INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2020
·
IF 5.162
Hongling Zhang,Jianzhe Ma,Fengyun Wang,Yuting Chu,Lei Yang,Mingzhu Xia
The carboxymethyl-chitosan-montmorillonite (CMC-MMT) organic-inorganic hybrid material was applied to adsorb Pb(II) and Congo red (CR) anionic dye from aqueous solution. Molecular dynamics(MD) simulation was carried out to reveal the mechanism of CMC hybrid MMT. The results suggested that CMC has been adsorbed on the interlayer space and surface of MMT, hydrogen bonds had been formed between hydroxyl & carboxyl groups of CMC with the surface of MMT, Van der Waals interaction was also existed, while amino groups of CMC hadn't obvious interaction with the surface of MMT. Batch experiments were executed to investigate the adsorption effect of CMC-MMT was compared with Na-MMT and CMC. The results showed that CMC-MMT exhibited the higher adsorption capacity than Na-MMT and CMC, The OH and COOH or NH 2 groups of CMC chains may serve as electrostatic interaction active sites and coordination sites, which improved the adsorption performance of CMC-MMT on Pb(II)，and the insertion of CMC enlarged the inter-layer space of MMT, resulting in more surface active sites in the CMC-MMT hybrid composite, which increased the adsorption of organic pollutant CR. The kinetic and isotherm studies indicated that the pseudo-second-order and the Langmuir model well described the adsorption equilibrium of Pb(II) and CR on CMC-MMT.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2019
·
IF 2.298
Fang Cao,Juan Shen
Using polyethylenimine-modified carboxylmethyl konjac glucomannan as a matrix and graphene oxide as nanofillers, a novel porous biocomposite named as PCGt was synthesized by a facile chemical cross-linking method. The structure of prepared PCGt was characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, thermal gravimetric analysis, and X-ray photoelectron spectroscopy. Batch adsorption experiments was designed to exploit key factors on Pb(II) removal such as the pH, dose, contact time, initial concentration, and temperature. According to the data from pseudo-second-order kinetic and Freundlich isotherm models, the adsorption process was controlled by chemisorption and occurred on heterogeneous surfaces. The maximum adsorption capacity of PCGt on Pb(II) was up to 977 mg g–1 at 303.15 K. In thermodynamic analysis, positive enthalpy change and negative Gibbs free energy change exposed that the adsorption was endothermic and spontaneous at 308.15 K. The recyclability of PCGt was confirmed by leaching and desorption experiments. The adsorption mechanism was proposed that the chemical complexation between Pb(II) with the functional groups on PCGt. All outcomes effectively revealed that the biocomposite PCGt was a good candidate to remove Pb(II) from aqueous solution for the waste disposal industry.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2017
·
IF 2.538
Shuangzhen Guo,Pengpeng Jiao,Zhigang Dan,Ning Duan,Jian Zhang,Guanyi Chen,Wubin Gao
A novel l -arginine modified magnetic bioadsorbent (Fe 3 O 4 -CS-L) was fabricated to remove Zn(II), Cd(II) and Pb(II) from aqueous solution by adsorption method. Several techniques such as FT-IR, SEM, XRD, TGA and VSM were used for characterizing the Fe 3 O 4 -CS-L. The results showed that the Fe 3 O 4 -CS-L was successfully prepared. Batch experiments were conducted to investigate the parameters affecting the adsorption of the novel magnetic bioadsorbent to metal irons, such as adsorption isotherm and adsorption kinetics. The adsorption equilibrium was commendably described by pseudo-second-order model. Langmuir model was better than Freundlich model to describe adsorption isotherm data and the predicted maximum adsorption capacities of Zn(II), Cd(II) and Pb(II) were 256.41 mg/g, 156.99 mg/g and 128.63 mg/g, respectively. Competition adsorption results showed that the adsorption order of Fe 3 O 4 -CS-L to metal ions was Pb(II) > Zn(II) > Cd(II). Moreover, regeneration studies suggested that Fe 3 O 4 -CS-L has a good recyclability. All the results showed that Fe 3 O 4 -CS-L could be a promising material in environment pollution cleanup.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Xiaoqi Liu,Yanyun Zhang,Yan Liu,Ting'an Zhang
