ChemistrySelect
·
2024
·Vol. 9
·期 27
·e202303733
·
IF 1.9
Yao Gu,Dongjian Shi,Liang Wang,Mingqing Chen
Graphical A range of Fe 3 O 4 /Ag/BiVO 4 /sepiolite composite materials, featuring varying Fe 3 O 4 concentrations, were synthesized utilizing the co-precipitation method. The inherent magnetic characteristics of Fe 3 O 4 , combined with the resultant Z-type heterojunction structure, confer exceptional photo-catalytic prowess upon the material. This enables swift degradation of rhodamine B, and furthermore, facilitates its retrieval for subsequent reuse. To increase specific surface area and light utilization of photo-catalysts, a series of Fe 3 O 4 /Ag/BiVO 4 /sepiolite composites with different Fe 3 O 4 contents were synthesized via co-precipitation. The structure, composition, and optical properties of these composites were characterized using X-ray diffraction (XRD), nitrogen adsorption and desorption (BET), UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS), and fluorescence spectroscopy (PL). The photo-catalytic activity of the composites was further evaluated using rhodamine B as a model for photo-catalytic degradation. The results revealed that the composites with optimal Fe 3 O 4 loading exhibited the narrowest bandgap width, approximately 2.13 eV, and the highest electron-hole pair separation efficiency. Rhodamine B could be almost completely degraded within a short illumination time in the presence of the Fe 3 O 4 /Ag/BiVO 4 /sepiolite composites. The degradation mechanism of rhodamine B was proposed to involve the improvement of the photo-catalytic activity of the resulting composites by the Fe 3 O 4 and the Z-type heterojunction structure. Additionally, the composites could be recycled and reused multiple times, making them an environmentally friendly and sustainable option.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2021
·Vol. 13
·期 22
·3890
·
IF 4.329
Chenlu Jiao,Die Liu,Nana Wei,Jiannan Gao,Fan Fu,Tao Liu,Jian Wang
Porous sustainable cellulose/gelatin/sepiolite gel beads were fabricated via an efficient ‘hydrophilic assembly–floating droplet’ two-step method to remove Congo red (CR) from wastewater. The beads comprised microcrystalline cellulose and gelatin, forming a dual network framework, and sepiolite, which acted as a functional component to reinforce the network. The as-prepared gel beads were characterized using FTIR, SEM, XRD, and TGA, with the results indicating a highly porous structure that was also thermally stable. A batch adsorption experiment for CR was performed and evaluated as a function of pH, sepiolite addition, contact time, temperature, and initial concentration. The kinetics and isotherm data obtained were in agreement with the pseudo-second-order kinetic model and the Langmuir isotherm, with a maximum monolayer capacity of 279.3 mg·g−1for CR at 303 K. Moreover, thermodynamic analysis demonstrated the spontaneous and endothermic nature of the dye uptake. Importantly, even when subjected to five regeneration cycles, the gel beads retained 87% of their original adsorption value, suggesting their suitability as an efficient and reusable material for dye wastewater treatments.Keywords:microcrystalline cellulose;gelatin;sepiolite;beads;dye;adsorption
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·
IF 0
Jiang Yongwei,Cao Lei,Ma Genchao,Xu Chao,Li Linrui,Wang Zhihui,Xia Mingzhu,Wang Fengyun
Being able to cause eutrophication, a severe ecological problem that leads to the demise of aquatic animals, excessive phosphate in water bodies, has been a threat to the environment. Aiming to remove phosphate from wastewater in rural areas, adsorption is a promising method. In this study, a novel phosphate adsorbent, SEP-La, was synthesized by doping lanthanum into sepiolite. Characterization and batch adsorption experiments were performed. Lanthanum was loaded on sepiolite through hydrogen bond as forms of peroxides, and it greatly enhanced the adsorption capacity of sepiolite, reaching 135.78 mg/g. Pseudo-second-order kinetic model described the adsorption kinetics the best, indicating a chemisorption process. An endothermic yet spontaneous adsorption process was revealed by the fitting of the Langmuir isotherm model. The adsorbent exhibited great tolerance to pH change and interference ions. The remaining 67.82% of the original performance after 6 cycles of adsorption–desorption demonstrated its robust recyclability. Its real application potential was also manifested through column experiments using locally collected real wastewater and was able to treat 2072 mL of water per gram of adsorbent, which represents a significant milestone in translating theory into practice. FT-IR, XRD, and XPS were performed to prove that its mechanism involved electrostatic interaction and ligand exchange. This work provides an affordable while auspicious phosphate adsorptive material with the potential to effectively address the issue of excessive phosphate in water at a low cost.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Si Ye,Yufeng Wang,Bohao Du,Lei Cheng,Lixian Sun,Puxuan Yan
