JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2017
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IF 3.012
Hai-Yan Song,Tian-Fang Kang,Meng-Fan Jiang,Jing-Jing Zhang,Shui-Yuan Cheng
A novel, simple, and versatile electrochemiluminescence (ECL) sensing platform for Pb(II) ions was developed based on DNAzyme with peroxidase-like activity to catalyze the reduction of hydrogen peroxide. Poly (diallyldimethylammonium chloride) (PDDA) with positive charge was adsorbed onto the surface of graphene oxide (GO) and then CdS quantum dots (QDs) with negative charge were enriched to the surface of GO by electrostatic interaction between CdS QDs and PDDA to prepare a composite (denoted as [email protected] ) which was immobilized on the surface of a glassy carbon electrode (GCE). When hydrogen peroxide was used as coreactant CdS QDs can produce ECL signal. G-rich DNA strand, i . e . T30695, can combine with Pb (II) ions to form a stable parallel G-quadruplex. The G-quadruplex can further combine with hemin to form DNAzyme which have catalysis towards the reduction of hydrogen peroxide causing the decrease of ECL signal. Amino-modified T30695 was attached to [email protected] composite by the reaction between the amino group of T30695 and carboxyl group of CdS QDs. The ECL signal of the biosensor was linearly dependent on the logarithm of Pb(II) concentration from 1.0 × 10 − 14 to 1.0 × 10 − 11 M with a detection limit of 9 fM. An excellent performance of ECL biosensor indicated that it is promising for Pb(II) detection in real samples.
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Journal of the Taiwan Institute of Chemical Engineers
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2017
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IF 4.217
Long Lv,Nan Chen,Chuanping Feng,Yu Gao,Miao Li
In this study, Xanthate-modified magnetic chitosan/poly (vinyl alcohol) particles (XMMCP) were synthesized by momentary gelation method and characterized to evaluate its properties. The results of FTIR and XRD analysis indicated that most of basic characteristic peaks were weakened in the spectrum of XMMCP compared with the spectrum of pure chitosan, PVA, and Fe 3 O 4 and the diffraction intensity decreased owing to a decline in crystallinity, respectively. The BET surface area, total pore volume and magnetization saturation value of XMMCP were 15.52 m 2 /g, 0.048 cm 3 /g and 34.8 emu/g, respectively, which ensured enough contact of material surface with the metal ions present for adsorption. Based on SEM images, rough and uneven surface of adsorbent was benefited to adsorption performance of Pb(II). Furthermore, the resulting adsorbent showed stability below 150 °C and good magnetic properties. The resulting material was stable in deionized water, acidic, and basic media in 10 days. Continuous adsorption–desorption cyclic results demonstrated that XMMCP could effectively adsorb Pb 2+ and Pb 2+ -loaded XMMCP could be effectively regenerated by HCl solution. Meanwhile, regenerated composite particles could be employed for repeated use without significant capacity loss. Therefore, XMMCP can be a promising material to treat water with Pb 2+ .
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ACTA MATERIALIA
·
2024
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IF 8.3
Kun Wei,Jianhong Duan,Gaosheng Li,Huifen Yu,He Qi,Hao Li
Multi-phase NaNbO 3 (NN) exhibits high adjustability on the ordering of both polarization and oxygen octahedral tilt, becoming a perfect carrier to design heterogeneous structure for boosting comprehensive energy storage properties. To balance the energy storage density and efficiency, the coexistence of the relaxor antiferroelectric (AFE) with high polarization capability and the relaxor ferroelectrics (RFE) with high efficiency is designed in this work by introducing Sr 0.7 Bi 0.2 □ 0.1 Ti 0.75 Ta 0.2 □ 0.05 O 3 (SBTT) into NaNbO 3 -BiFeO 3 . As a result, an outstanding capacitive energy density ( W rec ) of 12.25 J cm −3 with a high η of 83 % can be achieved in NN-BF-SBTT ceramic, which can be identified as a novel heterogeneous coexisting structure with the crossover of high polarization capability in relaxor AFE and high efficiency in RFE in terms of high-resolution TEM. Furthermore, grain refinement and the dense structure inhibit the leak current, suppress the concentration of oxygen vacancy defects and raise the activation energy ( E a ), thus enhancing the E B . These excellent energy storage properties overcome the trade-offs between the two sets of parameters ( W rec - η , Δ P - E B ), offering a refreshing strategy for the development of high-performance ceramic capacitors.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
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IF 8.1
Youyu Cao,Mengshuo Du,Fei Han,Xueli Luo,Weixia Yang,Wanmei Lin,Yingying Wang,Wenzhi Tang,Zhonghong Li