Chitosan bead grafted by third-generation dendrimers (CB-G3) with a diameter of 1.40 mm was synthesized to investigate their performance in recovering Ag(I), Cu(II), and Pb(II) ions in aqueous media. The prepared adsorbents were characterized by XRD, FT-IR, elemental analysis, TGA , and SEM, and the effects of pH, contact time, concentration, and temperature were examined. The results showed that the adsorbents were successfully fabricated. The optimum pH value was 5, and the increased generation number contributed to adsorption capacity improvement, indicating that electrostatic interactions between amine groups and metal ions are the governing mechanism of adsorption by the CB-G3. The kinetics, isotherms, and thermodynamics of Ag(I), Cu(II), and Pb(II) adsorption onto the CB-G3 were investigated. The adsorption processes can be described using pseudo-second-order kinetic and Langmuir models. The maximum monolayer adsorption capacities were 105.62, 88.82, and 97.87 mg·g −1 for Ag(I), Cu(II), and Pb(II) at 30 °C within 210 min, respectively. Electrostatic interactions and hydrogen bonds are the main mechanisms between metal ions and N atoms. Therefore, the CB-G3 is a promising candidate for Ag(I), Cu(II), and Pb(II) adsorption owing to its splendid ability in easy separation, good adsorptivity, and reusability for efficiently adsorbing Ag(I), Cu(II), and Pb(II) ions.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Applied Sciences-Basel
·
2020
·Vol. 10
·期 3
·948
·
IF 2.474
Yu Tao,Chuan Zhang,Ting Lü,Hongting Zhao
A class of polyethyleneimine (PEI)-functionalized Fe3O4magnetic nanoparticles (MNPs) has been facilely produced through a solvothermal process. The synthetic MNPs have been characterized by multiple technologies and then used for Pb(II) ion sorption from the aqueous media in different conditions. It was found the Pb(II) adsorption behaviors could be well fitted by the pseudo second-order kinetic and Langmuir isotherm models. The maximum Pb(II) adsorption capacity at 25 °C and pH 5.0 was calculated to be 60.98 mg/g. Moreover, effects of temperature, pH, and electrolyte of aqueous phase on the Pb(II) adsorption capacity of MNPs have been carefully examined. The Pb(II) adsorbing capacity was enhanced with temperature or pH rising, but reduced with the addition of various electrolytes. Additionally, the recyclability of synthetic MNPs has been also assessed. The prepared PEI-functionalized MNPs could still maintain good adsorption performance after five cycles of Pb(II) removal. These results indicated that the PEI-functionalized Fe3O4MNPs could be readily synthesized and served as a desirable and economic adsorbent in Pb(II)-contaminated wastewater treatment.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
COLLOID AND POLYMER SCIENCE
·
2014
·Vol. 292
·期 9
·2157-2172
·
IF 2.41
Chen Xing Juan,Cai Jian Chong,Zhang Zheng Han,Liu Li Jia,Yang Guang Lei
A novel cross-linked chitosan-poly(aspartic acid) chelating resin was synthesized by combining chitosan and poly(aspartic acid) derivative with crosslinker. The structure and morphology of the resin containing disulfide bonds were characterized by 1 H NMR, FT-IR, Raman spectra, and SEM. Adsorption of Pb(II) and Hg(II) from aqueous solution by the resulted chelating resin was investigated in batch techniques. The result of the Raman spectra suggests that the disulfide bonds in the resin also play an important role in the adsorption of Pb(II) and Hg(II). The kinetic data were fitted to pseudo-first-order, pseudo-second-order, and intraparticle diffusion models, which is suggestive of following closely the pseudo-second-order kinetic model. Equilibrium data were fitted to Langmuir, Freundlich, and D–R isotherm models. The results of equilibrium isotherm reveal that the empirical Langmuir equation provides an accurate description of the experimental data under the studied concentration range. In addition, thermodynamic and regeneration properties of the adsorbent were also studied.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2020
·Vol. 26
·期 8
·3901-3909
·
IF 2.394
Li Mei,Sun Zhongxuan,Guo Dan,Han Wei,Sun Yang,Yang Xiaoguang,Zhang Milin
