Applied Clay Science最新文献_第10页

Palygorskite/iron nanoparticles composite for the removal of in(III) from aqueous solutions: Characterization, performance, and mechanism

IF 5.3 2区地球科学

Applied Clay Science Pub Date : 2024-12-27 DOI: 10.1016/j.clay.2024.107678

Pan Zhang, Lu Tang, ChunYan Lang

{"title":"Palygorskite/iron nanoparticles composite for the removal of in(III) from aqueous solutions: Characterization, performance, and mechanism","authors":"Pan Zhang, Lu Tang, ChunYan Lang","doi":"10.1016/j.clay.2024.107678","DOIUrl":"10.1016/j.clay.2024.107678","url":null,"abstract":"<div><div>Although indium and related derivatives are essential to the semiconductor communication sector, they are rather hazardous to the environment. A thermal-acid modified palygorskite supported nano-zero-valent iron composite (HA-PAL/nZVI) suitable for In(III) adsorption was prepared by a simple and rapid liquid-phase reduction method, and HA-PAL/nZVI was characterized by XRD, FT-IR, BET and SEM-EDS. The experimental results show that the saturated adsorption capacity of HA-PAL/nZVI for In(III) can reach 301.76 mg·g<sup>−1</sup> within 360 min under pH 3 and K 298.15. The adsorption process of In(III) conforms to the Langmuir isotherm model and the pseudo-second-order kinetic model, and ΔH = 10.04 kJ·mol<sup>−1</sup>, ΔS = 90.80 J·mol<sup>−1</sup>·K<sup>−1</sup>, ΔG < 0, which belongs to the rate-controlling step, spontaneous and endothermic chemical adsorption; In addition to Cu<sup>2+</sup> and PO<sub>4</sub><sup>3−</sup>, cations (Na<sup>+</sup>, K<sup>+</sup>, Ca<sup>2+</sup>, Mg<sup>2+</sup>, Sn<sup>4+</sup>, Pb<sup>2+</sup>, Zn<sup>2+</sup>, Cd<sup>2+</sup>), anions (Cl<sup>−</sup>, SO<sub>4</sub><sup>2−</sup>, NO<sub>3</sub><sup>−</sup>, CO<sub>3</sub><sup>−</sup>), organic molecules (H<sub>2</sub>C<sub>2</sub>O<sub>4</sub>) and ionic strength showed significant tolerance to the adsorption of In(III) by HA-PAL/nZVI. Combined with XPS analysis results, it was determined that the HA-PAL/nZVI adsorption mechanism of In(III) was mainly based on redox, co-precipitation and physical adsorption.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"265 ","pages":"Article 107678"},"PeriodicalIF":5.3,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143155231","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The beneficial effect of halloysite nanotubes as a matrix preventing the break of ordered mesoporous silica structure under microwave-assisted metal deposition

IF 5.3 2区地球科学

Applied Clay Science Pub Date : 2024-12-27 DOI: 10.1016/j.clay.2024.107686

Gleb Zasypalov , Anna Vutolkina , Aleksey Pimerzin , Vladimir Klimovsky , Egor Abramov , Aleksandr Glotov

