SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Yu Ma,Dongyu You,Yu Fang,Jian Luo,Qinhe Pan,Yunling Liu,Fei Wang,Weiting Yang
The removal of lead ions from water is a global concern due to the great damage to human health when they enter the human body through drinking water. Herein, metal-organic framework/chitosan composite beads for the adsorption of Pb(II) were prepared by the secondary growth method, which allowed the domain-limited growth of TIF-A1 (a tetrahedral imidazolate framework) in the porous matrix of chitosan. This material can remove trace Pb(II) from aqueous solution (100 ppb) with an efficiency of 99.95%, and the remaining Pb(II) content meets the international drinking water standards. Moreover, it exhibited good recoverability for at least five adsorption/desorption cycles. The adsorption mechanism can be ascribed to that Pb(II) ions chelate with the hydroxyl, carboxyl and amino groups in the adsorbent. This work offers a good adsorbent for the removal of trace Pb(II), which has potential applications in reclaimed water treatment.
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高影响因子
RSC Advances
·
2017
·Vol. 7
·期 5
·2842-2850
·
IF 3.108
Zhang Yun-fei,Halidan Maimaiti,Zhang Bo
Nanocrystalline cellulose (NCC) with a particle size of 23.80 ± 0.33 nm was prepared from microcrystalline cellulose by a mixed treatment with acids and ultrasound. The NCC was chlorinated with thionyl chloride, submitted to dehydrating carbonization and oxidization, and then modified with ethylenediamine (EDA) to obtain fluorescent carbon nanoparticles (NCC–EDA). These were characterized by elemental analysis, TEM, BET, FT-IR, XRD, TG-DTA, XPS, UV-Vis, and photoluminescence. It was found that NCC–EDA were vesicle-like porous particles formed through the linking and intertwining effects of EDA on the SOCl2-treated NCC. The surface of NCC–EDA is rich in oxygen-, nitrogen- and sulfur-containing functional groups, and the particle size was 41.45 ± 0.55 nm. This endows the NCC–EDA with good dispersity in water, high absorbance and strong fluorescence. The NCC–EDA are shown to be viable probes in that their fluorescence is selectively quenching by Pb(II). The findings were exploited to design a fluorometric assay for Pb(II) that has a 24 nM detection limit.
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高影响因子
Journal of Cleaner Production
·
2021
·
IF 9.297
Yong Wei,Guijian Liu,Biao Fu,Ruwei Wang,Yuan Liu,Xuan Xue,Mei Sun
Inhalable fine particulate matter (PM), which is rich in Pb and other pollutants from coal-fired power plants, can cause air pollution and severe health problems. To facilitate the development of efficient techniques for controlling fine particulate Pb emissions, in this study, various types of size-resolved fine PM (<10.0 μm) were collected from the outlets of fabric filter units (FFs) at an industrial circulating fluidized bed (CFB) power plant to assess the distribution and partitioning behavior of Pb. The results showed that the mass particle size distribution (PSD) of the collected fine PM followed unimodal distribution, peaking at 5.8–4.7 μm, which might be caused by the fragmentation of limestone additives and new-formed CaSO 4 . However, the mass PSD of Pb for size-fractionated PM displayed different distribution pattern. Two peaks were observed in the size ranges of 5.8–4.7 μm and 1.1–0.7 μm. The mechanism of Pb enrichment in the supermicron particles was mainly controlled by the surface adsorption reaction, which could be explained by 1/d p dependence and be improved using excess active CaO produced by the injected limestone. For submicron particles, gas-film transfer or heterogenous condensation (mass transfer) might represent the deposition mechanism . Besides Pb enrichment, it was found that the submicron particles (<0.7 μm) mainly consisted of Si-rich and Si–Al phases. The emission of those fine SiO 2 -bearing particles should be limited as they can be inhaled and can damage the respiratory system.
