ACS Omega
·
2022
·
IF 4.132
Wenjing Fu,Cundi Wei,Jing Zuo,Jiupeng Zhang,Jinyi Zhang,Shaonan Xu
The Al sheets alloyed by Ga-In-Sn are generally utilized to react with water for H2 production, while the valuable byproducts, i.e., alumina hydrates, have not been fully studied. In this work, through controlling the reaction temperature, three types of alumina hydrates, bayerite (40 °C), pseudo-boehmite (PB) (70–120 °C), and boehmite (130–160 °C), were successfully prepared based on a series of interface reactions and structural transformations. These alumina hydrates and their calcined products (alumina) possess high purity with a total impurity element content of <450 ppm, especially an extremely low sodium content (<21 ppm) and iron content (<52 ppm). Significantly, the obtained pseudo-boehmite displays excellent surface properties (specific surface area: 332.7 m2 g–1, pore volume: 0.3 cm3 g–1, and pore diameter: 3.6 nm), competitive to the current commercial SB powder by Sasol. This work not only deepens the understanding of the byproducts in a Ga-In-Sn-alloyed Al–water reaction but also establishes a facile “green” method oriented to industrial applications, which is promising for the linkage benefits of the hydrogen production industry.
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高影响因子
Catalysis Science & Technology
·
2020
·Vol. 10
·期 24
·8437-8444
·
IF 5.721
Xiaomei Yang,Liuyong Wang,Tianliang Lu,Beibei Gao,Yunlai Su,Lipeng Zhou
Hydrothermally synthesized Sn-Beta is an excellent catalyst for the conversion of sugars to alkyl lactates. However, its catalytic performance is highly dependent on the synthesis parameters. In this work, the effects of the synthesis parameters such as the water amount of the synthesis gel and the crystallization time on the synthesis and properties and catalytic performance of Sn-Beta in the conversion of glucose to methyl lactate (MLA) were investigated. The crystallization rate was accelerated remarkably by reducing the water amount of the synthesis gel. With the aid of the Si-Beta seed, Sn-Beta was almost fully-crystallized after one day with nH2O/nSiO2 of 4.5, but seven days were needed with nH2O/nSiO2 of 7.5. However, Sn-Beta synthesized with nH2O/nSiO2 of 4.5 has more extraframework SnO2 due to the fast formation of the *BEA structure and the slow incorporation of Sn4+ into the framework sites, which resulted in the lower activity of MLA formation. More Sn4+ species were incorporated into the framework sites and thus more Lewis acid sites were generated with increasing crystallization time. At the same time, the ratio of open to closed Sn sites (RO/C) increased, which led to the decrease in the activity of MLA formation and due to that, the open Sn site with a proximal silanol is unfavorable for the conversion of glucose to MLA. During recycling study, it is surprisingly found that the yield of MLA increased gradually over the fully-crystallized Sn-Beta catalyst. Characterization results of the recovered catalyst from the eighth run indicate that the structure was preserved well, but the value of RO/C reduced due to the change of the state and microenvironment of Sn species.
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Energy Technology
·
2020
·Vol. 8
·期 6
·2000034
·
IF 3.404
Xiaoyan Wang,Ya-Jun Cheng,Qing Ji,Suzhe Liang,Liujia Ma,Zhuijun Xu,Xiuxia Zuo,Jian-Qiang Meng,Jin Zhu,Peter Müller-Buschbaum,Yonggao Xia
TiO 2 is a promising lithium-ion battery anode due to its good operation safety enabled by its voltage profile. However, the intrinsically low electronic/ionic conductivity and moderate reversible capacity compromise its potential for practical applications. It is proposed in this work to incorporate super-small sized metallic high capacity tin-based nanoparticles into TiO 2 /carbon nanohybrids, coupled with in situ generation of mesoporous structures. Difunctional methacrylate resin monomers are used as the solvent and carbon source, followed by carbonization and hydrofluoric (HF) etching treatment. The precursors of TiO 2 , tin-based component, and SiO x porogen agent are homogeneously integrated into the cross-linking network at a molecular level. High reversible capacities, excellent rate capability, and good capacity retention are achieved simultaneously due to synergistic effects from the tin-based component bearing high capacity and good electron conductivity, and mechanical buffer medium of the mesoporous structures. Reversible capacities of 452 mAh g −1 are achieved after 400 cycles at 200 mA g −1 . High rate capacity of 131 mAh g −1 is maintained at 5 A g −1 . The overall capacities are increased by more than 2 times compared with the capacities of the tin-free TiO 2 /C and pristine TiO 2 /SnO 2 /Sn/SiO x /C nanohybrids.