Pb(II) removal from water is essential for human health due to their high toxicity and carcinogenicity. Metal-organic frameworks (MOFs) have potential to remove heavy metal ions because of their adjustable structure and tunable pore size. However, the microporous structure limits their removal performance because Pb(II) mainly exists in water as hydrated ion, which is larger than the pore size of MOFs. Defect engineering is promising to form suitable pore to capture Pb(II). Herein, we developed an etched Cu 0.3 Zr 0.7 -MOF-808 MOF by a mixed-metal strategy followed with an etching process. We replaced part of Zr 4+ in the MOF-808 skeleton with Cu 2+ through competition between Zr 4+ /Cu 2+ for coordinating with –COOH on 1,3,5-Benzenetricarboxylic acid (H 3 BTC) to increase its specific surface area. Then H 3 PO 4 and EDTANa 2 ·2H 2 O as etchants were used to break the coordinate bond between Zr 4+ /Cu 2+ and –COOH on H 3 BTC to achieve macroporous structure to inhabit Pb(II). The powder property of MOFs limits their practical applications due to their poor recyclability. We crosslinked the MOF on CMC by coordinating Zr 4+ on the MOF with –COOH on CMC to form aerogel to facilitate its recyclability. The maximum adsorption capacity for Pb(II) was 542.77 mg/g at 45 °C. The adsorption of Pb(II) conformed to the intra-particle diffusion model and the Langmuir model, illustrating that the adsorption process was monolayer adsorption and affected by intra-particle diffusion. The electrostatic attraction and chelation between Pb(II) and –COOH accounted for the effective Pb(II) removal performance. This work provides a novel idea for the removal of heavy metal ions from water.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
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IF 7.7
Xiuxian Zhao,Heng Zhao,Anna Mei,Lin Peng,Junhua Sun
Green and high-performance biomass-based adsorbents have a good application prospect for the removal of heavy metals. At present, the preparation of chitosan/lignin biomass adsorbents mainly adopts dissolution-drying method, and the obtained adsorbents show relatively poor adsorption performance for heavy metals. To overcome this problem, a novel chitosan/lignin hydrogel (CSL) is prepared by a simple one-pot method through the Mannich reaction. Research findings show that the hydrogels present higher adsorption selectivity for Pb(II) and Cu(II) than other common heavy metals. Among them, the optimal hydrogel CSL1 shows unexpectedly ultrafast adsorption rate for Pb(II) and Cu(II) with equilibrium time of only 1 min and 2 min. Meanwhile, the maximum adsorption capacities of CSL1 for Pb(II) and Cu(II) are 139.86 and 98.71 mg·g −1 , respectively. Compared with the reported adsorption materials related to chitosan or lignin, the CSL1 has the advantages of simple preparation process, considerable adsorption capacity, and short adsorption equilibrium time. Moreover, the adsorption mechanism is investigated by Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS), and the results prove that the adsorption mechanism is chemical complexation. This work not only contributes to the advancement of hydrogel-based adsorbents, but also holds significant industrial potential for addressing water pollution issues and promoting sustainable development.
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高影响因子
DESALINATION
·
2024
·
IF 8.3
Kegui Zhang,Xin Liu,Lichao Tan,Keke Xu,Wenming Pei,Fukai Tang,Tong Wei,Jiqiang Jia,Bin Xu,Juying Li,Xinsheng Zhu,Feng Ge
In this work, an energy-efficient capacitive deionization (EACDI) system with energy-recovery and enhanced adsorption capacity was firstly built by using metallocene-doped MoS 2 /CNT (mFc@MoS 2 /CNT). The structures and morphologies of the porous materials including single walled carbon nanotube (SWCNT), MoS 2 /CNT and mFc@MoS 2 /CNT were investigated by transmission electron microscope (TEM), scanning electron microscope (SEM), X-ray diffractometer (XRD), Raman spectra and N 2 adsorption-desorption tests, and the performance of EACDI system on the removal of Pb 2+ and Cd 2+ were evaluated by electrosorption tests. The results suggest that this EACDI system shows higher adsorption capacity on the removal of heavy metal ions at the concentration level of mg/L, with respect to traditional capacitive deionization (CDI). Moreover, this new method shows good selectivity and high energy effectiveness on the separation of trace Pb 2+ with the adsorption efficiency of 96 % at 10 μg/L level and an energy consumption of 0.98 kJ/m 3 with 24.2 % energy recovery. As a result, this research reveals an advanced electrosorption method to purify the drinking water polluted by trace heavy metals with the advantage of low cost and high energy efficiency.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Xin Zhang,Jun Fan,Yue Sun,Yan Liu,Weisheng Zheng