The design of an efficient and reusable monolithic catalyst is important for catalyzing the hydrolysis of NaBH 4 to generate H 2 . Herein, an aerogel catalyst was prepared by freeze-drying of hydrazine modified cellulose nanofibers (NH 2 NH-CNF), polyvinyl alcohol (PVA) and B-doped CoP loaded sepiolite nanofibers. Further chemical cross-linking using glutaraldehyde (GA) resulted in better mechanical properties and shape recovery. Among them, the catalytic active component B-CoP@aSep has a low activation energy of 35.7 KJ·mol −1 . In addition, the optimized composite aerogel catalyst can get hydrogen generation rate ( 3534 m L m i n - 1 g c a t a l y s t - 1 ), which was maintained at 79.4% even after 5 cycles of testing. The better mechanical and catalytic properties of aerogel catalysts are mainly attributed to the overall three-dimensional layered porous structure maintained by chemical bonds and the heterogeneous interface formed by B-doped CoP.
研究领域:
材料科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 56
·84410-84420
·
IF 5.19
Chen Anwen,Liu Wei,Soomro Razium Ali,Wei Yi,Zhu Xun,Qiao Ning,Kang Yueqi,Xu Bin
Graphene oxide (GO) is an excellent membrane-forming material with unique two-dimensional transport channels and excellent adsorption properties for heavy metal contaminants. However, swelling under cross-flow conditions and long-term water immersion leads to poor separation performances. To improve the stability of GO membrane materials, we propose a PVA-integrated graphene oxide/attapulgite membrane (GOAP) with a 3D microstructural arrangement of “brick–mortar-brick.” The addition of PVA as mortar reinforces the strength of the structures via induced hydrogen bonding within the 3D water transport network. Furthermore, the Al 2 O 3 ceramic substrate pre-treated with (3-aminopropyl) triethoxysilane (APTES) provided high mechanical stability to the composite membrane, extending the membrane’s stability beyond a month of immersion without swelling or shedding. The PVA-integrated GO/ATP composite membrane maintained a rejection rate of 99% for Cu 2+ solution (100 mg/L) in a 26-h continuous with nearly 100% rejection for various metals ions such as Cu 2+ , Ni 2+ , Pb 2+ , and Cd 2+ . The membrane exhibited a water flux of 20.7 L·m −2 ·h −1 , which was 15.9-fold high than the pure GO membrane (GOM). The high water flux and heavy metal filtration rate with superior stability proved the practical suitability of the composite film for removing heavy metal ions. Graphical abstract
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Sciences
·
2020
·
IF 4.302
Hui Yu,Yongfeng Zhu,Aiping Hui,Fangfang Yang,Aiqin Wang
The aqueous foam template without any solvent and only using the particles stabilizer has attracted much attention for preparation of the porous adsorbents. Herein, a novel porous adsorbent was fabricated via thermal-initiated polymerization of Pickering aqueous foams, which was stabilized by the natural sepiolite (Sep) and pine pollen, and utilized for the removal of antibiotic from aqueous solution. The stabilizing mechanism of Pickering aqueous foam of that the Sep was modified with the leaching substance from pine pollen and arranged orderly around the bubble to form a dense “shell” structure was revealed. The adsorbents possessed the hierarchical porous structure and excellent adsorption performance for antibiotic of chlorotetracycline hydrochloride (CTC) and tetracycline hydrochloride (TC). The equilibrium adsorption capacities of CTC and TC were achieved with 465.59 and 330.59 mg/g within 60 min at 25°C, respectively. The adsorption process obeyed Langmuir model and pseudo-second-order adsorption kinetic model. This work provided eco-friendly approach for fabricate porous adsorbents for wastewater treatment .
