RSC Advances
·
2020
·Vol. 10
·期 66
·40196-40205
·
IF 3.119
Liwen Zheng,Yongchao Gao,Jianhua Du,Wen Zhang,Yujie Huang,Leilei Wang,Qingqing Zhao,Xiangliang Pan
We report here the preparation process of a recyclable magnetic biochar functionalized with chitosan and ethylenediaminetetraacetic acid (E-CMBC). This prepared biochar was then evaluated regarding its adsorption performance for Pb(II) from an aqueous solution along with the potential adsorption mechanisms behind this process. XRD and SEM analyses showed that the magnetite particles were successfully embedded into biochar and the subsequent surface coating of chitosan and ethylenediaminetetraacetic acid modification were also successful. The effects of the adsorbent dosage, ionic strength, initial solution pH, and contact time, on adsorption kinetics, adsorption isotherms, adsorption thermodynamics and regeneration performance were investigated. The removal of Pb(II) was dramatically improved to 156.68 mg g−1 compared with that by unmodified pristine biochar (10.90 mg g−1) at pH 3.0. In the range of pH 2.0–5.0, the adsorption performance of Pb(II) by E-CMBC remained above 152.50 mg g−1, which suggested that the adsorption capacity of the novel sorbent was not impacted by the competing adsorption of hydrogen cations under acidic conditions. The adsorption process could be well described by the Avrami fractional-order and Langmuir models. Thermodynamic analysis proved that the adsorption process was spontaneous and endothermic. The magnetic strength of E-CMBC was measured as 3.1 emu g−1, suggesting that the consumed E-CMBC could be separated from water by an external magnet. A regeneration study showed that after three cycles of adsorption–desorption, 78.60% of the sorbent was recovered and 97.26% of the adsorption capacity was retained. The adsorption mechanism investigation indicated that Pb(II) adsorption was mainly due to the presence of functional amides and carboxyl groups of E-CMBC forming strong chemical complexation. In conclusion, E-CMBC is a novel, recyclable, and highly efficient adsorbent for removal of Pb(II) from aqueous solution.
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PubMed
高影响因子
Materials
·
2020
·Vol. 13
·期 5
·1241
·
IF 3.057
Xiang Li,Yan Xiong,Ming Duan,Haiqin Wan,Jun Li,Can Zhang,Sha Qin,Shenwen Fang,Run Zhang
For further the understanding of the adsorption mechanism of heavy metal ions on the surface of protein-inorganic hybrid nanoflowers, a novel protein-derived hybrid nanoflower was prepared to investigate the adsorption behavior and reveal the function of organic and inorganic parts on the surface of nanoflowers in the adsorption process in this study. Silk fibroin (SF)-derived and copper-based protein-inorganic hybrid nanoflowers of SF@Cu-NFs were prepared through self-assembly. The product was characterized and applied to adsorption of heavy metal ion of Pb(II). With Chinese peony flower-like morphology, the prepared SF@Cu-NFs showed ordered three-dimensional structure and exhibited excellent efficiency for Pb(II) removal. On one hand, the adsorption performance of SF@Cu-HNFs for Pb(II) removal was evaluated through systematical thermodynamic and adsorption kinetics investigation. The good fittings of Langmuir and pseudo-second-order models indicated the monolayer adsorption and high capacity of about 2000 mg g−1of Pb(II) on SF@Cu-NFs. Meanwhile, the negative values ofΔrGm(T)θandΔrHmθproved the spontaneous and exothermic process of Pb(II) adsorption. On the other hand, the adsorption mechanism of SF@Cu-HNFs for Pb(II) removal was revealed with respect to its individual organic and inorganic component. Organic SF protein was designated as responsible ‘stamen’ adsorption site for fast adsorption of Pb(II), which was originated from multiple coordinative interaction by numerous amide groups; inorganic Cu3(PO4)2crystal was designated