{"title":"The beneficial effect of halloysite nanotubes as a matrix preventing the break of ordered mesoporous silica structure under microwave-assisted metal deposition","authors":"Gleb Zasypalov , Anna Vutolkina , Aleksey Pimerzin , Vladimir Klimovsky , Egor Abramov , Aleksandr Glotov","doi":"10.1016/j.clay.2024.107686","DOIUrl":"10.1016/j.clay.2024.107686","url":null,"abstract":"<div><div>The influence of microwave treatment on the structural characteristics of MCM-41 silica-based supports and properties of Ru-containing catalysts prepared thereon was investigated. The 800 W and 20 min mode of microwave treatment inevitably destroyed MCM-41 silica structure during the deposition of ruthenium particles. When moderate irradiation power to 400 W and duration time to 10 min, the destruction of the support was partially prevented, but the ruthenium loading reduces, simultaneously. To reinforce MCM-41 silica halloysite nanotubes (Hal) were introduced as a matrix for templated self-assembly of mesoporous silica, thereby forming ordered hierarchical MCM-41/Hal composite. The beneficial effect of Hal on the structural properties and stability of MCM-41 support under microwave-assisted Ru impregnation was demonstrated. MCM-41/Hal-supported catalysts revealed enhanced textural properties and characteristics of active component (high metal loading, narrow particle size distribution, high dispersion) compared to the analogous based on pure MCM-41. The catalytic properties were estimated in hydrogenation of multi-component aromatics-containing model feed, and Ru/MCM-41/Hal catalyst reveals 100 % benzene and ca. 89–90 % ethylbenzene and toluene conversion at the temperature range of 100–150°С for 3 h.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"265 ","pages":"Article 107686"},"PeriodicalIF":5.3,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143155826","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A novel protocol for detection and quantification of SARS-CoV-2 virus based on settlement rates of clay-virus-electrolyte mixture

IF 5.3 2区地球科学

Applied Clay Science Pub Date : 2024-12-25 DOI: 10.1016/j.clay.2024.107680

Himanshu Yadav , Deepa Mehta , Tadikonda Venkata Bharat , Sachin Kumar

{"title":"A novel protocol for detection and quantification of SARS-CoV-2 virus based on settlement rates of clay-virus-electrolyte mixture","authors":"Himanshu Yadav , Deepa Mehta , Tadikonda Venkata Bharat , Sachin Kumar","doi":"10.1016/j.clay.2024.107680","DOIUrl":"10.1016/j.clay.2024.107680","url":null,"abstract":"<div><div>Detection and quantification of a virus play a crucial role in diagnosis, determination of infection stage, and decision on treatment strategies. Further, it plays a crucial role in monitoring the disease propagation during the pandemic. A wide range of analytical methods are used to detect and quantify viruses. The currently available methods are, however, laborious, costly, and time-consuming. Also, the accuracy of many of these methods is debatable. We propose a novel method for the detection and quantification of coronavirus based on the clay–virus–electrolyte interaction using the sedimentation method. Newcastle disease virus (NDV), a Coronavirus surrogate (CS), and Infectious bronchitis virus (IBV), an avian coronavirus, were used in this study. Due to changes in inter-particle forces of clay in the presence of the virus, the sedimentation rate of the clay-electrolyte system changed. A protocol was thus developed based on the changes in the sedimentation rate to predict the presence and quantity of the given virus. The sedimentation rates were recorded by mixing the bentonite clay with the CS or IBV and 0.1 M NaCl electrolyte solution at a solid-to-liquid ratio of 1:50. The sedimentation rates were varied with different CS concentrations due to different particle-particle associations due to the sorption of virus particles on the clay surface. The proposed method was successfully validated for using the plaque assay techniques for CS virus and RT-PCR for the IBV. The proposed method is simple, cost-effective, and very useful for the detection of coronavirus and other viruses' presence and quantification. Moreover, the methodology is useful to diagnose the Newcastle disease virus (NDV), which causes infection among several avian species during avian outbreaks.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"265 ","pages":"Article 107680"},"PeriodicalIF":5.3,"publicationDate":"2024-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143155823","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Sonochemically improved regeneration of mechanically amorphized Ca2Cr-layered double hydroxides – Synthesis, characterization and photocatalytic lidocaine decomposition

IF 5.3 2区地球科学

Applied Clay Science Pub Date : 2024-12-24 DOI: 10.1016/j.clay.2024.107684

Vivien Szabó , Rebeka Mészáros , Bence Kutus , Gergely Ferenc Samu , Zoltán Kónya , Ákos Kukovecz , Pál Sipos , Márton Szabados

