Scientific Reports
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2017
·Vol. 7
·期 1
·1-11
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IF 4.259
Wang Yaoguang,Wu Di,Wei Qin,Wei Dong,Yan Tao,Yan Liangguo,Hu Lihua,Du Bin
In this study, branched polyethylenimine (PEI) enhanced magnetic carboxymethyl chitosan (MCMC-PEI) was synthesized and applied as adsorbent for the rapid removal of Pb(II) from aqueous solution. The successful synthesis of the adsorbent was proved by scanning electron microscope (SEM), Fourier transform infrared spectrum (FTIR) and X-ray powder diffraction (XRD). Simultaneously, the effect of the parameters such as initial concentration, adsorbent mass and pH of the solution on the removal of Pb(II) was studied by using response surface methodology (RSM). And central composite design (CCD), which is a widely used form of RSM, was employed in the experimental design procedure. The adsorption results revealed that the adsorption process could reach equilibrium rapidly within 10 min. Furthermore, the adsorption kinetic data could be well described by pseudo-second order model. The maximum adsorption capacity was 124.0 mg/g according to the Langmuir-Freundlich model, which fitted the adsorption isotherm of Pb(II) better than Langmuir model and Freundlich model, respectively. Thermodynamic studies (Δ G < 0, Δ H < 0, Δ S > 0) implied a spontaneous and exothermic process in nature. Meanwhile, the fabricated adsorbent exhibited excellent reusability. Therefore, the excellent adsorption property of MCMC-PEI made it a promising application in water 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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水处理
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DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Wenya Shi,Jie Yang,Yuyang Guo,Zhaoyu Zhang,Hualin Li,Han Guo,Jianqiu Deng,Qingrong Yao,Lichun Cheng,Qianxin Long
Industrial wastewater containing heavy metal ions has become an urgent problem to be solved due to its environmental persistence and bioaccumulation. In this study, powdered adsorbent (DE/CBC) and spherical adsorbent (SA@DE/CBC) were prepared from natural diatomite (DE), crab shell biochar (CBC) and sodium alginate (SA) as raw materials, and were used to adsorb Pb(II) from wastewater. The adsorption isotherm fitting showed that the experimental process of DE/CBC and SA@DE/CBC conformed to the Langmuir model, and the maximum adsorption capacity of the monolayer reached 1155 mg/g and 365 mg/g, respectively. The pseudo-first-order kinetic model showed better fitting for the two adsorbents, and the diffusion rate was controlled by multiple steps. Compared with most traditional composite adsorbents, DE/CBC and SA@DE/CBC can achieve 98 % and 93 % adsorption rates at relatively high Pb(II) concentrations, and maintain 83 % and 84 % high adsorption capacity after 10 adsorption–desorption cycles, demonstrating superior Pb(II) adsorption performance and excellent structural stability. The spherical morphology not only effectively solves the problems of adsorbent recovery and secondary pollution prevention and control, but also plays a role in protecting the structure and active sites of powdery materials, making it more durable and practical. Collectively, the developed composite not only enables high-value-added utilization of biowaste but also demonstrates cost-effectiveness and excellent reusability, providing a sustainable remediation strategy for lead-contaminated water systems.
研究领域:
环境科学
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材料工程
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化学工程
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水处理技术
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吸附过程
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DOI
高影响因子
DIAMOND AND RELATED MATERIALS
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2022
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IF 3.806
Yao Liu,Chunwen Chang,Qiang Xue,Rong Wang,Lingxia Chen,Zeyu Liu,Lin He
Since lead is teratogenic, carcinogenic and mutagenic, people pay increasing attention to lead contamination in water environment. In this work, a novel electrochemical sensor was developed to detect Pb(II) ion in water by PPy , MOFs and bismuth film (BF) modify GCE . Scanning electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, electrochemical impedance spectroscopy , contact angleanalyses, cyclic voltammetry and differential pulse anodic stripping voltammetry were used to characterize the BF-PPy/UIO-66-NH 2 /GCE surface, revealing the physical and electrochemical properties of the electrode. MOFs increased the specific surface area and adsorption site of the electrode. The PPy enhanced the conductivity of the composites materials. MOFs and PPy synergistically promoted the electrochemical performance of the electrode. The deposition potential, deposition time , solution pH and Bi (III) concentration were optimized to determine the optimal detection condition. The electrode has a wide linear range (0.5 to 10 μg/L) with a low detection limit (0.05 μg/L). This electrode also has good anti-interference, repeatability and stability. Besides, it has been successfully applied to the detection of actual water samples. The recovery rates ranged from 95.4 % to 102.8 % with a relative standard deviation (RSD) less than 4.40 %. Our results provide an insight on efficient and rapid detection of Pb(II) ions in water environment in the future.