as responsible ‘petal’ adsorption site for slow adsorption of Pb(II), which was restricted from weak coordinative interaction by strong ion bond of Cu(II). With only about 10% weight content, SF protein was proven to play a key factor for SF@Cu-HNFs formation and have a significant effect on Pb(II) treatment. By fabricating SF@Cu-HNFs hybrid nanoflowers derived from SF protein, this work not only successfully provides insights on its adsorption performance and interaction mechanism for Pb(II) removal, but also provides a new idea for the preparation of adsorption materials for heavy metal ions in environmental sewage in the future.Keywords:silk fibroin;hybrid nanoflowers surface;Pb(II) removal;interaction mechanism
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PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Chao Xiong,Shixing Wang,Peng Hu,Liyun Huang,Can Xue,Zujin Yang,Xiantai Zhou,Yongqing Wang,Hongbing Ji
We report an efficient, reusable, and selective 6-aminothiouracil (ATA)-modified Zr(IV)-based adsorbent (defined as UiO-66-ATA(Zr)) for lead ion removal in water. The adsorption equilibrium time and the maximum sorption capacity of UiO-66-ATA(Zr) for Pb(II) are, respectively, 120 min and 386.98 mg/g at pH 4 and 298 K. The Pb(II) removal rate reaches 96% at 60 min and exceeds 99% at the equilibrium state in the pH range of 2.0–5.8. Hill and pseudo-second-order models can well describe the sorption process. Pb(II) adsorbing onto UiO-66-ATA(Zr) is an irreversible, favorable chemisorption process with multimolecule participation and film diffusion control. The calculations of density functional theory, the experimental results, and the characterization analyses suggest that the binding mechanisms are the chelation and ion-exchange/electrostatic interactions between hydroxyl/amino/sulfhydryl groups of UiO-66-ATA(Zr) and Pb(II). Besides, UiO-66-ATA(Zr) has a better affinity to Pb(II) than the coexisting ions in water and an excellent repeatability at eight cycles of adsorption. Moreover, the thermodynamic study shows that UiO-66-ATA(Zr) adsorbing Pb(II) is an endothermic reaction. Thus, UiO-66-ATA(Zr) is a prospective sorbent for Pb(II) removal under the initiative of environmental protection and water purification, and this work may also provide an idea for industrial catalysis.
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高影响因子
Desalination and Water Treatment
·
2025
·
IF 1
Jingyi Chen,Xiaoxue Zhang,Junsheng Liu,Shan Jiang,Chunyu Ji,Jie Zhang
A series of novel polyethyleneimine/graphene oxide (PEI@GO) membranes were prepared and their adsorptions for heavy metal ions in mixed solutions were examined. It was found that they had good sorption performances for Pb(II), Cu(II), and Zn(II) in water. Their adsorptions for Pb(II), Cu(II), and Zn(II) obeyed the first-order kinetic modeling, dominating a physical style. Meanwhile, the fitting of intra-particle diffusion showed that Pb(II) and Cu(II) did not conform to the intra-particle diffusion stage, whereas Zn(II) did. Moreover, it was confirmed that the sorption of PEI@GO membranes for Pb(II), Cu(II), and Zn(II) followed the Langmuir isotherm modeling, and the maximal values could reach 79.6 mg/g for Pb(II), 35.01 mg/g for Cu(II), and 32.27 mg/g for Zn(II), respectively. The calculation of thermodynamic parameters indicated that these adsorptions were spontaneous and endothermic processes. Further, the investigation of PEI@GO membranes for Pb(II), Cu(II), and Zn(II) in ternary mixed systems evidenced that Zn(II) can be preferentially removed via step-by-step mode. In addition, the exploration of sorption mechanism using XPS and FTIR analyses showed that ligand interactions were involved in the adsorptive removal of Pb(II), Cu(II), and Zn(II). This study discloses that PEI@GO membranes are promising adsorbents for the removal of heavy metal ions from water.
