Journal of Sustainable Metallurgy
·
2025
·
IF 3.2
Shao Shuang,Ma Baozhong,Wang Chengyan,Chen Yongqiang
Extracting Al from coal gangue has the double benefits of realizing the high-value application of coal gangue and mitigating the scarcity of bauxite resource. The key Al-containing minerals in coal gangue include kaolinite and boehmite, and thermal activation is pivotal for stimulating their reactivity. In this study, kaolinite and boehmite were subjected to thermal activation and acid leaching to explore the intrinsic link between their thermal evolution and leaching activity. Results showed that the phase evolution of kaolinite followed a multi-step sequential process in the order of kaolinite → metakaolinite → γ -Al 2 O 3 → mullite, and Al V in metakaolinite was highly active. For boehmite, it underwent the transformation of boehmite → γ -Al 2 O 3 → δ -Al 2 O 3 → θ -Al 2 O 3 and α -Al 2 O 3 successively. Their reactivity in descending order was γ -Al 2 O 3 > δ -Al 2 O 3 > boehmite > α -Al 2 O 3 . Furthermore, a comparative study of leaching temperature demonstrated that elevated temperature favorably strengthened the thermodynamic driving force and greatly promoted the Al extraction. This study is of some theoretical significance for guiding the thermal activation and acid leaching of coal gangue. Graphical
研究领域:
矿物加工
·
材料科学
·
冶金学
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 137
·期 39
·49158
·
IF 2.52
Yanyang Han,Haimei Wang,Xiuling Jiao,Dairong Chen
Poly(vinyl alcohol) (PVA) networks cross-linked by inorganic nanofillers-boehmite (AlOOH) nanowires via strong hydrogen bonding was prepared by a facile strategy. These PVA-AlOOH composites displayed significantly enhanced mechanical and thermal properties due to the excellent mechanical property and high heat resistant of AlOOH nanowires, as well as the strong hydrogen bonding formed between PVA and AlOOH. Interestingly, it was worth mentioning that the PVA-AlOOH composites exhibited excellent shape memory behavior. The strong hydrogen bonding between PVA matrix and AlOOH nanowires acted as the hard segments to maintain the permanent shape, while the weak one between PVA chains served as switching segments to fix the temporary shape and recover to the permanent shape. This physical cross-linked system provided a simple and efficient strategy to obtain smart shape memory materials.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2017
·
IF 4.873
Chengfeng Zhang,Zhenghai Tang,Baochun Guo
Interfacial interaction plays a vital role in the final properties of polymer composites as it affects the filler dispersion and stress transfer in the composites. In this study, we utilized two types of phosphate ester, hydroxyethyl methylacrylate phosphate (PH) and butyl phosphate (PB), as modifiers in boehmite (BM)-filled styrene-butadiene rubber (SBR) to tailor the interfacial structures in the composites. The modification mechanism of phosphate ester on BM and the interfacial structure in the composites are characterized. In PH-modified BM/SBR composites, a covalently bonding interface is obtained because PH can act as molecular bridge that can form covalent linkage with both BM and SBR chains. Consequently, the resulting composites show significantly improvements in the physical and mechanical properties of the composites. While in PB-modified BM/SBR composites, the properties of the composites are slightly improved due to the lack of covalent linkage in the interface.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Xiangyu Wang,Tao Wang,Jun Ma,Huiling Liu,Ping Ning
A novel composite based on hydrophilic boehmite-PVB/PVDF blended membrane- immobilized nanoscale zero-valent iron (nZVI) (BPPN) was synthesized. When the initial concentration of Cr(VI) was 20 mg/L, 100% Cr(VI) was removed by BPPN at an initial pH of 4.08 under room temperature of 25 °C within 90 min. In addition, the reactivity of the regenerated BPPN composites toward Cr(VI) removal were not obviously declined after 6 cycles. The resultant BPPN demonstrated high reactivity, preeminent stability and reusability in the reaction course. Meanwhile, the BPPN composites showed a higher removal efficiency toward the removal of Cr(VI) compared with alumina-PVB/PVDF-nZVI (APPN) composites. The plentiful hydroxyl groups of boehmit on the BPPN surface resulted in the enhancement in hydrophilicity and improved Fe 0 loading of the BPPN composites. For environmental parameters, results indicated that there was a negative effect of increasing the initial concentration or decreasing reaction temperature toward the removal of Cr(VI) by BPPN, and that the acidic and neutral conditions showed more favorable effect on Cr(VI) removal than the alkaline ones. The generated ferrous ions on the surface of BPPN were certified to play an important role in removal of Cr(VI). XPS analysis suggested that the reduction reaction of Cr(VI) occurred on the surface of the composite and produced precipitation of Cr(III). The Cr(VI) removal by BPPN composite was found to follow a revised kinetics well. This study suggests that the novel BPPN composite possessing excellent performance may be a promising functional material of heavy metal wastewater treatment.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2013
·
IF 2.77
Yuhang Cai,Mengmeng Zhao,Henti Wang,Yongjin Li,Zhigang Zhao