With the rapid development of industrialization, heavy metal pollution has become a major challenge in aquatic environmental management. In this work, a novel gel-type ion exchanger based composite adsorbent (Zr-Fe-Y-001) was prepared with metal resources in zirconium material production wastewater for removal of Pb(Ⅱ) from aqueous solution. Zr-Fe-Y-001 contained sub-5 nm particles that were uniformly confined within the resin micropores, enhancing its Pb(Ⅱ) adsorption capacity substantially, which surpassed previously reported values. Batch experiments demonstrated that the adsorption capacity of Zr-Fe-Y-001 for Pb(Ⅱ) increased with rising pH within a range of 1–6. This capacity remained stable within the pH range of 1–6, and it maintained high selectivity even in the presence of competing ions, such as Ca(Ⅱ) and Mg(Ⅱ). The kinetic data were well described by the pseudo-first-order model, while the adsorption isotherms were dominated by the Langmuir model, yielding a maximum theoretical capacity of 842.07 mg/g at 313 K. The fixed-bed experiment demonstrated that Zr-Fe-Y-001 effectively reduced Pb(Ⅱ) concentration in wastewater to < 10 μg/L, as recommended by the World Health Organization for drinking water. Remarkably, the adsorbent retained over 90 % of its initial capacity after three regeneration cycles, confirming exceptional stability and recyclability. This study provides an effective and sustainable technical solution for the resource utilization of valuable metals in zirconium material production wastewater and the treatment of heavy metal pollution.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Yan Liu,Xiangju Mao,Wenshan Ni,Fang Xiao,Lei Fan,Kangkang Wang
Monolithic adsorbents have become promising materials for removing contaminants in wastewater. By combining the macrostructural advantage of monolithic materials with their excellent surface function, these materials offer significant potential for practical applications. This study proposes an efficient and economical preparation method for developing high-performance chitosan-based monolithic adsorbent for Pb 2+ removal. In brief, melamine foam (MF) was pre-modified with polydopamine (PDA), and chitosan (CS) was uniformly loaded onto the modified foam via a “crosslinking-surface deposition” process. The resulting monolithic adsorbent (CS/PDA@MF) exhibited a high adsorption capacity for Pb 2+ (174 mg g −1 ) and achieved equilibrium adsorption time (<120 min) in batch adsorption experiments. The material demonstrated excellent elastic properties, allowing for easy manual collection using tweezers. Six cycles of adsorption/desorption experiments proved satisfying reusability. Additionally, a fixed-bed column was prepared using CS/PDA@MF to investigate the continuous flow adsorption behavior, showing excellent potential for practical applications. The adsorption mechanism was explored by ATR FT-IR and XPS characterization. This study provides a technical foundation for research into high-performance CS-based monolithic adsorbents, which are expected to be promising candidates for environmental remediation.
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RSC Advances
·
2025
·Vol. 15
·期 17
·13728-13743
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IF 4.6
Xueling Liu,Wenjie Ren,Weilin Song,Wanqiang Zhang,Yuhan Wang,Yi Wang,Guozhi Fan,Lei Zhang,Yanjun Huang
Wastewater containing heavy metals and organic dye pollutants discharged into receiving waters poses a serious environmental concern. Herein, a novel EDTA-chitosan/alginate porous composite bead adsorbent (EC–AB) was reported for the simultaneous removal of lead (Pb(II)) and methyl blue (MB) complexes from wastewater. Characterization results showed that EC–AB contained plenty of oxygen/nitrogen functional groups. The effect of CaCO3 addition, pH of the initial solution, contact time, initial pollutant concentration, and ionic strength on EC–AB pollutant removal performance and the adsorption mechanism were systematically analyzed. These findings indicated that EC–AB exhibited high removal efficiency over a wide pH range and at high ionic strength. The maximum adsorption capacities of EC–AB for Pb(II) and MB were 504.11 mg g−1 and 660.76 mg g−1, respectively, at 298 K. Adsorption kinetics and isotherm studies indicated that the adsorption well fitted the pseudo-second-order kinetic model and the Langmuir isotherm. A possible adsorption mechanism involving electrostatic attraction, chelation, ion exchange, H-bonding and synergistic effects was proposed. Moreover, EC–AB showed superior stability and reusability, with removal efficiencies of 76.64% for Pb(II) and 80.29% for MB after five continuous adsorption–desorption cycles for treating complex wastewater. In summary, this work provides a beneficial strategy for designing high-performance adsorbents for the treatment of wastewater.
