JOURNAL OF APPLIED POLYMER SCIENCE
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2015
·Vol. 133
·期 11
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IF 1.768
Lian Tang,Yi Zheng,Shiyan Chen,Lei Wang,Huaping Wang
Flexible and nonpoisonous X-ray-shielding membranes supported by bacterial cellulose (BC) were prepared, in which X-ray-shielding materials were of microcapsule structure by using polyvinyl alcohol as shell and lead salt as core. The effect of the wall/core interaction and the amount of cross-linking agent were taken into consideration to find the optimal reaction conditions. The morphology, microcapsule size, and lead salt release properties were investigated. After supported by BC, the flexible and potable membranes for X-ray radiation protection were prepared and the shielding properties were evaluated, which indicated a good X-ray-shielding material. We set up a new method to prepare flexible and portable X-ray radiation protection membranes. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43120.
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CRYSTENGCOMM
·
2017
·Vol. 19
·期 21
·2860-2869
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IF 3.474
Xiaoli Yu,Qi Diao,Xiaokai Zhang,Yong-Ill Lee,Hong-Guo Liu
Hexagonal ultrathin nanoplates of basic lead carbonates were synthesized in aqueous lead acetate solution under ambient conditions. The sizes of the nanoplates were found to reach several hundreds of nanometers to micrometers, whereas the plate thickness was only several nanometers, corresponding to 3, 4, or 5 stacking layers along the c-axis. These nanoplates exhibited effective catalytic properties for the hydrogenation of nitroarenes, such as nitrobenzene, 4-nitroaniline, and 4-nitrophenol, and other organic dyes, such as methylene blue and methyl orange in aqueous solutions in the presence of KBH4. Pb nanoclusters were generated in situ during the catalytic process and were well dispersed on the surface of the nanoplates, leading to the formation of a zero-dimensional/two-dimensional (0D/2D) heterostructure. It was also found that the heterostructure exhibited different catalytic behaviors for the hydrogenation of the compounds mentioned above due to the different molecular structures and different adsorption and desorption abilities of the reactants and products. Such a heterostructure can be also anticipated to be an effective photocatalyst due to its strong UV-light absorption, the ultrathin characteristics of the highly crystalline nanoplates and the transfer abilities of the Pb nanoparticles.
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Journal of the Taiwan Institute of Chemical Engineers
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2016
·
IF 2.848
Ruiqi Fu,Yu Liu,Zimo Lou,Zhuoxing Wang,Shams Ali Baig,Xinhua Xu
A novel adsorbent (AC/Fe 3 O 4 @SiO 2 –NH 2 ) was synthesized via a co-condensation process for the enhanced removal of Pb(II) from aqueous solutions. Characterization analyses including SEM, TEM, BET and XRD confirmed the successful integration of magnetic nanoparticles and amino groups with carbon matrix. Results demonstrated that AC/Fe 3 O 4 @SiO 2 –NH 2 (mass ratio of AC to Fe 3 O 4 was 1:0.25) with specific surface area (48.9 m 2 /g) showed higher adsorption capacity for Pb(II) as compared to other mass ratios. Kinetics study revealed that the adsorption reach equilibrium within 20 h and the maximum adsorption capacity of 104.2 mg/g was achieved with increasing the initial concentration from 20 to 250 mg/L using AC/Fe 3 O 4 @SiO 2 –NH 2 . Maximum removal efficiency was recorded at pH 5.2 and the removal capacities toward four divalent metal ions calculated by the Langmuir model were found to be in the order of Pb(II) > Cu(II) > Ni(II) > Cd(II). Furthermore, Δ G 0 decreased from –1.6 to −3.1 kJ/mol with increase in temperature from 293 to 333 K illustrating that the adsorption was spontaneous and an endothermic process. Complexation adsorption mechanism was found prominent in FTIR and XPS analyses between Pb(II) and AC/Fe 3 O 4 @SiO 2 –NH 2 due to the presence of amino groups.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2017
·
IF 3.671
Nan Wang,Ru-Na Jin,A.M. Omer,Xiao-kun Ouyang
In the present study, a new adsorbent based on carboxylated cellulose nanocrystal (CCN) was developed for the adsorption of Pb(II) from fish sauce. The prepared adsorbent material was characterized by zeta potential, FT-IR, XRD, and XPS tools. The changes in the morphological structure of the developed CCN surface were evidenced by SEM and TEM. The favorable adsorption conditions were selected by studying the contact time, initial concentration, temperature, and concentration of the used glutamic acid and NaCl. The results indicated that the Langmuir isotherm model agrees very well with experimental adsorption data ( R 2 = 0.9962) with a maximum adsorption capacity 232.56 mg/g of Pb(II) at 293.2 K. Additionally, data of the adsorption kinetics follow the pseudo-second-order kinetics ( R 2 > 0.9990). On the other hand, the thermodynamics studies show that the adsorption process is spontaneous and endothermic. Furthermore, the developed CCN could be regenerated using acid treatment with a good reusability for Pb(II) adsorption. The results clearly indicated that the synthesized CCN could be effectively applied as a new material for Pb(II) adsorption from fish sauce solutions.
