Attachment of a Hydrophobically Modified Biopolymer at the Oil-Water Interface in the Treatment of Oil Spills

被引：89

作者：

Venkataraman, Pradeep ^{[1
]}

Tang, Jingjian ^{[1
]}

Frenkel, Etham ^{[1
]}

McPherson, Gary L. ^{[2
]}

He, Jibao ^{[3
]}

Raghavan, Srinivasa R. ^{[4
]}

Kolesnichenko, Vladimir ^{[5
]}

Bose, Arijit ^{[6
]}

John, Vijay T. ^{[1
]}

机构：

[1] Tulane Univ, Dept Chem & Biomol Engn, New Orleans, LA 70118 USA

[2] Tulane Univ, Dept Chem, New Orleans, LA 70118 USA

[3] Tulane Univ, Coordinated Instrumentat Facil, New Orleans, LA 70118 USA

[4] Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA

[5] Xavier Univ Louisiana, Dept Chem, New Orleans, LA 70125 USA

[6] Univ Rhode Isl, Dept Chem Engn, Kingston, RI 02881 USA

来源：

ACS APPLIED MATERIALS & INTERFACES | 2013年 / 5卷 / 09期

基金：

美国国家科学基金会;

关键词：

oil spill; remediation; stability; dispersion; biopolymer; Corexit; modified chitosan; dispersant; crude oil; molecular weight; gel; CHEMICAL DISPERSANT EFFICACY; CHITOSAN; EMULSIONS; CHITIN; DERIVATIVES; TOXICITY; SURFACE;

D O I：

10.1021/am303000v

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The stability of crude oil droplets formed by adding chemical dispersants can be considerably enhanced by the use of the biopolymer, hydrophobically modified chitosan. Turbidimetric analyses show that emulsions of crude oil in saline water prepared using a combination of the biopolymer and the well-studied chemical dispersant (Corexit 9500A) remain stable for extended periods in comparison to emulsions stabilized by the dispersant alone. We hypothesize that the hydrophobic residues from the polymer preferentially anchor in the oil droplets, thereby forming a layer of the polymer around the droplets. The enhanced stability of the droplets is due to the polymer layer providing an increase in electrostatic and steric repulsions and thereby a large barrier to droplet coalescence. Our results show that the addition of hydrophobically modified chitosan following the application of chemical dispersant to an oil spill can potentially reduce the use of chemical dispersants. Increasing the molecular weight of the biopolymer changes the rheological properties of the oil-in-water emulsion to that of a weak gel. The ability of the biopolymer to tether the oil droplets in a gel-like matrix has potential applications in the immobilization of surface oil spills for enhanced removal.

引用

页码：3572 / 3580

页数：9

共 42 条

[1] Interfacial properties of dynamic association between chitin derivatives and surfactants [J].