研究领域:
环境科学
·
材料科学
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水处理
·
吸附技术
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DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Dongfang Wang,Jie Wu,Ruohan Li,Xianghai Kong,Pan Zhao,Yanping Zhu,Zerong Song,Jinjing Xu,Ziyu You,Yuhao Wang,Qingchuan Wu,Dongqing Cai
White pollution, excessive heavy metals, and fertilizer leaching have become key issues restricting the development of agriculture. In this work, we prepared multifunctional starch mulch film (SMF/MAP/FeS) by loading ferrous sulfide (FeS) and monoammonium phosphate (MAP) onto commercial starch mulch film using poly(vinyl alcohol) for bonding. The removal efficiencies of Pb(II)/Cr(VI) for SMF/MAP/FeS could reach 97% and 93% in the aqueous solution. The adsorption isotherm, thermodynamic, and kinetics studies indicated that the adsorption process was an endothermic multimolecular-layer chemisorption. The main removal mechanisms for Pb(II)/Cr(VI) of SMF/MAP/FeS were precipitation and redox reactions. In addition, SMF/MAP/FeS not only possessed great thermal insulation and moisturizing properties but also could realize the slow release of NH4+. Furthermore, the maximum release rate of NH4+ for SMF/MAP/FeS could reach 93.4% during Pb(II)/Cr(VI) removal. At the same time, SMF/MAP/FeS has a good degradability at 50 d. A pot experiment indicated that SMF/MAP/FeS had a detoxifying effect on the Pb(II)/Cr(VI)-contaminated soil to promote the growth of pakchoi. Therefore, this study not only solves the problem of plastic and heavy metal pollution but also realizes the slow release of nutrients.
研究领域:
环境科学
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农业工程
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土壤修复
·
高分子材料
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污染控制
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可持续农业
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PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 27
·期 11
·11683-11696
·
IF 3.056
Li Zhenyuan,Pan Zhidong,Wang Yanmin
Ternary amino-functionalized magnetic illite-smectite (AMNI/S) nanocomposites were prepared via integrating two-dimensional illite-smectite nanoflakes (NI/S), magnetite nanoparticles (Fe 3 O 4 ), and 3-aminopropyltriethoxysilane (APTES). The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and vibrating sample magnetometry (VSM). The results show that Fe 3 O 4 nanoparticles can be well dispersed on NI/S flakes and the hydrolyzed APTES molecules can simultaneously bond to the hydroxyl groups of Fe 3 O 4 and NI/S. Due to the synergetic effect, magnetic NI/S composite can graft more amount of APTES molecules rather than Fe 3 O 4 nanoparticles or NI/S alone. When the mass ratio of NI/S:Fe 3 O 4 is 1:1, the saturation magnetization of AMNI/S-1 is 17.4 emu/g, facilitating the efficient magnetic separation in aqueous solution. Also, AMNI/S-1 shows a maximal adsorption amount of Pb(II) ions of 227.8 mg/g calculated by the Langmuir model. The effects of initial concentration of Pb(II) ions, pH value, adsorption time, and temperature on the adsorption amount of Pb(II) ions were investigated. The adsorption kinetic models and isotherm models were applied to analyze the adsorption of Pb(II) ions, respectively. The thermodynamic analysis reveals that the adsorption of Pb(II) onto AMNI/S-1 is spontaneous and endothermic in nature. The mechanism for the adsorption of Pb(II) ions onto AMNI/S-1 is due to the surface complexation of Fe 3 O 4 and NI/S, and the chelation of amine groups (–NH 2 ). AMNI/S-1 can be efficiently reused and the regenerated AMNI/S-1 remains 82.91% of initial adsorption capacity after 6-cycle adsorption/desorption process. Thus, ternary AMNI/S-1 could be used as a prospective effective adsorbent.
研究领域:
环境科学
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材料科学
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PubMed
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2015
·Vol. 25
·期 4
·879-885
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IF 1.16
Wu Kai-Fei,Jiang Fen,Bai Xian-Li,Mo Shao-Yin,Qin Gui-Fang,Feng Yu
Solvothermal reaction of Pb(NO 3 ) 2 with terephthalate acid afforded one new inorganic–organic hybrid framework, [Pb(PBDC)] n ( 1 ) (H 2 PBDC = terephthalic acid). X-ray analysis shows that compound 1 crystallizes in orthorhombic space group Pbca and the two carboxy group of terephthalate acid adopt rare coordination modes. A noticeable point in this paper that compound 1 exhibits preferable catalytic property on degradation of Rhodamine B. The phase purity of the as-synthesized sample was confirmed by powder X-ray diffraction. Moreover, satisfactory elemental analysis, IR spectra, and thermogravimetric analysis were obtained.