The electrode reaction of Pr(III) and coreduction of Pb(II) and Pr(III) were studied on an inert W electrode in eutectic LiCl-KCl to extract Pr from molten salt. The electrode process kinetic of Pr(III) on W electrode was firstly explored employing cyclic voltammetry (CV) and Tafel technique, such as the diffusion coefficient of Pr(III) in eutectic LiCl-KCl and the exchange current density ( j 0 ) for Pr(III)/Pr(0) couple and the electrode reaction activation energy. Then, various electrochemical techniques were used to investigate the coreduction of Pb(II) and Pr(III). Four cathode current peaks ascribed to the formation of Pr x Pb y intermetallic compounds were detected, which indicated that the Pr could deposit on pre-deposited Pb film, react with Pb, and form Pr x Pb y intermetallic compounds. Furthermore, the electrolytic products formed by galvanostatic electrolysis were characterized by scanning electron microscopy coupled with energy dispersive X-ray diffraction, which illustrated the formation of PrPb 3 intermetallic compound in LiCl-KCl-PbCl 2 -PrCl 3 melt.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 86
·45920-45929
·
IF 3.708
Lisha Tan,Jiang Xu,Xiaoqin Xue,Zimo Lou,Jin Zhu,Shams Ali Baig,Xinhua Xu
Silica-coated magnetite (Fe3O4@SiO2) nanoparticles functionalized with amino, imino and sulfonic groups (Fe3O4@SiO2–mPD/SP) were successfully synthesized via a facile chemical oxidative polymerization of m-phenylenediamine (mPD) and m-sulfophenylenediamine-4-sulfonic acid (SP) monomers, and utilized for selective removal of Pb(II) and Cr(VI) from aqueous solutions. It was revealed by the characterizations that the polymers formed on Fe3O4@SiO2 nanoparticles were the true copolymers with a mPD–SP unit, rather than a mixture of mPD and SP homopolymers. Fe3O4@SiO2–mPD/SP nanocomposites could be easily separated from aqueous solutions within 30 s. The maximum adsorption capacities of Pb(II) (83.23 mg g−1) and Cr(VI) (119.06 mg g−1) on Fe3O4@SiO2–mPD/SP nanocomposites were obtained at the mPD/SP molar ratios of 95 : 5 and 50 : 50, respectively. Moreover, satisfactory selective removal of Pb(II) and Cr(VI) from their mixtures with Cu(II) and Ni(II) ions were exhibited by the Fe3O4@SiO2–mPD/SP (95 : 5) and Fe3O4@SiO2–mPD/SP (50 : 50), respectively. The Pb(II) adsorption equilibrium was reached within 5 min by Fe3O4@SiO2–mPD/SP (95 : 5). The adsorption data of Pb(II) and Cr(VI) were both fitted well to the Freundlich isotherm and followed the pseudo-second-order kinetic model. The adsorption mechanism of Pb(II) and Cr(VI) on Fe3O4@SiO2–mPD/SP nanocomposites included five processes, namely: ion-exchange, complexation adsorption, reduction reaction, electrostatic attraction and physical adsorption. The enhanced adsorption performance of nanoparticle-based magnetic adsorbents for selective removal of heavy metal ions can be achieved with such a copolymerization strategy.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2017
·
IF 3.359
Yan He,Qinqin Liu,Jun Hu,Chengxi Zhao,Changjun Peng,Qiang Yang,Hualin Wang,Honglai Liu
Porous organic polymers (POPs), a new class of porous materials constructed by organic molecular building blocks, have attracted much attention. To design POPs with both good porosity and specific-task functionalization is still a critical challenge. In this work, using a simple Friedel-Crafts one-step reaction, one of the most common organic compound methylbenzene monomers were polymerized through the cross-linker formaldehyde dimethyl acetal (FDA) to produce a cost-effective non-functionalized porous polymer (POP-CH 3 ). Moreover, amine groups were further incorporated into the network by the post-synthetic modification method. The resulted porous polymer POP-NH 2 presented highly effective in removing Pb(II) from aqueous solution. The maximum Pb(II) adsorption capacity, q max , evaluated from the Langmuir model was 523.6 mg g −1 . The combination of FT-IR experimental results and the theoretical quantum calculations illustrated that the amine groups ( NH 2 ) can easily form coordination complexes with Pb(II), which were responsible for efficient adsorption. The generated POP-NH 2 could be regenerated effectively and recycled at least four times without significant loss of adsorption efficiency. Hence, the outstanding Pb(II) adsorption capacity, excellent reusability as well as low cost of synthesis create potential polymer POP-NH 2 to be an attractive adsorbent for removing toxic metal ions from aqueous solution.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2021
