Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Dandan Ma,Zhonghan Cheng,Ye Yuan,Somboon Chaemchuen
The zeolitic-imidazole frameworks (ZIFs) have become popular due to their uniformly structured cavities and portals of framework dimensions, which make them suitable for numerous applications. In order to access pores and functional surfaces, thermal activation is significantly post-treatment on the synthesis of ZIFs for their applications. This study explores the impact of different thermal activation conditions on two- to three-dimensional ZIFs, which significantly affect their structure, morphology, and properties. Their transform structure is evidenced by integrated X-ray diffraction technique , Thermogravimetric analysis , Scanning electron microscope, and Fourier transform infrared spectroscopy . Moreover, the performance of greenhouse gas adsorption (CO 2 and CH 4 ) applications is affected by the transformation through the thermal activation of materials. Therefore, understanding the activated conditions that impact material synthesis is crucial to maximizing the potential applications of ZIFs in various fields. The 2D ZIF-L has more exposed external surfaces and open structures, which makes it more reactive towards adsorptive reactants, unlike the 3D ZIFs. The 3D ZIFs have a robust structure and a higher porosity framework that can withstand challenging application conditions. Thus, it's essential to ensure appropriate activation conditions to maintain the functional properties of ZIFs, which are crucial for their optimal performance in various applications.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
DRYING TECHNOLOGY
·
2020
·
IF 2.988
Wei Wang,Shuo Zhang,Yanqiu Pan,Yujia Tang,Guohua Chen
To explore the effect of wave-absorbing material aided microwave heating on freeze-drying of initially porous frozen material, a lab-scale microwave freeze-dryer was designed with solid-state source selected as the microwave source instead of the traditionally used magnetron. Vitamin C was employed as the solute in aqueous solution. “Soft-ice” freezing technique was adopted to prepare solid and porous frozen materials. Experimental results showed that the solid sample by soft-ice freezing can successfully avoid structural collapse during freeze-drying, and the porous frozen material can significantly intensify mass transfer of the freeze-drying process. Under the operating conditions of 35 °C and 20 Pa, the drying time of the porous sample with the initial saturation of 0.25 decreased by 30.4% compared with the solid one, and the residual moisture content of dried product decreased with the initial saturation reducing. SEM images of the dried products revealed that the porous material had a loose pore structure and a tenuous solid skeleton, which is favorable to the migration of sublimated/desorbed vapor and the desorption of bound moisture. Evidences also showed that appropriately increasing radiation temperature led to reducing the drying time, while changing chamber pressure had an insignificant effect on freeze-drying. With sintered silicon carbide (SiC), which is a kind of wave-absorbing material, as the supporting pad of sample, microwave heating can greatly improve heat transfer of the freeze-drying process. Under the same operating conditions, the drying time of the porous sample with the microwave input power of 5 W was 28.1% shorter than that of the same sample without microwave heating, and 50.0% shorter than that of the solid sample for conventional freeze-drying. Wave-absorbing material aided microwave freeze-drying of the porous material frozen with preformed pores is a feasible and effective way to achieve the simultaneous intensification of heat and mass transfer in freeze-drying.