{"title":"Sonochemically improved regeneration of mechanically amorphized Ca2Cr-layered double hydroxides – Synthesis, characterization and photocatalytic lidocaine decomposition","authors":"Vivien Szabó , Rebeka Mészáros , Bence Kutus , Gergely Ferenc Samu , Zoltán Kónya , Ákos Kukovecz , Pál Sipos , Márton Szabados","doi":"10.1016/j.clay.2024.107684","DOIUrl":"10.1016/j.clay.2024.107684","url":null,"abstract":"<div><div>Our aim was to extend the structure recovery method previously seen for mechanochemically amorphized Ca<sub>2</sub>Fe-layered double hydroxides (LDH) to additional LDHs and to further improve it by utilizing ultrasonic irradiation. Work commenced with the synthesis of Ca<sub>2</sub>Cr-LDH, under the developed optimal conditions of unusually high alkali concentration (9 M NaOH) and mild heating (50 °C). Comparing ultrasonic treatment with mechanical mixing, sonication was able to recover the original structure twice as fast, reduce the direct optical band gaps of LDHs by larger extent, while the surface Cr<sup>VI</sup> content decreased by nearly 20 %. Without base addition, Ca<sub>2</sub>M-hydrocalumites (M<sup>III</sup>: Al, Sc, V, Cr, Fe, Ga, In) was used as sacrificial templates in lidocaine photomineralization by forming active M<sup>III</sup> hydroxides and oxide particles. LDH-derived Cr(OH)<sub>3</sub> proved to be a robust and reusable catalyst, with efficiencies ahead of many semiconductors such as SnO<sub>2</sub>, BiOBr, WO<sub>3</sub>, SrTiO<sub>3</sub> and ZnO. At pH 12, dissolution of Ca<sub>2</sub>Cr-LDHs was inhibited, so that the catalytic effects of pre-milling and structural restoration could be studied. Performance of Ca<sub>2</sub>Cr-LDHs nearly doubled after grinding, while a small increase was observed for Mg<sub>2</sub>Cr- and a decrease for Zn<sub>2</sub>Cr-LDHs. However, with appropriate structural recovery, activity of all LDHs was enhanced compared to the initial or ground solids. Benefits of ultrasonic recovery in catalysis over mechanical stirring have also been demonstrated and highlighted key aspects of the efficiency of structure recovery in the significantly different hydrocalumite−hydrotalcite systems.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"265 ","pages":"Article 107684"},"PeriodicalIF":5.3,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143155827","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Phosphorus removal by concrete-based layered double hydroxides: The influence of titration mode for continuous flow coprecipitation

IF 5.3 2区地球科学

Applied Clay Science Pub Date : 2024-12-24 DOI: 10.1016/j.clay.2024.107682

Xiao Liu, Yaze Zhi, Yue Yuan, Huiyuan Zhong, Yanhua Chen, Guoyuan Shi, Mei Yang

{"title":"Phosphorus removal by concrete-based layered double hydroxides: The influence of titration mode for continuous flow coprecipitation","authors":"Xiao Liu, Yaze Zhi, Yue Yuan, Huiyuan Zhong, Yanhua Chen, Guoyuan Shi, Mei Yang","doi":"10.1016/j.clay.2024.107682","DOIUrl":"10.1016/j.clay.2024.107682","url":null,"abstract":"<div><div>The global phosphorus (P) crisis and eutrophication promotes the development of dephosphorization technology from wastewater. To seek an effective and sustainable way for phosphorus removal, concrete-based layered double hydroxides (C-LDH) was synthesized from waste concrete by continuous flow coprecipitation method. Results indicated that the dropping mode of the titration had significant effects on the property of C-LDH. The product of single-point titration coprecipitation (C-LDH<sub>S</sub>) presented developing flakes morphology, which contained more Ca/Al-LDH and a certain amount of Mg/Al-LDH, while the product of multipoint titration coprecipitation (C-LDH<sub>M</sub>) exhibited a good hexagonal morphology and contained more Mg/Al-LDH. C-LDH<sub>M</sub> provided more valid adsorption sites and higher adsorption energy for phosphorus, resulting in a larger adsorption capacity. Ca/Al-LDH in C-LDH tended to dissolve when the environmental pH value was lower than its formed pH, but Mg/Al-LDH remained, the difference between the two components brought about different P-uptake efficiency and mechanism between C-LDH<sub>S</sub> and C-LDH<sub>M</sub>. The dissolution of Ca/Al-LDH from C-LDH<sub>S</sub> initiated the dephosphorization way dominated by Ca<img>P precipitation, whereas the more reservation of Mg/Al-LDH in C-LDH<sub>M</sub> derived more P-uptake by adsorption. The phosphorus held by C-LDH<sub>M</sub> presented better recyclability. The overall results indicated that C-LDH<sub>M</sub> was an economical and sustainable candidate for phosphorus removal.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"265 ","pages":"Article 107682"},"PeriodicalIF":5.3,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143155825","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of MgO-based cementitious binder on smectites

