Effect of rhamnolipid biosurfactant on solubilization of polycyclic aromatic hydrocarbons

Shudong Li; Yongrui Pi; Mutai Bao; Cong Zhang; Dongwei Zhao; Yiming Li; Peiyan Sun; Jinren Lu

doi:10.1016/j.marpolbul.2015.09.059

Effect of rhamnolipid biosurfactant on solubilization of polycyclic aromatic hydrocarbons

Mar Pollut Bull. 2015 Dec 15;101(1):219-225. doi: 10.1016/j.marpolbul.2015.09.059. Epub 2015 Oct 19.

Authors

Shudong Li¹, Yongrui Pi¹, Mutai Bao², Cong Zhang¹, Dongwei Zhao¹, Yiming Li¹, Peiyan Sun³, Jinren Lu⁴

Affiliations

¹ Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China; College of Chemistry & Chemical Engineering, Ocean University of China, Qingdao 266100, China.
² Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China; College of Chemistry & Chemical Engineering, Ocean University of China, Qingdao 266100, China. Electronic address: [email protected].
³ Key Laboratory of Marine Spill Oil Identification and Damage Assessment Technology, State Oceanic Administration, Qingdao 266033, China; North China Sea Environmental Monitoring Center of State Oceanic Administration, Qingdao 266033, China.
⁴ College of Chemistry & Chemical Engineering, Ocean University of China, Qingdao 266100, China.

PMID: 26494247
DOI: 10.1016/j.marpolbul.2015.09.059

Abstract

Rhamnolipid biosurfactant-producing bacteria, Bacillus Lz-2, was isolated from oil polluted water collected from Dongying Shengli oilfield, China. The factors that influence PAH solubilization such as biosurfactant concentration, pH, ionic strength and temperature were discussed. The results showed that the solubilities of naphthalene, phenanthrene and pyrene increased linearly with the rise of rhamnolipid biosurfactant dose above the biosurfactant critical micelle concentration (CMC). Furthermore, the molar solubilization ratio (MSR) values decreased in the following order: naphthalene>phenanthrene>pyrene. However, the solubility percentage increased and followed the opposite order: pyrene>phenanthrene>naphthalene. The solubilities of PAHs in rhamnolipid biosurfactant solution increased with the rise of pH and ionic strength, and reached the maximum values under the conditions of pH11 and NaCl concentration 8 g · L(-1). The solubility of phenanthrene and pyrene increased with the rise of temperature.

Keywords: Naphthalene; Phenanthrene; Polycyclic aromatic hydrocarbons (PAHs); Pyrene; Rhamnolipid biosurfactant; Solubilization.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Bacillus / isolation & purification
Bacillus / metabolism
China
Glycolipids / chemistry*
Micelles
Naphthalenes / analysis
Naphthalenes / chemistry
Osmolar Concentration
Petroleum Pollution / analysis
Phenanthrenes / analysis
Phenanthrenes / chemistry
Polycyclic Aromatic Hydrocarbons / analysis
Polycyclic Aromatic Hydrocarbons / chemistry*
Pyrenes / analysis
Pyrenes / chemistry
Solubility
Spectroscopy, Fourier Transform Infrared
Surface-Active Agents / chemistry*
Temperature
Water Microbiology
Water Pollutants, Chemical / analysis
Water Pollutants, Chemical / chemistry*

Substances

Glycolipids
Micelles
Naphthalenes
Phenanthrenes
Polycyclic Aromatic Hydrocarbons
Pyrenes
Surface-Active Agents
Water Pollutants, Chemical
rhamnolipid
naphthalene
phenanthrene
pyrene