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Small
·
2024
·
IF 13
Tingting Zhu,Zuofang Yao,Jinghui Pan,Fengtao Hu,Shiming Zhang,Songyu Fan,Chenchen Xing,Zebin Yu,Shuangfei Wang,Yanping Hou
Surface defects on photocatalysts could promote carrier separation and generate unsaturated sites for chemisorption and reactant activation. Nevertheless, the inactivation of oxygen vacancies (OVs) would deteriorate catalytic activity and limit the durability of defective materials. Herein, bagasse-derived carbon quantum dots (CQDs) are loaded on the Sn-doped Bi 2 O 2 CO 3 (BOC) via hydrothermal procedure to create Bi─O─C chemical bonding at the interface, which not only provides efficient atomic-level interfacial electron channels for accelerating carriers transfer, but also enhances durability. The optimized Sn-BOC/CQDs-2 achieves the highest photocatalytic removal efficiencies for levofloxacin (LEV) (88.7%) and Cr (VI) (99.3%). The elimination efficiency for LEV and Cr (VI) from the Sn-BOC/CQDs-2 is maintained at 55.1% and 77.0% while the Sn-BOC is completely deactivated after four cycle tests. Furthermore, the key role of CQDs in stabilization of OVs is to replace OVs as the active center of H 2 O and O 2 adsorption and activation, thereby preventing reactant molecules from occupying OVs. Based on theoretical calculations of the Fukui index and intermediates identification, three possible degradation pathways of LEV are inferred. This work provides new insight into improving the stability of defective photocatalysts.
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LWT-FOOD SCIENCE AND TECHNOLOGY
·
2016
·
IF 2.711
Peng Hu,Xuebing Xu,Liangli Lucy Yu
This study obtained trans -free fats containing nervonic acid, a fatty acid with beneficial effects for mental health. Four fats containing 1.28–2.41% (w/w) nervonic acid were prepared by chemical or enzymatic interesterification of palm stearin (PS), Acer truncatum oil (ATO) and palm kernel oil (PKO). The chemical procedure was catalyzed using MeONa, whereas the enzymatic procedure was catalyzed with a 1,3–specific lipase. As a result, the interesterified fats showed a similar fatty acid profile to their corresponding physical blends measured by gas chromatography , but contained more nervonic acids at the sn -2 position, which was more conducive to metabolism and absorption. The content of tripalmitoylglycerol (PPP) and 1,3-dipalmitoyl-2-oleoyl glycerol (POP) or 1,2-dipalmitoyl-3-oleoyl glycerol (PPO) in the interesterified fats decreased significantly, resulting in improved plasticities. All interesterified fats showed a satisfactory content of tocopherols and oxidative stability. A combination of differential scanning calorimetry , X-ray diffraction spectroscopy and polarized light microscopy results suggested that the interesterified fats formed spherulitic needle-like crystals in the β′ form, while the physical blends formed dendritic crystals in the β form. These data indicated that the trans -free interesterified fats rich in nervonic acid may have a great potential in margarine applications.
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ACS Nano
·
2024
·
IF 15.8
Jie Qian,Yawen Li,Yifan Shen,Xiangqing Zhao,Chong Wu,Hao Gu,Zhipeng Zhang,Yanfeng Chen,Bo Cai,Junmin Xia,Wei Shen,Kun Cao,Lihui Liu,Lijun Zhang,Gang Cheng,Shufen Chen,Guichuan Xing,Wei Huang
The stability issue of Sn-based perovskite solar cells (PSCs) is expected to be resolved by involving a two-dimensional (2D) layered structure. However, Sn-based 2D PSCs, especially Dion–Jacobson (DJ)-phase ones with potentially good stability, have rarely been reported. Herein, superior DJ-phase Sn 2D perovskites with 3-aminobenzylamine (3ABA2+) or 4-aminobenzylamine (4ABA2+) π-conjugated short-chain ligands are reported to fabricate efficient 2D lead-free PSCs. Notably, the high dipole moment of the 3ABAI2 organic spacer is approved to possess faster charge transfer for forming (3ABA)FA4Sn5I16 2D perovskite with an extremely low exciton binding energy (only 84 meV). In combination with a diacetate partial substitution and methylamine iodide/bromide (MAI/MABr) post-treatment strategy to delay crystallization and improve compactness and coverage of the perovskite film, a record power conversion efficiency (PCE) of 6.81% and stability of 840 h (less than 5% degradation in a N2 atmosphere for unencapsulated devices) are acquired in eventual (3ABA)FA4Sn5I16 2D PSCs, which are among the highest PCE and the longest stability of Sn-based 2D PSCs reported to date. Our work provides a prospective molecule design and film preparation strategy of 2D Sn perovskites toward nontoxic high-performance tin-based PSCs, which pushes the almost stagnant research forward.