IF 5.3 2区地球科学

Applied Clay Science Pub Date : 2024-12-20 DOI: 10.1016/j.clay.2024.107677

Wolfgang Jan Zucha , Ellina Bernard , Raphael Kuhn , Michael Plötze , Alexander Puzrin

{"title":"Effects of MgO-based cementitious binder on smectites","authors":"Wolfgang Jan Zucha , Ellina Bernard , Raphael Kuhn , Michael Plötze , Alexander Puzrin","doi":"10.1016/j.clay.2024.107677","DOIUrl":"10.1016/j.clay.2024.107677","url":null,"abstract":"<div><div>Earth materials are subsoils used in construction due to their natural cementing properties. These properties originates from its clay fraction, which becomes cohesive during drying. Unlike common cement, earth materials are recyclable and have no CO<sub>2</sub> emission apart from manufacturing. Unfortunately, earth materials containing the abundant clay mineral smectite exhibit large swelling and shrinkage strains. Such earth materials are considered unsuitable for construction unless a stabiliser is added, which is commonly Portland cement or quicklime. This study explored the use of MgO-based cementitious Binder (MB) as alternative with a focus on the mineralogical effect of MB on smectite during hydration. A series of MB/smectite blends and MB components/smectite was cured up to six months to investigate the mineralogical changes and the formation of magnesium (alumino) silicate hydrate. The results showed that MB transformed smectite into Mg-hydroxy-interlayered smectite (Mg-HIS) within hours. The reason is the dissolution of MgO, a main constituent of MB. The dissolved Mg precipitates as Mg-hydroxy in the interlayer and transforms the smectite to Mg-HIS in this process. This is causing a pH increase and may prevent a complete HIS formation as the MgO dissolution mechanism will change once the pH is above the point-of-zero charge of MgO. An advantage of the smectite to Mg-HIS transformation is the strongly reduced the swelling/shrinkage properties of the clay. This suggests that adding MB to smectite could be a superior binding approach compared to quicklime, which primarily causes clay particle flocculation.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"265 ","pages":"Article 107677"},"PeriodicalIF":5.3,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143155818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Catalytic oxidation of toluene over the low-grade palygorskite clay from Linze region supported highly dispersed MnCe oxides catalysts: Preparation and performance

IF 5.3 2区地球科学

Applied Clay Science Pub Date : 2024-12-19 DOI: 10.1016/j.clay.2024.107681

Xuehua Zou , Xinyu Guo , Mengyuan Peng , Lanlan Dai , Fan Xu , Ping Zhang , Yuefei Zhou , Tianhu Chen , Chengzhu Zhu , Qiaoqin Xie