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Xiaoxiang Cheng,Yi Chai,Yinuo Liu,Yan Jin,Lijie Zhang,Feiyong Chen,Daoji Wu,Xinsheng Luo
Dynamic membranes (DMs) can effectively mitigate ultrafiltration membrane fouling by forming a dynamic barrier layer. However, DMs still face challenges in balancing separation efficiency, antifouling capacity, and regeneration frequency during practical applications. Herein, we propose a novel catalytic DM synergistically integrated with sepiolite (SEP) and cobalt-copper layered double hydroxide (Co-Cu-LDH). The prepared membrane exhibited a three-dimensional (3D) fibrous SEP network integrated within the substrate membrane, embedding with a Co-Cu-LDH catalyst layer. This structure significantly enhanced peroxymonosulfate (PMS) activation, leading to the generation of hydroxyl radical, superoxide radical, sulfate radical and singlet oxygen species. The LDH-SEP DM/PMS system achieved superior performance in treating secondary effluent, removing 92.3 % of dissolved organic carbon. Due to the synergistic effect of foulant interception and catalytic oxidation, the LDH-SEP DM exhibited excellent antifouling performance. Following three cycles filtration of secondary effluent, the membrane flux dropped by only 10 %, with the flux recovery rate of 99 %. Membrane fouling mechanism has also been changed, and the formation of cake filtration was significantly delayed. Overall, this work not only advances the mechanistic understanding of PMS activation via Co-Cu-LDH, but also provides a scalable strategy for designing multifunctional membranes tailored for high-efficiency, low-maintenance water purification systems.
研究领域:
环境工程
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材料科学
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水处理技术
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催化化学
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膜分离技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2015
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IF 2.467
Hong-wei Yu,Shan-shan Yang,Hui-min Ruan,Jiang-nan Shen,Cong-jie Gao,Bart Van der Bruggen
A polyacrylonitrile/palygorskite composite chemically modified with amidoxime groups was prepared by free-radical graft polymerization of acrylonitrile onto 3-glycidyloxypropyl trimethoxy silane (KH-560)-modified palygorskite and characterized by Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD). Adsorption of uranium(VI) from simulated seawater on the material was investigated. Batch experiments were carried out to study the effects of initial pH, contact time, initial feed concentration and ionic strength on uranium removal. The solution pH values had a major impact on uranium(VI) adsorption with optimal adsorption observed around pH 5. The kinetic data followed the pseudo second-order process. The equilibrium data fitted the Freundlich model well and the maximum adsorption capacity was found to be 78.13 mg/g. The ionic strength did not significantly affect uranium removal and chemisorption was assumed to describe the uranium adsorption. Desorption was performed using 0.1 M HCl solution, and the regenerated adsorbents could be reused with little loss of adsorption capacity after five cycles.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
DYES AND PIGMENTS
·
2020
·
IF 4.613
Xiayi (Eric) Hu,Xuechun Feng,Mingming Fei,Mi Tian,Rui Zhang,Yefeng Zhou,Yang Liu,Zhaogang Zeng
The application of organic dyes in industry is severely limited due to its insolubility and instability. The adsorption of organic dyes by inorganic materials to form hybrid pigment is a valid method to improve its stability, thus widening its applications in industries. A simple method for preparing stable hybrid pigment by adsorpting Acid Red 73 (AR73) on the chitosan (CTS) modified sepiolite with a SiO2 coating is explored in this work. Sepiolite modified by the CTS was used to immobilize AR73 (CTS-sep/AR73) uniformly to form a hybrid pigment. The effects of the dosage of CTS, the concentration of acetic acid (HAc) and the pH of AR73 solution for CTS-sep adsorption of AR73 were investigated. CTS-sep/AR73 was further coated with a layer of SiO2 to form the CTS-sep/AR73@SiO2 pigment, which enhanced the stabilities of the hybrid pigment. The CTS-sep/AR73@SiO2 pigment shows excellent stability in strong acid, strong alkali and anhydrous ethanol environment, along with the improved thermal ageing, intensified UV resistance, and enhanced thermal stability (more than 220 °C) which is higher than that of CTS-sep/AR73 hybrid pigment.
