Applied Clay Science最新文献_第10页

Adsorption and oxidation of β-carotene by montmorillonite bleaching clays 蒙脱石漂白土对β-胡萝卜素的吸附和氧化作用

IF 5.3 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science

Pub Date : 2024-11-22 DOI: 10.1016/j.clay.2024.107638

Andrew J. Hambly, Jeroen S. van Duijneveldt, Paul J. Gates

The role that clay mineral acidity, specific surface area (SSA) and pore size distribution (PSD) have on the adsorption and oxidation of β-carotene by montmorillonite bleaching clays was investigated. Five commercially available clay minerals were studied, including three acid-activated montmorillonites (AACs) (K10, K30 and 22B), one aluminium-pillared montmorillonite (Al-PC) and an untreated montmorillonite (SWy-3). Each underwent physicochemical characterisation. X-ray diffraction and N₂ gas sorption techniques provided structural and textural information. Titration with n-butylamine in the presence of Hammett and arylmethanol indicators characterised the concentration and strength of clay acid sites. The kinetics of β-carotene adsorption were then measured as a means of comparing their adsorptive power. The tendency of each clay to oxidise β-carotene to a variety of carotenoid-oxidation-products (COPs) was examined by analysing extracts of each clay with ultra-high-performance liquid-chromatography mass-spectrometry (UPLC-MS). The AACs adsorption and oxidation of β-carotene exceeded that of SWy-3 and Al-PC. This was attributed to a greater number of stronger acid sites, and a higher SSA. The clay PSD was also shown to play a significant role. 22B, which had a narrower PSD than K10 or K30, showed a lower tendency to adsorb β-carotene despite having the greatest number of strong acid sites. Lastly, the AACs had a greater oxidative power than SWy-3 or Al-PC and produced COPs in greater abundance than the other clays. They also produced more COPs of a higher oxidation state relative to β-carotene. These findings provide helpful information for the selection of efficient adsorbents for use in vegetable oil bleaching.

研究了粘土矿物的酸度、比表面积（SSA）和孔径分布（PSD）对蒙脱石漂白粘土吸附和氧化β-胡萝卜素的作用。研究了五种市售粘土矿物，包括三种酸活化蒙脱石（AACs）（K10、K30 和 22B）、一种铝柱蒙脱石（Al-PC）和一种未经处理的蒙脱石（SWy-3）。每种蒙脱石都进行了物理化学表征。X 射线衍射和 N2 气体吸附技术提供了结构和质地信息。在 Hammett 和芳基甲醇指示剂存在的情况下用正丁胺滴定法表征了粘土酸性位点的浓度和强度。然后测量了 β-胡萝卜素的吸附动力学，以此来比较它们的吸附力。通过使用超高效液相色谱质谱法（UPLC-MS）分析每种粘土的提取物，研究了每种粘土将 β 胡萝卜素氧化成各种类胡萝卜素氧化产物（COPs）的趋势。AACs 对 β-胡萝卜素的吸附和氧化作用超过了 SWy-3 和 Al-PC。这归因于更多的强酸位点和更高的 SSA。粘土 PSD 也发挥了重要作用。与 K10 或 K30 相比，22B 的 PSD 更窄，尽管具有最多的强酸位点，但吸附 β 胡萝卜素的倾向性较低。最后，与 SWy-3 或 Al-PC 相比，AAC 的氧化能力更强，产生的 COPs 也比其他粘土更多。与 β-胡萝卜素相比，它们还能产生更多氧化态更高的 COPs。这些发现为选择用于植物油漂白的高效吸附剂提供了有用的信息。

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引用次数: 0

IF 5.3 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science

Pub Date : 2024-11-22 DOI: 10.1016/j.clay.2024.107643

Eduardo Ruiz-Hitzky

引用次数: 0

The influence of depositional conditions on chemical and mineralogical composition of glauconite: Case study from the Late Cretaceous Dokan Basin in Kurdistan region of Iraq 沉积条件对青金石化学和矿物成分的影响：伊拉克库尔德斯坦地区晚白垩世多坎盆地的案例研究

IF 5.3 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science

Pub Date : 2024-11-22 DOI: 10.1016/j.clay.2024.107639

Ibrahim Q. Mohammed , Tarang Sarin , Pragya Singh , Fadhil A. Lawa , Sherif Farouk , Khaled Al-Kahtany , Santanu Banerjee