研究领域:
环境科学
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分析化学
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电化学
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水质监测
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Rui Wang,Qiu-hui Hu,Qiu-yue Wang,Ya-li Xiang,Shuang-hui Huang,Yong-zhen Liu,Shu-yu Li,Quan-liang Chen,Qing-han Zhou
The development of membrane for heavy metal ion removal in water treatment is still impeded by low adsorption efficiency, poor selectivity, and deficient recyclability, which has gained great interests in both laboratorial research and industrial application. Herein, our aim is to fabricate the magnetic ion-imprinted PAN membranes (MII-PMs) based on polyacrylonitrile electro-spun nanofibers with improved adsorption ability, selectivity, and recyclability for efficient and selective removal of Pb(II) from water. The chemical structure and chemo-physical properties of the as prepared MII-PMs were characterized. Remarkably, in competitive adsorption experiment the MII-PMs demonstrated a much higher adsorption capacity towards Pb(II) than other interfering metal ions with the selective order of Pb 2+ >Cu 2+ >Mg 2+ >Co 2+ >Ni 2+ >Cd 2+ >Zn 2+ >Na + >K + . In investigation of the adsorption mechanism towards Pb(II), the equilibrium adsorption data of MII-PMs fitted better with Freundlich isotherm equation, and the kinetic parameters matched well with pseudo-second-order mode. In regeneration and reusability experiment, the MII-PMs could be regenerated with eluting solution and displayed good adsorption capacity towards Pb(II) during 6 adsorption–desorption cycles. Only small amount of Fe ions was leached out after the regeneration experiments. Generally, the as prepared magnetic ion-imprinted membrane with improved adsorption capability, high selectivity, and excellent reusability towards Pb(II) ions can be utilized as a promising and efficiently potential adsorbent in actual water treatment.
研究领域:
环境科学
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材料科学
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水处理
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纳米技术
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Ruilu Yang,Qi Zhang,Jian Shi,Yaping Zheng,Dechao Wang,Jian Zhang,Siyuan Liu,Zhuting Fu
The first example of a magnetic loading functional porous liquid (PL) by employing hollow silicon dioxide (HS) loaded with Fe 3 O 4 as the porous guest, (3-glycidyloxypropyl) trimethoxysilane (KH560) and polyetheramine M2070 as hindered sterically solvents was demonstrated in this paper. This nanoadsorbent (Fe 3 O 4 @HS-PL) was prepared for the decontamination of aqueous solutions from Cu(II) and Pb(II) heavy metals. The hindered sterically solvents ( i.e. , the flexible oligomer chains) endow the Fe 3 O 4 @HS porous guest with a superior flowing behavior at ambient temperature. Various approaches were applied to confirm the morphology, structure and properties of the resultant Fe 3 O 4 @HS-PL. More significantly, the adsorption behavior of Cu(II) and Pb(II) in aqueous solution by Fe 3 O 4 @HS-PL was studied in detail. As expected, combined with the cavity structure from porous guest and amine groups from flexible organic flow layer, Fe 3 O 4 @HS-PL exhibited excellent adsorption capacities of 322.58 and 357.14 mg·g −1 for Cu(II) and Pb(II), respectively, at 298 K, pH 8 and initial concentration of 20 mg·L -1 . The obtained HS and Fe 3 O 4 in Fe 3 O 4 @HS-PL magnetic nanoadsorbent presented average particles size ascertained to be ca. 200 nm and 30 nm, respectively. Moreover, the Freundlich model and pseudo-first-order model has described the adsorption process and adsorption kinetics . The parameters in thermodynamic experiment signified the spontaneity and endothermic properties of the adsorption. Moreover, magnetic loading endowed the Fe 3 O 4 @HS-PL with a superior regeneration performance. A variety of mechanisms containing coordination interaction, porous guest absorption, electrostatic interaction , steric effect and entropy are simultaneously realized in this novel adsorption system. Therefore, the introduction of PLs adsorbents into heavy metal adsorption systems through the construction of PLs materials by magnetic loading and surface amination is of great significance in the field of heavy metal adsorption, eventually starting a new time of pushing forward the development of novel adsorbents for decontamination of aqueous solutions from heavy metal ions.