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RENEWABLE ENERGY
·
2024
·
IF 9
Hongjin Qu,Tianliang Lu,Xiaomei Yang,Lipeng Zhou
Tin-containing β zeolite exhibits excellent catalytic performance in various biomass conversions to high-value chemicals due to its strong Lewis (L) acidity produced by framework Sn 4+ sites. However, it is difficult to incorporate Sn species into the framework of β zeolite due to that the ionic radius of Sn (0.69 Å) is larger than that of Si (0.40 Å). Herein, organic additives with carbonyl, hydroxyl , aldehyde or amine groups were used to stabilize Sn species in the gel and framework Sn 4+ in the zeolite. Among all additives, acetone (AC) has the best stabilizing effect on Sn species. The stabilization effect between AC and Sn 4+ sites was observed by FT-IR. The characterization results indicate that more tin species were incorporated into β framework and the L acid density increased due to the complexation between carbonyl group and Sn species. Compared to Sn-β-3d synthesized without additive, the L acid density of Sn-β-AC-3d increased by ∼50% (from 21 μmol g −1 to 34 μmol g −1 ). For the conversion of ethyl levulinate to γ-valerolactone, the reaction reached equilibrium faster over Sn-β-AC-3d than over Sn-β-3d at the investigated reaction temperatures. A yield of 98% was obtained over Sn-β-AC-3d at 110 °C. Besides, Sn-β-AC-3d exhibited good stability and reusability.
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MICROCHEMICAL JOURNAL
·
2014
·
IF 3.583
Shengling Sun,Jie Li
A method has been developed for the determination of zirconium (Zr), hafnium (Hf), niobium (Nb), tantalum (Ta), molybdenum (Mo), tungsten (W), and tin (Sn) in seawater by quadrupole inductively coupled plasma-mass spectrometry (Q-ICP-MS). The method is based on separation of the seven elements by extraction chromatography using N-benzoyl-N-phenylhydroxylamine (BPHA) supported on a microporous acrylic ester polymeric resin. The optimized procedure indicates that the BPHA resin has high selective adsorption for Zr, Nb, Mo, Sn, Hf, Ta, and W (known as fluoride soluble elements), whereas other interference and matrix elements are minimally adsorbed. The optimized eluent mixture with their molarity gives satisfactory recoveries for all analytes. The recovery can be achieved 99% for Zr, 97% for Nb, 97% for Mo, 99% for Sn, 99% for Hf, 95% for Ta, and 98% for W, respectively, by eluting with 6 mL of 6 mol L − 1 HF/1 mol L − 1 HCl. Furthermore, the technique for separation and enrichment of these elements provides a low total method blank. The detection limits for this method are 0.5 ppt for Zr, 0.2 ppt for Nb, 1.7 ppt for Mo, 1.0 ppt for Sn, 0.1 ppt for Hf, 0.1 ppt for Ta, and 0.3 ppt for W, respectively. The validity of the method is evaluated by replicate analyses of seawater reference materials; the precision of the results is better than 3% (RSD, n = 4), and the results are in good agreement with certified values. The established procedure has proved to be both practical and effective for seawater sample analyses.
研究领域:
分析化学
·
海洋化学
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环境地球化学
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痕量元素检测
·
质谱分析
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Haixuan Liang,FeiFei Wang,ShuiQing Ji,Bihong Chen,Libo Yang,Xinpeng Wang
Precise separation and dynamic enrichment of Sn(IV) from complex strongly acidic waste liquids are important for strategic metal recovery, but remain challenging because high acidity and competing ions can severely weaken adsorption selectivity. Herein, a covalent phosphazene-based silica composite adsorbent, CPP-O/SiO 2 , was prepared through the in situ solvothermal polymerization of cyanuric acid and hexachlorocyclotriphosphazene on porous SiO 2 . The SiO 2 support preserved a regular spherical morphology and favorable column adaptability, while the CPP-O network supplied abundant N/O coordination sites. CPP-O/SiO 2 retained high Sn(IV) removal efficiencies above 95% in 0.5–1 M HNO 3 and achieved approximately 98% Sn(IV) removal in a simulated acidic multi-ion matrix mimicking waste printed circuit board (WPCB) leachate/high-level liquid waste (HLLW). Adsorption equilibrium was reached within 120 min, and the saturated adsorption capacity reached 188.41 mg/g at 318 K. Fixed-bed column experiments further demonstrated selective dynamic retention and enrichment of Sn(IV) from simulated HLLW, giving an enrichment factor of approximately 116 after elution with 0.1 M NaOH and maintaining stable performance over eight adsorption–desorption cycles. FT-IR, XPS, and DFT analyses revealed that Sn(IV) capture was mainly governed by synergistic coordination involving O and N sites, especially Sn O interactions. This work provides a robust covalent composite adsorbent for selective Sn(IV) recovery from strongly acidic multi-ion media.