研究领域:
食品科学与工程
·
化学工程
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Cuicui Guo,Yiling Wang,Yijing You,Mingjun Chen,Ka Zhang,Shengmiao Zhang
Many advanced materials are designed for the removal of heavy metal ions from water. However, materials for eliminating trace heavy metal ions from wastewater to meet drinking water standards remain a major challenge. Herein, epoxy group-functionalized open-cellular beads are synthesized by UV polymerization of a water-in-oil-in-water system. The epoxy groups are further transformed into diethylenetriaminepentaacetic acid (DTPA) with hexamethylene diamine as a bridging agent. The resulting material (DTPA@polyHIPE beads) can eliminate trace Cu(II), Cr(III), Pb(II), Fe(III), or Cd(II) from water. When 0.15 g of DTPA@polyHIPE beads are used to adsorb metal ions of 20 mg in 100 mL of water, the residue concentrations of Cu(II), Cr(III), Pb(II), Fe(III), and Cd(II) are reduced to 0.08, 0.06, 0.02, 0.09, and 0.07 mg/L, respectively. The adsorption efficiencies of the beads for these ions are all higher than 99.55%. The adsorbent is durable and exhibits good recyclability by retaining an adsorption capacity of ≥91% after 5 cycles. The negative values of ΔG in the adsorption process indicate that the adsorption is feasible and spontaneous. The chemical adsorption follows the Freundlich adsorption model, indicating a multilayer heterogeneous adsorption. The DTPA@polyHIPE beads have a great potential application in dealing with trace heavy metal ion polluted water.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
ENERGY
·
2022
·
IF 8.857
Bihe Yuan,Yunlong He,Xianfeng Chen,Qingquan Ding,Yi Tang,Yuduo Zhang,Yi Li,Qi Zhao,Chuyuan Huang,Quan Fang,Liancong Wang,Hang Jin
In the energy security field, porous materials are regarded as superb explosive attenuators that quench flames and dissipate explosion energy waves. Traditional porous materials based on polymer have been extensively explored for their flame and explosion-proof capabilities, but their applications are limited due to the lack of indispensable physical properties such as flame-retardant and antistatic properties. The polymer composites may contaminate the oil medium, as does the deterioration of their properties. By designing the material's structure and formula, a new three-dimensional mesh porous flame and explosion-proof material (TFEP) is developed through melt blending—extrusion spinning technology and material's explosion-proof performance will also be enhanced. This porous material integrates flame-retardant, antistatic, and oil-resistant performances. The TFEP's suppression effect on 9.5 vol% CH 4 /air premixed gas explosion was investigated under various filling conditions, and the optimal filling condition of TFEP was explored. Under these conditions, TFEP completely quenches the explosion flame, and the maximum explosion overpressure decay ratio for the upstream and downstream of the pipeline are 87.5% and 82.5%, respectively. TFEP eliminates the electrostatic risk generated by long-term friction of traditional polymer materials. It has moderate oil resistance and may be a candidate for explosion-proof materials in the fuel oil field.
研究领域:
能源安全
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
S. Jafari,A.R. Faraji,A. Gil,F. Ashouri
Valorizing single-use plastic waste as an effective activator in environmental protection has gained great interest from policymakers, legislators, and scientific research communities. Herein, low-cost and highly porous alkali Fe/Mn-doped carbon nanomaterials derived from polyethylene terephthalate (PET) waste (MF/ c PET- x ) were fabricated via facile pyrolysis and alkali-metal impregnation methods. Detailed characterizations of MF- c PET- x demonstrated that the ratio of alkaline impregnation and pyrolysis temperature affects the porous characteristics, content, and size of active sites, specific surface area, and yield of carbon residue/nanocomposite. The main aim of this study was to evaluate and optimize the MF/ c PET- x applied for the detoxification of various kinds of pharmaceutical drugs ( tetracycline , naproxen , paracetamol , and levofloxacin ) and various dyestuff in their single, binary, ternary, and quaternary solutions. The magnetic porous MF/ c PET-1 was found to show a most effective PMS activation for single/multiple toxic pollutants removal attaining levels >91.0 % in a wide range of temperatures (5–35 °C) and pH (3.0–9.0), without significant detectable metal leaching (>0.16 mg L −1 ). The outstanding catalytic performance in complex water environments was mainly attributed to the deposition of Mn/Fe nanoparticles with small grain size on a polymeric scaffold, bimetal synergistic effect, high specific surface area, high stability, and excellent anti-interference capability against coexisting substances. Physicochemical properties of the recycled composite, masking, and EPR analyses confirmed that the dominant reactive species in the following order: 1 O 2 > OH > SO 4 − > O 2 − . This work offers a new and straightforward approach for preparing porous alloy composite from plastic waste for pollutant degradation in various water matrices.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Wensha Niu,Zuoyi Xiao,Shifu Wang,Shangru Zhai,Longfei Qin,Zhenyu Zhao,Qingda An,Zhongcheng Li
Electrode materials with excellent capacitance performance remain on urgent need for energy storage devices. In this study, we successfully fabricated porous P-doped carbon-supported NiCoP nanoparticles (NiCoP@P–C) by chelating sodium alginate with Ni 2+ and Co 2+ ions and subsequently performing a high-temperature calcination process. The carbonization process involved phosphating the metal ions to form bimetallic NiCoP nanoparticles and doping the P element into the carbon framework. The as-prepared material integrated the merits of metal phosphide (high theoretical specific capacitance), bimetal (excellent electrochemical conductivity), and porous structure (rapid ion transportation). The sample consequently exhibited outstanding electrochemical properties with an ultrahigh specific capacitance of 920 F g −1 (0.5 A g −1 ) and a high cycle stability of 84% over 5000 cycles with a small mass loading of 3.6 mg cm −2 . Moreover, an asymmetric supercapacitor assembled with NiCoP@P–C-500 as the positive electrode and activated carbon as the negative electrode delivered a maximum energy density of 57.8 W h kg −1 at a power density of 522 W kg −1 .
