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Removal of cobalt and copper from aqueous solutions with sulfonated fruit waste 用磺化果渣从水溶液中去除钴和铜
Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-01-01 DOI: 10.3934/matersci.2023046
Salla Kälkäjä, Lenka Breugelmans, Johanna Kärkkäinen, Katja Lappalainen

In this study, orange peel waste was successfully sulfonated with SO3-pyridine complex in 1-allyl-3-methylimidazolium chloride ionic liquid in various reaction conditions. 1H NMR was used to verify the occurrence of the reaction and to select the most promising material for the adsorption experiments. The degree of substitution of the sulfonated orange peel waste used for cobalt and copper removal was found to be 0.82. It was prepared with the reaction temperature and time of 70 ℃ and 60 min respectively and with the SO3-pyridine complex to-peel waste ratio of 5:1. The selected material combined with ultrafiltration removed 98% of copper and 91% of cobalt from single metal solutions and 93% of copper and 83% of cobalt from binary metal solution at pH 5 with adsorbent dosage of 12.5 mg/100 mL and initial metal concentration of 8 mg/L. Preliminary experiments were also performed with apple pomace which was sulfonated in the conditions found best for the orange peel waste. The prepared sulfonated apple pomace proved to be almost as effective in cobalt and copper removal as sulfonated orange peel waste, removing 82% of copper and 77% of cobalt from binary metal solution with 12.5 mg/100 mL dosage at pH 5 and an initial metal concentration of 8 mg/L.

& lt; abstract>在本研究中,在不同的反应条件下,用SO<sub>3</sub>-吡啶配合物在1-烯丙基-3-甲基咪唑氯离子液体中成功地磺化了桔皮废料。采用核磁共振(hnmr)验证反应是否发生,并选择最有前途的材料进行吸附实验。用磺化橘皮废渣除钴、除铜的替代度为0.82。反应温度为70℃,反应时间为60 min, SO<sub>3</sub>-吡啶配合物与脱皮废物比为5:1。在pH为5,吸附剂用量为12.5 mg/100 mL,初始金属浓度为8 mg/L的条件下,所选材料结合超滤,对单金属溶液中铜和钴的去除率分别为98%和91%,对二元金属溶液中铜和钴的去除率分别为93%和83%。并对苹果渣进行了初步的磺化试验,确定了最佳磺化条件。制备的磺化苹果渣对钴和铜的去除率几乎与磺化橙皮渣相同,在pH为5、初始金属浓度为8 mg/L、用量为12.5 mg/100 mL的二元金属溶液中,铜和钴的去除率分别为82%和77%。& lt; / abstract>
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引用次数: 0
Surface modification of coatings based on Ni-Cr-Al by pulsed plasma treatment 脉冲等离子体处理Ni-Cr-Al基涂层的表面改性
Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-01-01 DOI: 10.3934/matersci.2023042
Didar Yeskermessov, Bauyrzhan Rakhadilov, Laila Zhurerova, Akbota Apsezhanova, Zarina Aringozhina, Matthew Booth, Yerkezhan Tabiyeva

To protect materials from abrasion-corrosion, various thermal spraying methods can be used to apply coatings, such as gas-flame powder spraying, plasma spraying, high velocity oxygen-fuel spraying and detonation cannon. Thermal spraying is one of the most effective methods of protecting the material from wear and corrosion, thereby increasing the service life of the material used. We present the surface modification of coatings based on Ni-Cr-Al by a pulsed plasma treatment using a plasma generator. The coatings were obtained by detonation spraying followed by pulsed plasma treatment. The changes to the structural properties of the coatings under the influence of plasma flow were studied using scanning electron microscopy, energy-dispersive X-ray spectroscopy and X-ray diffraction. The mechanical and tribological properties were analyzed by surface roughness characterization, microhardness testing and tribological tests for a comprehensive analysis of changes in the characteristics of the Ni-Cr-Al coatings following pulsed plasma treatment. It was found that modification of the coating by pulsed plasma treatment causes an increase in the microhardness of the surface layer, as well as a reduction in the surface roughness and friction coefficient. According to the results of X-ray phase analysis, these improvements in the mechanical and tribomechanical properties of the obtained surfaces is associated with an increase in the content of CrNi3, NiAl and NiCr phases in the coatings.