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Solar RRL
·
2020
·Vol. 4
·期 7
·2000116
·
IF 7.527
Kaiqin Xu,Shangbo Ning,Huayu Chen,Shuxin Ouyang,Jianbo Wang,Lizhu Song,Jun Lv,Jinhua Ye
A plum pudding-like Sn-based electrocatalyst is synthesized by calcinating the precursor SnC 2 O 4 on carbon black (CB) with polymeric carbon nitride (CN). This material exhibits a structure of a Sn metallic ball coated with a nitrogen-doped SnO x native layer (N-doped SnO x @Sn) embedded on a carbon matrix. The carbon matrix originates from the CB and the polymeric CN decomposition promotes electrical conductivity, leading to high electrochemical activity of the CN–Sn catalyst. The introduction of nitrogen that occupies the interstitial space of the surface SnO x layer further enhances electron transport; furthermore, it provides an electron-rich environment for oxygen because of its lower electronegativity, which is the fundamental cause of selectivity in the electrochemical reduction of CO 2 to CO. The maximum CO Faradaic efficiency over the optimal catalyst reaches 57.5%, with a high CO partial current density of 6.09 mA cm −2 at −0.7 V versus reversible hydrogen electrode. This catalyst is further applied to construct a photovoltaic–electrocatalytic CO 2 reduction/oxygen evolution reaction device to stably convert CO 2 to chemicals over 6 h at a high solar-to-fuel efficiency of 11.3%. This work explores a strategy of rational modulation on surface electronic structure to obtain high-performance electrocatalysts, inspiring the selectivity tuning in electrochemical CO 2 reduction via electronegativity difference of various elements.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Shuang Liu,Limin Ma,Cheng Zhen,Dan Li,Yishu Wang,Qiang Jia,Fu Guo
Bismuth telluride-based thermoelectric generators (TEG) were widely used in the clean recovery of waste heat, but frequent failure problems at the hot-end electrode interface limited the reliable service of TEGs. Diffusion at the electrode interface between n-type Bi 2 Te 3 and Sn-based solder seriously damaged the performance of the TEGs. In this work, the crystalline Co-4 at.% P coating was deposited to protect the n-type thermoelectric material Bi 2 Te 3 . The microstructural characterization proved that the Co-P coating effectively resisted the diffusion of Sn, Bi, Te and Cu atoms, and prevented the generation of brittle intermetallic compounds (IMC) and cracks at the interface. Ultra-thin CoTe 2 layer was formed between Co-P and Bi 2 Te 3 , much thinner than the brittle Ni-Te layer reported in the literatures. It not only showed that a good metallurgical bond was formed between Co-P and Bi 2 Te 3 , but also implied the Co-P only consumed little thermoelectric elements. After the 150-hour aging test at 423 K, the shear strength of the electrode joints did not decrease, and the power generation sustainability of thermoelectric pillars was significantly improved compared with uncoated pillars. Overall, the crystalline Co-P coating would be an excellent candidate to protect the n-type Bi 2 Te 3 pillars of the TEGs.
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CHEMOSPHERE
·
2023
·
IF 8.8
Anqi Li,Xuening Bai,Yuting Xie,Pengyang Xia,Hebin Bao,Miao He,Xuzhong Zeng,Wenjing Yang,Xueming Li
To overcome the limitations imposed by Sn–Sb electrodes, the titanium foam (PMT)-TiO 2 -NTs@NiO–C/Sn–Sb composite electrodes with cubic crystal structure are synthesized by introducing NiO@C nanosheet arrays interlayer on the TiO 2 -NTs/PMT matrix through hydrothermal and carbonization process. Then a two-step pulsed electrodeposition method is used to prepare the Sn–Sb coating. Benefiting from the advantages of stacked 2D layer-sheet structure, the obtained electrodes exhibit enhanced stability and conductivity. Synergy of inner and outer layers fabricated by different pulse times strongly influence the electrochemical catalytic properties of the PMT-TiO 2 -NTs@NiO–C/Sn–Sb (Sn–Sb) electrode. Hence, the Sn–Sb (b0.5 h + w1 h) electrode is the optimal electrode to degrade the Crystalline Violet (CV). Next, the effect of the four experimental parameters (initial CV concentration, current density, pH value and supporting electrolyte concentration) on the degradation of CV by the electrode are investigated. The degradation of the CV is more sensitive to alkaline pH, and the rapid decolorization of CV when the pH is 10. Moreover, the possible electrocatalytic degradation pathway of CV is performed using HPLC-MS. Results from the tests show that the PMT-TiO 2 -NTs/NiO@C/Sn–Sb (b0.5 h + w1 h) electrode is an interesting alternative material in industrial wastewater applications.
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