites . The effect of both size and surface properties of crystalline cellulose on the zeolite synthesis were carefully discussed. As-prepared zeolite based on surface-modification NCC showed hierarchical porous structure with monolithic morphology inherited from nanocrystalline cellulose. Its specific surface area was measured to be 18.3 m 2 /g, which was approximately 3.4 times that of the traditional zeolite A (Z0, 5.4 m 2 /g). Owing to its unique structure, ZNSC facilitated fast Cd(II) adsorption with the adsorption equilibrium time shortened by 81.3%. Kinetics study revealed that intraparticle diffusion was significantly enhanced and the effective diffusion coefficient increased by near 5 times. Furthermore, the maximum adsorption capacity achieved by ZNSC was 324.3 mg/g at 283 K, as calculated from the Langmuir model, which was 1.3 times that of Z0. These results are obtained when the grain size of ZNSC is larger than that of Z0, reflecting the superiority of the hierarchical structure in enhancing adsorption performance and thus providing a facile yet robust strategy for designing hierarchically structured zeolites for rapid and efficient wastewater treatment .
研究领域:
材料科学
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环境工程
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化学工程
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产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Yanyan Niu,Yuxue Chen,Xiaoping Zhang,Hui Xie,Guiling Luo,Wei Sun
In this paper a photoelectrochemical (PEC) aptasensor based on specific recognition between aptamer and target cadmium ion (Cd(II)) with change of the sensing interface structure was constructed. A ZnO-TiO 2 nanocomposites and Au nanochains (Au NCs) modified electrode as photosensitive substrate was prepared and further covalently bound with graphite-like carbon nitride (g-C 3 N 4 ) on the free end of the aptamers to amplify the detection signal, which was applied to Cd(II) detection. Graphite-like carbon nitride with narrow band gap exhibited unique photoelectric property under UV and visible light irradiation. When the target Cd(II) was detected by the modified interface of the aptasensor, the structure of sensing interface was changed with the signal sensitizer g-C 3 N 4 closed to the interface, which caused the changes of photocurrent signal more sensitive and exhibited a good linear relationship with the Cd(II) concentration, so as to realize the quantitative analysis of the target. This PEC aptasensor showed a high sensitivity with a detection limit as 1.1 × 10 −11 mol/L and was further applied to the water sample detection successfully.
研究领域:
分析化学
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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
RSC Advances
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2021
·Vol. 11
·期 55
·34487-34497
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IF 3.361
Hui Cao,Pu Yang,Tai Ye,Min Yuan,Jinsong Yu,Xiuxiu Wu,Fengqin Yin,Yan Li,Fei Xu
Edible vegetable oils are easily contaminated by heavy metals, resulting in the oxidative degradation of oils and various health effects on humans. Therefore, it is very important to develop a rapid and efficient method to extract trace heavy metals from vegetable oils. In this work, a highly hydrophobic ion-imprinted polymer (IIP) was synthesized on a novel raspberry (RS)-like particle surface. The synthesized IIP@RS was characterized and used in solid-phase extraction (SPE) for the selective and fast adsorption of Cd(II) from vegetable oils. The results showed that IIP was successfully coated onto RS particles with a high specific surface area (458.7 m2 g−1) and uniform porous structure. The contact angle (θ) value (141.8°) of IIP@RS was close to the critical value of super-hydrophobic materials, which is beneficial to their adsorption in hydrophobic vegetable oils. The IIP@RS also exhibited excellent adsorption ability and selectivity to Cd(II) with a maximum adsorption capacity of 36.62 mg g−1, imprinting factor of 4.31 and equilibrium adsorption rate of 30 min. According to isothermal titration calorimetry results, the recognition behavior of IIP@RS for Cd(II) was mainly contributed by Cd(II)-induced cavities during gel formation and coordination between Cd(II) and –SH groups in imprinted cavities. Furthermore, the adsorption process driven by entropy and enthalpy was spontaneous at all temperatures. In real vegetable oil samples, IIP@RS-SPE adsorbed approximately 96.5–115.8% of Cd(II) with a detection limit of 0.62 μg L−1. Therefore, IIP@RS has wide application prospects in enriching and detecting Cd(II) from vegetable oil.