Although glauconite is a common authigenic mineral in Late Cretaceous marine deposits, the influence of depositional conditions on the composition of glauconite is poorly understood. This study documents the origin and significance of five green clay layers in the Kurdistan region of Iraq in three formations, viz. Gulneri, Kometan, and Shiranish, comprised of carbonaceous mudstone, marl, marly limestone, dolomite, and limestone with occasional phosphates. Two sets of green clays within the ∼255 m thick, primarily transgressive marine sedimentary succession formed in distinct depositional domains, viz., inner shelf (proximal), and outer shelf to the middle slope (distal). Both sets of green clays formed primarily as pellets and as infillings. Characteristic reflections of ∼10 Å (001) and ∼ 3.35 Å (003), with high K₂O (>7 wt%) content and lamellar structure exhibited by green clays indicated evolved to highly evolved glauconite. The proximal set of green clay was identified as evolved to highly evolved Al-glauconite with low Fe₂O₃(total) (<15 wt%) and high Al₂O₃ (>10 wt%). The distal set of green clay was highly evolved, containing high (>15 wt%) Fe₂O₃(total) and low (<10 wt%) Al₂O₃. The proximal set exhibited minor (<10 %) smectite interstratification, whereas the distal set of glauconite was almost entirely devoid of smectite interstratification. The compositional variation of glauconite across the basin was primarily dictated by substrate and depositional setting; the proximal set of glauconite formed by replacing Al-rich smectite and kaolinite, while the distal set formed in Fe-Al smectite. The phosphates within the glauconites formed under suboxic conditions during the initial stages of glauconitization.

虽然绿泥石是晚白垩世海相沉积中常见的自生矿物，但人们对沉积条件对绿泥石成分的影响知之甚少。本研究记录了伊拉克库尔德斯坦地区三个地层（即 Gulneri、Kometan 和 Shiranish）中五种绿色粘土层的起源和重要性，这三个地层由含碳泥岩、泥灰岩、泥灰质灰岩、白云岩和偶尔含有磷酸盐的灰岩组成。在厚度为 255 米的绿色粘土层序中，有两组绿色粘土，主要形成于不同的沉积域，即内陆架（近端）和外陆架至中坡（远端）。两组绿色粘土主要以颗粒和填充物的形式形成。绿色粘土具有 ∼10 Å (001) 和 ∼ 3.35 Å (003) 的特征反射，K2O 含量高（7 wt%），呈片状结构，表明其为进化至高度进化的绿泥石。绿色粘土的近端组被确定为进化至高度进化的铝青绿石，其Fe2O3（总）含量低（15 wt%），Al2O3含量高（10 wt%）。远端绿色粘土呈高度演化状态，含有高（15 wt%）Fe2O3（总）和低（10 wt%）Al2O3。近端组呈现轻微（10%）的辉绿岩互层，而远端组的青粘土几乎完全没有辉绿岩互层。整个盆地中青云母的成分变化主要是由基质和沉积环境决定的；近端青云母是通过置换富含铝的闪长岩和高岭石形成的，而远端青云母则是在铁铝闪长岩中形成的。在玻璃钙钛矿化的初始阶段，玻璃钙钛矿中的磷酸盐是在亚氧条件下形成的。

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引用次数: 0

Acid-etched halloysite and Co-Ni-B composites for high-performance supercapacitor application 酸蚀埃洛石和 Co-Ni-B 复合材料在高性能超级电容器中的应用

