Microbial Targeted Degradation Pretreatment: A Novel Approach to Preparation of Activated Carbon with Specific Hierarchical Porous Structures, High Surface Areas, and Satisfactory Toluene Adsorption Performance

2019 ◽  
Vol 53 (13) ◽  
pp. 7632-7640 ◽  
Author(s):  
Weixia Zhang ◽  
Hairong Cheng ◽  
Qi Niu ◽  
Mingli Fu ◽  
Haomin Huang ◽  
...  
Keyword(s):  
Activated Carbon ◽  
High Surface ◽  
Porous Structures ◽  
Adsorption Performance ◽  
Surface Areas ◽  
Novel Approach ◽  
Hierarchical Porous

Facile fabrication of 3D ferrous ion crosslinked graphene oxide hydrogel membranes for excellent water purification

2019 ◽  
Vol 6 (10) ◽  
pp. 3060-3071 ◽  
Author(s):  
Zhangjingzhi Chen ◽  
Jun Wang ◽  
Xiaoguang Duan ◽  
Yuanyuan Chu ◽  
Xiaoyao Tan ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Water Purification ◽  
High Surface ◽  
Ferrous Ion ◽  
Porous Structures ◽  
Water Pollutants ◽  
3D Graphene ◽  
Surface Areas ◽  
Hydrogel Membranes ◽  
Facile Fabrication

3D graphene-based macrostructures have been recognized as promising candidates for adsorption and separation of water pollutants due to their well-defined porous structures and high surface areas.

scholarly journals Effects of Crystallinity on the Photocatalytic Polymerization of 3,4-Ethylenedioxythiophene over CsPbBr3 Inverse Opals

Catalysts ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1331
Author(s):  
Siwei Zhao ◽  
Shaohua Jin ◽  
Huanmin Liu ◽  
Shengfu Li ◽  
Kun Chen
Keyword(s):  
Colloidal Crystal ◽  
Three Dimensional ◽  
Inverse Opal ◽  
Porous Structures ◽  
Novel Approach ◽  
Transmission Electron ◽  
Hierarchical Porous ◽  
Antisolvent Crystallization ◽  
Colloidal Crystal Templating ◽  
High Absorption Coefficient

Due to their high absorption coefficient and long carrier lifetime, halide perovskites are promising candidates for photocatalysts. For this study, the antisolvent crystallization protocol and the colloidal crystal templating approach were combined to fabricate the highly crystalline cesium lead bromide perovskite with inverse opal morphology (IO-CsPbBr3). Scanning electron microscopy and transmission electron microscope images demonstrate the three-dimensional well-ordered porous structures of the IO-CsPbBr3 and their single-crystalline features. The presented approach not only provides hierarchical porous structures but also enhances overall crystallinity. When used as catalysts to promote the polymerization of 2,2′,5′,2″-ter-3,4-ethylenedioxythiophene, the highly crystalline IO-CsPbBr3 exhibits a superior photocatalytic performance compared to its polycrystalline counterpart. Furthermore, the morphology and the crystalline structure of the highly crystalline IO-CsPbBr3 are well preserved under photocatalytic conditions. This novel approach enables the preparation of a halide perovskite inverse opal with high crystallinity.

Hierarchical porous microspheres of activated carbon with a high surface area from spores for electrochemical double-layer capacitors

2016 ◽  
Vol 4 (41) ◽  
pp. 15968-15979 ◽  
Author(s):  
Yiyi Jin ◽  
Kuan Tian ◽  
Lu Wei ◽  
Xingyan Zhang ◽  
Xin Guo
Keyword(s):  
Activated Carbon ◽  
Surface Area ◽  
Double Layer ◽  
Carbon Materials ◽  
High Surface ◽  
High Surface Area ◽  
Electrochemical Double Layer Capacitors ◽  
Hierarchical Porous ◽  
Electrochemical Double Layer ◽  
Double Layer Capacitors

3D activated carbon materials almost perfectly inherit the nano-architectures of spores, exhibiting excellent capacitance storage capability for EDLCs.

Hierarchical porous activated carbon in OER with high efficiency

RSC Advances ◽  
2016 ◽  
Vol 6 (104) ◽  
pp. 102422-102427 ◽  
Author(s):  
Yu-Tong Pi ◽  
Xiang-Ying Xing ◽  
Li-Ming Lu ◽  
Zhan-Bing He ◽  
Tie-Zhen Ren
Keyword(s):  
Activated Carbon ◽  
High Efficiency ◽  
Polarization Curves ◽  
Porous Structures ◽  
High Durability ◽  
Hierarchical Porous ◽  
Porous Activated Carbon

The corresponding OER potential of MAC is 1.596 V at 10 mA cm−2 mg−1. The MAC exhibits almost the same polarization curves after 1000 cycles. The high durability of MAC is ascribed to its hierarchical porous structures.

scholarly journals A Comparison of the Electrochemical Behavior of Carbon Aerogels and Activated Carbon Fiber Cloths