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Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 45
·18391-18400
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IF 5.7
Meidan Que,Shenghui He,Lili Gao,Boyue Zhang,Yabo Wang,Jin Chen,Bo Li,Wei Huang,Peng Zhong
The dynamic nature of formamidine lead iodide quantum dots (FAPbI3 QDs) limits their practical application by causing the appearance of ionic vacancy defects on the surface of QDs, which would then allow for significant trap-assisted non-radiative recombination of charge carriers. Herein, we explore a feasible surface modification strategy for passivating vacancy defects. Different lead salts are employed in the post-treatment procedure of quantum dot films. Based on both experimental and theoretical findings, Pb(NO3)2 passivation comprises Pb2+ and FA+. On the quantum dot surface, the O atoms from NO−3 form strong chemical bonds with FA+, and the O–C⋯O–N structure, defined by a dual-anchored configuration, contributes to the establishment of a stable crystal structure by exhibiting optimal bond lengths (3.486 Å and 3.775 Å, respectively) and a higher binding energy (10.51 eV). Finally, FAPbI3 quantum dot solar cells simultaneously achieve both exceptional environmental stability and a champion photoelectric conversion efficiency of 12.11%. This work provides valuable insights into surface chemical engineering of quantum dots, paving the way for high-performing photovoltaic devices.
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ACS Nano
·
2024
·
IF 15.8
Jixi Zeng,Jing Wang,Jinzhao Wang,Jia Li,Jiwen Chen,Feng Wei,Jing Zhang,Weijie Song,Xi Fan
Flexible tin–lead (Sn–Pb) mixed perovskite solar cells (PSCs) are among the promising flexible photovoltaics, owing to the narrow bandgap (NBG) of Sn–Pb perovskites, flexible and wearable features, and their role as a critical component in all-perovskite tandem photovoltaics. However, the flexible Sn–Pb PSCs suffer from a low power conversion efficiency, no higher than 18.5%, along with limited stability. Herein, we reported an efficient and stable flexible NBG Sn–Pb PSC via an N,N′-carbonyldiimidazole (CDI) passivation strategy. CDI, with strong adsorption energy, preferentially binds to Sn2+ compared with oxygen (O2), thus effectively inhibiting the adsorption of O2 on perovskite surfaces. The transfer of electron density around Sn2+ dramatically decreased, thus suppressing Sn2+ oxidation. The CDI treatments endowed the Sn–Pb mixed films with fewer defects, improved crystallinity, better morphology, and matched energy-level alignment. The flexible Sn–Pb devices exhibited a high PCE of 21.02%. Besides, the devices showed enhanced stability and promoted flexibility. This work provides a pathway to visibly increase the efficiency and stability of the flexible Sn–Pb mixed photovoltaic cells.