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高影响因子
Toxics
·
2022
·Vol. 10
·期 9
·489
·
IF 4.472
Chunlin He,Yun Liu,Chunhui Zheng,Yanming Jiang,Yan Liao,Jiaxin Huang,Toyohisa Fujita,Yuezhou Wei,Shaojian Ma
Utilising waste amine-oxime (WAO) resin through microwave semi-carbonization, a carbon adsorbent (CA) was obtained to remove Pb(II). After microwave treatment, the pore size of the skeleton structure, three-dimensional porous network, and lamellar pore structure of WAO was improved. The distribution coefficient (Kd) of Pb(II) onto CA is 620 mL/g, and the maximum adsorption capacity of Pb(II) is 82.67 mg/g after 20 min of WAO microwave treatment. The adsorption kinetics and adsorption isotherms conform to the quasi-second-order kinetic equation and Langmuir adsorption isotherm model, respectively. The surface of MT-WAO is negatively charged and the adsorption mechanism is mainly electrostatic interaction. Pb(II) elution in hydrochloric acid solution is more than 98%, and its recovery is high at 318 K and for 1 h.
研究领域:
环境化学
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吸附科学
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资源回收利用
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水污染治理
·
功能材料
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高影响因子
Journal of Macromolecular Science Part A-Pure and Applied Chemistry
·
2012
·
IF 0.887
Dajian Huang,Wenbo Wang,Yuru Kang,Aiqin Wang
A series of granular pH-sensitive semi-interpenetrating polymer network (semi-IPN) hydrogels based on chitosan (CTS), acrylic acid (AA) and gelatine (GE) were utilized for the adsorption and recycle of Pb(II) from aqueous solutions. The composite hydrogels have been characterized by FT-IR and TGA. The effects of contact time, pH value and initial Pb(II) concentration on the adsorption were investigated. Results indicated that the adsorption capacity of the hydrogel increased with increasing pH value and initial Pb(II) concentration, and a pH-sensitive adsorption characteristic was presented. The adsorption rate of the semi-IPN hydrogels on Pb(II) is fast with an adsorption rate constant of 14.9790 mg/(g·s), and adsorption equilibrium could be reached within 10 min. The adsorption isotherms of the hydrogels for Pb(II) could be described well by the Langmuir equation, rather than the Freundlich equation. The as-prepared hydrogels showed good reusability with 0.05 mol/l HNO3 solutions as the desorbing agent and 0.1 mol/l NaOH solutions as the regeneration agent, respectively. After five consecutive adsorption-desorption processes, the semi-IPN hydrogel with 20 wt% GE may reach 85.26% of its initial adsorption capacity. In addition, the adsorbed Pb(II) can be quantitatively recovered by simply eluting the hydrogel with dilute HNO3 solution, and a recovery ratio of 89.27% was reached for the semi-IPN hydrogel. The satisfactory adsorption amount is mainly derived from the chelating of functional groups (i.e. –COO− and –NH2) with Pb(II) ions. The hydrogel adsorbents exhibited excellent affinity for Pb(II), and can be applied to treat wastewater containing heavy metal ion and simultaneously recover the valuable metal sources.
