Ecological disasters and economic losses resulting from oil spills have reminded us the necessity for
finding an environmentally friendly, cost-effective, and available in large-scale materials to minimize the oil spill
effects. The development of high oil/water selectivity mineral sorbent for the removal of oil from the water
is of great interest for oil spill cleanup. In this work, highly oil/water selectivity sorbent of expanded perlite
modified with stearic acid was prepared by solution-immersion processes, and the characterization of sorbent was
analyzed by Fourier transformation infrared (FT-IR) spectroscopy technique. The optimized amount of loaded
stearic acid (SA) on the expanded perlite surface was found to be 2.0%. Then the sorption characteristics of
unmodified expanded perlite (UMEP) and stearic acid modified expanded perlite (SMEP) were tested. The
effects of different particles size, oil/water volume ratio and sorption simulated condition were investigated. It
was found that expanded perlite modified with stearic acid could adsorb selectively oil from water in oil/water
system. The maximum oil/water sorption ratio of SMEP was 46, which was about 191 times that of UMEP (0.24)
in studied experimental range. The FT-IR analysis demonstrated the presence of long-chain alkyl group in the
SMEP samples, which played an important role in oil/water selectivity of SMEP samples. The equilibrium were
tested with Langmuir and Freundlich isotherm models, and oil sorption process of SMEP showed good correlation
with the Langmuir isotherm model.
QI Pei-shi* (祁佩时), LIN Na (林 娜), LIU Yun-zhi (刘云芝), ZHAO Jun-jie (赵俊杰)
. Improvement of Oil/Water Selectivity by Stearic Acid Modified Expanded Perlite for Oil Spill Cleanup[J]. Journal of Shanghai Jiaotong University(Science), 2013
, 18(4)
: 500
-507
.
DOI: 10.1007/s12204-013-1426-x
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