IF 5.3 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science

Pub Date : 2024-11-20 DOI: 10.1016/j.clay.2024.107637

Fan Yang, Xue-Jing Ma, Jun-Hu Liu, Bi Chen, Kang Yang, Xin-Yu Liu, Wei-Bin Zhang

The rational design and optimization of electrode materials can effectively enhance the electrochemical performance of supercapacitors. In this work, by utilizing the microemulsion method to combine the nanoflake-structured Co-Ni-B material with the highly porous hollow tubular structure of acid-etched halloysite (eHal), the stable and porous Co-Ni-B@eHal composites have been successfully synthesized. Simultaneously, the bimetallic composition in Co-Ni-B can offer a wealth of redox reactions, while the eHal tubes provide support and facilitate the ionic transport channels. The optimal electrode exhibits a high specific capacitance of 1534 F g⁻¹ at a current density of 0.5 A g⁻¹ and maintains 99.67 % of its initial specific capacitance at a current density of 20 A g⁻¹, demonstrating excellent rate performance. Furthermore, it shows remarkable cyclic stability, retaining a specific capacitance of approximately 100 % after 60,000 cycles at a current density of 5 A g⁻¹. The assembled Co-Ni-B@eHal-based asymmetric supercapacitor operates at a working voltage of 1.5 V and achieves a maximum energy density of 105.73 W h kg⁻¹ at a power density of 375 W kg⁻¹. These findings offer new insights into the development of bimetallic boride-based nanostructures and clay minerals in the field of electrochemical energy storage.

合理设计和优化电极材料可有效提高超级电容器的电化学性能。本研究利用微乳液法将纳米片状结构的Co-Ni-B材料与酸蚀埃洛石（eHal）的高孔空心管状结构相结合，成功合成了稳定多孔的Co-Ni-B@eHal复合材料。同时，Co-Ni-B 中的双金属成分可提供丰富的氧化还原反应，而 eHal 管则可提供支持并促进离子传输通道。最佳电极在 0.5 A g-1 的电流密度下具有 1534 F g-1 的高比电容，在 20 A g-1 的电流密度下保持了 99.67 % 的初始比电容，表现出卓越的速率性能。此外，它还具有出色的循环稳定性，在 5 A g-1 的电流密度下循环 60,000 次后，比电容仍保持在约 100%。组装好的 Co-Ni-B@eHal 非对称超级电容器工作电压为 1.5 V，在功率密度为 375 W kg-1 的情况下，最大能量密度为 105.73 W h kg-1。这些发现为双金属硼基纳米结构和粘土矿物在电化学储能领域的发展提供了新的见解。

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引用次数: 0

Synthesis of phosphonitrile derivative-modified halloysite flame retardants and their simultaneous enhancement of epoxy resins flame retardancy and mechanical properties 膦腈衍生物改性哈洛石阻燃剂的合成及其对环氧树脂阻燃性和机械性能的同步改善

IF 5.3 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science

Pub Date : 2024-11-15 DOI: 10.1016/j.clay.2024.107629

Chunhui Meng , Yunhong Jiao , Weihong Wu , Quan Li , Yuying Yang , Hongqiang Qu

Design of flame retardant epoxy resins (EP) with good flame retardant and mechanical properties has been an important topic of research. In this paper, an amino-functionalized phosphonitrile intermediate (HCCP-APTES) was synthesized by nucleophilic substitution reaction between hexachlorocyclotriphosphonitrile (HCCP) and 3-aminopropyltriethoxysilane (APTES). Hal-based flame retardants (HCCP-APTES@Hal) with different ratios were prepared by chemically cross-linking them on the outer surface of halloysite (Hal). Hal and HCCP-APTES@Hal were added to EP to study their effects on the flame retardant and mechanical properties of EP. The flame retardant (3HCCP-APTES@Hal) when the mass ratio of HCCP-APTES: Hal was 3:1 was added to EP at 6 wt% and the LOI value was 27.20 %. And the cone calorimetry test (CCT) results showed that the peak heat release rate (PHRR) and peak smoke production rate (PSPR) decreased by 36.84 % and 52.08 %, respectively, compared with pure EP. HCCP-APTES-modified Hal well-improved the interfacial compatibility with EP, which led to the enhancement of mechanical properties. This study proposes new ideas and strategies for the modification of Hal and the preparation of multifunctional Hal-based flame retardants in the future.

设计具有良好阻燃性和机械性能的阻燃环氧树脂（EP）一直是一项重要的研究课题。本文通过六氯环三磷腈（HCCP）和 3-氨基丙基三乙氧基硅烷（APTES）之间的亲核取代反应，合成了氨基官能化磷腈中间体（HCCP-APTES）。通过化学交联的方法，在哈洛来石（Hal）的外表面制备出了不同比例的哈洛来石基阻燃剂（HCCP-APTES@Hal）。将 Hal 和 HCCP-APTES@Hal 添加到 EP 中，研究它们对 EP 阻燃性能和机械性能的影响。当 HCCP-APTES.Hal 的质量比为 3:1 时，将阻燃剂（3HCCP-APTES@Hal）添加到 EP 中：Hal 的质量比为 3:1 时，在 EP 中的添加量为 6 wt%，LOI 值为 27.20 %。锥形量热试验（CCT）结果表明，与纯 EP 相比，峰值放热率（PHRR）和峰值产烟率（PSPR）分别降低了 36.84 % 和 52.08 %。HCCP-APTES 改性 Hal 很好地改善了与 EP 的界面相容性，从而提高了机械性能。这项研究为今后改性 Hal 和制备多功能 Hal 基阻燃剂提出了新的思路和策略。