& lt; abstract>为保护材料不受磨损腐蚀,可采用各种热喷涂方法喷涂涂层,如气焰粉末喷涂、等离子喷涂、高速氧燃料喷涂和爆轰炮喷涂。热喷涂是保护材料免受磨损和腐蚀的最有效方法之一,从而增加了所用材料的使用寿命。利用等离子体发生器对Ni-Cr-Al基镀层进行了脉冲等离子体处理。采用爆轰喷涂和脉冲等离子体处理法制备涂层。利用扫描电子显微镜、x射线能谱和x射线衍射研究了等离子体流动对涂层结构性能的影响。通过表面粗糙度测试、显微硬度测试和摩擦学测试分析了Ni-Cr-Al涂层的机械性能和摩擦学性能,全面分析了脉冲等离子体处理后涂层特性的变化。结果表明,脉冲等离子体处理能提高涂层的显微硬度,降低表面粗糙度和摩擦系数。根据x射线相分析的结果,这些表面力学和摩擦力学性能的改善与涂层中CrNi<sub>3</sub>, NiAl和NiCr相含量的增加有关。& lt; / abstract>
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引用次数: 1
Cold-curing mixtures based on biopolymer lignin complex for casting production in single and small-series conditions 基于生物高聚物和木质素复合物的冷固化混合物,用于单件和小批量铸造生产
Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-01-01 DOI: 10.3934/matersci.2023047
Falah Mustafa Al-Saraireh
<abstract> <p>This study proves that lignin-based biopolymer materials can be employed as starting materials for the synthesis of novel casting binders that fulfill the current level of characteristics. The optimal concentration of the binder in the mixture was experimentally determined to be 5.8%–6.2%. It has been demonstrated in practice that the employment of ammonium salts as a technical lignosulfonate (TLS) modifier can result in the provision of cold (room temperature) curing of a mixture based on them. It was proposed to use as a technological additive that boosts the strength characteristics of a mixture of substances carboxymethyl cellulose (CMC). In a variety of adhesive materials, it is utilized as an active polymer base. The concentration limits for using CMC in the mixture are set at 0.15%–0.25%. To improve the moldability of the combination, it was suggested that kaolin clay be used as a plasticizing addition. The concentration limits for using a plasticizing additive are set at 3.5%–4.0%. The produced mixture was compared to the analog of the alpha-set method in a comparative analysis. It was discovered that the proposed composition is less expensive, more environmentally friendly, and enables the production of high-quality castings. In terms of physical, mechanical, and technological properties, the created composition of the cold curing mixture is not inferior to analogs from the alpha-set method. For the first time, a biopolymer-based binder system containing technical lignosulfonate with the addition of ammonium sulfate and carboxymethyl cellulose was used in the production of cast iron castings on the case of a cylinder casting weighing 18.3 kg from gray cast iron grade SCh20. Thus, it has been proved possible for the first time to replace phenol-based resin binders with products based on natural polymer combinations. For the first time, a cold-hardening mixture based on technological lignosulfonates has been developed without using hardeners made of very hazardous and cancer-causing hexavalent chromium compounds. But is achieved through a combination of specialized additives, including kaolin clay to ensure the mixture can be manufactured, ammonium sulfate to ensure the mixture cures, and carboxymethyl cellulose to enhance the strength properties of the binder composition. The study's importance stems from the substitution of biopolymer natural materials for costly and environmentally harmful