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JOURNAL OF POWER SOURCES
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2024
·
IF 8.1
Puqiang He,Yapeng He,Yi Yang,Hui Huang,Zhongcheng Guo
The sulfation and serious hydrogen evolution reaction render a substantial obstacle for the further development of lead-carbon batteries (LCBs). Herein, lead tartrate precursors derived from spent lead paste are pyrolyzed to in-situ synthesize a carbon encapsulated Pb/PbO nanoparticles , which are introduced as additives into the negative electrodes of LCBs. The in-situ formed carbon encapsulation Pb/PbO nanoparticles ensure the long-lasting inhibition of the hydrogen evolution reaction in the negative electrodes. The discharge capacity after the introduction of the composites is improved by 24 % compared with the control at 0.1C, and the cycle life is almost twice as long as the control. The remarkable hydrophilicity of the composites as 3D electro-osmotic pumps facilitates the absorption and transportation of electrolyte to the negative active materials. Additionally, the carbon encapsulated Pb/PbO nanoparticles could provide abundant nucleation sites for Pb/PbSO 4 conversion and reinforce the reversibility of the transformation between the substances. Benefiting the cooperative interaction between the multiple mechanisms in the composites, the sulfation and serious hydrogen evolution on the negative electrode are dramatically inhibited, consequently thus contributing to the admirable promotion of the overall performances of LCBs.
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JOURNAL OF HAZARDOUS MATERIALS
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2024
·
IF 12.2
Bokun Chang,Zixuan Huang,Xiaodong Yang,Tianhuan Yang,Xianhui Fang,Xianbao Zhong,Wei Ding,Gang Cao,Yajun Yang,Feinan Hu,Chenyang Xu,Ling Qiu,Jialong Lv,Wei Du
To investigate the adsorption effects of aged microplastics (MPs) on Pb(II) and their co-transport properties in homogeneous (quartz sand) and heterogeneous (quartz sand with apple branches biochar) porous media, we explored the co-transport of UV-irradiated aged MPs and coexisting Pb(II) along with their interaction mechanisms. The UV aging process increased the binding sites and electronegativity of the aged MPs' surface, enhancing its adsorption capacity for Pb(II). Aged MPs significantly improved Pb(II) transport through homogeneous media , while Pb(II) hindered the transport of aged MPs by reducing electrostatic repulsion between these particles and the quartz sand. When biochar, with its loose and porous structure, was used as a porous medium, it effectively inhibited the transport capacity of both contaminants. In addition, since the aged MPs cannot penetrate the column, a portion of Pb(II) adsorbed by the aged MPs will be co-deposited with the aged MPs, hindering Pb(II) transport to a greater extent. The transport experiments were simulated and interpreted using two-point kinetic modeling and the DLVO theory. The study results elucidate disparities in the capacity of MPs and aged MPs to transport Pb(II), underscoring the potential of biochar application as an effective strategy to impede the dispersion of composite environmental pollutants.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2025
·
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.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xinyu Liu,Taotao Ai,Yazhong Zheng,Xinyu Chen,Qin Li,Qian Qiu,Ying Zheng,Yuan Zhou,Haikui Song,Kun Yu,Chunlin Song,Haibo Zhang,Yan Yan,Gang Liu
The lead-free piezoelectric ceramics used in piezoelectric actuators have attracted extensive attention owing to their substantial electric-field-induced strain. In this study, The (1- x )Bi 0.5 (Na 0.41 K 0.09 )TiO 3 - x Sr(Hf 0.5 Sb 0.4 )O 3 (BNKT- x SHS) piezoelectric ceramics were synthesized using the conventional solid-state reaction method. The impact of SHS substitution on the microstructure and electrical properties was systematically explored. Among them, the BNKT-0.015SHS sample, featuring ergodic relaxor states, demonstrates a high piezoelectric strain coefficient ( d 33 *) of 785 p.m./V under a low electric field of 50 kV/cm(Strain = 0.392 %). It exhibits a repeatable strain value of 0.47 % under an 80 kV/cm electric field( d 33 * = 590 p.m./V). Moreover, the strain values remain around 0.4 % between room temperature and 100 °C, with variations within 90 %. The heightened repeatable strain response is considered to be linked to the electric field-induced reversible phase transition occurring within the ergodic relaxor state. The higher strain temperature stability is ascribed to the coexistence of quadrilateral polar nanoregions and rhombic polydomain nanoregions. This study provides an effective example for achieving significant strain responses, presenting a feasible candidate material for applications in piezoelectric actuators.
