Nature Communications
·
2022
·Vol. 13
·期 1
·1-10
·
IF 17.694
Liu Na,Li Qiaoqiao,Wan Hujie,Chang Libo,Wang Hao,Fang Jianhua,Ding Tianpeng,Wen Qiye,Zhou Liujiang,Xiao Xu
Although Ti 3 C 2 T x MXene is a promising material for many applications such as catalysis, energy storage, electromagnetic interference shielding due to its metallic conductivity and high processability, it’s poor resistance to oxidation at high temperatures makes its application under harsh environments challenging. Here, we report an air-stable Ti 3 C 2 T x based composite with extracted bentonite (EB) nanosheets. In this case, oxygen molecules are shown to be preferentially adsorbed on EB. The saturated adsorption of oxygen on EB further inhibits more oxygen molecules to be adsorbed on the surface of Ti 3 C 2 T x due to the weakened p-d orbital hybridization between adsorbed O 2 and Ti 3 C 2 T x , which is induced by the Ti 3 C 2 T x /EB interface coupling. As a result, the composite is capable of tolerating high annealing temperatures (above 400 °C for several hours) both in air or humid environment, indicating highly improved antioxidation properties in harsh condition. The above finding is shown to be independent on the termination ratio of Ti 3 C 2 T x obtained through different synthesis routes. Utilized as terahertz shielding materials, the composite retains its shielding ability after high-temperature treatment even up to 600 °C, while pristine Ti 3 C 2 T x is completely oxidized with no terahertz shielding ability. Joule heating and thermal cycling performance are also demonstrated.
研究领域:
材料科学
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纳米技术
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表面化学
✓ 已验证
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Xinliang Li
In the present work, a type of amphiphilic alkyl quaternary ammonium salt, dimethyl distearylammonium chloride (DAC), was introduced and used as a selective flocculant in kaolin and bentonite suspensions. The selective flocculation property was evaluated by turbidity tests, floc size measurements, zeta potential variation, contact angle measurements and scanning electron microscopy (SEM) observation. The results indicated that an appropriate amount of DAC could achieve selective flocculation at alkaline condition. Based on the experimental facts from size, zeta potential and contact angle measurements, the different flocculation mechanisms of kaolin and bentonite were also investigated. For kaolin suspension, charge neutralization was quite predominant. At different pH level, a low dosage (45 mg/L) of DAC always caused excellent flocculation while high dosage (> 45 mg/L) gradually leaded to restabilization owing to the electrostatic exclusion. For bentonite suspension, bridging effect played the key role. Under acidic condition, bentonite particle always performed good flocculation phenomena at different DAC dosages. But it would gradually lead to enhanced flocculation efficiency from poor to good with increasing the dosage of DAC under alkaline condition. As a result, DAC showed the selective flocculation performance by controlling the dosage of DAC and pH, which provided us the guidance on designing more effective selective flocculant in complex clay mixture system.
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DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Zhengyu Dong,Qian Zhang,Junming Hong
Novel iron–carbon–bentonite–alginate beads (Fe/C-BABs) were prepared by sol–gel method to trigger advanced Fenton oxidation to realize benzalkonium chloride (BAC) degradation. Degradation results revealed that the optimal conditions of H 2 O 2 /Fe/C-BABs for BAC degradation were pH 3.0, [BAC] = 50 mg/L, [H 2 O 2 ] = 60 mM, and [Fe/C-BABs] = 50.0 g/L (wet weight). BAC removal efficiency reached 87% within 30 min. Results indicated that BAC degradation was mainly attributed to the heterogeneous rather than the homogeneous reaction. The catalyst showed high-efficiency catalytic performance and ability to control metal-ion leaching to avoid environmental pollution. To expound the pathway of BAC degradation, gas chromatography–mass spectrometry analysis method was used to examine the intermediate products, and a plausible degradation pathway was also proposed. The oxidation of the benzene ring and long-chain alkane into organic acids indicated BAC degradation and nontoxicity of the products.
