Activated Carbon Fibers Research Articles

Synergistic Degradation of Methylene Blue by Laser Cavitation and Activated Carbon Fiber

Synergistic Degradation of Methylene Blue by Laser Cavitation and Activated Carbon Fiber

Validation Of a Sorbent Based on Activated Carbon Fibers (Acf) for the Simultaneous Sampling of Gaseous and Particle-Bound Pcdd/Fs and Pcbs

Validation Of a Sorbent Based on Activated Carbon Fibers (Acf) for the Simultaneous Sampling of Gaseous and Particle-Bound Pcdd/Fs and Pcbs

The effective removal of Pb2+ by activated carbon fibers modified by l-cysteine: exploration of kinetics, thermodynamics and mechanism.

Herein, we developed a low-cost fabrication route to prepare chemically grafted activated carbon fibers, which effectively removed Pb2+ from solution. Multiple characteristic results indicated that l-cyst-ACF had abundant nitrogen-containing and sulfur-containing functional groups. Based on the XPS and EDS analyses, the capture of Pb2+ was attributed to the abundant adsorption sites on the fiber surface. According to the analysis of the pseudo-second-order kinetic model and the Langmuir isotherm model, the adsorption process could be interpreted as monolayer adsorption and chemisorption, and the equilibrium adsorption capacity was determined to be 136.80 mg g−1 by fitting the pseudo-second-order kinetic model. The maximum adsorption capacity of l-cyst-ACF for Pb2+ was calculated to be 179.53 mg g−1 using the Langmuir model. In addition, the adsorption reaction was endothermic and spontaneous, as evidenced by the thermodynamic parameters. The outcomes of this study provide a low-cost and feasible strategy for the remediation of Pb2+ pollution in the environment.

Modeling and optimization of a honeycombed adsorbent bed for efficient moisture capture

Adsorption-based atmospheric water harvesting has received significant interest owing to its promise of decentralized water supply and a wide applicability. In this study, the adsorbent bed is specially designed and optimized for efficient moisture capture. A transient three-dimensional non-equilibrium model has been developed that takes both internal and external mass transfer resistances into account. It is found that the simulation results agree better with the experimental results, which indicates the reliability of the model. Then this model was applied to investigate the influence of the adsorbent bed structure, and the operating parameters on the transient distributions of the adsorbent temperature, adsorption kinetics, dynamic up-taken moisture capture, mass transfer resistance and relative capture efficiency of the adsorbent bed. ASLi30 (Activated carbon fiber + Silica gel + 30 wt% LiCl)-vapor is selected as the working pair. It has been found that generally, the effects of the air channel aspect ratio on the investigated indexes are negligibly small. A thinner layer thickness and a smaller air channel length characterize an excellent moisture capture, small vapor transport resistance and faster adsorption kinetics. By considering different parametric variations for performance optimization and the effect of operating conditions, these results provide important insights and design guidelines of adsorbent bed for efficient moisture capture.

Improved Capacitive Behavior of Birnessite Type Mn Oxide Coated on Activated Carbon Fibers

Birnessite type Mn oxide (potassium birnessite hydrate) powder (as-δ-MnO2) with a layered microstructure was prepared via a hydrothermal process. To improve its capacitive performance, the microstructure was thermally modified (annealed) at 400 °C (400-δ-MnO2) in a N2 reducing environment. By removing the hydrated cation (K+) layers inserted between the main layers of birnessite, intercalation/deintercalation of the electrolyte species (Li+1) became more effective. Characterization of the as-δ-MnO2 and 400-δ-MnO2 samples revealed that no phase transformation occurred during the annealing process. The microstructure became less crystalline and the total pore volume increased from 0.20 cm3 g−1 to 0.43 cm3 g−1, while the oxidation state of Mn remained 4+ after annealing the as-δ-MnO2 sample at 400 °C. The 400-δ-MnO2 sample was then coated on asphaltene derived activated carbon fibers (ACF-400-δ-MnO2) to improve the performance by making use of the high electrical conductivity and capacitive behavior of ACF. Coating the 400-δ-MnO2 sample led to a significant increase in the capacitance (328 F g−1 and 195 F g−1 for ACF-400-δ-MnO2 and 400-δ-MnO2 at 0.4 A g−1, respectively), improved energy and power values (∼7 kW kg−1 at ∼4.2 Wh kg−1 for ACF-400-δ-MnO2 and 240 W kg−1 at 2.4 Wh kg−1 for 400-δ-MnO2) and improved cycling behavior.