Flame-retardant nanocomposites with high transparency based on poly (vinyl alcohol) (PVA) and pseudo-boehmite nanorods have been fabricated by synthesis of pseudo-boehmite nanorods and subsequent solution blending with PVA. The morphology and physical properties of PVA/pseudo-boehmite nanocomposites have been characterized systematically. Scanning electron microscopy investigations showed the homogeneous dispersion of pseudo-boehmite nanorods within PVA matrix even at very high nanorods loadings. The nanocomposites with 37.5 wt% pseudo-boehmite nanorods exhibit limit oxygen index (LOI) as high as 30.0 with the transmittance of more than 90% at the visible region and the enhanced refractive index . Moreover, the incorporation of the pseudo-boehmite nanorods increases the modulus and the tensile strength of PVA, indicating the significantly enhanced surface hardness of the nanocomposite. It is considered that the prepared PVA nanocomposites are not only useful as flame-retardant fibers, a long term pursued target for PVA fabrics, but also as optical appliances with its excellent transparency and high refractive index.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Song Han,Xiang Cheng,Longheng Xiao,Xiangtao Huo,Min Guo,Mei Zhang
The self-assemble hydrophobic aerogel-like hollow boehmite microspheres adsorbents were prepared by surface silylation modification method using methyltrimethoxysilane silanizing agent. The density of the adsorbents was as low as 0.1 g/cm 3 , the average pore diameter was 12.2–15.3 nm, and the water contact angle was 130°∼143.8°. The hollow microsphere adsorbents could uptake 8.51 g/g for engine oil , 8.42 g/g for peanut oil, 7.29 g/g for kerosene and 5.80 g/g for n-hexane. After 20 regeneration cycles in n-hexane, the regeneration rate of the adsorbent was still as high as 95.17 %，meaning adsorption capacity of the adsorbent did not decrease significantly. The aerogel-like hollow boehmite microspheres with good hydrophobicity can be used as a kind of potential candidate material to remove different oils and organic liquids.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2023
·Vol. 34
·期 24
·245401
·
IF 3.5
Wenjing Fu,Cundi Wei,Shaonan Xu,Enhui Wang,Jinyi Zhang,You Xu,Jiyuan Zou,Jilun Wei,Jing Zuo
A particular bird's nest-like pseudo-boehmite (PB) composed of cohesive nanostrips was prepared by a novel and facile approach based on the reaction of Al–Ga–In–Sn alloy and water, together with ammonium carbonate. The PB possesses a large specific surface area (465.2 m2 g−1), pore volume (1.0 cm3 g−1), and pore diameter (8.7 nm). Subsequently, it was utilized as a precursor to form the TiO2/γ-Al2O3 nanocomposite for tetracycline hydrochloride removal. The removal efficiency can reach above 90% at TiO2:PB = 1:1.5 under the Sunlight irradiation simulated by a LED lamp. Our results indicate that the nest-like PB is a promising carrier precursor for efficient nanocomposite catalysts.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
ACS ES&T Water
·
2024
·
IF 4.8
Minye Huang,Pingxiao Wu,Jiayan Wu,Leiye Sun,Zhongbo Shang,Tianming Wang,Liu Sheng,Nengwu Zhu
In an aqueous environment, the aggregation between minerals and polystyrene nanoplastics (PSNPs) is a crucial process affecting the geochemical behavior of PSNPs. Mineral morphology is an important factor determining their properties, further influencing the heteroaggregation of PSNP-minerals. In this study, the aggregation between PSNPs and three morphologies of boehmite (γ-AlOOH) was investigated, and the effects of pH, electrolytes, and hydrogen bonds were discussed to further explore the mechanism. The results showed that boehmite played an important role in the aggregation. The heteroaggregation behavior was inhibited with the decrease of pH or the increase of electrolyte concentration, which followed the DLVO theory. The heteroaggregation extent of PSNPs among boehmites was rod-shaped boehmite (Rod-boe) > flake-shaped boehmite (Flake-boe) > fiber-shaped boehmite (Fiber-boe), which could be explained by the different contents of hydroxyl groups of boehmites and the formation of hydrogen bonds. Furthermore, natural samples from the Pearl River with a salinity gradient were collected for aggregation experiments. The results showed that electrolyte is an important factor in the aggregation of PSNPs in natural water. Our study reflected the important role of mineral morphology in the aggregation of PSNPs and provided new insights into the potential fate of PSNPs in an aqueous environment.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2019
·
IF 3.89
Shangying Li,Hongping He,Qi Tao,Yunfei Xi,Aiqing Chen,Shichao Ji,Chaoqun Zhang,Yiping Yang,Jianxi Zhu
In this study, beidellite , paragonite and other 2:1 type layered aluminosilicates with high layer charges (2:1 type LA-HLC) were synthesized under hydrothermal conditions by using boehmite as a precursor. The concentrations of dissolved Al from boehmite precursor had important effects on the mineral components of the hydrothermal products and the layer charge density of the resultant minerals. A combination of 2:1 type LA-HLC, paragonite, and minor beidellite formed at a relatively high concentration of dissolved Al, while beidellite with a small amount of 2:1 type LA-HLC was produced at a low concentration of dissolved Al. The resultant 2:1 type LA-HLC exhibited poor swelling ability when treated with ethylene glycol. A solid-state transformation mechanism was proposed for the transformation based on the HRTEM images and EDS analyses, which showed that lattice fringes representing (001) faces of 2:1 type layered aluminosilicates (2:1 type LA) were parallel to the (020) direction of boehmite. The successful transformation of boehmite into 2:1 type LA provides insights to well understand the formation of 2:1 type LA in geological processes and offer a facile preparation approach for the synthesis of 2:1 type LA with different layer charges.