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高影响因子
Materials Today Communications
·
2023
·
IF 3.8
Xiaoli Jin,Jiaheng Wang,Shuai Wang,Yulong Cao,Anchun Fang,Qingwei Wang,Jiaxu Gong,Yatang Dai
It is still an urgent task to design metal coatings for the development of corrosion resistance . Herein, Pb-Co-ZrO 2 coating is fabricated on the surface of aluminum plates via one-step pulsed electrodeposition for corrosion resistance. The pulse frequency, current density and duty cycle are 800 Hz, 15 mA cm −2 and 20 %, respectively. In this work, the concentration of ZrO 2 nanoparticles in the bath is the main operating variable. We further explored the deposition mechanism of the nanocomposite coating and demonstrated its application potential in corrosion resistance. As expected, the corrosion resistance and mechanical properties of the coatings increased and then decreased with the increase of the concentration of ZrO 2 nanoparticles in the plating solution. When the concentration of ZrO 2 nanoparticles in the plating solution was 15 g L −1 , the Pb-Co-ZrO 2 nanocomposite coating exhibited excellent corrosion resistance in 3.5 wt% NaCl solution, with an impedance modulus value (5182 Ω cm 2 ) that was eight times higher than that of the pure Pb coating (669 Ω cm 2 ), possessed the highest corrosion potential (- 0.60 V) and the lowest corrosion current density (3.6 μA cm −2 ), while also exhibiting excellent mechanical properties. The mechanism of the improved corrosion performance of the Pb-Co-ZrO 2 composite coatings was further explained using DFT calculations. The results show that the coupling between the interface of Pb-Co solid solution and ZrO 2 nanoparticles effectively improves the overall electron figure of merit of the coatings and triggers an obvious electron localisation, which increases the energy required for the interfacial electrons to escape from the coating interface.
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高影响因子
Polymers
·
2020
·Vol. 12
·期 2
·333
·
IF 3.426
Yifan Chen,Qian Li,Yujie Li,Qijun Zhang,Jingda Huang,Qiang Wu,Siqun Wang
In this work, cellulose nanocrystals (CNCs) obtained by the acid hydrolysis of waste bamboo powder were used to synthesize cellulose nanocrystal-g-poly(acrylic acid-co-acrylamide) (CNC-g-P(AA/AM)) aerogels via graft copolymerization followed by freeze-drying. The structure and morphology of the resulting aerogels were characterized by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM), and the CNC-g-P(AA/AM) aerogels exhibited excellent absorbent properties and adsorption capacities. Subsequent Pb(II) adsorption studies showed that the kinetic data followed the pseudo-second-order equation, while the adsorption isotherms were best described using the Langmuir model. The maximum Pb(II) adsorption capacity calculated by the Langmuir model reached up to 366.3 mg/g, which is a capacity that outperformed that of the pure CNC aerogel. The CNC-g-P (AA/AM) aerogels become structurally stable through chemical cross-linking, which enabled them to be easily regenerated in HCl solution and retain the adsorption capacity after repeated use. The aerogels were found to maintain 81.3% removal efficiency after five consecutive adsorption–desorption cycles. Therefore, this study demonstrated an effective method for the fabrication of an aerogel adsorbent with an excellent reusability in the effective removal of Pb(II) from aqueous solutions.Keywords:cellulose nanocrystal;graft copolymerization;aerogel;adsorption;lead
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PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2013
·
IF 3.925
Shao-Ping Kuang,Zhao-Zhan Wang,Jie Liu,Zhan-Chao Wu
In this paper, a novel triethylene-tetramine grafted magnetic chitosan was synthesized. The chemical structure and the percentage content of each element of chitosan and its derivatives were characterized by elemental analysis, infrared spectroscopy, solid state 13 C NMR, X-ray diffraction analysis and thermogravimetric analysis, respectively. Their surface topography was observed by the transmission electron microscope. The results of adsorption kinetics and adsorption thermodynamics showed the adsorption mechanism could be better described by the pseudo-second-order equation ( R > 0.999). The adsorption isotherm was well fitted by the Langmuir equation ( R > 0.999), and 0 < R L < 1. The maximum adsorption capacity was 370.63 mg/g at the optimized adsorption conditions, which were pH = 6, T = 298 K, t = 1.5 h, C 0 = 200 mg/L and adsorbent dose is 500 mg/L. The rate-limiting step may be the chemical adsorption rather than mass transport. The adsorbent still exhibited very good adsorption performance after the fifth regeneration cycle. The mechanism for adsorption and desorption was discussed.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 9
·8902-8913
·
IF 2.914
Sun Chen,Chen Tong,Huang Qunxing,Wang Jun,Lu Shengyong,Yan Jianhua
Novel KMnO 4 -treated magnetic biochar (FMBC) was successfully synthesized by addition of Fe(NO 3 ) 3 during carbonization and KMnO 4 treatment following for Pb(II) and Cd(II) adsorption. SEM-EDS, XPS, and ICP-AES were used to evaluate the FMBC and magnetic biochar (FBC) on surface morphology, surface chemistry characteristics, surface functional groups, and Pb(II) and Cd(II) adsorption behavior. Results showed that the Langmuir maximum adsorption quantity of FMBC reached 148 mg/g for Pb(II) and 79 mg/g for Cd(II), nearly 7 times of that of FBC. The enhancement of FMBC for heavy metal adsorption was due to the successful load of manganese oxides and the increased oxygen functional groups consistent with XPS and FTIR results. The adsorption capacities of FMBC were maintained over 95% when the pH value was higher than 2.5 and 3.5 for Pb(II) and Cd(II), respectively. The adsorption performances of both heavy metals by FMBC were hardly influenced by ionic strength and humid acid. The adsorption capacities of FMBC could maintain over 50% and 87% after four cycles for Pb(II) and Cd(II), respectively. The saturation magnetization of FMBC was about 11.5 emu/g, which did not change after adsorption. This work proposed a new method to fabricate a magnetic biochar with high adsorption capacities of heavy metals Pb(II) and Cd(II).