Electrochemical Properties of Iron Oxide Decorated Activated Carbon Cloth as a Binder-Free Flexible Electrode

The oxidation and deposition of transition metal oxides on porous carbon precursor materials strongly influence the final performance of supercapacitor electrodes. Thus, the influence of oxidation time combined with simple iron oxide deposition was evaluated on a flexible carbon fiber cloth electrode oxidized at three different times and exposed to spontaneous iron oxide deposition. The 140 minutes oxidation time increased by two times the iron quantity deposited on the activated carbon fiber cloth (ACC) and also increased the crystallinity of the carbon matrix. The iron oxide deposition improved the contribution of anions to store energy, enhancing the pseudocapacitive effect in the samples. The optimal oxidation time of the ACC140_Fe sample with the greater iron oxide deposition achieves 116.8 F g-1. The binder-free flexible electrode presents a successful design through pre-oxidation and spontaneous iron oxide deposition on the carbon matrix without expensive and environmentally unfriendly chemical treatments.

Facile Green Preparation of Single- and Two-Component Modified Activated Carbon Fibers for Efficient Trace Heavy Metals Removal from Drinking Water

Facile Green Preparation of Single- and Two-Component Modified Activated Carbon Fibers for Efficient Trace Heavy Metals Removal from Drinking Water

Fabrication and Heavy Metals Adsorption Performance of Viscose Based Activated Carbon Fibers

Fabrication and Heavy Metals Adsorption Performance of Viscose Based Activated Carbon Fibers

Enhanced Cl- Eletrosorption Performance of Activated Carbon Fiber Via Decoration of Tio2 and Pani

Enhanced Cl- Eletrosorption Performance of Activated Carbon Fiber Via Decoration of Tio2 and Pani

Fabrication and Heavy Metals Adsorption Performance of Viscose Based Activated Carbon Fibers

Fabrication and Heavy Metals Adsorption Performance of Viscose Based Activated Carbon Fibers

A scalable, ecofriendly, and cost-effective lithium metal protection layer from a Post-it note.

Although there have been many studies addressing the dendrite growth issue of lithium (Li)–metal batteries (LMBs), the Li–metal anode has not yet been implemented in today's rechargeable batteries. There is a need to accelerate the practical use of LMBs by considering their cost-effectiveness, ecofriendliness, and scalability. Herein, a cost-effective and uniform protection layer was developed by simple heat treatment of a Post-it note. The carbonized Post-it protection layer, which consisted of electrochemically active carbon fibers and electrochemically inert CaCO3 particles, significantly contributed to stable plating and stripping behaviors. The resulting protected Li anode exhibited excellent electrochemical performance: extremely low polarization during cycling (<40 mV at a current density of 1 mA cm−2) and long lifespan (5000 cycles at 10 mA cm−2) of the symmetric cell, as well as excellent rate performance at 2C (125 mA h g−1) and long cyclability (cycling retention of 62.6% after 200 cycles) of the LiFePO4‖Li full cell. The paper-derived Li protection layer offer a facile and scalable approach to enhance LMB electrochemical performance.

Flexible Phosphorus-Doped Activated Carbon Fiber Paper In-Situ Loading of Cuo for Degradation of Phenol

Flexible Phosphorus-Doped Activated Carbon Fiber Paper In-Situ Loading of Cuo for Degradation of Phenol

Coiled flow inverter mediated synthesis of activated carbon fiber-supported Ni nanoparticles

A single-stage continuous flow process for the synthesis of Ni nanoparticle-dispersed activated carbon fibers is developed using CFI technology.

Spider Silk-Derived Nanoporous Activated Carbon Fiber for Co2 Capture and Ch4 and H2 Storage

Spider Silk-Derived Nanoporous Activated Carbon Fiber for Co2 Capture and Ch4 and H2 Storage

Fabrication and Heavy Metals Adsorption Performance of Viscose Based Activated Carbon Fibers

Fabrication and Heavy Metals Adsorption Performance of Viscose Based Activated Carbon Fibers

Graphitic carbon nitride and carbon nanotubes modified active carbon fiber cathode with enhanced H2O2 production and recycle of Fe3+/Fe2+ for electro-Fenton treatment of landfill leachate concentrate

g-C3N4/CNTs/ACF with improved H2O2 production and Fe2+ regeneration showed an excellent performance in the treatment of landfill leachate concentrate.

Activated carbon fiber modified with hyperbranched polyethylenimine and phytic acid for the effective adsorption and separation of In(iii)

The PA–HPEI–OACF constructed with PA, HPEI, and ACF displays excellent performance in the adsorption and separation of In(iii).