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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食品科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2023
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IF 13.6
Bin Han,Jing Liu,Runliang Zhu,Qingze Chen
Clay minerals and iron (hydr)oxides are important geosorbents in controlling the migration of heavy metal cations in the environment. Despite the widespread occurrence of clay minerals/iron (hydr)oxides composites, their complex mutual effects on the fate of heavy metal cations are not well recognized. In this work, we investigated the effect of clay minerals on the redistribution of Cd(II) during the phase transformation of ferrihydrite containing coprecipitated Cd(II) (Cd-Fh). Three systems were considered: i.e., Cd-Fh, Cd-Fh/kaolinite composite, and Cd-Fh/montmorillonite composite. Our results showed that the transformation of Fh into goethite and hematite caused the release of Cd(II), while the presence of kaolinite and montmorillonite inhibited the phase transformation of Fh and the release of Cd(II), with montmorillonite being more effective in these process. Multiple factors contributed to the reduced release of Cd(II), including the retarded transformation of Fh, the buffering of solution pH, and the re-adsorption of the released Cd(II). Our findings show that clay minerals have multiple effects in reducing the release of heavy metal cations from Fh during its transformation process, which sheds new light on understanding the critical roles of nanominerals in modulating the migration and bioavailability of heavy metal cations in the environment.
研究领域:
环境科学
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地球化学
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土壤化学
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纳米矿物学
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重金属污染
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DOI
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
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2024
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IF 3.9
Xu Mengxia,Wu Rao,Wang Shengqian,Xu Hualan,Zhong Shengliang
The preparation of coordination polymers with good room temperature phosphorescence is the focus of current research. In this paper, zinc and cadmium were used as metal ions and 2,3-pyridinedicarboxylic acid (H 2 L = 2,3-pyridinedicarboxylic acid) was used as organic ligands to successfully synthesize Cd (II) homometallic [CdL]·H 2 O and Zn(II)Cd(II) heterometallic [ZnCdL 2 ]·DMF·5H 2 O coordination polymers microstructures. In addition, morphology, powder X-ray diffraction (PXRD), infrared spectroscopy (IR), elemental analyses, thermogravimetric analysis (TGA) and their luminescence properties were studied. Cd-CP is a micron-sized spherical structure, while Zn/Cd-CP is a flower-like structure formed by the accumulation of sheets. The results show that Cd(II) homo- and Zn(II)Cd(II) heterometallic coordination polymers have quantum yields of 10.05% and 8.54%, respectively. It is worth noting that the lifetime of Cd-CP is 124.62 ms, while the lifetime of Zn/Cd-CP is significantly extended to 363.09 ms after doping with metal ion Zn 2+ . The phosphorescent lifetime of coordination polymers was improved by the heterometallic doping strategy, which provided a new idea and method for the preparation of coordination polymers with long-lived room temperature phosphorescent properties. In addition, the two coordination polymers exhibited blue and cyan fluorescence at 365 nm UV light, respectively, and a green afterglow of about 2 s could be observed with the naked eye when the UV lamp was turned off.