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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产品关联
DOI
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
Varney Edwin Johnson,Qi Liao,Bob Wisdom Jallawide,Richmond Anaman,Charles Amanze,Peicheng Huang,Wei Cao,Chunlian Ding,Yan Shi
Efficient removal of arsenic (As) and lead (Pb) from industrial wastewater has long been a critical environmental issue due to their serious risk to human health. Therefore, in this work, a modified banana peel biochar (MBPB) was prepared by mixing calcium nitrate , diammonium hydrogen phosphate , sulfuric acid, ferric nitrate with dehydrated banana peel biochar as adsorbent for As(V) and Pb(II) removal in wastewater, and their absorption mechanism was investigated. SEM-EDS, TEM, FTIR , XRD , XPS , BET, kinetic, and isothermal characteristics of MBPB and pristine banana peel biochar (PBPB) were conducted. The behavior of both metal ions on MBPB and PBPB was well explained by the pseudo-second-order kinetic with Langmuir and Freundlich models. We found that the two biochar’s behaviors were mixture processes of monolayer and multilayer adsorption , achieving maximum capacities as determined by the Langmuir model of 39.5 mg g −1 (MBPB-As), 33.2 mg g −1 (MBPB-Pb), 30.8 mg g −1 (PBPB-Pb), and 23.5 mg g −1 (PBPB-As), with maximum efficiencies of 98.7% (MBPB-As) and 90.3% (MBPB-Pb) under optimum conditions. Thermodynamic tests showed that As(V) and Pb(II) removal on MBPB was a spontaneous and endothermic physisorption process. MBPB showed great reusability in As(V) and Pb(II) removal, with removal rates as high as 71.4% and 66.5% after five cycles, respectively. Selective adsorption of As(V) and Pb(II) was also investigated on MBPB, and the removal rate was still high in the mixture of heavy metals. These findings provide a feasible method for the environmental-benign utilization of banana peel as a low-priced adsorbent in wastewater treatment .
研究领域:
环境科学
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废物管理
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材料科学
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化学工程
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DOI
高影响因子
WATER AIR AND SOIL POLLUTION
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2016
·Vol. 227
·期 4
·1-11
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IF 1.551
Ren Huixue,Jiang Jiahui,Wu Daoji,Gao Zhimin,Sun Youmin,Luo Congwei
Selective adsorption of Pb(II) and Cr(VI) by surfactant-modified and unmodified zeolites is discussed in this paper. The influences of pH, ionic strength, temperature, and adsorption time on Cr(VI) and Pb(II) adsorption are studied, The characteristics of the surface and inner structures of zeolites before and after modification are analyzed through infrared spectroscopy, scanning electron microscopy, X-ray diffraction, Brunauer–Emmett–Teller analysis, and zeta potential measurement. Results show that the characteristics of electric charge on the zeolite surface had changed after modification, which resulted in selective adsorption of Cr(VI) and Pb(II). Moreover, kinetic study reveals that adsorption by the different zeolites coincides with the Langmuir model and pseudo-second-order kinetic equation. The intraparticle diffusion equation proves that the Cr(VI) adsorption is mainly electrostatic, whereas Pb(II) adsorption proceeds via intrapore and electrostatic adsorption on the zeolite surface. This difference in mechanisms endows selectivity of metal ion adsorption by the modified zeolites. This study provides a reference on zeolite modification for use in various applications, such as wastewater treatment.