binders based on phenolic resins. This development's execution serves as an illustration of how green technology can be used in the foundry sector. Reducing the amount of resin used in foundry manufacturing and substituting it with biopolymer binders based on technological lignosulfonates results in lower product costs as well as the preservation of the environment. Using lignin products judiciously can reduce environmental harm by using technical lignosulfonates, or compounds based on technical lignin. The combination is concentrated on
& lt; abstract>本研究证明木质素基生物高分子材料可以作为合成满足当前性能水平的新型铸造粘合剂的起始材料。实验确定了混合料中粘结剂的最佳浓度为5.8% ~ 6.2%。实践证明,使用铵盐作为技术木质素磺酸盐(TLS)改性剂可以提供基于它们的混合物的冷(室温)固化。提出将其作为提高羧甲基纤维素(CMC)混合物强度特性的工艺添加剂。在各种粘结材料中,它被用作活性聚合物基。CMC在混合料中的使用浓度限定为0.15% ~ 0.25%。为了提高复合材料的可塑性,建议添加高岭土作为塑化剂。塑化添加剂的使用浓度限定在3.5%-4.0%。在比较分析中,将生成的混合物与α集方法的类比进行了比较。人们发现,所提出的成分更便宜,更环保,能够生产高质量的铸件。在物理,机械和技术性能方面,所创建的冷固化混合物的组合物并不逊于α集方法的类似物。首次将含有技术木质素磺酸盐、添加硫酸铵和羧甲基纤维素的生物聚合物粘合剂系统用于生产重18.3 kg的灰铸铁铸件,铸件由SCh20级灰铸铁制成。因此,首次证明用基于天然聚合物组合的产品取代酚醛树脂粘合剂是可能的。第一次,一种基于技术木质素磺酸盐的冷硬化混合物已经开发出来,而不使用由非常危险和致癌的六价铬化合物制成的硬化剂。但它是通过特殊添加剂的组合来实现的,包括高岭土粘土,以确保混合物可以制造,硫酸铵,以确保混合物固化,以及羧甲基纤维素,以提高粘合剂组合物的强度特性。这项研究的重要性源于生物聚合物天然材料取代了基于酚醛树脂的昂贵且对环境有害的粘合剂。这一发展的执行作为绿色技术如何在铸造部门使用的一个例证。减少铸造制造中使用的树脂量,并用基于技术木质素磺酸盐的生物聚合物粘合剂代替,可以降低产品成本,并保护环境。明智地使用木质素产品可以通过使用技术木质素磺酸盐或基于技术木质素的化合物来减少对环境的危害。此次合并主要集中在单一和小规模生产企业,因为这可能只是调查的开始。该研究证实了在实际应用中创建基于技术木质素磺酸盐的冷硬化组合的可行性,并以生产的铸件为例,以灰口铸铁圆筒铸件的创建为例,支持了这一点。& lt; / abstract>
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引用次数: 0
Self-healing properties of augmented injectable hydrogels over time 增强型可注射水凝胶的自愈特性
IF 1.8 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-01-01 DOI: 10.3934/matersci.2023016
Connor Castro, Zachary R. Brown, E. Brewer
Injectable polymers offer great benefits compared to other types of implants; however, they tend to suffer from increased mechanical wear and may need a replacement implant to restore these mechanical properties. The purpose of this experiment is to investigate an injectable hydrogel's self-healing ability to augment itself to a previously molded implant. This was accomplished by performing a tensile strength test to examine potential diminishing mechanical properties with increasing time, as well as dye penetration tests to examine the formation of interfacial bonds between healed areas of hydrogels. There were several time points in between injections that were explored, from 0 min between injections all the way up to 48 h in between injections. The tests showed no statistical differences of the increased injection times compared to the single injection for the tensile test. However, our results showed an increase of mechanical breaks at self-healed joints, as well as a linear regression test showed a decrease in dye diffusion rate as time between injections increase. These results show that the hydrogel has strong self-healing abilities, and as time between injections increase, they mechanical properties will slowly decrease. Based on this, the tests can be applied to other injectable implants and a noninvasive solution to a worn-down implant, as well as show scientific backing to a possibly unique and beneficial self-healing property.
