Phosphate ion adsorption properties of PAN-based activated carbon fibers prepared with K2CO3 activation

Abstract

Adsorbents for phosphate ion removal were prepared with K 2 CO 3 activation and heat treatment at 950 °C from polyacrylonitrile-based carbon fiber (PAN-CF). Comparative tests for specific surface area and pore structures, elemental and nitrogen species analysis, and phosphate ion adsorption experiments demonstrated that K(3)-Δ, which was activated with K 2 CO 3 /PAN-CF weight ratio of 3 and then treated at 950 °C, exhibited larger amount of quaternized-nitrogen (0.46 wt%) and equilibrium adsorption amount (0.23 mmol/g) among the prepared adsorbents. The experimental data for phosphate adsorption of K(3)-Δ was well fitted to Langmuir adsorption isotherms and pseudo-second-order kinetic model. As for regeneration performance, K(3)-Δ still remained more than 60% adsorption amount of the fresh adsorbent after rejuvenation treatment.

Phosphates Ion Adsorption Characteristics of Activated Carbon Fibers Modified with <i>N</i>¹-(2-aminoethyl)-1,2-ethenediamine

“…The aim of KF oxidation was to obtain the maximum amount of carboxyl groups through oxidation of the KF surface. KF and 30% w/w hydrogen peroxide solution in the ratio of 1 g to 20 mL were added into an Erlenmeyer flask and shaken at 100 rpm for 2 h. Then, the sample was vacuum Co., Ltd., UV-2550) 6) . The equilibrium adsorption amount of phosphates ions Q e was calculated by the following equation,…”

“…Therefore, there is an urgent need to develop effective phosphorus removal and recovery methods. Various methods of phosphates ion removal have been studied, including sedimentation with coagulation 4) , biological dephosphorization 5) , and adsorption 6) . However, the coagulation sedimentation method is costly, and the biological dephosphorization method is difficult to obtain stable treatment efficiency and also a large amount of sludge is generated after treatment 7) .…”

Optimization of Phosphate Oxygen Isotope Pretreatment Measurement Method Based on Hosphate In-situ Enrichment Blanket

“…A sample (10 g) of each phosphate-enrichment material was weighed into a 100-mL conical ask, and 100 mL of phosphate solution (10,30,50,100,150,200,250, or 300 mg•L −1 ) was added. After shaking at 25°C for 24 h (150r/min), the concentration of phosphorus (C in Eq.…”

Characteristics of phosphate ion adsorption by nitrogen-doped carbon-based adsorbents prepared from sucrose, melamine, and urea

“…Therefore, there is an urgent need to develop effective phosphorus removal and recovery methods. Various methods of phosphate ion removal have been investigated, including coagulation sedimentation [9], biological dephosphatization [10], and adsorption [11][12][13]. However, the coagulation sedimentation method is costly [9], while the biological dephosphatization method is difficult to achieve stable treatment efficiency and generates a large amount of sludge after treatment [10].…”