Preparation of Activated Carbon Fibers (Acf) Impregnated with Silver Microparticles from Cotton-Woven Wastes and its Performance as an Antibacterial Agent

Preparation of Activated Carbon Fibers (Acf) Impregnated with Silver Microparticles from Cotton-Woven Wastes and its Performance as an Antibacterial Agent

Determination of activated carbon fiber adsorption capacity for several common organic vapors: applications for respiratory protection

ABSTRACT In the context of workplace safety, activated carbon in the fiber form (i.e., activated carbon fiber, ACF) represents an alternative adsorbent to granular activated carbon (GAC) for use in organic vapor respiratory protection devices. ACFs are high surface area carbonaceous materials that are often available in a self-supporting non-woven form. The physical form of ACF suggests the potential for a filtration medium that is capable of supporting both organic vapor adsorption and particulate filtration. To study the application of these materials in respiratory protection devices, ACFs (ACFF 1200 m2/g, ACFF 1800 m2/g, and ACFF 2000 m2/g) were challenged with representative organic vapors (toluene, hexane, and methyl ethyl ketone (MEK)) at an occupationally relevant concentration (200 ppm). Breakthrough curves were generated for at least three different bed weights of adsorbent. Pressure drop (i.e., the resistance across the filtration media) was also measured to determine maximum ACF bed depths for use in respiratory protection devices. Breakthrough experiments indicate that ACFF 2000 has the highest adsorption capacity for toluene (381 mg/g), followed by ACFF 1800 and ACFF 1200 (344 mg/g and 239 mg/g, respectively). A similar trend was observed for hexane: 221 mg/g, 196 mg/g, and 146 mg/g for ACFF 2000, ACFF 1800, and ACFF 1200, respectively. ACFF 1200 showed the highest adsorption capacity for the polar adsorbate MEK (168 mg/g), followed by ACFF 1800 and ACFF 2000 (166 mg/g and 147 mg/g, respectively). Based on the constraints of pressure drop, it seems unlikely the exclusive use of ACF in a filtering facepiece respirator can provide an adsorbent mass sufficient for full shift protection against organic vapor contaminants at or above the legally enforceable permissible exposure level (PEL). Nevertheless, the incorporation of ACF into a facepiece respirator appears promising for “nuisance odor” applications; i.e., the further reduction of organic vapor concentrations when workplace exposures are already below PEL concentrations. Implications: This research brings innovation to the field of occupational health and air pollution control technology by investigating the adsorption performance of activated carbon fiber (ACF) media in the context of worker respiratory protection. ACF properties such as high specific surface area (m2/g), high permeability to airflow, and rapid adsorption kinetics make it ideal for use in thin, N95-style respirators for organic vapors. Respiratory protection is an exciting and relevant application for ACF media. A lightweight adsorbent such as ACF, if incorporated into an N95-style respirator, could potentially provide nuisance-level VOC protection in a physical form that is accessible to workers and consistent with OSHA’s voluntary use provisions for facepiece respirators. The research presented in this manuscript represents one of several steps planned in the characterization of ACF media for this particular application.

Functionalized Activated Carbon Fibers by Hydrogen Peroxide and Polydopamine for Efficient Trace Lead Removal from Drinking Water.

To achieve efficient and selective trace heavy metals removal from drinking water, a low-cost purification material polydopamine/activated carbon fibers (PDA/H-ACF) was successfully prepared by polymerizing dopamine on the surface of activated carbon fibers pretreated with hydrogen peroxide. The morphology, phase, surface functional groups, specific surface, and pore size distribution of the as-prepared sample were analyzed using FESEM, XPS, BET and pore size distribution test (PST), and FTIR, and orthogonal experiments were used to investigate the influences of concentration of H2O2, pretreatment time, and reflux temperature on trace lead removal. The results showed that the sample pretreated under optimized conditions could produce different pore structures, and the content of functional group -COOH obviously increased. After further modification by polydopamine, the contents of -NH-, -NH2, and -OH functional groups on the surface obviously enhanced, which were beneficial to increase adsorption site and promote trace lead removal. The effluent lead concentration decreased from initial 150 to 3.18 ppb within 5 min, meeting the requirement of NSF International Standard/American National Standard for Drinking Water Treatment Units (NSF/ANSI 53-2020) (5 ppb). The isothermal adsorption process and adsorption kinetics could be well-fitted by the Langmuir isotherm and pseudo-second-order kinetics model, indicating that the adsorption process of trace lead by PDA/H-ACF belonged to monolayer and chemical adsorption. Moreover, the as-prepared PDA/H-ACF also showed superior trace lead adsorption performance in the presence of high concentration competitive metal ions, in a wide pH range and in tap water, and therefore had good application prospect in the field of drinking water purification.