{"title":"Catalytic oxidation of toluene over the low-grade palygorskite clay from Linze region supported highly dispersed MnCe oxides catalysts: Preparation and performance","authors":"Xuehua Zou , Xinyu Guo , Mengyuan Peng , Lanlan Dai , Fan Xu , Ping Zhang , Yuefei Zhou , Tianhu Chen , Chengzhu Zhu , Qiaoqin Xie","doi":"10.1016/j.clay.2024.107681","DOIUrl":"10.1016/j.clay.2024.107681","url":null,"abstract":"<div><div>The natural palygorskite clay (Pal) resources are widely distributed in the Tianshui-Jingyuan-Huining-Linze sedimentary basins from east to west, Gansu Province, Northwest China. However, the application of this Pal has received insufficient attention due to the low-grade of palygorskite and hybrid mineral assemblage. In this paper, the Linze Pal was used as the support to prepare a series of Mn-Ce/Pal catalysts for catalytic oxidation of toluene. The catalysts were characterized by XRD, BET, Raman, XPS spectroscopy and TEM analysis. The results indicated that the particle sizes of Mn oxides were decreased and the dispersions were improved after doping with cerium. The strong interaction between Mn and Ce oxides increased the specific surface area, the content of Mn<sup>3+</sup> and Ce<sup>3+</sup> and the surface-adsorbed oxygen species of the Mn-Ce/Pal catalysts with the decrease of doping amount of cerium, which had significant effect on the catalytic activities of the catalysts for toluene oxidation. The 5 %Mn<sub>0.9</sub>Ce<sub>0.1</sub>/Pal catalyst exhibited the best performance for toluene oxidation and had a T<sub>90</sub> at 318 °C; meanwhile, this studied catalyst also displayed high long-term and regeneration stabilities. Therefore, this low-grade palygorskite clay in Linze region can be considered as a potential support to prepare the catalysts for toluene conversion.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"265 ","pages":"Article 107681"},"PeriodicalIF":5.3,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143155817","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synthesis and characterization of a layered double hydroxide as a novel, stable, and regenerable electrocatalyst for methylene blue elimination

IF 5.3 2区地球科学

Applied Clay Science Pub Date : 2024-12-19 DOI: 10.1016/j.clay.2024.107679

Meryem Salhi, Somia Louzri

{"title":"Synthesis and characterization of a layered double hydroxide as a novel, stable, and regenerable electrocatalyst for methylene blue elimination","authors":"Meryem Salhi, Somia Louzri","doi":"10.1016/j.clay.2024.107679","DOIUrl":"10.1016/j.clay.2024.107679","url":null,"abstract":"<div><div>This study aimed to create an affordable and effective electrocatalyst for removing methylene blue (MB). CuZnCr-layered double hydroxide was successfully prepared by a simple co-precipitation method. It was examined using various techniques including X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Scanning electron microscopy (SEM), X-ray fluorescence (XRF), Energy dispersive X-ray (EDX), and Thermogravimetric analysis (TGA), and then utilized for the electro-oxidation of MB. A UV–visible spectrophotometer was used to examine the impact of different operating parameters. The experimental findings revealed that the optimal applied potential, sodium chloride concentration, and operating time for complete discoloration of MB solution (10 mg.L<sup>−1</sup>) at neutral pH are 5 <em>V</em>, 0.05 M, and 30 min, respectively. As the initial MB concentration decreased and the chloride concentration increased, the degradation reaction kinetics accelerated, and followed the pseudo-first-order model. Significant removal efficiency was achieved at various pH values but lower pH was more favorable because of the inhibition of the oxygen evolution reaction. It is worth highlighting that CZC-LDH facilitates Cl adsorption for the ClOR (Chloride Oxidation Reaction) leading to the production of active chlorine contributing to indirect oxidation of MB. An increase in the production rate of active chlorine improved the oxidation process by increasing the applied potential. Enhancing the dye degradation was accomplished by combining electrochemical oxidation with solar photolysis. According to the results, the CZC-LDH electrode demonstrated good reusability and stability. Compared with previously published studies, this LDH electrode is low-cost, easy to prepare, and efficient.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"265 ","pages":"Article 107679"},"PeriodicalIF":5.3,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143155820","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Stabilization discrepancies of kaolin foams under different surfactant systems and their effects on the preparation of porous materials

IF 5.3 2区地球科学

Applied Clay Science Pub Date : 2024-12-14 DOI: 10.1016/j.clay.2024.107675

Chengwen Wang , Yanxiu Wang , Wei Sun , Runqing Liu , Li Wang , Le Tao , Anqi Yang , Shipei Wang

