Preparation of Reusable Porous Carbon Nanofibers from Oxidized Coal Liquefaction Residue for Efficient Adsorption in Water Treatment

Abstract

Porous carbon nanofibers are commonly used for adsorption processes owing to their high specific surface area and rich pore structure. However, the poor mechanical properties of polyacrylonitrile (PAN)-based porous carbon nanofibers have limited their applications. Herein, we introduced solid waste-derived oxidized coal liquefaction residue (OCLR) into PAN-based nanofibers to obtain activated reinforced porous carbon nanofibers (ARCNF) with enhanced mechanical properties and regeneration for efficient adsorption of organic dyes in wastewater. This study examined the effects of contact time, concentration, temperature, pH, and salinity on the adsorption capacity. The adsorption processes of the dyes in ARCNF are appropriately described by the pseudo-second-order kinetic model. The maximum adsorption capacity for malachite green (MG) on ARCNF is 2712.84 mg g−1 according to the fitted parameters of the Langmuir model. Adsorption thermodynamics indicated that the adsorptions of the five dyes are spontaneous and endothermic processes. In addition, ARCNF have good regenerative performance, and the adsorption capacity of MG is still higher than 76% after 5 adsorption-desorption cycles. Our prepared ARCNF can efficiently adsorb organic dyes in wastewater, reducing the pollution to the environment and providing a new idea for solid waste recycling and water treatment.

Hydrothermal Pretreatment of KOH for the Preparation of PAC and Its Adsorption on TC

“…From the kinetic analysis, it is clear that the PSO model fits the adsorption data more closely, so chemisorption occupies a pivotal position in the whole adsorption process. From the FTIR spectrogram, it can be seen that the PAC surface is rich in functional groups, including oxygen-containing [47] and hydroxyl groups, which can form robust hydrogen bonds with the amine group, phenol, and alkenone moieties of tetracycline [48]. Furthermore, activated carbon possesses C=C bonds, with one of the carriers of π-πEDA interactions being the carbon-carbon double bond [49].…”

An environment friendly multifunctional ZnO/wood fiber composite for the treatment of wastewater mixed with emulsions and dye

“…The primary approaches to the dye problem include adsorption and photocatalytic degradation. 7,8 Activated carbon, 9 resin, 10 clay minerals, 11 and coal 12 are commonly employed as adsorbents, although their effectiveness in emulsion separation is limited. Meanwhile, TiO 2 , ZnO, and g-C 3 N 4 are frequently used as photocatalysts.…”

A Recent Review of Electrospun Porous Carbon Nanofiber Mats for Energy Storage and Generation Applications

“…However, there are also controversial and differing hypotheses regarding their properties and areas of application. Despite this growing interest, however, there is a lack of comprehensive reviews that systematically summarize the various aspects and applications of these materials [8][9][10].…”