CHEMICAL ENGINEERING JOURNAL
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2021
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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
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纳米技术
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可持续发展
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Yaoyao Zhang,Kangze Yuan,Luca Magagnin,Xishe Wu,Zhenyi Jiang,Wei Wang
Schiff base silica aerogels (SCA-X) were synthesized using amino-containing organosilanes and salicylic aldehyde as functional monomers with ethyl orthosilicate hydrolysis condensation as carrier. The influence of SCA-X on the adsorption of Pb (II) and Cu (II) under different adsorption conditions was evaluated, including the effect of solution pH, isotherm, kinetics, thermodynamics and adsorption mechanism. The batch adsorption experiments showed that SCA2 had the optimum adsorption capacity for Pb (II) (357.1 mg/g) and Cu (II) (243.9 mg/g), leading to adsorption equilibrium within 120 min and 360 min, respectively. After six adsorption–desorption cycles, SCA2 still possessed satisfactory adsorption for Pb (II) and Cu (II), demonstrating the reusability of the SCA2 adsorbent material. Kinetic studies indicated that the adsorption process could be described by a pseudo-second-order kinetic model, adsorption isotherms were in accordance with the Langmuir model, indicative of monomolecular layer adsorption. Thermodynamics evaluation revealed the nature of the adsorption process was an endothermic spontaneous process. XPS analysis combined with DFT calculations confirmed that the interaction mechanism between SCA2 and Pb (II) occurred through the coordination between the nitrogen atom donor in the Schiff base and the oxygen atom donor in the benzene ring, while the interaction between SCA2 and Cu (II) occurred mainly through the coordination between the nitrogen atom in the Schiff base and Cu (II). Life Cycle Assessment (LCA) was introduced to analyze the environmental impact of the SCA2 fabrication process and eco-friendly approaches were provided, which eventually provided theoretical evidence for the application of as-prepared material in the handling of heavy metal effluents.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Wei Yang,Mingli Cao
The removal of heavy metal ions from the aqueous environment is an important topic as heavy metal pollution is widely distributed in water bodies, causing serious damage to aquatic ecosystems and worsening the already scarce freshwater resources. In this work, we report the synthesis of novel ZIF-8@GO-COOH composite nanosorbent materials by in situ self-assembly. The physicochemical properties of the composites were investigated using relevant characterisation techniques, and the adsorption capacity of ZIF-8@GO-COOH for copper and lead ions in aqueous solution was tested by batch adsorption experiments. The adsorption behaviour was analysed by combining adsorption kinetics, adsorption isotherm model and Van't Hoff model. The results showed that the adsorption capacities of ZIF-8@GO-COOH for Cu(II) and Pb(II) were 93.26 mg/g and 95.875 mg/g, respectively, when the initial heavy metal ion concentration was 100 mg/L, the adsorption time was 60 min, the temperature was 293 K and the pH conditions were suitable. The high adsorption performance of ZIF-8@GO-COOH was attributed to its surface with abundant oxygen-containing functional groups and excellent specific surface area, which gives it a significant advantage in the removal of heavy metal ions from aqueous solutions.
