Fabrication of low-fire-hazard flexible poly (vinyl chloride) via reutilization of heavy metal biosorbents

[Display omitted] •Tin oxyanion in tin plating wastewater is adsorbed by chitosan-coated PVC resin.•Tin-doped chitosan-coated PVC resin is processed into flexible PVC composite.•The modification reduces fire hazards of flexible PVC composite with reduced HCl amount.•The tensile property of flexible...

Full description

Saved in:
Bibliographic Details
Published in:Journal of hazardous materials 2017-10, Vol.339, p.143-153
Main Authors: Pan, Ye-Tang, Wang, De-Yi
Format: Article
Language:English
Subjects:
Adsorption
Biosorbent
Calorimetry
Chitosan - chemistry
Fire hazard
Flame Retardants
HCl removal
Poly(vinyl chloride)
Polyvinyl Chloride - chemistry
Thermogravimetry
Tin Compounds - chemistry
Waste Water
Water Pollutants, Chemical - chemistry
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:[Display omitted] •Tin oxyanion in tin plating wastewater is adsorbed by chitosan-coated PVC resin.•Tin-doped chitosan-coated PVC resin is processed into flexible PVC composite.•The modification reduces fire hazards of flexible PVC composite with reduced HCl amount.•The tensile property of flexible PVC composite was also enhanced.•This approach has the potential to achieve Sb2O3-free flame retardant flexible PVC. As a naturally abundant biopolymer, chitosan is considered to be a suitable adsorbent for stannate (SnO32−) in tin plating wastewater. However, mass transfer of the adsorbent and its recycling remain challenging problems. Though flexible poly(vinyl chloride) (PVC) is highly flammable due to the addition of plasticizers, the traditional flame retardant, antimony trioxide (Sb2O3), is potentially harmful. In this study, chitosan was anchored onto the surface of PVC resin to adsorb SnO32− from wastewater. Thereafter, tin-doped chitosan-coated PVC resin was readily recycled and processed into a flexible PVC composite (modified fPVC). The limiting oxygen index value of the modified fPVC increased to 33.1%, and the peak heat release rate decreased to 161kW/m2. In addition to reducing fire hazards, this approach also decreased the content of harmful hydrogen chloride gas released during the combustion of modified fPVC. Meanwhile, the tensile properties of modified fPVC were enhanced compared with those of the Sb2O3-treated sample. These results indicated the synthesis of an eco-friendly Sb2O3-free flexible PVC composite that poses a low fire hazard.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2017.05.047