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引用次数: 0

Hysteresis at low humidity on vapor sorption isotherm of Ca-montmorillonite: The key role of interlayer cations 低湿度下钙蒙脱石蒸汽吸附等温线的滞后：层间阳离子的关键作用

IF 5.3 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science

Pub Date : 2024-11-14 DOI: 10.1016/j.clay.2024.107628

Yijie Wang , Zhen-Yu Yin , Pierre-Yves Hicher , Liming Hu

The vapor sorption isotherm (VSI) is significant for studying soil-water interactions. The non-coincidence between the adsorption isotherm and desorption isotherm is termed hysteresis. The VSI of expansive soils exhibits a unique hysteresis at low humidity, whose underlying microscopic mechanism has not yet been fully investigated. In this study, molecular simulations were used to generate the VSI of Ca-montmorillonite (Ca-Mt), successfully reproducing the hydration-induced swelling and dehydration-induced shrinkage in Mt. The specially designed simulation procedure ensured that the simulated hysteresis was consistent with experimental results at the humidity range of 0.1–0.5. We analyzed the variations in external and interlayer water content, as well as the basal spacing with humidity, highlighting the influence of interlayer hydration in the presence of the hysteresis. Through analyses of density, cation hydration state, and hydrogen bond, we found that the cations moved away from the mineral surface during adsorption, providing more space for water retention, and the formation of hydrogen bonds impeded the desorption of newly added water, leading to the hysteresis. Furthermore, we compared the VSI results of Mts with different interlayer cations (Ca²⁺ and Na⁺). Within the humidity range of the VSI test, the hydration shell of interlayer Ca²⁺ comprised 8 water molecules, whereas the hydration shell of interlayer Na⁺ comprised 4–6 water molecules. In the desorption isotherm simulation, water molecules in the hydration shell of Na⁺ could be displaced by the mineral surface at low humidity, unlike those of Ca²⁺, resulting in distinct hysteresis shapes in their VSI results at low humidity.

水汽吸附等温线（VSI）对研究土壤与水的相互作用具有重要意义。吸附等温线和解吸等温线之间的不重合称为滞后。膨胀性土壤的 VSI 在低湿度时表现出一种独特的滞后现象，其微观机理尚未得到充分研究。本研究利用分子模拟生成了钙蒙脱石（Ca-Mt）的 VSI，成功地再现了 Mt 的水化诱导膨胀和脱水诱导收缩。我们分析了外部和层间含水量以及基底间距随湿度的变化，突出了层间水合作用对滞后现象的影响。通过对密度、阳离子水合状态和氢键的分析，我们发现阳离子在吸附过程中远离了矿物表面，为水分的保留提供了更大的空间，而氢键的形成阻碍了新加入水分的解吸，从而导致了滞后现象的产生。此外，我们还比较了含有不同层间阳离子（Ca2+ 和 Na+）的 Mts 的 VSI 结果。在 VSI 测试的湿度范围内，层间 Ca2+ 的水合壳由 8 个水分子组成，而层间 Na+ 的水合壳由 4-6 个水分子组成。在解吸等温线模拟中，与 Ca2+ 不同，Na+ 水合壳中的水分子在低湿度时可被矿物表面置换，从而导致它们在低湿度时的 VSI 结果出现明显的滞后形状。

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引用次数: 0

Cronstedtite: H2 generation and new constraints on its formation conditions 克朗斯梯特：H2 生成及其形成条件的新制约因素

IF 5.3 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science

Pub Date : 2024-11-09 DOI: 10.1016/j.clay.2024.107627

Isabella Pignatelli , Enrico Mugnaioli , Régine Mosser-Ruck , Mustapha Abdelmoula , Jérôme Sterpenich