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高影响因子
CRYSTENGCOMM
·
2022
·Vol. 24
·期 14
·2567-2574
·
IF 3.756
Guobing Mao,Chunxiao Li,Zhengdao Li,Miao Xu,Heng Wu,Qi Liu
Herein, TiO2@Prussian-blue (PB) core–shell nanorod arrays for photoelectrochemical (PEC) applications were designed and prepared via a facile hydrothermal and electrodeposition process. Due to the combined merits of the anti-reflection structure of TiO2 nanorod arrays and broad light response of PB, the TiO2@PB film shows high light absorption efficiency. Additionally, the appropriate gradient energy gap of the core–shell heterostructure can promote photogenerated carrier separation and low electron–hole recombination rate. As a result, compared with TiO2 and PB films, the as-prepared TiO2@PB photoanode effectuates enhanced photocatalytic activity and the photocurrent density of TiO2@PB photoanode reaches 1.5 mA cm−2 at 1.23 V vs. RHE, which is approximately twice that of pristine TiO2 (0.75 mA cm−2). The introduction of the PB shell layer does not only improve light absorption ability but also enhances the photogenerated charge carrier's transfer and separation.
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高影响因子
Solar RRL
·
2022
·Vol. 6
·期 10
·2200398
·
IF 9.173
Lu Pan,Hui Li,Bohong Chang,Longwei Yin
Low bandgap tin–lead halide perovskite (PVSK) presents promising opportunities for high-performance solar cells. However, the randomly crystallized Sn–Pb PVSK with a tin-rich surface is easily oxidized, leading to high-level p-type doping, which hinders the performance enhancement of the solar cell devices. Herein, an efficient anti-solvent passivation strategy to regulate defect, crystallization, and energy conversion performance based on anti-solvents composed of chlorobenzene, isopropanol, and methylammonium chloride (MACl) is proposed. It is shown that the Sn–Pb PVSK film gets more moderate and order, with less PbI 2 and more α-phase PVSK formed. Furthermore, it is revealed that the surface of the as-processed film is Pb-rich, demonstrating a decrease in the surface p-type concentration, which is more suitable for the photoelectric conversion enhancement of the inverting device. Finally, the MACl-assisted post-treated Sn–Pb PVSK invert solar cells exhibit a high current density of 26.49 mA cm −2 with a open-circuit voltage of 0.70 V and a power conversion efficiency of 16.05%. The modified anti-solvent process fuses the advantage of additive and anti-solvent engineering for growing highly crystallized hybrid tin-lead halide PVSK for photovoltaic devices.