研究领域:
地质学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2023
·
IF 6.2
Bo Wang,Xiaogang Liu,Xinrui Miao,Wenli Deng
A facile approach for fabricating multifunctional superhydrophobic coating was developed through a simple dip-coating process. The boehmite particles (BMPs) were adhered and modified onto stainless steel (SS) mesh through polydopamine (PDA), which was formed by the oxygen-induced polymerization of dopamine (DA). Therefore, the roughness structure (SS-PDA@BMPs mesh) was obtained. Meanwhile, due to the catechol group of the PDA, cetylamine (CTA) with low surface energy and amino group was grafted onto PDA via the Michael addition reaction to construct the superhydrophobic coating (CTA@PDA@BMPs). The effects of the morphology of BMPs, the ratio of BMPs to DA, the reaction time, and the concentration of CTA on superhydrophobicity of SS-CTA@PDA@BMPs mesh were discussed, which showed the water contact angle of 164° and the sliding angle of 3° for the SS-CTA@PDA@BMPs mesh fabricated under optimal conditions. The SS-CTA@PDA@BMPs mesh with great chemical stability and mechanical durability displayed excellent self-cleaning property and oil/water separation efficiency. When the PU sponge was coated with CTA@PDA@BMPs coating by the same process, the superhydrophobic PU sponge was obtained, which exhibited superior reusability and flame retardancy property. Thus, the prepared superhydrophobic materials are multifunctional and environmentally friendly.
研究领域:
材料科学
·
表面工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Kezhuo Li,Gaoqian Yuan,Long Dong,Gao Deng,Hongjuan Duan,Quanli Jia,Haijun Zhang,Shaowei Zhang
As a toxic azo anion dye, Congo Red (CR) in waste-water poses a potential threat to the environment and human health. An absorbent is often used for its removal, during which, however, the role played by the functional groups is still not fully understood. In this work, a boehmite aerogel with a specific surface area as high as 305 m 2 /g was successfully developed by a combined sol–gel and freeze-drying method, and its CR adsorption capacity reached as high as 1962 mg·g −1 . The adsorption process was dominated by a chemisorption mechanism and could be well described by the Langmuir isothermal model. The combination of the density functional theory (DFT) calculations and experimental results suggested that the amino protonation was responsible for the additional enhancement of CR adsorption in an acidic medium. The adsorption process occurred via interactions between boehmite aerogels and the SO 3 functional groups of CR. Additionally, the NH 3 group resultant from the protonation of NH 2 functional groups of CR in an acidic medium significantly enhanced the CR adsorption on the boehmite aerogels. This work not only developed an ultrahigh efficiency anion adsorbent for CR removal, but also provided a new strategy for the exploration of new adsorbents with further improved performance.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2022
·Vol. 104
·期 2
·300-310
·
IF 2.606
Wang Linyan,Li Wenjie,Pang Tianliang,Liu Hang,Wang Chan,Zhou Liang,He Fei
Nanofiber-like and nanorod-like boehmite aerogels (BAs) were synthesized by using 1D boehmite nanofibers and nanorods as building units and chitosan as binder via sol-gel process and freeze-drying method. Two kinds of boehmite sols were both gelled via ammonia vapor gelation method. Nanofiber-like building units interconnect and tangle to form high-surface-area porous structures of BA-160, while nanorod-like ones self-accumulate and overlap to construct large-pore-diameter skeletons of BA-200. The compressive property of BAs mainly originates from the interaction of overlap joints between building units, and the overlap joints among nanofibers provide more anti-pressure positions than the ones among nanorods. The skeletons are further enhanced under the help of chitosan macromolecules due to the improved polycondensation between aluminoxane via ammonia vapor. With the increase of chitosan content, the mechanical properties of BAs increase, but the thermal conductivities decrease. All of ultralight BAs can be regarded as good thermal insulation materials.
Nanofiber-like and nanorod-like boehmite aerogels (BAs) were synthesized by using 1D boehmite nanofibers and nanorods as building units and chitosan as binder via sol-gel process and freeze-drying method. Boehmite sols turning into gels were induced by ammonia vapor, which is beneficial to homogeneous gelation of boehmite sols. Two kinds of BAs possess different mechanical properties due to different porous structural characteristics. All of BAs present the features of ultralight and thermal insulation.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）