1996 ◽  
Vol 431 ◽  
Author(s):  
T. D. Tran ◽  
C. T. Alviso ◽  
S. S. Hulsey ◽  
J. K. Nielsen ◽  
R. W. Pekala
Keyword(s):  
Activated Carbon ◽  
Carbon Fiber ◽  
Electrochemical Behavior ◽  
High Surface ◽  
High Surface Area ◽  
Activated Carbon Fiber ◽  
Solid Matrix ◽  
Carbon Aerogels ◽  
Surface Areas ◽  
Cell Structures

AbstractThe electrochemical capacitative behavior of carbon aerogels and selected commercial carbon fiber cloths was studied in 5M potassium hydroxide, 3M sulfuric acid, and 0.5M tetraethylammonium tetrafluoroborate/propylene carbonate electrolytes. The resorcinolformaldehyde based carbon aerogels with a range of density (0.2–0.85 g/cc) have open-cell structures with ultrafine pore sizes (∼5–50 nm), high surface area (400–700 m2/g), and a solid matrix composed of interconnected particles or fibers with characteristic diameters of 10 nm. The commercial fiber cloths in the density range 0.2–0.4g/cc have high surface areas (1000–2500 m2/g). The volumetric capacitances of high-density aerogels are shown to be comparable to or exceeding those obtained from activated carbon fibers. The electrochemical behavior of these types of materials in various electrolytes is compared and related to their physical properties.

scholarly journals Fabrication of high surface area acid-treated activated carbon from pomegranate husk for 2,4-dichlorophenol adsorption

2021 ◽  
Author(s):  
Ensiyeh Taheri ◽  
Mohammad Mehdi Amin ◽  
Ali Fatehizadeh ◽  
Eder C. Lima
Keyword(s):  
Activated Carbon ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Xrd Analysis ◽  
Absorption Capacity ◽  
Surface Areas ◽  
Adsorption Condition ◽  
Pomegranate Husk ◽  
Increasing Temperature

Abstract In the present study, zinc chloride followed by acid treating was employed for fabrication activated carbon with a high surface area from pomegranate husk (APHAC) for 2,4-dichlorophenol (2,4-DCP) adsorption. The APHAC was a well-developed pore and exhibiting specific surface areas of 1576 m2/g. Based on the XRD analysis, the diffraction peaks between 15 ° and 35 ° corresponded to amorphous carbon, and the pHpzc values of APHAC was 6.15 ± 0.15. According to batch experiments, the optimum adsorption condition of 2,4-DCP was pH of 3, contact time 60 min, and APHAC dose of 1.75. The absorption capacity of 2,4-DCP at the APHAC dose of 0.5 promptly decreased from 259.5 ± 12.9 mg/g at the initial concentration of 150 mg/L to 74.5 ± 3.7 mg/g dose of 2 g/L. With increasing temperature from 10°C to 50°C, the adsorption efficiency declined from 99.8 ± 0.5% to 75.6 ± 1.89%. The isotherm and kinetic of 2,4-DCP by APHAC revealed that Freundlich and Elovich satisfactorily fitted with experimental data.

scholarly journals Template-assisted, Sol-gel Fabrication of Biocompatible, Hierarchically Porous Hydroxyapatite Scaffolds

Materials ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1274 ◽  
Author(s):  
Xingyuan Zhang ◽  
Lirong Zhang ◽  
Yuanwei Li ◽  
Youlu Hua ◽  
Yangde Li ◽  
...  
Keyword(s):  
High Surface ◽  
Sol Gel ◽  
High Surface Area ◽  
Culture Cell ◽  
Porous Structures ◽  
Porous Hydroxyapatite ◽  
Hierarchically Porous ◽  
In Vitro Biocompatibility ◽  
Hierarchical Porous

Hierarchically porous hydroxyapatite (HHA) scaffolds were synthesized by template-assisted sol-gel chemistry. Polyurethane foam and a block copolymer were used as templates for inducing hierarchically porous structures. The HHA scaffolds exhibited open porous structures with large pores of 400–600 µm and nanoscale pores of ~75 nm. In comparison with conventional hydroxyapatite (CHA), HHA scaffolds exhibited significantly higher surface areas and increased protein adsorption for bovine serum albumin and vitronectin. Both the HHA and CHA scaffolds exhibited well in vitro biocompatibility. After 1 day, Saos-2 osteoblast-like cells bound equally well to both HHA and CHA scaffolds, but after 7 days in culture, cell proliferation was significantly greater on the HHA scaffolds (p < 0.01). High surface area and hierarchical porous structure contributed to the selective enhancement of osteoblast proliferation on the HHA scaffolds.

scholarly journals Exploring hierarchical porous silica-supported Ag3PO4 as high-efficient and environmental-friendly photocatalytic disinfectant

2021 ◽  
Author(s):  
Pei Zheng ◽  
Bo Jin ◽  
Sheng Dai
Keyword(s):  
Visible Light ◽  
High Performance ◽  
High Surface ◽  
Porous Silica ◽  
Photo Oxidation ◽  
Surface Areas ◽  
Environmental Friendly ◽  
Hierarchical Porous ◽  
High Efficient ◽  
Silver Release

