Enhanced adsorption of perfluorooctane sulfonate and perfluorooctanoate by bamboo-derived granular activated carbon.
A bamboo-derived granular activated carbon with large pores was successfully prepared by KOH activation, and used to remove perfluorooctane sulfonate (PFOS) and perfluorooctanoate (PFOA) from aqueous solution. The granular activated carbon prepared at the KOH/C mass ratio of 4 and activation temperature of 900°C had fast and high adsorption for PFOS and PFOA. Their adsorption equilibrium was achieved within 24h, which was attributed to their fast diffusion in the micron-sized pores of activated carbon. This granular activated carbon exhibited the maximum adsorbed amount of 2.32mmol/g for PFOS and 1.15mmol/g for PFOA at pH 5.0, much higher than other granular and powdered activated carbons reported. The activated carbon prepared under the severe activation condition contained many enlarged pores, favorable for the adsorption of PFOS and PFOA. In addition, the spent activated carbon was hardly regenerated in NaOH/NaCl solution, while the regeneration efficiency was significantly enhanced in hot water and methanol/ethanol solution, indicating that hydrophobic interaction was mainly responsible for the adsorption. The regeneration percent was up to 98% using 50% ethanol solution at 45°C.
State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, POPs Research Center, Tsinghua University, Beijing 100084, China; Collaborative Innovation Center for Regional Environmental Quality, Beijing 100084, China. Electronic address: dengshubo@tsinghua.edu.cn.
Shubo
S
Deng
State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, POPs Research Center, Tsinghua University, Beijing 100084, China.
Yao
Y
Nie
State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, POPs Research Center, Tsinghua University, Beijing 100084, China.
Ziwen
Z
Du
State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, POPs Research Center, Tsinghua University, Beijing 100084, China.
Qian
Q
Huang
State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, POPs Research Center, Tsinghua University, Beijing 100084, China.
Pingping
P
Meng
State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, POPs Research Center, Tsinghua University, Beijing 100084, China.
Bin
B
Wang
State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, POPs Research Center, Tsinghua University, Beijing 100084, China.
Jun
J
Huang
State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, POPs Research Center, Tsinghua University, Beijing 100084, China; Collaborative Innovation Center for Regional Environmental Quality, Beijing 100084, China.
Gang
G
Yu
D000327:Adsorption; D017738:Alkanesulfonic Acids / Q000032:analysis / Q000737:chemistry*; D031723:Bambusa / Q000648:ultrastructure; D002210:Caprylates / Q000032:analysis / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry*; D000431:Ethanol / Q000737:chemistry; D005466:Fluorocarbons / Q000032:analysis / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D000432:Methanol / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D059027:Recycling; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*
D017738:Alkanesulfonic Acids; D002210:Caprylates; D005466:Fluorocarbons; D014874:Water Pollutants, Chemical; D000431:Ethanol; D002244:Carbon; C023036:perfluorooctanoic acid; C076994:perfluorooctane sulfonic acid; D000432:Methanol
Adsorption capacity; Bamboo-derived activated carbon; PFOA; PFOS; Regeneration