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高影响因子
Journal of Environmental Chemical Engineering
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2023
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IF 7.7
Hao Wang,Shuai Wang,Shixing Wang,Likang Fu,Libo Zhang
Because of its irreversible toxicity and harm to people's health, lead contamination has gotten a lot of attention. As a result, the development of low-cost, high-performance removal approaches has become a popular issue. In this work, novel metal-organic framework (AMO-MOF) was developed to selectively adsorb Pb(II) from water. AMO-MOF perfectly inherits the structural characteristics of mesoporous materials and its specific surface area is 255.251 m 2 /g. The adsorption reached equilibrium at 180 min and the maximum adsorption capacity of AMO-MOF for Pb(II) was 472.73 mg/g. The adsorption of Pb(II) on AMO-MOF was fitted with pseudo-second-order kinetics and Langmuir isotherm models, indicating that the adsorption was monolayer chemisorption process. Thermodynamic and activation energy ( Ea ) analyses indicate that the monolayer chemisorption of Pb(II) on AMO-MOF was an endothermic process. When multiple cations coexist, AMO-MOF exhibits excellent selectivity for Pb(II). Meanwhile, after repeated used for 5 times, the removal rate can still reach more than 80 %. The adsorption mechanism is mainly the chelation and electrostatic interaction of N and O-containing functional groups on the adsorbent with Pb(II). The excellent adsorption performance of AMO-MOF for Pb(II) makes it have great application potential in practical environmental remediation.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Xiaoyan Duan,Kaiqiang Wang,Lei Wang,Limin Cao,Jianxin Sui,Hong Lin
In this study, a new metal-organic framework adsorbent (UIO-66-NH 2 @TA) which can efficiently and selectively capture lead ions was developed by functionalizing UIO-66-NH 2 with tannic acid (TA) by Michael addition reaction. The structural and morphological properties of the produced adsorbent, as well as its adsorption mechanism for Pb (II) were discussed. The maximum adsorption capacity of Pb (II) was 475.78 mg/g at pH 5.0, which was significantly higher than the adsorption capacity of many adsorbents reported in the literature. In addition, the adsorption isotherms and kinetics conformed to the Langmuir model and pseudo-second-order kinetic model , respectively. The results indicated that the adsorptive behavior of the adsorbent mainly depended on the active sites on the surface of the adsorbents. The UIO-66-NH 2 @TA showed favorable selectivity toward Pb (II) against the interference of coexisting metal ions . It was found that the excellent Pb (II) removal performance of UIO-66-NH 2 @TA was mainly attributed to the synergistic effect of physical adsorption and chemisorption . Moreover, the UIO-66-NH 2 @TA showed extraction efficiencies of 88.01%, 82.44%, 80.20% and 74.99% for Pb (II) with initial concentration of 100 mg/L in river water, sea water, peach juice drink, and grape juice, respectively. This work proved that the UIO-66-NH 2 @TA had a wide application prospect in the field of Pb (II) treatment.
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高影响因子
Journal of Environmental Chemical Engineering
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2023
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IF 7.7
Guodong Zhu,Chengwei Feng,Lin Wang,Chenkai Zhou,Xiaole Weng,Kun Yang
Herein, a three-dimensional porous nanomaterials AuNPs-decorated polyaniline nanowire arrays/carbon nanotube (Au-PANI-array@CNT) was constructed by modified dilute polymerization and redox reaction. The Au-PANI-array@CNT exhibited a larger specific surface area (50.03 m 2 g −1 ) and abundant mesopores (average pore size: 19.6 nm), due to the vertical growth of PANI nanowire arrays on CNT. The Au-PANI-array@CNT composite with a three-dimensional interconnected porous structure exhibited abundant electroactive sites and high adsorption capacity, significantly enhancing the deposition and electrochemical reaction process of heavy metals. The AuNPs embedded on PANI nanowries can provide high catalytic activity and multidimensional electron transport channels, further improving the detection sensitivity. A sensing platform with ultra-high sensitivity (2091, 3890 μA μM −1 cm −2 ) and lower limit of detection (0.18, 0.15 nM) for Cd(II) and Pb(II) determination was developed based on the three-dimensional porous PANI composite. Furthermore, the sensing mechanism of Au-PANI-array@CNT with Cd(II) was explored by XPS and FTIR spectroscopy . The current response only decreased by 5% after being stored at room temperature for 2 months, indicating that the sensor has high reproducibility and stability. Finally, the analysis of drinking water samples verified the excellent practicability of the sensor for the simultaneous measurement of trace levels (nM) of Cd(II) and Pb(II).