与其他类型的植入物相比,可注射聚合物提供了很大的好处;然而,他们往往会遭受更多的机械磨损,可能需要更换种植体来恢复这些机械性能。本实验的目的是研究一种可注射水凝胶的自我修复能力,以增强其对先前成型植入物的自我修复能力。这是通过进行拉伸强度测试来检查随着时间的增加机械性能的潜在下降,以及染料渗透测试来检查水凝胶愈合区域之间界面键的形成来完成的。在两次注射之间有几个时间点,从两次注射之间的0分钟一直到两次注射之间的48小时。试验显示,与拉伸试验的单次注射相比,增加的注射次数没有统计学差异。然而,我们的结果显示,自愈关节的机械断裂增加,线性回归测试显示,随着注射间隔时间的增加,染料扩散速率降低。结果表明,水凝胶具有较强的自愈能力,且随着注射间隔时间的增加,其力学性能会缓慢下降。基于此,该测试可应用于其他可注射植入物和磨损植入物的无创解决方案,并显示出可能独特且有益的自我修复特性的科学依据。
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引用次数: 0
Analysis of the folding behavior of a paperboard subjected to indentation of a deviated creasing rule using the finite element method 用有限元法分析了偏离压痕规则压痕作用下纸板的折叠行为
IF 1.8 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-01-01 DOI: 10.3934/matersci.2023017
Weerayut Jina, S. Nagasawa, Teruyuki Yamamoto, Takaomi Nagumo

This study reveals the crease deviation behavior through the developed forming simulation. A combination resistance model was expanded and applied to simulate the 180° folding process of a creased paperboard, using the shear-yield detaching resistance and the out-of-plane fluffing resistance which were based on the isotropic elastro-plastic model. When varying the misalignment of the creasing rule against the groove, the eccentricity of the crease bulging of a white-coated paperboard was compared through the experiment and simulation of the 180° folding process. Comparing the experimental deformation and the simulation, it was explained that the deviation of e contributed to making the crease deviation cd. At the folding test, the 180° folding was compared with the experiment and simulation. The rolling pass of the folded zone was considered to intensify the deviation state. The 180° folding simulation revealed that the crease deviation of cd ≈ 2e was assessed as an ideal condition when using the rolling pass and non-rolling pass. In the case of some shallow indentation in the experiment, 2e < cd < 4e was observed. The inside folded corners were quite different between the simulation and experiment, especially for a certain shallow indentation model. In the simulation, the local crushing was not performed under the assumption of any isotropic properties. In the simulation, the deviation of the creased position at the 180° folding was sufficiently predictable, when compared with experimental behavior.

本研究通过发达的成形模拟揭示了折痕偏差行为。利用基于各向同性弹塑性模型的剪切屈服分离阻力和面外起绒阻力,扩展并应用组合阻力模型对折痕纸板180°折叠过程进行了模拟。通过180°折痕过程的实验和仿真,比较了在改变折痕线与凹槽的对中偏差时,白布纸板折痕胀形的偏心率。对比实验变形和仿真,解释了e的偏差对折痕偏差cd的产生有贡献。在折叠试验中,将180°折叠与实验和仿真进行了比较。考虑了褶皱区的轧制孔道加剧了偏差状态。180°折叠仿真结果表明,采用轧制孔道和非轧制孔道时,折痕偏差cd≈2e为理想状态。实验中出现一些浅压痕时,2e < cd < 4e。内部折叠角的模拟结果与实验结果存在较大差异,特别是对于某一浅压痕模型。在模拟中,在假定各向同性的情况下,不进行局部破碎。在模拟中,与实验行为相比,在180°折叠时折痕位置的偏差是充分可预测的。
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引用次数: 0
Demonstration of ferroelectricity in PLD grown HfO2-ZrO2 nanolaminates PLD生长的HfO2-ZrO2纳米层合物的铁电性证明
IF 1.8 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-01-01 DOI: 10.3934/matersci.2023018
Sree Sourav Das, Zach Fox, Md Dalim Mia, B. C. Samuels, R. Saha, R. Droopad

Ferroelectricity is demonstrated for the first time in Si(100)/SiO2/TiN/HfO2-ZrO2/TiN stack using pulsed laser deposition (PLD) and the effects of temperatures, partial oxygen pressures, and thickness for the stabilization of the ferroelectric phase were mapped. Thin films deposited at a higher temperature and a higher oxygen partial pressure have a higher thickness, demonstrating a better ferroelectric response with ~12 μC/cm2 remnant polarization, a leakage current of 10−7 A (at 8 V) and endurance > 1011 cycles indicative of an orthorhombic crystal phase. In contrast, thin films deposited at lower temperatures and pressures does not exhibit ferroelectric behavior. These films can be attributed to having a dominant monoclinic phase, having lower grain size and increased leakage current. Finally, the effects of ZrO2 as top and bottom layer were also investigated which showed that ZrO2 as the top layer provided better mechanical confinement for stabilizing the orthorhombic phase instead of as the bottom layer.