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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产品关联
DOI
高影响因子
Journal of Cleaner Production
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2024
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IF 9.7
Juehao Ai,Bowen Du,Xiaolong Gao,Jiachang Qiao,Shi Zhou,Xianqiang Yin,Yanji Jiang,Jun Wang,Yajie Zuo,Huimin Sun
The emergence of microplastics (MPs) and their coexistence with heavy metal contaminants pose potential risks to the safety of the subsurface environment and public health. Therefore, it is crucial to explore the co-transport of MPs (polypropylene (PP), polyethylene (PE), polystyrene (PS), polymethyl methacrylate (PMMA) and polytetrafluoroethylene (PTFE)) with the heavy metal Pb(II) under the surfactant (sodium dodecyl benzene sulfonate (SDBS) and cetyltrimethylammonium bromide (CTAB)). In this study, column experiments were performed to investigate the co-transport of MPs and Pb(II) under surfactants. The co-transport mechanism of MPs with Pb(II) under surfactant was revealed by MPs stability and batch adsorption experiments. Experimental results showed that the presence of Pb(II) did not influence the mobility of MPs under CTAB and SDBS; however, MPs can affect the mobility of Pb(II). Specifically, under CTAB, the MPs increased the recovery rate of Pb(II) from 86% to 87.55%–97.55%. However, under SDBS, the high mobility of PS, PE, and PP inhibited the transport of Pb(II), and the recoveries of Pb(II) decreased from 79% to 57.53%–70.96%. The low mobility of PTFE and PMMA slightly promoted the transport of Pb(II). This could be attributed to two reasons. One aspect is the adsorption rate of Pb(II) by MPs, which plays a pivotal role in influencing the transport tendency of Pb(II) with MPs. Another aspect is the MPs stability, as greater stability enhances their dispersity and accelerates the adsorption rate of Pb(II), thereby facilitating the co-transport of Pb(II) with MPs. This study could provide valuable insights for assessing the transport and environmental impact of MPs and heavy metals in the presence of surfactants.
研究领域:
环境科学
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污染生态学
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2024
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IF 20.2
Mengqing Hu,Di Zhao,Xinlong Yan,Yun Wang,Jin Zhang,Xiaoyan Hu,Ming Zhou,Porun Liu
Designing advanced bimetallic catalysts is essential to improving peroxymonosulfate (PMS) activation. Herein, a novel magnetic nickel/cobalt-layered double hydroxide decorated nitrogen-doped carbon (Ni/Co LDH@NC) catalyst we synthesized using carbonized ZIF-67 as a template for simultaneous removal of sulfamethoxazole (SMX) and Pb(Ⅱ) by PMS activation. The synthesized Ni/Co LDH@NC achieved complete degradation of SMX within 20 min and adsorbed Pb(Ⅱ) at 90.3 mg g −1 in 2 h. Notably, in simulated mixed wastewater, Ni/Co LDH@NC removed 100 % of SMX and simultaneously absorbed 84 % of Pb(Ⅱ) within 60 min. Density functional theory (DFT) studies revealed that synergistic Ni-Co sites and “bridging oxygen” vacancies enhanced electron transfer to PMS, facilitating O-O bond cleavage. The catalyst maintained high performance after four cycles, with over 85 % SMX degradation and 80 % Pb(Ⅱ) removal. This study highlights the potential of MOF-derived catalysts for efficient, simultaneous remediation of antibiotic and heavy metal pollutants, contributing to advanced wastewater treatment.
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
CHEMICAL ENGINEERING SCIENCE
·
2022
·
IF 4.889
Duanlian Tang,Zhuo Xiong,Ping Lu,Siqi Wang,Xiaoyan Chen,Xiaoyu Lou,Mingzhu Zheng,Song Chen,Changshen Ye,Jie Chen,Ting Qiu
Lacunary polyoxometalates (LPOMs), showing merits of designable coordination sites, may offer tremendous potential in toxic Pb(II) capture. However, their utilization is limited by their solubility in water and difficulty in reuse. Here, we report a self-assemble strategy to encapsulate LPOMs in customized cavities of ZIFs to afford reusable LPOM@ZIF adsorbents, with vacant oxygen sites tuned to afford efficient Pb(II) adsorption. It exhibited outstanding capture capacity of 764 mg g −1 , extraordinary affinity with K d of 2.87 × 10 7 mg L −1 , and ultrarapid efficiency with h of 412.5 mg g −1 min −1 that could enable ultradeep water purification from 71770 ppb to 1.84 ppb within 15 min. Density functional theory calculation and experiments validated the contribution of oxygen in LPOMs on this impressive Pb(II) adsorption followed μ 1 O > μ 2 O > μ 3 O, and NH on ZIFs was another site. Outcomes thus reveal LPOM@ZIF is an appealing platform for ultradeep Pb(II) removal that could address the most urgent global health challenges.