研究领域:
环境化学
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高级氧化技术
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水处理
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催化
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污染物降解
✓ 已验证
DOI
高影响因子
CHEMICAL PHYSICS
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2025
·
IF 2.4
Yanqiao Dong,Junfang Liu
To enhance the performance of bentonite-based barrier systems under heavy metal contamination, this study introduced corn straw biochar as an adsorptive amendment into polymer-modified calcium bentonite, successfully developing a polymer-modified calcium bentonite-biochar composite barrier material (PB8@C8). Through systematic evaluation of compressive strength, permeability coefficient, swell index, and adsorption performance, the optimal biochar content was determined to be 8 %. At this ratio, the material exhibited significant improvements in permeability coefficient, swell index, and adsorption capacity. Although the compressive strength slightly decreased, it still met the engineering requirement of 103.4 kPa. Microstructural characterization techniques such as XRD, SEM, FTIR, and BET confirmed the successful incorporation of biochar into the modified calcium bentonite, introducing abundant hydroxyl and carboxyl functional groups as well as a larger specific surface area, thereby enhancing the adsorption performance. Analysis of the Pb 2+ adsorption behavior indicated that the adsorption process of PB8@C8 better conformed to the pseudo-second-order kinetic model and the Langmuir isotherm model, suggesting monolayer chemical adsorption as the dominant mechanism. Under the conditions of pH = 6, an adsorbent dosage of 0.25 g, and an initial Pb 2+ concentration of 500 mg/L, the adsorption capacity of PB8@C8 for Pb 2+ reached 195.98 mg/g.
研究领域:
环境工程
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材料科学
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重金属修复
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岩土工程
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吸附技术
✓ 已验证
产品关联
DOI
高影响因子
FIBERS AND POLYMERS
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2025
·
IF 2.3
Qu Sitian,Lin Tao,Yin Xuefeng,Xing Luyi,Li Chenyang,Peng Guoqiang
The rapid advancement of information technology has led to an increase in electromagnetic interference (EMI) issues, as electronic devices are now widely utilized, requiring materials with greater versatility. This study developed an efficient preparation method utilizing alternating vacuum filtration (AVF) technology to overcome this issue. Through the precise control of the deposition sequence of cellulose nanofibers (CNF)/Na-bentonite (NB) and MXene conductive layers, this study successfully prepared CNF/NB–MXene composite films with a well-structured alternating layered structure. The composite film exhibited a distinctive "brick–mortar" architecture, imparting favorable mechanical properties (i.e., 8.17 MPa tensile strength). Measuring 41 μm thick, the composite film exhibited a conductivity of 189.6 S m –1 , along with EMI shielding effectiveness (SE) of 34.3 dB and SE per unit thickness (SE/t) of 8365.85 dB cm –1 in the X-band. Furthermore, the composite film demonstrated a high limiting oxygen index (LOI) of 36.5% and a residual carbon content exceeding 70%, which indicated exceptional flame retardancy. Consequently, the alternating layered composite film exhibited superior EMI performance and flame-retardant performance, making it particularly advantageous in harsh environments such as high temperatures.
研究领域:
材料科学
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纳米技术
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电磁干扰屏蔽
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聚合物复合材料
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防火材料
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产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2020
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IF 4.551
Xiaoping Men,Qiaoxia Guo,Bo Meng,Shenyong Ren,Baojian Shen
Bisphenol A (BPA) is a pollutant in the sewage of petroleum and petrochemical field, which is difficult to be treated efficiently. In this work, the composite modified Bentonite (CPAB/EGIS/B) was prepared by using ester-containing gemini imidazolium surfactant (EGIS) and cationic polyacrylamide (CPAB) as modifiers, CPAB/B and EGIS/B were also prepared. The samples were characterized by XRD , EA , FT-IR, SEM, and N 2 Physical adsorption and desorption, the changes of composition and structure of modified bentonite were studied. The adsorption performance of samples was tested by BPA, which shows that CPAB/EGIS/B has the strongest adsorption capacity for BPA solution. Under the conditions of initial pH, at 30 °C, the best adsorption effect was obtained when the dosage of the composite was 2.5 g/L for 180 min, the theoretical maximum adsorption capacity was 119.88 mg/g. CPAB and EGIS formed a more affinity organic micro-environment between bentonite layers and establish a nice structure-activity relationship with BPA. The adsorption of BPA onto CPAB/EGIS/B matched well with the pseudo-second-order model. The obtained isotherms data were described well by the Langmuir model and the adsorption is a spontaneous exothermic process.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Geomechanics and Geophysics for Geo-Energy and Geo-Resources
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2023
·Vol. 9
·期 1
·1-13
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IF 5
Fengxiao Wang,Jinzhang Jia,Xiuyuan Tian
Methane explosions threaten the safety of industrial security in modern society. To suppress such explosions, experiments were made through using different masses of bentonite power driven by CO 2 within a pipe network set up in an independent way. The three factors, including the peak over-pressure of an explosion, the index of the explosion power, and the time length within which the first wave of flames reached the pipe network’s outlet, were measured to evaluate the performance. Moreover, an analysis on the mechanism of suppressing explosions was also conducted. According to the results, a gradual increase of the powder mass from 20 to 50 g could promote the effect of explosion suppression, but a further increase from50 g to 60 g only led to a slight improvement of the performance. Thus, it was concluded that the use of 50 g of bentonite powder worked best for the suppression of methane explosions when environmental conservation, energy saving as well as practicality were all taken into consideration. What was found in this study is supposed to shed theoretical light on how to transport methane safely with disaster risks reduced effectively.