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Nature Photonics
·
2025
·
IF 32.9
Yang Xuke,Ma Tianjun,Hu Haojun,Ye Wenjiang,Li Xin,Li Mingyu,Zhang Afei,Ge Ciyu,Sun Xianglang,Zhu Yongxin,Yan Shuyu,Yan Jun,Zhou Ying,Li Zhong’an,Chen Chao,Song Haisheng,Tang Jiang
All-perovskite tandem solar cells are promising as next-generation high-efficiency photovoltaic devices. However, further progress in tin-lead (Sn–Pb) mixed perovskites, which are essential as the narrow-bandgap bottom sub-cell, is hampered by unbalanced crystallization processes, leading to inhomogeneous films and reduced power conversion efficiency (PCE). Here we provide a complete understanding of the formation of Sn–Pb films, from the precursor solution to the final film. We find that the total crystallization barrier for Sn-based perovskites is limited by the desorption of dimethyl sulfoxide (DMSO), while Pb-based perovskites experience a smaller DMSO desorption barrier. By engineering the reaction barrier in mixed films via tailoring the DMSO content, we obtain synchronous Sn–Pb perovskite crystallization and high-quality homogeneous films. On the basis of this understanding, we demonstrate single-junction Sn–Pb perovskite solar cells with a PCE of 22.88% and all-perovskite tandem devices with a certified PCE of 28.87%, fabricated by antisolvent-free methods. The unencapsulated tandem devices retain 87% of their initial PCE after about 450 h with maximum power point tracking under 1 sun illumination.
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ChemSusChem
·
2024
·
IF 7.5
Dong Li,Kaixuan Wang,Ying Chen,Renyi Li,Jiahong Tang,Yizhou Zhao,Wei Guo,Qi Chen,Yujing Li
Graphical A 0D/1D CPB@TCN heterojunction photocatalyst for CO 2 reduction is synthesized by immobilizing CsPbBr 3 (CPB) quantum dots on one-dimensional porous tubular g-C 3 N 4 (TCN). The strong Pb−N chemical bonding between CPB quantum dots and TCN provides a fast charge transfer channel for the CPB@TCN, which promotes the efficient separation and transfer of photogenerated carriers, resulting in excellent photocatalytic activity. Halide perovskite CsPbBr 3 (CPB) quantum dots (QDs) are considered as a promising candidate for solar-driven CO 2 conversion for their unique optoelectronic properties and suitable band structures. However, the CO 2 conversion efficiency of pristine CsPbBr 3 quantum dots is severely limited due to their rapid electron-hole pair recombination and insufficient active sites. In this study, by immobilizing CPB QDs onto one-dimensional (1D) porous tubular g-C 3 N 4 (TCN), an effective 0D/1D CPB@TCN heterojunction photocatalyst for CO 2 reduction is fabricated. Density functional theory (DFT) calculations combined with experimental studies demonstrate that CPB QDs are uniformly anchored on the surface of TCN through Pb−N chemical bonding, resulting in efficient separation and transfer of photogenerated carriers in CPB@TCN photocatalysts. The resultant CPB@TCN photocatalysts exhibit significantly enhanced photocatalytic activity for CO 2 reduction with the highest conversion rate of 22.62 μmol g −1 h −1 , which is 5.33-times higher than that of pristine CPB QDs. This work unveils the interfacial bonding mechanism of CPB@TCN heterojunction through Pb−N chemical bond, which provides new insights for the development perovskite-based heterojunction photocatalysts.
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