·
IF 6.165
Jiahao Li,Shiyao Li,Jiaao Chen,Rong Cheng,Fangyuan Chen,Xuli Li,Xuemei Zhang,Tianyu Zeng,Haobo Hou
Many Industrial effluents contain high concentrations of Cd(II) and Pb(II), which are serious problems for causing threat to human health. Adsorption has drawn considerable attention owing to its high efficiency and easy operation. In this paper, nanoscale nitrogen-doped aerogel microspheres (NCA) was synthesised through polymerization of phenolic resin and melamine in an emulsion suspension system. Factors influencing the adsorption properties of NCA and carbon aerogels microspheres (CA) toward Cd(II) and Pb(II) ions were studied, namely, pH, adsorbent content, initial Cd(II) and Pb(II) concentrations, and contact time. Furthermore, three models isotherm including Langmuir, Freundlich, and Sipss and three kinetic models were used in interpreting the adsorption process. NCA exhibited an excellent adsorption property and maximum removal capacity of 935.56 mg·g −1 for Pb(II) and 282.07 mg·g −1 for Cd(II). Results from XPS analysis implied that the amount of Pb absorbed by NCA was higher than that of CA mainly because of the complexing effect of nitrogen-containing functional groups on Pb(II). Furthermore, density functional theory (DFT) calculations confirm that N doping is beneficial to Pb(II) adsorption. These results suggested that NCA can be used as an adsorbent for the removal of Cd(II) and Pb(II) from industrial effluents.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Xueling Liu,Yajing Wang,Xiaofen Wu,Yi Wang,Guozhi Fan,Yanjun Huang,Lei Zhang
In this study, magnetic DTPA-modified chitosan composite microspheres (MDCM) were prepared by reverse emulsion-double crosslinking method (carbodiimide followed by glutaraldehyde) for removal of Pb(II) from aqueous solution. The obtained magnetic adsorbents were characterized by FTIR, SEM, XRD, VSM, BET, and 13 C NMR. The effects of the pH, contact time, initial concentration, and competitive metal cations (Na(I), Ca(II), or Mg(II)) on Pb(II) adsorption were investigated. The results revealed that MDCM exhibited high removal performance over a wide pH range and in the presence of competitive metal cations. The maximum adsorption capacity of MDCM for Pb(II) is 214.63 mg g −1 at pH 3, which is higher than most recently reported magnetic adsorbents. Adsorption kinetics and isotherms can be described by the pseudo-second-order model and Langmuir model, respectively. In addition, MDCM is easy to regenerate and can be reused five cycles with high adsorption capacity. Finally, the adsorption mechanism was further revealed by FTIR and XPS analysis. Overall, MDCM has practical application potential in removing Pb(II) from contaminated wastewater due to its high adsorption efficiency, good reusability, and convenient magnetic separation.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Omega
·
2022
·
IF 4.132
Jialu Huang,Zhiming Ni,Xiaofan Song,Han Li,Xiaolei Chen,Aichuang Zhang,Hu Yang,Yuan Liu,Peng Zhu,Ping Hua,Xiaolei Yuan
PdPb nanocrystals have drawn considerable attention due to their excellent catalytic properties, while their practical applications have been impeded by the severe degradation of activity, which is caused by the adsorption of intermediates (especially CO) during the operation. Herein, we first present porous PdPb alloys with the incorporation of amorphous Pb(OH)2 species as highly active and stable electrocatalysts. Alloying Pd with Pb species is initially proposed to optimize the Pd–Pd interatomic distance and adjust the d-band center of Pd. Importantly, the amorphous Pb(OH)2 species are beneficial to promoting the formation of OHad and the removal of COad. Therefore, PdPb-Pb(OH)2 catalysts show a mass activity of 3.18 A mgPd–1 and keep excellent stability for the ethanol oxidation reaction (EOR). In addition, further CO stripping and a series of CO poisoning experiments indicate that PdPb-Pb(OH)2 composites possess much better CO tolerance benefiting from the tuned electronic structure of Pd and surface incorporation of Pb(OH)2 species.
研究领域:
材料科学
·
电化学
·
催化
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）