研究领域:
材料科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
Chemistry-An Asian Journal
·
2023
·Vol. 18
·期 11
·e202300146
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IF 4.1
Wen-ting Zhao,Huan Zhang,Ke Feng,Tian-yang Wang,Lei Han,Hai-feng Xing,Fei Huang,Wen-bo Wang
Graphical A feasible “one stone, three birds” strategy was developed to achieve simultaneously the harmless disposal and reutilization of waste acid-leaching liquid, the synthesis of new materials and the efficient decontamination of dye or Cd(II) pollutants, by converting Al, Mg-rich waste acid leachate into silicate adsorbent. The adsorbent showed excellent adsorption performance and reusability towards cationic dye and Cd(II) in real waters. An emerging “one stone, three birds” strategy was proposed to realize the value-added disposal of solid waste coal gangue (CG), the synthesis of superb adsorbent and the efficient decontamination of pollutants (i. e., dyes, heavy metals). In this process, the metal ions extrated from calcined coal gangue (CCG) was reconstituted by a one-step hydrothermal process to yield porous polymetallic silicate adsorbent (named HECCGA8h). The adsorbent has a high adsorption capacity of 270.27 and 185.53 mg/g for methylene blue (MB) and Cd(II), respectively. In the actual waters, the removal rate of MB by this adsorbent reaches 99.8% (in Yangtze River water) and 99.42% (in Seawater), and the removal rate of Cd(II) reaches 99.11% (in Yangtze River water) and 92.52% (in Seawater), respectively. Thermokinetic analysis showed that the adsorption of MB by HECCGA8h is spontaneous and endothermic with increased entropy, and the adsorption of Cd(II) is spontaneous and exothermic. The adsorption of MB is mainly driven by synergism of hydrogen bond, electrostatic attraction and ion exchange, and the adsorption of Cd(II) is mainly driven by the complexation and ion exchange between the surface group of the adsorbent and Cd(II). This research provides a new way for the realization of “treating waste with waste”.
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
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 12
·11576-11583
·
IF 2.8
Tang Ting,Yang Chen,Wang Li,Jiang Xianying,Dang Zhi,Huang Weilin
This study quantified the complex stability constants of sulfamethazine (SMT) with cadmium (Cd 2+ ) and lead (Pb 2+ ) under different pH conditions. The UV-Vis spectrophotometer was used for acquiring the complexation data. Results showed that the complex stability constants of SMT with cadmium (Cd 2+ ) and lead (Pb 2+ ) increased as a function of the solution pH. In the investigated pH range, Cd 2+ showed stronger complex affinity with SMT than Pb 2+ . It appeared that cation - π interactions might dominate the complex between SMT with Pb 2+ and Cd 2+ at acid environment, and the covalent bonding might play a major role at neutral environment. Batch adsorption equilibrium experiment showed that the sorption capacity of Cd 2+ on goethite increased from 3.83 to 7.64 mg/g along with the addition of 1 mg/L SMT, indicating SMT can impede the transportation of Cd. In general, this study worked out the complexation constants and clarified the complexation mechanism between SMT with lead and cadmium, while sorption experiment indicated that sorption of Cd onto goethite was enhanced with SMT.
研究领域:
环境科学
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化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Juan Liu,Zhujian Huang,Jie Sun,Yixuan Zou,Beini Gong
In this study, thiourea reduced graphene oxide/NaA zeolite composite (tGO-Zeo) was successfully prepared by a facile two-step synthetic route and used as an efficient adsorbent for removal of Cd(II) from aqueous solution. Characterization of the composite material showed that tGO was entrapped within zeolite crystalline particles and intimately interacted with the zeolite framework. Furthermore, the presence of tGO considerably reduced zeolite crystal size and altered crystal morphology, turning cubic zeolite crystals of micrometer size into nanometer irregular particles. Batch adsorption experiment for Cd(II) removal was conducted and the adsorption performance of tGO-Zeo and Zeo (zeolite) were determined. It was shown that doped tGO significantly enhanced the adsorption capacity of zeolite by 31.54%. The adsorption mechanism differs for tGO-Zeo and Zeo, and tGO-Zeo has higher affinity for Cd(II). The adsorption capacity of tGO-Zeo with a tGO doping amount of 1.26% (wt%) was estimated to be 196 mg/g (1.74 mM/g) at 30 °C and superior to most previously reported zeolite based composites, which often contain large amounts of dopants . The effects of pH and ionic strength on adsorption suggest that ion exchange and coordination are responsible for Cd(II) adsorption by tGO-Zeo. Humic acid can slightly increase Cd(II) adsorption performance of tGO-Zeo, which may be due to tGO-Zeo—humic acid—Cd(II) complexes formation. Therefore, tGO-Zeo composite is a cost-effective and eco-friendly adsorbent for efficient removal of Cd(II) ions from aqueous solutions.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
危险品化学品经营许可证（带存储）