Activated carbon from coal tar pitch and furfural for the removal of p-nitrophenol and m-aminophenol

Abstract

Adsorption of m-aminophenol and p-nitrophenol from aqueous solution on activated carbon synthesized on the base of industrial by product (coal tar pitch) and furfural was investigated.The adsorption capacity of the activated carbon and its oxidized modification is related to the surface area and composition of the prepared materials, as well as to the nature of the adsorbents. Despite the moderate porosity, the prepared materials display adequate adsorption capacity towards the investigated aromatic compounds. Both adsorbates show higher affinity towards the hydrophobic carbon, confirming that the retention mechanism occurs via nonspecific interactions between the electronic density of the adsorbent and the aromatic pollutants. Electrostatic interactions may also appear depending on the solution pH and the charge distribution of the carbons; we have observed that this parameter has a strong influence on the final performance of the oxidized carbon, where repulsive interactions that reduced the uptake of the carbon were found to appear within a larger pH range.

Adsorbent ability of lignin-based activated carbons for the removal of p-nitrophenol from aqueous solutions

“…Many different types of adsorbent may be evaluated to remove substituted phenols from wastewaters. They include, among others, XAD polymeric resins [1] and activated carbons, which still are the adsorbents widest used to this end [2][3][4][5][6][7][8][9][10][11][12]. On the other hand, as we have reported in previous works [13,14], the preparation of activated carbons from kraft lignin is an interesting possibility for the lignin benefit as an alternative way for the black liquors from the cellulose pulp industry, as they are usually processed.…”

A study on the preparation of pitch-based high-strength columnar activated carbon and mechanism of phenol adsorption from aqueous solution

“…The surface of the activated carbon is a uniform adsorbed surface composed of the same adsorption sites. 25 Freundlich model does not have a good t for isothermal adsorption. It indicates that the adsorption sites of this activated carbon are similar rather than nonuniform.…”

“…It can explain the existence of external diffusion process that the tting curve does not go through the origin. 25 Phenol adsorption of activated carbon can be described as: external diffusion through boundary, internal diffusion through pores and channels, adsorbed by the adsorption sites. Fig.…”

“…Different functional groups were calculated based on the consumption of acid or base. 25 The surface charge on activated carbon F900-1-100 in solution with different pH was determined by Zetasizer Nano-ZS (Nano particle size & Zeta potential analyser).…”

The application of activated carbon for the treatment and reuse of the aqueous phase derived from the hydrothermal liquefaction of a halophytic Tetraselmis sp.

“…Activated carbon has been used within various industries such as water purification, wastewater treatment, air filters, purification of gases and medical uses (Apul et al, 2013;Kovalova et al, 2013). One application that is relevant to the AP is the use of activated carbon to remove organic contaminants (Apul et al, 2013;Petrova et al, 2011).…”