利用脉冲激光沉积(PLD)技术首次在Si(100)/SiO2/TiN/HfO2-ZrO2/TiN叠层中证明了铁电性,并绘制了温度、氧分压和厚度对铁电相稳定的影响。在较高的温度和氧分压下沉积的薄膜具有较高的厚度,具有较好的铁电响应,残余极化为~12 μC/cm2,漏电流为10−7 a (8 V),续航时间为> 1011次,表明其为正交晶相。相反,在较低温度和压力下沉积的薄膜不表现出铁电行为。这些薄膜的主要特点是单斜相,晶粒尺寸较小,漏电流增大。最后,对ZrO2作为顶层和底层的影响进行了研究,结果表明ZrO2作为顶层比作为底层对稳定正交相提供了更好的机械约束。
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引用次数: 0
Modeling the flexural strength of steel fibre reinforced concrete 钢纤维混凝土的抗弯强度建模
IF 1.8 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-01-01 DOI: 10.3934/matersci.2023006
A. S. Karzad, M. Leblouba, Z. Al-Sadoon, M. Maalej, S. Altoubat
Industrial applications of fibre-reinforced concrete (FRC) in structures require extensive experimental and analytical investigations of the FRC material properties. For design purposes and applications involving the flexural loading of the member, it is essential to have a predictive model for the flexural strength of the FRC material. In the present paper, a fracture mechanics approach based on Bridged Crack Model (BCM) is used to predict the flexural strength of steel fibre-reinforced concrete (SFRC) beams. The model assumes a quadratic tension-softening relationship (σ-δ) governing the bridging action of the steel fibres and a linear profile of the propagating crack. The proposed tension-softening relationship is considered valid for a wide range of fibre-reinforced concrete materials based on the knowledge of either the material micromechanical parameters (such as fibre volume fraction, fibre/matrix bond strength, fibre length, and fibre tensile strength) or an actual experimentally-measured σ-δ relationship. The flexural strength model thus obtained allows the prediction of the flexural strength of SFRC and study the variation of the latter as a function of the micromechanical parameters. An experimental program involving the flexural testing of 13 SFRC prism series was carried out to verify the prediction of the proposed model. The SFRC mixes incorporated two types of steel fibres (straight-end and hooked-end), four different concrete compressive strengths (40, 50, 60, and 70 MPa), three different fibre volume fractions (1, 1.5, and 2%), and three specimen depths (100, 150, and 200 mm). The experimental results were compared to the predictions of the proposed flexural strength model, and a reasonable agreement between the two has been observed. The model provided a useful physical explanation for the observed variation of flexural strength as a function of the test variables investigated in this study.