This work investigated the formation conditions of cronstedtite, the most Fe-rich serpentine, using a steel autoclave lined with Teflon at 90 °C, over 167 days, allowing for in situ monitoring of pH, T and P, as well as for gas sampling. From a starting mineralogical mixture composed of quartz and metal iron, cronstedtite crystallized in association with, magnetite, akaganeite, ferrihydrite and amorphous silica. This mineralogical association was not observed in previous syntheses and it is likely related to the experimental conditions of this study. These conditions also affected the composition and structure (polytypic sequence and crystallinity degree) of cronstedtite, which are accurately characterized for the first time. Experimental data and thermodynamic modelling indicate that this Fe-serpentine formed under neutral conditions, -62 < logfO₂ < −59, and redox potential ranging from −0.46 to −0.41 Volts. During the experiment, H₂ was generated by iron oxidation in presence of water, explaining the increase of pressure in the autoclave until 6.8 bar at 90 °C. The total amount of H₂ generated was of 0.23 mol. The results of this study are useful to improve the understanding of cronstedtite formation in natural and anthropic environments. They also showed that formation conditions of cronstedtite seem to be compatible with those needed for hydrogenotrophic life, as previously supposed by other works.

这项研究利用一个内衬特氟隆的钢制高压釜，在 90 ° C 的温度下，历时 167 天，研究了最富含铁的蛇纹石--川长石的形成条件，从而对 pH 值、T 值和 P 值以及气体采样进行了现场监测。在由石英和金属铁组成的初始矿物混合物中，铁石棉与磁铁矿、赤铁矿、铁水合物和无定形二氧化硅结晶在一起。这种矿物关联在以前的合成中没有观察到，可能与本研究的实验条件有关。这些条件还影响了芒硝的组成和结构（多晶序列和结晶度），并首次对其进行了精确表征。实验数据和热力学模型表明，这种铁蛇纹石是在-62 < logfO2 < -59的中性条件和-0.46至-0.41伏的氧化还原电位下形成的。在实验过程中，铁在水中氧化产生了 H2，这也是高压釜中的压力在 90 °C 时上升到 6.8 巴的原因。产生的 H2 总量为 0.23 摩尔。这项研究的结果有助于人们更好地了解自然和人为环境中铜闪石的形成。研究结果还表明，芒硝的形成条件似乎与之前其他研究推测的养氢生命所需的条件相符。

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引用次数: 0

Tea nanoparticles modified halloysite clay coated polyurethane sponge as multifunctional sensors 茶纳米粒子修饰的埃洛石粘土涂层聚氨酯海绵作为多功能传感器

IF 5.3 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science

Pub Date : 2024-11-08 DOI: 10.1016/j.clay.2024.107589

Kairui Tian, Xiangyu Chen, Xinyuan Zhou, Yuqian Xu, Mingxian Liu

Tea, as one of the three major beverages in the world, has antioxidant, anti-cancer, inhibitory inflammation, immune regulation, diabetes prevention, antibacterial and other effects. In this study, black tea and FeCl₃·6H₂O were chelated to functionally modify the outer surface of halloysite clay nanotube (Hal). A new nanomaterial with excellent photothermal properties, tea nanoparticles@Hal, was successfully synthesized. Tea nanoparticles@Hal powder can raise to 225.8 °C in 25 s, and the corresponding solution can raise to 50.5 °C in 8 min with a photothermal efficiency of 77.3 %. The tea nanoparticles@Hal was assembled on the polyurethane (PU) sponges by simply soaking to prepare conductive sensor. The flexible sensor shows a fast response time (132.8 ms) and a long service time (400 cycles), which have wide range of applications. The resistance changes with the pressure is in a regular functional relationship, and the sensor can measure the weight of objects with high accuracy. In addition, the sensor can stably monitor various physiological activities of the human body. When finger is bent, the sensor can produce the difference output signals. The prepared tea nanoparticles@Hal/PU sensor has broad prospects in fields such as human-computer interaction and medical detection.