研究领域:
安全工程
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能源科学
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产品关联
DOI
高影响因子
Separations
·
2023
·Vol. 10
·期 10
·523
·
IF 2.6
Xiangfen Cui,Jingmei Liao,Huaying Liu,Wei Tang,Cheng Tie,Senlin Tian,Yingjie Li
The presence of organic pollutants in wastewater remains a prominent environmental concern due to the related ecological and health hazards. In response, this study employs an adsorptive methodology to address the removal of phenol and catechol, utilizing an organo-bentonite material modified with a pH-responsive switchable surfactant, dodecyldimethylamine oxide (C12DAO). The synthesized organo-bentonite (C12DAO-Bt) manifests commendable thermostability resulting from thermogravimetric analyses. The adsorption capacities of C12DAO-Bt concerning phenol and catechol intensify with the augmentation of the C12DAO/bentonite mass ratio. The utmost adsorption capacities of 150C12DAO-Bt, deduced through a pseudo-second-order kinetic model, stand at 5.72 mg·g−1for phenol and 5.55 mg·g−1for catechol, respectively. Subject to modification by a pH-responsive surfactant, conditions leaning towards weakly acidic and neutral conditions (pH = 6~7) are conducive to the adsorption of phenolic compounds. Conversely, alkaline conditions (pH = 8~9) facilitate the dissociation of adsorbates from adsorbents. The augmentation of cationic strength within the examined scope incites the adsorption procedure while impeding the desorption efficacy. In the case of cationic species with comparable ionic strengths, Na+exhibited a superior effect on the adsorption–desorption dynamics of phenol, while Ca2+exerts a more pronounced effect on those of catechol. Moreover, even following five consecutive acid–base regulation cycles, C12DAO-Bt retains a relatively high adsorption capacity and desorption efficacy, which underscores its exceptional regenerative capacity for removing phenolic compounds from wastewater.Keywords:pH-responsive surfactants;organic bentonite;reversible adsorption;phenolic pollutants;wastewater
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·
IF 5.8
Shen Qiang,Wu Tao,Zhang Guo-Bang,Ma Hao-En,Wang Wei,Pan Guo-Xiang,Zhang Yi-Fan
Heavy metal ions that exist in groundwater and farmland jeopardize the ecological environment and are very difficult to remove because of the complicated actual environment. Raw bentonite–gelatin beads (RB-GT) and magnetic bentonite–gelatin beads (MB-GT) synthesized in this work would be an appropriate tool to solve this problem. Those beads are synthesized by a facile hybrid injection method. Their adsorption behaviors on Cu(II) ions were systematically investigated using the batch adsorption method. The beads were characterized by scan electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectra (FTIR), and X-ray photoelectron spectroscopy (XPS). The adsorption isotherm and adsorption kinetic study showed that the Cu 2+ adsorption by MB-GT beads fitted the Langmuir model and the pseudo-second model. The adsorption maximum capacities reached 192.5 mg/g and 236.5 mg/g with Cu concentration of 1000 mg/L for RB-GT and MB-GT beads, respectively. The competitive adsorption with other heavy metal ions (Ni(II), Pd(II) and Cd(II)) were compared. The adsorption of Cu(II) mechanisms is also further discussed. Graphical Abstract
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产品关联
DOI
PubMed
高影响因子
Food Packaging and Shelf Life
·
2024
·
IF 8.5
Mengya Sun,Na Liu,Shuzhen Ni,Qinghua Xu,Hailong Gao,Hongqi Dai,Yingjuan Fu,Menghua Qin