纤维增强混凝土(FRC)在结构中的工业应用需要对纤维增强混凝土材料性能进行广泛的实验和分析研究。对于涉及构件弯曲载荷的设计目的和应用,有一个FRC材料抗弯强度的预测模型是必不可少的。本文采用基于桥梁裂缝模型(BCM)的断裂力学方法对钢纤维混凝土梁的抗弯强度进行了预测。模型假设钢纤维的桥接作用为二次型拉伸-软化关系(σ-δ),裂纹扩展呈线性分布。基于材料微力学参数(如纤维体积分数、纤维/基体粘结强度、纤维长度和纤维抗拉强度)或实际实验测量的σ-δ关系的知识,所提出的拉伸-软化关系被认为适用于广泛的纤维增强混凝土材料。由此得到的抗弯强度模型可以预测钢纤维混凝土的抗弯强度,并研究其随细观力学参数的变化规律。通过13个SFRC系列棱镜的弯曲试验,验证了该模型的预测结果。SFRC混合材料包括两种类型的钢纤维(直端和钩端),四种不同的混凝土抗压强度(40、50、60和70 MPa),三种不同的纤维体积分数(1%、1.5和2%),以及三种试件深度(100、150和200 mm)。将实验结果与所提出的抗弯强度模型的预测结果进行了比较,两者之间有较好的一致性。该模型为观察到的弯曲强度变化作为本研究中研究的测试变量的函数提供了有用的物理解释。
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引用次数: 0
Influence of chlorotrifluoroethylene on crystal structure and polymer dynamics of poly(vinylidenefluoride-co-chlorotrifluoroethylene) antibacterial copolymers 三氟氯乙烯对聚偏氟乙烯-共三氟氯乙烯抗菌共聚物晶体结构和聚合物动力学的影响
IF 1.8 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-01-01 DOI: 10.3934/matersci.2023009
Wisatre Kongcharoensuntorn, Pornpen Atorngitjawat
The effect of chlorotrifluoroethylene (CTFE) on dynamic relaxations of poly(vinylidenefluoride-co-chlorotrifluoroethylene) films (P(VDF-CTFE)) containing 0, 10, 15 and 20% of CTFE was investigated via broadband dielectric spectroscopy (DRS) and dynamic mechanical analysis (DMA). The interpretation was accompanied by the crystal structure obtained from Fourier transform infrared spectroscopy, wide-angle X-ray diffraction, small-angle X-ray scattering and differential scanning calorimetry. Increment of CTFE contents caused reducing the degree of crystallinity but did not impact the long period, lamellar thickness, and amorphous layer thickness. Four dynamic processes were clearly observed in DRS spectra for the neat poly(vinylidene fluoride) and P(VDF-CTFE) which were attributed to the local motion of amorphous chains (β), the segmental relaxation of amorphous chains (α1), the local conformational rearrangement of the TGTGʹ conformation (α2) and the process associated with Maxwell–Wagner–Sillars interfacial polarization (αMWS). The extra relaxation was observed for P(VDF-CTFE), which was more likely associated to the molecular motion of CTFE chain segments (αc), correspondent with DMA results. These PVDF and P(VDF-CTFE) conducted as self-antibacterial materials.
采用宽带介电光谱(DRS)和动态力学分析(DMA)研究了三氟氯乙烯(CTFE)对含0、10、15和20%的聚偏氟乙烯-共三氟氯乙烯(P(VDF-CTFE))薄膜动态弛豫的影响。通过傅里叶变换红外光谱、广角x射线衍射、小角x射线散射和差示扫描量热法获得晶体结构。CTFE含量的增加导致结晶度降低,但对长周期、片层厚度和非晶层厚度没有影响。纯聚偏氟乙烯(VDF-CTFE)和聚偏氟乙烯(VDF-CTFE)在DRS光谱中观察到四个动力学过程:非晶链的局部运动(β)、非晶链的节段弛豫(α1)、TGTG +构象的局部构象重排(α2)和与Maxwell-Wagner-Sillars界面极化(αMWS)相关的过程。P(VDF-CTFE)有额外的弛豫,这更可能与CTFE链段(αc)的分子运动有关,与DMA结果一致。这些PVDF和P(VDF-CTFE)作为自抗菌材料进行。
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引用次数: 0
Evonik P25 photoactivation in the visible range by surface grafting of modified porphyrins for p-nitrophenol elimination in water 赢创P25在可见光范围内通过修饰卟啉表面接枝去除水中对硝基酚
IF 1.8 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-01-01 DOI: 10.3934/matersci.2023024
J. Mahy, C. Carcel, M. W. Chi Man