茶作为世界三大饮料之一，具有抗氧化、抗癌、抑制炎症、免疫调节、预防糖尿病、抗菌等功效。在这项研究中，红茶和 FeCl3-6H2O 被螯合，对哈洛石粘土纳米管（Hal）的外表面进行了功能修饰。成功合成了一种具有优异光热性能的新型纳米材料--茶纳米颗粒@Hal。茶纳米颗粒@Hal粉末可在25秒内升温至225.8 °C，相应溶液可在8分钟内升温至50.5 °C，光热效率达77.3 %。通过简单的浸泡，茶纳米颗粒@Hal 被组装在聚氨酯（PU）海绵上，从而制备出导电传感器。这种柔性传感器响应时间快（132.8 毫秒），使用寿命长（400 次），应用范围广泛。该传感器的电阻随压力的变化呈规律的函数关系，可高精度地测量物体的重量。此外，该传感器还能稳定地监测人体的各种生理活动。当手指弯曲时，传感器能产生不同的输出信号。制备的茶纳米颗粒@Hal/PU 传感器在人机交互和医疗检测等领域具有广阔的应用前景。

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引用次数: 0

Multifunctional nanocomposites based on kaolinite/titania/iron applied to hydrogen peroxide production and bisphenol–A removal 基于高岭石/钛/铁的多功能纳米复合材料在过氧化氢生产和双酚 A 去除中的应用

IF 5.3 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science

Pub Date : 2024-11-06 DOI: 10.1016/j.clay.2024.107622

Marcus Vinicius do Prado , Vinicius Lima , Larissa Oliveira , Eduardo J. Nassar , Liziane Marçal , Emerson Henrique de Faria , Miguel Angel Vicente , Raquel Trujillano , Leticia Santamaría , Antonio Gil , Sophia Korili , Katia Jorge Ciuffi

The rising global demand for hydrogen peroxide, recognized for its eco–friendly properties, underscores the need for greener synthesis methods. Traditional production processes pose environmental risks, while direct synthesis faces challenges like water formation, explosion hazards, and stability issues, limiting industrial application. On the other hand, Bisphenol A (BPA), an endocrine disruptor widely used in plastics, presents significant environmental and health concerns due to its potential leaching into food and water. The present work introduces efficient and selective photocatalysts aimed at sustainable hydrogen peroxide synthesis and BPA degradation. Both processes were enhanced by the synergistic properties of Fe₂O₃–TiO₂ nanoparticles dispersed within a kaolinite matrix. The Fe₂O₃–TiO₂ photocatalysts, characterized by photoluminescence spectroscopy and X–ray diffraction, showed reduced emission upon iron incorporation and anatase presence on the kaolinite surface. The photocatalytic activity was evaluated through hydroxylation of terephthalic acid, revealing a 127 μmol/L min hydroxylation rate for the KaFeTi400 sample. BPA degradation studies indicated optimal performance in acidic conditions, achieving 96 % removal in 2 h and 98 % in 4 h, with the addition of H₂O₂ enhancing efficiency. Further, the photocatalyst facilitated benzyl alcohol oxidation to benzaldehyde, demonstrating a H₂O₂ production rate of 120 μmol. These findings highlight the multifunctional capabilities and environmental benefits of the photocatalyst, underscoring its potential for sustainable hydrogen peroxide synthesis and broader applications in environmental remediation. The catalysts address the pressing challenges associated with hydrogen peroxide synthesis and pollutant removal, particularly in the context of sustainability and environmental impact.

双氧水具有环保特性，全球对双氧水的需求不断增长，这凸显了对更环保合成方法的需求。传统的生产工艺存在环境风险，而直接合成则面临着水形成、爆炸危险和稳定性问题等挑战，从而限制了工业应用。另一方面，双酚 A（BPA）是一种广泛应用于塑料中的内分泌干扰物，由于可能会渗入食物和水中，因此引起了严重的环境和健康问题。本研究介绍了高效且具有选择性的光催化剂，旨在实现可持续的过氧化氢合成和双酚 A 降解。分散在高岭石基质中的 Fe2O3-TiO2 纳米粒子的协同特性增强了这两个过程。通过光致发光光谱和 X 射线衍射对 Fe2O3-TiO2 光催化剂进行了表征，结果表明，在高岭石表面掺入铁和锐钛矿后，发射率降低。通过对对苯二甲酸的羟基化来评估光催化活性，结果显示 KaFeTi400 样品的羟基化率为 127 μmol/L min。双酚 A 降解研究表明，该催化剂在酸性条件下具有最佳性能，2 小时内的去除率达到 96%，4 小时内达到 98%，加入 H2O2 可提高效率。此外，这种光催化剂还能促进苯甲醇氧化成苯甲醛，其 H2O2 生成率为 120 μmol。这些发现凸显了光催化剂的多功能性和环境效益，强调了它在可持续过氧化氢合成和更广泛的环境修复应用方面的潜力。这些催化剂解决了与过氧化氢合成和污染物去除相关的紧迫挑战，特别是在可持续发展和环境影响方面。