研究领域:
材料科学
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化学工程
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颜料技术
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环境科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 15
·6356-6362
·
IF 9.931
Qingze Chen,Runliang Zhu,Shaohong Liu,Dingcai Wu,Haoyang Fu,Jianxi Zhu,Hongping He
Nanostructured silicon is an attractive anode material for next-generation lithium-ion batteries, but its commercialization remains a challenge owing to the energy-intensive, costly, and complex preparation of nanostructured silicon. Herein, one-dimensional (1D) silicon nanorods (SNRs) have been synthesized from natural sepiolite by a simple self-templating synthesis method. The intrinsic crystal structure and chemical composition of sepiolite allow for the maintenance of 1D structures during magnesiothermic reduction without any additional templates and heat scavengers. The as-prepared SNRs showed a large specific surface area (∼122 m2 g−1) and hierarchical porous structure (i.e., macro- and meso-pores). As anodes for lithium-ion batteries, SNRs exhibited a high reversible capacity of 1350 mA h g−1 at 1.0 A g−1 after 100 cycles, and 816 mA h g−1 at 5.0 A g−1 after 500 cycles (with a capacity retention of 98%). With a low-cost precursor and facile approach, this strategy for synthesizing 1D nanostructured Si would be promising in practical production of high-performance anode materials for lithium-ion batteries.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL LETTERS
·
2020
·
IF 1.467
Bing Bai,Ze Zhang,Xiaowei Zhao
Adsorption offers an efficient and eco-friendly method for the recovery of rare earth elements (REEs). However, it is not well known that most adsorbents are not eco-friendly. Rational design of next generation adsorbents should aim to enhance their green properties. In this work, sepiolite, Fe3O4 and itaconic acid were selected as the green raw materials. Poly(itaconic acid)/magnetite sepiolite composite (PIA/MSEP) was prepared using water as the solvent under mild reaction conditions and the entire process uses neither the bulk use of toxic organic solvents nor the addition of dangerous strong acid or alkali. The results indicate that PIA/MSEP has satisfactory maximum adsorption capacities of 178.57, 151.52 and 106.38 mg·g−1 for Er3+, Nd3+ and Ce3+, respectively, with excellent regeneration stability. The PIA/MSEP exhibits outstanding adsorption rates that provide above 90% capacity within 10 min for Er3+ and Nd3+. This versatile material is a potential candidate for applications in the removal of REEs.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2022
·Vol. 33
·期 42
·425601
·
IF 3.953
Wenwu Jiang,Yi Han,Yanhuai Ding
Electrospun PAN/PVdF-HFP membranes have the potential to be used as separators for Li-ion batteries owing to their good mechanical properties and high chemical stability. However, the application of PAN/PVdF-HFP separators has been hampered by their poor electrochemical performances. In this study, semi-aligned PAN/PVdF-HFP nanofiber separators have been fabricated by an electrospinning technology. Sepiolite and ZIF-67 co-modification was employed to enhance the physical properties of the PAN/PVdF-HFP separators. The test cells with the as-prepared composite separator showed better electrochemical performance than the commercial and raw PAN/PVdF-HFP separators.
研究领域:
材料科学
·
能源存储
·
纳米技术
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）