An Evonik P25 TiO2 material is modified using a porphyrin containing Si-(OR)3 extremities to extend its absorption spectrum in the visible range. Two different loadings of porphyrin are grafted at the surface of P25. The results show that the crystallinity and the texture of the P25 are not modified with the porphyrin grafting and the presence of the latter is confirmed by Fourier-transform infrared spectroscopy (FTIR) measurements. All three samples are composed of anatase/rutile titania nanoparticles around 20 nm in size with a spherical shape. The absorption spectra of the porphyrin modified samples show visible absorption alongside the characteristic Soret and Q bands of porphyrin, despite slightly shifted peak values. The 29Si solid state nuclear magnetic resonance (NMR) spectra show that the porphyrin is linked with Ti–O–C and Ti–O–Si bonds with the Evonik P25, allowing for a direct electron transfer between the two materials. Finally, the photoactivity of the materials is assessed on the degradation of a model pollutant—p-nitrophenol (PNP)—in water. The degradation is substantially enhanced when the porphyrin is grafted at its surface, whereas a very low activity is evidenced for P25. Indeed, with the best sample, the activity increases from 9% to 38% under visible light illumination. This improvement is due to the activation of the porphyrin under visible light that produces electrons, which are then transferred to the TiO2 to generate radicals able to degrade organic pollutants. The observed degradation is confirmed to be a mineralization of the PNP. Recycling experiments show a constant PNP degradation after 5 cycles of photocatalysis of 24 h each.
赢创P25 TiO2材料使用含有Si-(OR)3末端的卟啉进行改性,以延长其在可见光范围内的吸收光谱。在P25表面接枝了两种不同负载的卟啉。结果表明,接枝卟啉并没有改变P25的结晶度和织构,并且通过傅里叶变换红外光谱(FTIR)测量证实了卟啉的存在。三种样品均由锐钛矿/金红石型二氧化钛纳米颗粒组成,尺寸约为20纳米,呈球形。卟啉改性样品的吸收光谱显示卟啉的特征Soret和Q带附近有可见的吸收,尽管峰值略有移位。29Si固态核磁共振(NMR)表明,卟啉与Ti-O-C和Ti-O-Si与赢创P25键合,允许两种材料之间的直接电子转移。最后,对材料的光活性进行了评估,以降解水中的一种模式污染物-对硝基酚(PNP)。当卟啉在其表面接枝时,降解能力大大增强,而P25的降解能力很低。事实上,最好的样品在可见光照射下,活性从9%增加到38%。这种改进是由于卟啉在可见光下被激活,产生电子,这些电子随后被转移到TiO2上,产生能够降解有机污染物的自由基。观察到的降解被证实是PNP的矿化。回收实验表明,经过5次24 h的光催化后,PNP降解稳定。
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引用次数: 1
Beam bending and Λ-fractional analysis 梁的弯曲和Λ-fractional分析
IF 1.8 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-01-01 DOI: 10.3934/matersci.2023034
K. A. Lazopoulos, A. Lazopoulos
Since the global stability criteria for Λ-fractional mechanics have been established, the Λ-fractional beam bending problem is discussed within that context. The co-existence of the phase phenomenon is revealed, allowing for elastic curves with non-smooth curvatures. The variational bending problem in the Λ-fractional space is considered. Global minimization of the total energy function of beam bending is necessarily applied. The variational Euler-Lagrange equation yields an equilibrium equation of the elastic curve, with the simultaneous possible corners being expressed by Weierstrass-Erdmann corner conditions.
由于建立了Λ-fractional力学的全局稳定准则,因此在此背景下讨论了Λ-fractional梁弯曲问题。揭示了相现象的共存,允许具有非光滑曲率的弹性曲线。研究了Λ-fractional空间中的变分弯曲问题。必须应用梁弯曲总能量函数的全局最小化。变分欧拉-拉格朗日方程得到弹性曲线的平衡方程,同时可能的角用Weierstrass-Erdmann角条件表示。
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AIMS Materials Science
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