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2018
·
IF 3.235
Xueni Lin,Zhiwei Lu,Wanlin Dai,Baichen Liu,Yuxin Zhang,Junye Li,Jianshan Ye
Recently, graphene-based nanomaterials have attracted widespread attention as new electrode-modified materials for different electrochemical sensing platforms. However, graphene-based nanomaterials modified heavy metal sensors often have the disadvantages in that their detection ranges are not wide enough. To solve this problem, an easy and feasible approach derived from laser engraving technique to fabricate a high-quality 3D porous graphene-based heavy metal sensor with a quite wide detection range was established. The nitrogen-doped laser engraved graphene (N@LEG) was synthesized via introducing polyaniline (PANI) and polyvinylpyrrolidone (PVP) as N-dopant. Herein, by coupling the unique electrochemical properties and the 3D porous structure framework with large electrochemical active surface areas of LEG with the strong metal ions affinity of N atoms, N@LEG modified glassy carbon electrode (N@LEG/GCE) with in-situ bismuth film modification has been successfully utilized for the simultaneous determination of Cd(II) and Pb(II) using square wave anodic stripping voltammetry (SWASV). After optimizing conditions, the proposed sensor exhibits quite wide linear ranges varying from 5 to 10 g L −1 and 10 to 380 g L −1 for Cd(II), and 0.5 to 10 μg L −1 and 10 μg L −1 to 380 μg L −1 for Pb(II), respectively. In addition, the detection limits are calculated to be 1.08 g L −1 (S/N = 3) for Cd(II) and 0.16 g L −1 (S/N = 3) for Pb(II), which are nearly 3 times and 60 times less than the guideline values of the drinking water presented by the World Health Organization (WHO), for Cd(II) and Pb(II), respectively. Furthermore, the results describe satisfactory advantages of remarkable sensitivity, selectivity, anti-interference, repeatability, reproducibility and stability. Besides, the fabricated sensor is proved to be a potential perspective to detect Cd(II) and Pb(II) in actual water samples.
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高影响因子
MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Yiwen Lou,Wanqin Chen,Yating Gan,Ying Zhou,Haipeng Ye,Weiwei Huan,Yiming Zhang
A high-performance lateral flow and paper-based microfluidic device ( μ PAD) was constructed to develop a rapid read-out analytical platform for heavy metal elements (Pb (II)) in green tea with complex matrices. The entire analytical device was integrated with several functional parts, including a liquid flow channel and an enrichment visualization zone prepared by the molecularly imprinted polymer (MIP) protocol. Under the optimal conditions, the Pb (II) content in tea products can be sensitively and specifically analyzed using an in situ visualization readout. Herein, a rapid visual read-out analysis of the lead level can be achieved by overcoming the other co-existing interfering elements in the traditional green tea sample. The ionic imprinted paper chip can effectively capture the Pb (II) of the digested sample solution, and a visualization sensing process occurred between the metal elements and a chelating visual reagent with high sensitivity and selectivity in situ . Owing to the stable visualization performance, the constructed chip demonstrated good contrast, with a low background and easily recognizable colored spots. The linear range was 2.5–100 mg kg −1 , and the limit of detection for Pb (II) in traditional green tea was 1.375 mg kg −1 . In addition, other co-existing metal elements did not interfere with the analysis because of the appropriate pretreatment and selectivity of the paper-based chip. Furthermore, the analytical results for tea samples were verified by atomic absorption spectrophotometer (AAS) tests, which demonstrated the robustness and reliability of the proposed method. Therefore, the high-performance visualization lateral flow- μ PAD is a promising platform for the rapid analysis of metal element levels in food products.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2016
·
IF 4.836
Chunzhen Fan,Kan Li,Juexiu Li,Diwen Ying,Yalin Wang,Jinping Jia
In this paper, tetraethylenepentamine (TEPA) modified chitosan/CoFe 2 O 4 particles were prepared for comparative and competitive adsorption of Cu(II) and Pb(II) in single and bi-component aqueous solutions. The characteristics results of SEM, FTIR and XRD indicated that the adsorbent was successfully fabricated. The magnetic property results manifested that the particles with saturation magnetization value of 63.83 emu g −1 would have a fast magnetic response. The effects of experimental parameters including contact time, pH value, initial metal ions concentration and coexisting ions on single and bi-component adsorption were investigated. The results revealed that the adsorption kinetic was followed pseudo-second-order kinetic model, indicating that chemical adsorption was the rate-limiting step. Sorption isotherms were also determined in single and bi-component solutions with different mass ratio of Cu(II) to Pb(II) (Cu(II)/Pb(II)) and fitted using Langmuir and Freundlich isotherm models. A better fit for Cu(II) and Pb(II) adsorption were obtained with Langmuir model, with a maximum sorption capacity of 168.067 and 228.311 mg g −1 for Cu(II) and Pb(II) in single component solution, 139.860 and 160.256 mg g −1 in bi-component solution (Cu(II)/Pb(II) = 1:1), respectively. The present results suggest that TEPA modified chitosan/CoFe 2 O 4 particles are feasible and satisfactory adsorbent for efficient removal of Cu(II) and Pb(II) ions.
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高影响因子
危险品化学品经营许可证（带存储）