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引用次数: 0

Design and characterization of multicolor water-repellent coatings: Impact of alkyl chain length on surface properties 多色憎水涂层的设计与表征：烷基链长度对表面特性的影响

IF 5.3 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science

Pub Date : 2024-11-06 DOI: 10.1016/j.clay.2024.107626

Ceren Özcan Diker, Osman Duman, Sibel Tunç

Fabrication of functional colored water-repellent surfaces is very important for many industrial applications. Here, various colorful surface coating materials having water repellent property, chemical, thermal and UV light resistance and self-cleaning property were prepared using activated halloysite nanotube loaded with dye (A-Hal/dye), different alkoxysilanes (methyltriethoxysilane (MTES), octyltriethoxysilane (OTES) and hexadecyltrimethoxysilane (HDTMS)), and tetraethoxysilane and their coatings were performed on various substrates to determine the effect of alkyl chain length of alkoxysilane compound used in the coating formulation on the surface properties of colorful surfaces. Characterization studies of the synthesized surfaces or coated materials were performed using electron microscopy (TEM and SEM), SEM-mapping, FTIR, XRD, XPS and thermal gravimetic analysis techniques. Water contact angle (WCA) of glass surfaces coated with A-Hal/MB/MTES, A-Hal/MB/OTES and A-Hal/MB/HDTMS materials was found to be 148.0, 156.2 and 159.3°, respectively. The use of an alkoxysilane compound with long functional alkyl chain group in the coating formulation improved the water-repellent property of surface, while it slightly weakened the mechanical stability of the colorful surface. Polydimethylsiloxane (PDMS) coating, which were applied on colorful surfaces, improved the mechanical, thermal, chemical and environmental stability of coating, but decreased the water-repellent property of coated colorful surfaces. Fabricated coating materials having different colors were successfully used to coat various substrates such as glass, filter paper, wood, and cotton fabric. The results of this study show that A-Hal/dye/HDTMS coating materials prepared here are of a great potential in the fabrication of functional surface coatings.

制作功能性彩色憎水表面对许多工业应用都非常重要。在此，我们使用活性哈洛石纳米管负载染料（A-Hal/dye）、不同的烷氧基硅烷（甲基三乙氧基硅烷（MTES）、辛基三乙氧基硅烷（OTES）和十六烷基三甲氧基硅烷（HDTMS）），制备了各种具有憎水性能、耐化学腐蚀、耐热、耐紫外线和自清洁性能的彩色表面涂层材料、OTES）和十六烷基三甲氧基硅烷（HDTMS））以及四乙氧基硅烷，并将它们涂覆在各种基底上，以确定涂覆配方中使用的烷氧基硅烷化合物的烷基链长度对多彩表面的表面特性的影响。使用电子显微镜（TEM 和 SEM）、SEM 制图、傅里叶变换红外光谱、XRD、XPS 和热重力分析技术对合成表面或涂层材料进行了表征研究。发现涂有 A-Hal/MB/MTES、A-Hal/MB/OTES 和 A-Hal/MB/HDTMS 材料的玻璃表面的水接触角（WCA）分别为 148.0、156.2 和 159.3°。在涂层配方中使用具有长功能烷基链基团的烷氧基硅烷化合物提高了表面的憎水性，但略微削弱了着色表面的机械稳定性。在多彩表面涂上聚二甲基硅氧烷（PDMS）涂层后，涂层的机械稳定性、热稳定性、化学稳定性和环境稳定性都得到了改善，但涂覆多彩表面的憎水性却有所下降。制备的不同颜色的涂层材料被成功用于涂覆玻璃、滤纸、木材和棉织物等各种基材。研究结果表明，制备的 A-Hal/dye/HDTMS 涂层材料在功能性表面涂层的制备中具有很大的潜力。

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