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Surfaces and Interfaces
·
2025
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IF 6.3
Chunjing Shi,Menghang Wang,Zhenyu Zhang,Hongxiu Zhou,Pengfei Hu,Longhua He,Xingzhong Liu,Huaxiang Cai,Zehong Pang
Ceramic dentures differ from those produced by additive manufacturing, and manual polishing is employed for ceramic dentures due to their hard-brittle nature, complex shapes, and thin-walled structures with thicknesses less than 1.0 mm. This presents challenges for the medical and manufacturing industries. To address these challenges, we prepared a novel ternary composite of Fe 3 O 4 @TiO 2 @PB (Prussian blue) to establish a photo-Fenton system. This composite enhances the transport of photogenerated electrons and facilitates the generation of radicals, demonstrating high photocatalytic activity for the polishing and degradation of pollutants without the need for sacrificial agents. Meanwhile, Fe 3 O 4 @TiO 2 @PB was utilized to develop a new photocatalytic magnetorheological polishing slurry. The slurry consisted of sorbitol, hydrogen peroxide, Fe 3 O 4 @TiO 2 @PB, and ceria (0.025 wt. %). After polishing, the surface roughness (Sa) decreased from 5.538 to 0.081 μm, representing a reduction of 98.54 % compared to the pristine surface. Due to photogenerated hydroxyl radicals, the Si-OH and Li-OH bonds can be created on the surface of the ceramic dentures, facilitating defects removal. Before and after polishing, the ceramic dentures enhanced the inhibition rates of Escherichia coli and Staphylococcus aureus from 50 % to 74 % and from 49 % to 80 % over the course of one day, respectively. Through irradiation with simulated sunlight, Fe 3 O 4 @TiO 2 @PB generates electrons, holes, and hydroxyl radicals, leading to the degradation of amoxicillin (AMOX) and polysorbate (PS20) by up to 99 % within 60 min. Additionally, Fe 3 O 4 @TiO 2 @PB was successfully separated and reused from the developed slurry. Therefore, the designed and developed novel ternary composite, Fe 3 O 4 @TiO 2 @PB, achieves photocatalysis, photodegradation, and recycling, offering new solutions for the medical, manufacturing, and environmental industries.
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SEMICONDUCTOR SCIENCE AND TECHNOLOGY
·
2025
·Vol. 40
·期 9
·095015
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IF 2.1
Xinyan Han,Xinjie Wang,Zhichao Zhang,Zhen Sun,Zhixin Jin
Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), an ordinary hole transport layer (HTL), has inherent shortcomings that restrict its use in Sn–Pb perovskite solar cells (PSCs). In this study, PEDOT:PSS was mixed with ethanol using a simple solution method, resulting in enhanced conductivity and an optimized work function. By varying the concentration of ethanol doping, the insulated PSS shell surrounding the PEDOT:PSS was stripped, and the conductivity of PEDOT:PSS was increased from 4.50 × 10−4 S cm−1 to 7.00 × 10−4 S cm−1. The work function was lowered by 0.23 eV to −5.30 eV, bringing it closer to the energy level of Sn–Pb perovskite. Ethanol-doped PEDOT:PSS was utilized as the HTL in Sn–Pb PSCs based on FA0.5MA0.5Sn0.5Pb0.5I3, resulting in 18.10% photoelectric conversion efficiency with negligible hysteresis, and more than 40% performance improvement compared to the undoped devices. Furthermore, the treatment of ethanol could enhance the stability of the devices. The doped device was placed in a glove box for one month, and its efficiency remained above 90% of the maximum value. Thus, ethanol doping in PEDOT:PSS should provide a promising strategy for developing HTLs in efficient Sn–Pb PSCs.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
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IF 6.361
Yuanli Liu,Jiang Xu,Zhen Cao,Ruiqi Fu,Chuchen Zhou,Zheni Wang,Xinhua Xu
This work aimed to develop a feasible technology to reuse dead pig biowaste for heavy metals removal , which was first carbonized into pig bone char (PBC) after pyrolysis and further functionalized with amino ( NH 2 ) to improve its affinity with heavy metals. The application of PBC after NH 2 -functionalization for aqueous heavy metals removal was explored, including Pb 2+ , Cu 2+ , and different complex Cu(II) species. PBC@SiO 2 -NH 2 showed comparable performance with AC@SiO 2 -NH 2 . The adsorption capacity of Pb 2+ and Cu 2+ by PBC@SiO 2 -NH 2 was 120 and 30 mg g −1 , respectively. The NH 2 functionalization enhanced the adsorption of complex Cu(II) species, and PBC@SiO 2 -NH 2 exhibited good performance under a wide pH range and coexisting ions. The adsorption of Cu(II) EDTA species with an EDTA/Cu(II) molar ratio of 1.0 by PBC would be enhanced ~3 times and ~6 times after NH 2 functionalization and further addition of Fe 3+ , respectively. The results of EDX , elemental mapping, and XPS confirmed the adsorption of Cu(II) species. The adsorption kinetics , isotherm, and thermodynamics of different Cu(II) species by PBC@SiO 2 -NH 2 were investigated. The regeneration of PBC@SiO 2 -NH 2 was easily performed via acidic wash. These results suggested the application potential of the reuse of biowaste, which could be a promising adsorbent for aqueous heavy metals after specific functionalization.
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