研究领域:
环境科学
·
材料科学
·
水处理
·
高分子化学
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重金属修复
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Xuan Zhou,Can Jin,Guifeng Liu,Guomin Wu,Shuping Huo,Zhenwu Kong
With the increasing concern in sustainable development and environmental governance, the biomass-based magnetic materials containing sufficient active sites and regular structure can be regarded as the high-performance adsorbents for removal of heavy metal pollutants from wastewater. In this study, we reported the tunable covalent binding of lignin onto amine-functionalized magnetic nanoparticles (AMNP) using cyanuric chloride as a chemoselective cross-linker. The chemical structures, morphologies, and magnetic properties of the synthesized lignin-based magnetic adsorbents (L1@MNP and L2@MNP) were comprehensively characterized. Batch adsorption experiments were conducted to investigate various effecting factors, including pH, contact time, solution concentration and temperature. With the higher component ratio of AMNP/lignin, L1@MNP displayed higher adsorption affinity ( q max = 111.23 mg/g) and selectivity towards Pb(II) than L2@MNP ( q max = 81.97 mg/g). The adsorption kinetics agreed well with the pseudo-second-order kinetic model, and the thermodynamic adsorption behaviors were found to be an endothermic and spontaneous process. In addition, the presence of magnetic cores in the network facilitated the fast recovery of both two magnetic adsorbents after the adsorption process, owing to the good superparamagnetic properties for L1@MNP (40.06 emu/g) and L2@MNP (26.95 emu/g). Furthermore, the core–shell magnetic adsorbents also showed superior stability even in an acidic solution, of which the removal efficiency could well maintain over 85% after 5 cycles. This work provides a facile strategy for the design and synthesis of lignin-based adsorbents with flexible nanoparticles as a building block for the potential application prospects in Pb(II) removal from wastewater.
研究领域:
环境科学
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材料科学
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化学工程
·
纳米技术
·
可持续发展
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2020
·Vol. 167
·期 14
·142505
·
IF 3.721
Wei Han,Wenjuan Wang,Mei Li,Yangyang Meng,Wenjing Ji,Yang Sun
To recover Gd from LiCl-KCl eutectic, the coreduction mechanism of Gd(III) with Pb(II) was investigated using electrochemical methods. The formation potentials related to the formation of three Gd-Pb intermetallics were detected by cyclic voltammetry, square wave voltammetry and chronopotentiometry, and the formation mechanism of Gd-Pb compounds could be described as xPb(II) + 2xe− = xPb. Meanwhile, the electroreduction of Gd on liquid Pb electrode was explored. The diffusion coefficient of Gd metal in liquid metallic Pb was determined by anodic chronopotentiometry. The kinetic parameters of Gd(III)/Gd(in Pb) couple in the temperature range from 723 K to 873 K were determined employing linear polarization (LP) method. Based on the relationship of exchange current density and temperature, the reaction activation energy was estimated to be 23.17 kJ mol−1. In addition, the recovery of Gd from molten salts was performed assisted by liquid Pb electrode by constant potential electrolysis (CPE) and constant current electrolysis (CCE). The products characterized using XRD, SEM with EDS are comprised of GdPb3 and Pb phases. The concentration change of Gd during CCE process was monitored by ICP-AES, and the recovery rate was estimated. The results showed that Gd concentration decreased and recovery rate increased with the duration.
研究领域:
材料科学
·
电化学工程
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高影响因子
Journal of Cleaner Production
·
2020
·
IF 7.246
Song Cheng,Baolin Xing,Changliang Shi,Yanhe Nie,Hongying Xia
A low-cost and selective adsorbent (referred to as CC-CCW@DM) is prepared by modifying crofton weed using 1,3-diaminoguanidine monohydrochloride to achieve Pb(II) removal. Fourier transform infrared spectroscopy analysis results indicate that 1,3-diaminoguanidine monohydrochloride is successfully grafted in the crofton weed after modification. The Pb(II) adsorption process is investigated by adsorption isotherm/kinetic models and adsorption thermodynamics. The adsorption kinetic data are well fitted by the pseudo-second-order model. The adsorption equilibrium data can be better described by the Hill and Redlich-Peterson isotherm models. The maximum Pb(II) adsorption is 234.60 mg/g at a pH of 5 based on the Hill isotherm model. An adsorption thermodynamic study shows that the Pb(II) adsorption process is spontaneous, with △G 0 values ranging from −25.85 to −32.52 kJ/mol at 298–318 K. CC-CCW@DM has good selectivity for Pb(II) adsorption in wastewater. Recycling experiments show that Pb(II) removal is 93.14% after three cycles. In addition, the adsorption mechanism is systematically studied. The density functional theory calculation results show that there are three ways to combine Pb(II) with N on CC-CCW@DM. In summary, CC-CCW@DM is a selective and reusable adsorbent with a high adsorption capability.
研究领域:
环境科学
·
化学工程
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高影响因子
危险品化学品经营许可证（带存储）