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高影响因子
Journal of Environmental Chemical Engineering
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2021
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IF 5.909
Shenwan Wang,Dao Xiao,Xiaoyan Zheng,Lili Zheng,Yang Yang,Haide Zhang,Binling Ai,Zhanwu Sheng
Halloysite/biochar was prepared by co-pyrolysis at different temperatures using coconut shell and halloysite as raw materials. Magnetic adsorbents were prepared through ball-mill extrusion with Fe 3 O 4 and the halloysite/biochar and the capacity of the adsorbents to adsorb Pb(II) from water was evaluated and compared. The effects of pH, contact time, and initial Pb(II) concentration on the adsorption capacity of the magnetic adsorbents for Pb(II) were investigated. The pseudo-second-order ( R 2 =0.9999) and Langmuir isothermal models ( R 2 =0.9906) fit the experimental data well. The prepared samples denotes as MBM-HBC700 exhibited the highest Pb(II) adsorption capacity (833.33 ± 16.71 mg·g -1 ), and the removal efficiency of Pb(II) by the magnetic adsorbents was above 90% after four adsorption–desorption cycles. Complexation, cation exchange, cation–π interaction, precipitation, pore filling and electrostatic adsorption have been proposed as the main removal mechanisms. After applying MBM-HBCs to simulated electroplating wastewater, the contents of Pb(II), Cu(II), Zn(II), and Cr(VI) were significantly lower than the discharge standard of China. The magnetic adsorbents prepared in this study have wide application prospects in the treatment of Pb(II) in wastewater, thus providing a new approach for promoting waste recycling and utilization.
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高影响因子
Journal of Environmental Chemical Engineering
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2023
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IF 7.7
Yueyang Wang,Mingzhu Jin,Weiwei Lu,Fangfen Jing,Xinyang He,Jianchao Xie,Rongtai Yu
The mechanism from the molecular level and the selectivity for the removal of metal ions from aqueous has become a hotspot in current water treatment . In this study, a sulphydryl-modified hollow polymer adsorbent was designed with intrinsic amine and grafted sulphydryl groups for efficient uptake of Cr(VI), As(III), Cd(II), and Pb(II) by taking advantage of their properties of abundant functional groups, discrete hollow chambers, and high porosity. Interestingly, the benzenoid amine/quinoid imine functional groups have a stronger affinity for Cr(VI) than Cd(II) or As(III) and Pb(II). The formation of approximately 65.7% Cr(III) indicates the redox reaction from Cr(VI) to Cr(III). The electron-donating comes from benzenoid amine and oxidized to quinoid imine or protonated oxidized nitrogen units (-N = + ) with Cr(VI) reduced to Cr(III) for the increase of more than double of quinoid imine and a new functional group of -N = + . Ion exchange between –COO - groups and As(III)/Cd(II), the chelation of –SH groups for Pb(II)/As(III) are plausible mechanisms.
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高影响因子
LANGMUIR
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2023
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IF 3.9
Yueyang Wang,Weiwei Lu,Fangfen Jing,Mingzhu Jin,Xinyang He,Yuchen Xue,Yajun Hu,Rongtai Yu
The development of efficient adsorbents for heavy metal pollution, especially five toxic heavy metals, has attracted great research interest. Polymer-based adsorbents have aroused research value for their abundant functional groups and high porosity to the ability to capture metal ions. We designed a sulfhydryl-functionalized polymer microcomposite to take up Cr(VI), As(III), Cd(II), and Pb(II). The adsorption capacity achieved was 64.2 mg g–1 for Cr(VI), 44.9 mg g–1 for As(III), 35.5 mg g–1 for Cd(II), and 18.2 mg g–1 for Pb(II). Langmuir and Sips isotherm model is dominant for As(III), Cd(II), and Pb(II) adsorption. Pseudo-second-order kinetic models can better describe the adsorption behavior of Cr(VI), implying that chemisorption is accompanied by Cr(VI) adsorption. Cr(VI) simultaneous reduction to Cr(III) through the benzenoid amine oxidate pathway was the dominant mechanism, precipitation for Cd(II) adsorption was convinced, and chelation between As(III)/Pb(II) and─SH group and complexation between Pb(II) and C═O or benzene hydroxyl were a plausible mechanism for As(III) and Pb(II) adsorption.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Chen Wang,Chao Xiong,Yali He,Chen Yang,Xiteng Li,Jianzhong Zheng,Shixing Wang