{"title":"Stabilization discrepancies of kaolin foams under different surfactant systems and their effects on the preparation of porous materials","authors":"Chengwen Wang , Yanxiu Wang , Wei Sun , Runqing Liu , Li Wang , Le Tao , Anqi Yang , Shipei Wang","doi":"10.1016/j.clay.2024.107675","DOIUrl":"10.1016/j.clay.2024.107675","url":null,"abstract":"<div><div>Porous materials have received extensive attention in the fields of industrial thermal insulation and green environmental protection due to their high porosity. The foam slurry stability is a key factor in the preparation of porous materials. Herein, a comparison of interfacial behavior and rheology of hexadecyl trimethyl ammonium bromide (SR), dodecyl sodium sulfonate (SDS), and synthetic vegetable protein foaming agent (WHZ) in gel systems reveals the effect of the kaolin foam stability on the pore formation. At 6 mg/mL agent concentration, the hydrophobicity degree of the kaolin surface was SR (80.12°) > WHZ (48.89°) > SDS (41.33°). In the kaolin foam slurry system, the capillary pressure generated by SR and WHZ can reach up to 5000 Pa and 2000 Pa. It effectively reduces the extrusion of the thin liquid film layer, and foam stabilization is still achieved during 3 h of static storage. Similar to SR, WHZ enables kaolin foam slurries to have a high storage modulus (100 Pa) at a particle loading of 50 wt%. This foam solid-state behavior and the stabilization enabled the preparation of a clay porous green body with pore sizes less than 100 μm and compressive strengths greater than 100 kPa.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"265 ","pages":"Article 107675"},"PeriodicalIF":5.3,"publicationDate":"2024-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143155224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Rapid microwave-assisted hydrothermal in situ synthesis of nano-ZnS/kaolinite nanocomposite: A non-toxic photocatalyst active under UV and sunlight

IF 5.3 2区地球科学

Applied Clay Science Pub Date : 2024-12-12 DOI: 10.1016/j.clay.2024.107669

Julie Smijová , Jonáš Tokarský , Kateřina Mamulová Kutláková , Pavlína Peikertová , Roman Gabor , Jiří Pavlovský , Hana Rajhelová

{"title":"Rapid microwave-assisted hydrothermal in situ synthesis of nano-ZnS/kaolinite nanocomposite: A non-toxic photocatalyst active under UV and sunlight","authors":"Julie Smijová , Jonáš Tokarský , Kateřina Mamulová Kutláková , Pavlína Peikertová , Roman Gabor , Jiří Pavlovský , Hana Rajhelová","doi":"10.1016/j.clay.2024.107669","DOIUrl":"10.1016/j.clay.2024.107669","url":null,"abstract":"<div><div>Clay mineral kaolinite (K) is suitable for the immobilization of nano-ZnS leading to increase in its photocatalytic activity (PA). Two synthesis methods, conventional hydrothermal (H) and microwave-assisted hydrothermal (M), and various reaction parameters (six reaction times, three <em>n</em><sub>Zn</sub>:<em>n</em><sub>S</sub> molar ratios) for nano-ZnS/K nanocomposites were compared. In addition to XRPD, FTIR, DRS and SEM analyses, PA was determined on acid orange 7 under UV irradiation (λ = 365 nm), and for selected samples also under natural sunlight. After 360 min of UV irradiation, PA 98 % (H; 210 min; 1:1) and 90 % (M; 30 min; 1:1) were reached. Under the sunlight, PA 97 % (H; 210 min; 2:1) and 93 % (M; 20 min; 2:1) were achieved after 540 min, respectively. Lipid peroxidation tests revealed the inhibition of peroxidation for all nanocomposites. The non-toxicity and hight PA under sunlight suggest the potential for outdoor use of nanocomposites in water purification or construction industry.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"265 ","pages":"Article 107669"},"PeriodicalIF":5.3,"publicationDate":"2024-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143155221","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0