The application of chitosan (CS) film in active food packaging fields is greatly limited by their poor strength , antioxidant and barrier properties. Two nanoparticles , lignosulfonate (SLS) and bentonite (BT), were used together to enhance the food packaging properties of CS composite films in this work. A dense and robust multifunctional bio-based nanocomposite film with a pearl-like structure was successfully prepared. Results indicated that the introduction of SLS substantially better the strength, antioxidant, and UV-shielding capacities of CS composite film. The maximum tensile strength of the obtained nanocomposite film (SLS/BT/CS) reached 1.9 times of pure CS film. The SLS gave the composite film an excellent UV-shielding property (between 6.18–0.14% (T UVA ) and 0.32–0.06% (T UVB ) at 10–40 wt% SLS). The total phenolic hydroxyl group content of the composite film was significantly increased after adding SLS, and the DPPH· scavenging ability of SLS/BT/CS film was 5 times better than that of BT/CS film. The addition of BT bent the water vapor transport path in the film and created a hydrophobic surface , which in turn led to a significantly better water vapor barrier performance of SLS/BT/CS than pure CS films. The results of this work showed the great application potential of SLS/BT/CS nanocomposite film in the food packaging fields.
研究领域:
食品科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
FERROELECTRICS
·
2022
·
IF 0.695
Qiang Shen,Songyuan Mao,Yubin Zhou,Yuheng Xie,Peisong Tang
Fe3+ modified bentonite was firstly prepared by ion change method and Fe2+ modified bentonite was then synthesized by reduction of Fe3+-bentonite. The modified bentonites were characterized with XRD and SEM. The adsorption ability of Tetracycline (TC) of Fe3+-bentonite and Fe2+-bentonite was compared with raw bentonite. The catalytic activity of two Fe-bentonites used as heterogeneous Fenton catalyst are also examined. The resulted shows that both of Fe3+-bentonite and Fe2+-bentonite exhibited superior removal performance of TC. The removal capacities of Fe3+-bentonite and Fe2+-bentonite in the 400 mg/L TC solution reached 98.15% and 96.55%, respectively. The Fe3+-bentonite and Fe2+-bentonite remains 75% removal abilities after 3 rounds under Fenton condition. The mechanisms of adsorption and Fenton degradation of Fe modified bentonite were also discussed.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Zhaoxin Huang,Xiaoyuan Qiu,Dandan Chen,Xiaolong Wu,Shasha Zhang,Pengfei Zhu
A novel Ag 2 CO 3 /ZnFe 2 O 4 /bentonite composite photocatalyst with a Z-type heterojunction was prepared using a solvothermal-in situ precipitation method. Under optimal conditions, with a mass ratio of ZnFe 2 O 4 to bentonite at 1:1.5 and a mass ratio of Ag 2 CO 3 to ZnFe 2 O 4 /bentonite at 1:3, the removal rate of norfloxacin (NOR) solution at 30 mg/L by Ag 2 CO 3 /ZnFe 2 O 4 /bentonite under visible light irradiation was found to be as high as 94.40% At the same time, the photocatalyst has good universality and reuse stability. The experimental results of photocatalyst characterization and mechanism exploration demonstrate that the photocatalytic activity of Ag 2 CO 3 /ZnFe 2 O 4 /bentonite is significantly enhanced, which can be attributed to the effective separation of electron-hole pairs, improvement in visible light absorption capacity, and enhancement of adsorption properties. The radical capture experiments revealed that h + played a pivotal role in the photocatalytic degradation of NOR by Ag 2 CO 3 /ZnFe 2 O 4 /bentonite, while ·O 2 − and ·OH acted as secondary factors. Ultimately, a Z-type heterojunction electron transfer mechanism was proposed. This study proposes the Ag 2 CO 3 /ZnFe 2 O 4 /bentonite photocatalysts with excellent stability for the treatment of NOR.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）