A novel magnetic Zr-MOF named Ni 0.6 Fe 2.4 O 4 -UiO-66-PEI was synthesized by modifying UiO-66-NH 2 with Ni 0.6 Fe 2.4 O 4 and polyethyleneimine and its sorption characteristics for two representing heavy metals Pb(II) and Cr(VI) in water were examined. This material showed good thermal stability and was sufficiently magnetic to allow effective solid-liquid separation. The material had a maximum adsorption capacity of 273.2 mg/g for Pb(II) at pH 4.0 and 428.6 mg/g for Cr(VI) at pH 3.0, as obtained from the model fitting by the Hill equation. The sorption kinetics for both heavy metals on the material was fast, with adsorption equilibrium established in 60 min and 30 min for Pb(II) and Cr(VI), respectively. Model fitting of the kinetic data showed that Pb(II) and Cr(VI) sorption on Ni 0.6 Fe 2.4 O 4 -UiO-66-PEI followed the pseudo-second-order model. This material had good selectivity for competing ions, and still hold fairly good binding capacities after 5 times of regeneration. Adsorption mechanisms for Pb(II) and Cr(VI) by Ni 0.6 Fe 2.4 O 4 -UiO-66-PEI were proposed by analyzing FTIR, XPS and the electrokinetic property of the material. Specifically, Pb(II) adsorption on Ni 0.6 Fe 2.4 O 4 -UiO-66-PEI could be attributed to chelation of Pb(II) with the imine/amine functional groups in the material’s matrix, while Cr(VI) adsorption might stem from a combination of electrostatic attraction, chelation and redox reaction. It seems that Ni 0.6 Fe 2.4 O 4 -UiO-66-PEI could be used as a green and environmental-friendly material for heavy metals removal, particularly from acidic water streams.
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高影响因子
Journal of Environmental Sciences
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2021
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IF 5.565
Wen Zhou,Jiale Deng,Zhen Qin,Ruihua Huang,Yi Wang,Shanshan Tong
Toxic heavy metal ions, valuable noble metal ions and organic dyes are significant concerns in wastewater treatment. In this work, MoO 3 nanobelts (MoO 3 NBs) prepared by solvothermal method and MoS 2 nanoarrays (MoS 2 NAs) constructed using MoO 3 NBs precursor were proposed to effectively remove heavy/noble metal ions and organic dyes, such as Pb (II) , Au (III) and Methylene Blue (MB). The two adsorbents exhibited the excellent adsorption capacity towards Pb (II) , Au (III) and MB. The maximum removal capacity of Pb (II) and MB on MoO 3 NBs was 684.93 mg/g and 1408 mg/g, respectively, whereas that of Au (III) and MB on MoS 2 NAs was 1280.2 mg/g and 768 mg/g, respectively. Furthermore, the thermodynamic parameters were calculated from the temperature-dependent curves, suggesting that the removal of Pb (II) and Au (III) on both adsorbents was spontaneous and endothermic. The new adsorbents introduced here were high adsorption activity, ease of fabrication, high scalability, good chemical stability, great repeatability and abundant and cheap supply, which were highly attractive for wastewater treatment.
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PubMed
高影响因子
MICROCHEMICAL JOURNAL
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2021
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IF 4.821
Hui Li,Jie Zhao,Shifan Zhao,Guofeng Cui
Developing a reliable, sensitive and portable electrochemical sensor for precise determination of trace heavy metal ions in water is an attractive challenge. In this work, an integrated three-electrode sensor based on screen–printed gold working electrode (SPAuE) ex-situ electroplated bismuth film was developed via a facile and simple process for the determination of trace Pb(II), Cd(II), and Zn(II) by square wave anodic stripping voltammetry (SWASV). The bismuth film was deposited on SPAuE at a potential of −0.08 V (Bi/SPAuE −0.08V ). The results exhibited the sensor with a wide linear range (from 1 to 120 μg L -1 ) for the simultaneous detection of these three heavy metal ions. Besides, the detection limits of Pb(II), Cd(II), and Zn(II) for the sensor were respectively found to be 0.04 μg L −1 , 0.02 μg L −1 , and 0.05 μg L −1 (S/N = 3). The proposed sensor revealed good anti-interference ability, satisfactory repeatability with RSDs of less than 2.5% (n = 12), excellent reproducibility with RSDs of less than 2.5% (n = 6), and considerable stability. The detection accuracy of the Bi/SPAuE −0.08V based sensor was further evaluated via atomic absorption spectroscopy (AAS). Due to its simplicity in process, high detection performance and excellent reliability, such sensors are expected to find utility in portable heavy metal detection applications.
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高影响因子
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