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Xuyin Lin,Jinwen Jiang,Jun Wang,Jiaofen Lin,Aikebaier Reheman
ABSTRACT In this study, we used mesoporous silica materials as inorganic carrier and poly(o-phenylenediamine) with more active amino and imino groups as organic ligand to obtain functionalized adsorbent. The composite adsorbent poly(o-phenylenediamine) modified mesoporous composites (MPP) were prepared by loading poly(o-phenylenediamine) onto the surface of the aminated mesoporous material through in-situ polymerization. It was found that the maximum saturation adsorption capacity of MPP reached 225 mg/g when the solution pH, temperature, initial Hg(II) concentration, and adsorption time were 4, 298.15 K, 100 mg/L, and 240 min, respectively. When common interfering ions Zn(II), Ni(II), Cu(II), Ca(II), Mg(II) and Al(III) were present, the adsorption of Hg(II) by MPP still showed good selectivity. The adsorption of Hg(II) by MPP followed quasi-secondary kinetics and the Langmuir adsorption isotherm model, indicating that the adsorption process was chemisorption. In addition, MPP removed up to 81.35% of Hg(II) from industrial wastewater. After five cycles for adsorbent regeneration experiments, the adsorption capacity of MPP could reach 191.67 mg/g, indicating that the adsorbent has good regeneration performance and potential application value for removal of Hg(II).
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Xiaochen Zhang,Fengjun Deng,Ze Liu,Yingjian Yu
Si-air batteries have a high energy density, high theoretical voltage, and long lifetime, but they present a low anode utilization rate in a potassium hydroxide electrolyte. In this work, a ZIF-8 protective layer was prepared and modulated by a secondary growth method and then applied to protect the Si flat and Si nanowire (NW) anodes of a Si-air battery. By adjusting the conversion ratio, particle size, and crystallinity of ZIF-8 on the Si surface, the contact mode of the Si anode with water and OH – was controlled, thus achieving long-term corrosion and passivation resistance. Si NWs@ZIF-8 exhibited the highest average discharge voltage of 1.16 V, and the Si flat@ZIF-8 anode achieved the longest discharge time of 420 h. This work confirms that ZIF-8 acts as an anode protective layer to improve the properties of Si-air batteries and also provides valuable insights into the protection of Si anodes by MOFs.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2014
·
IF 1.61
Xiaoqian Wang,Kewei Wang,Jie Kong,Yiguang Wang,Linan An
In this paper, we reported a novel method for synthesis of non-oxide porous ceramics by using random copolymers as precursors. A silazane oligomer and styrene monomer were used as starting materials, which were copolymerized at 120 °C to form random polysilazane–polystyrene copolymers . The copolymers were then pyrolyzed at 500 °C to obtain porous ceramics by completely decomposing polystyrene (PS) and converting polysilazane (PSZ) into non-oxide Si–C–N ceramics. The obtained material contained a bi-model pore-structure consisting of both micro-sized and nano-sized pores with very high surface area of more than 500 m 2 /g. We also demonstrated that the pore structure and surface area of the materials can be tailored by changing the ratio of the two blocks. Current results suggest a promising simple method for making multi-scaled porous non-oxide materials.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 81
·77358-77365
·
IF 3.289
Ting-Ting Li,Jinjie Qian,Yue-Qing Zheng
Metal–organic frameworks (MOFs) have been demonstrated as suitable metal sources and sacrificial templates for the preparation of porous transition-metal oxide nanomaterials. Herein, porous CuO micro-polyhedra assembled from numerous nanoparticles are synthesized simply by employing a Cu-based MOF as a precursor via a one-step calcination process under an air atmosphere. Benefitting from their high porosity and large specific surface area, porous CuO materials exhibit excellent electrocatalytic performances toward water oxidation in pH 9.2 KBi solution. A low catalytic onset potential at 1.05 V vs. NHE (NHE = normal hydrogen electrode) is obtained based on electrochemical measurements. A faradaic efficiency of nearly 98% and a stable catalytic current density of 2.2 mA cm−2 are achieved under an applied potential of 1.30 V vs. NHE over an electrolysis period of 10 h. In addition, based on the Tafel plot, the required overpotentials are only ∼410 mV and ∼510 mV for achieving the catalytic current densities of 0.1 mA cm−2 and 1.0 mA cm−2, respectively. The excellent performances make it an appealing candidate as a potential catalyst for green energy applications.