Abstract Silver orthophosphate (Ag3PO4) is an attractive photocatalytic catalyst for disinfection and degradation, but its instability arising from silver release generates significant environmental issue. Aiming to develop a highly efficient and environmental-friendly catalyst, we synthesized Ag3PO4 nanoparticle incorporated hierarchical porous silica (Ag3PO4@h-SiO2) as a novel high-performance photocatalytic catalyst without observed silver release. Brain-like hierarchical porous SiO2 (h-SiO2) brings a scaffold support with high surface areas, and the h-SiO2 surface modified thiols are able to anchor in situ formed 10 nm Ag3PO4 to eliminate silver release. Systematic investigations revealed that because of its structural advantages, Ag3PO4@h-SiO2 show excellent disinfection and degradation ability under visible-light irradiation and stable characteristics without obviously observed silver leaching during photo-oxidation operation. In-depth scavenger study reveals Ag3PO4@h-SiO2 as an effective semiconducting photocatalyst stimulates the production of photo-generated reactive species, which dominate its distinguished disinfection performance via photo-oxidation. Graphical abstract Ag3PO4 are anchored to thiol modified hierarchical porous SiO2 to produce a visible-light responsive photocatalyst of Ag3PO4@h-SiO2. The enhanced catalytic sites and surface areas promote pathogen disinfection, and the structure advantages minimize silver release to environment. Both H2O2 and holes being generated in photocatalysis dominate overall disinfection activity.

scholarly journals Block copolymer–based porous carbon fibers

2019 ◽  
Vol 5 (2) ◽  
pp. eaau6852 ◽  
Author(s):  
Zhengping Zhou ◽  
Tianyu Liu ◽  
Assad U. Khan ◽  
Guoliang Liu
Keyword(s):  
Activated Carbon ◽  
Block Copolymer ◽  
Carbon Fibers ◽  
Porous Carbon ◽  
Microphase Separation ◽  
High Surface ◽  
Electrochemical Energy Storage ◽  
Interconnected Network ◽  
Surface Areas ◽  
Poly Acrylonitrile

Carbon fibers have high surface areas and rich functionalities for interacting with ions, molecules, and particles. However, the control over their porosity remains challenging. Conventional syntheses rely on blending polyacrylonitrile with sacrificial additives, which macrophase-separate and result in poorly controlled pores after pyrolysis. Here, we use block copolymer microphase separation, a fundamentally disparate approach to synthesizing porous carbon fibers (PCFs) with well-controlled mesopores (~10 nm) and micropores (~0.5 nm). Without infiltrating any carbon precursors or dopants, poly(acrylonitrile-block-methyl methacrylate) is directly converted to nitrogen and oxygen dual-doped PCFs. Owing to the interconnected network and the highly optimal bimodal pores, PCFs exhibit substantially reduced ion transport resistance and an ultrahigh capacitance of 66 μF cm−2 (6.6 times that of activated carbon). The approach of using block copolymer precursors revolutionizes the synthesis of PCFs. The advanced electrochemical properties signify that PCFs represent a new platform material for electrochemical energy storage.

scholarly journals Activated Carbons from Fast Pyrolysis Biochar as Novel Catalysts for the Post-Treatment of Pyrolysis Vapors, Studied by Analytical Pyrolysis

2020 ◽  
Vol 6 (4) ◽  
pp. 65
Author(s):  
Taina Ohra-aho ◽  
Christian Lindfors ◽  
Juha Lehtonen ◽  
Tarja Tamminen ◽  
Virpi Siipola
Keyword(s):  
Activated Carbon ◽  
Active Sites ◽  
Activated Carbons ◽  
Degradation Products ◽  
High Surface ◽  
Fast Pyrolysis ◽  
Post Treatment ◽  
Mineral Contents ◽  
Surface Areas ◽  
Carbon Catalysts

Biochars are attractive materials for carbon catalysts since their carbon content and surface area are relatively high and minerals present in biochar can act as active sites for catalytic reactions. In this study, biochars from the fast pyrolysis of birch, pine, and unbarked willow were activated and acid washed. These materials were tested as catalysts for a post-treatment of pine wood pyrolysis vapors, aiming at stabilizing the vapors before their condensation. All the unmodified biochars had high content of minerals, those being highest in willow due to the bark. After the activation treatments, the surface areas and pore volumes of all biochars significantly increased. All studied biochars and activated carbon catalysts reduced the oxygen content of the pyrolysis degradation products. This effect was more pronounced for compounds derived from polysaccharides vs. lignin. The most promising catalyst for vapor upgrading was unwashed activated carbon from willow, having high surface areas and pore volumes together with high mineral contents. These properties together promoted the high conversion of polysaccharide-derived products (anhydrosugars, acids, and pyrans) into CO2. Release of highly oxidized degradation products may indicate that reductive stabilization takes place via hydrogen migration from the polysaccharide-derivatives to lignin derivatives, mediated by the carbon catalyst.

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