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
CHEMICAL ENGINEERING JOURNAL
·
2023
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IF 15.1
Zilun Hao,Daoyuan Nie,Meng Zhang,Weiwei Wang,Dong Zou,Guangze Nie
The engineering of macroscopic architectures by loading MoS 2 nanosheets onto larger framework materials is an efficient strategy to overcome the limitations preventing the application of nanosized MoS 2 -based adsorbents for Pb(II) removal. However, the large-scale utilization of these nanocomposites still faces several challenges as a result of their poor stability, slow adsorption kinetics, and low MoS 2 utilization. Herein, a practical and efficient nanocomposite (MoS 2 /PDA/MPS) was prepared by coating MoS 2 nanoflowers onto micron-sized polystyrene beads (MPS) via the construction of a strong adhesive polydopamine (PDA) interlayer. The PDA interface can adhere to the MPS surface and immobilize the MoS 2 nanopartices, thus facilitating the application of MoS 2 /PDA/MPS in flow-through systems. Further, the flower-like structure of the MoS 2 on the outer surface of the host exposes active sites and facilitates mass transfer compared to those of traditional nanocomposites. Meanwhile, the R-SO 3 - groups of MPS can enhance permeation and preconcentrate the Pb(II) ions via the Donnan membrane effect, resulting in improved adsorption kinetics and capacity. Batch adsorption experiments revealed that MoS 2 /PDA/MPS shows fast adsorption kinetics (<45 min), exceptional adsorption capacity (371.7 mg/g, calculated from the Langmuir model at 298 K), and high adsorption selectivity for Pb(II) uptake. The excellent stabilities and reusability of the nanocomposite were tested over 10 adsorption–desorption cycles. In addition, a considerable working capacity (approximately 2000 BV) in synthetic wastewater was observed in fixed-bed column tests, and the used adsorbent could be readily regenerated with a binary NaCl–EDTANa 2 solution for reuse without significant capacity loss. Thus, MoS 2 /PDA/MPS has great applications for the remediation of lead-containing wastewater, and our findings provide new insights into the preparation of efficient MoS 2 -based adsorbents having practical applications.
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
INORGANICA CHIMICA ACTA
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2018
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IF 2.264
Jun-Xia Xiao,De-Yun Ma
Two new 3D Zn(II)/Pb(II)-based MOFs, {[Zn 9 (mbpdc) 7 (3,3′-dmbpy) 2 ( μ 3 -OH) 4 ]·(H 2 O) 5 } n ( 1 ), and {[Pb 11 (mbpdc) 7 (μ 4 -O) 3 ( μ 3 -OH) 2 ]·(H 2 O)} n ( 2 ) ((H 2 mbpdc = 2-methyl-4,4′-biphenyldicarboxylic acid, 3,3′-dmbpy = 3,3′-dimethyl-4,4′-bipyridine) have been synthesized and were structurally characterized. Complex 1 exhibits 3D network with 10-connected ile topology and is comprised of pentanuclear (Zn 5 N 2 O 18 ) units bridged by mbpdc ligands and further pillared by 3,3′-dmbpy struts. Complex 2 is a new 3D lead(II) MOF constructed by dodecanuclear {Pb 12 (COO) 16 ( μ 3 -OH) 2 ( μ 4 -O) 4 } units and mbpdc ligands. Furthermore, the luminescence and the catalytic activities of 1 – 2 for the degradation of methyl orange in a Fenton-like process have also investigated.
研究领域:
材料化学
·
配位化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）