研究领域:
材料化学
·
电化学
·
纳米材料
·
能源催化
·
无机功能材料
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Sha Wang,Zhenxia Zhao,Hui Xu,Yuanfu Deng,Zhong Li,Guohua Chen
A novel porous N-doped carbon microsphere (polymer-dopamine derived carbon, PDA-C) with high specific surface area was synthesized as sulfur host for high performance of lithium-sulfur batteries. We used KOH to adjust the pore size and surface area of the PDA-C materials, and then impregnated sulfur into the PDA-C samples by vapor-melting diffusion method. Effects of pore size of the PDA-C samples on the electrochemical performance of the PDA-C@sulfur cathodes were systematically investigated. Raman spectra indicated an enhanced trend of the degree of graphitization of the PDA-C samples with increasing calcination temperature. The surface area of the PDA-C samples increases with amount of the KOH in the pore-creating process. The graphitized porous N-doped carbon provides the high electronic conductive network. Meanwhile, the PDA-C with high surface area and uniform micropores ensures a high interaction toward sulfur as well as the high dispersion of nanoscale sulfur layer on it. The microporous PDA-C@S cathode material exhibits the excellent high rate discharge capability (636 mA h g −1 at 2.0 C) and good low/high-rate cycling stability (893 mA h g −1 (0.5 C) and 608 mA h g −1 (2.0 C) over 100 and 300 cycles). Cyclic voltammogram curves and electrochemical impedance plots show that both the impedance and polarization of the cells increase with decreasing pore size.
研究领域:
电化学
·
材料科学
·
能源存储
·
纳米材料
·
固态离子学
✓ 已验证
DOI
高影响因子
CELLULOSE
·
2023
·Vol. 30
·期 16
·10427-10436
·
IF 5.7
Wu Yuhang,Li Yuwen,Zheng Yanchun,Yao Juming,Gao Junkuo
Metal–organic frameworks (MOFs) have received widespread attention in recent years. However, the powder form of MOFs limits their large-scale applications. To facilitate the application of MOFs, mass production and shaped manufacturing of MOFs is significantly effective. Herein, a generic method based on a simple polymerization technique is proposed to prepare highly porous MOF–cellulose composite beads and the application of these composite beads in dye removal and recovery is displayed. Non-toxic solvent water and biodegradable sodium carboxymethylcellulose (CMC) were used as raw materials in the synthesis method. In addition to maintaining the crystallinity and porosity of the MOFs embedded in the cellulose matrix, the unique three-dimensional lamellar interconnected structure provides good mechanical properties for the composite beads. To demonstrate the practicality of these composite beads, a recycling processing system was built as a proof-of-concept device. MIL-100/CMC-HD can effectively degrade more than 95% of the dye and can be recycled multiple times. The superiority of the MOF–cellulose composite beads is highlighted by their ease of recycling and storage compared to MOF powder. Graphical abstract MOF/carboxymethylcellulose porous composite beads are synthesized in a simple one-step process. The lamellar interconnected structure not only facilitates the diffusion of contaminants in water but also provides good mechanical properties.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）