Preparation characteristics and accelerating denitrification effectiveness of polyamide 6 modified by AQS

Abstract

In this study, the functional polymer biocarrier polyamide 6 (PA6) modified by anthraquinone-2-sulphonate (AQS) was synthesized by hydrolysis and sulphonation reactions. The optimal hydrolysis conditions of PA6 were 35 °C, 3 mol/L HCl and 72 h reaction time. The optimal sulphonation conditions of PA6 modified by AQS (PA6-AQS) were 30 °C and 6 h reaction time. The morphology and heat resistance of PA6-AQS were analysed by scanning electron microscopy, thermogravimetric analysis and differential scanning calorimetry. The AQS content of PA6-AQS, determined by an elemental analysis, was approximately 0.11 mmol/g. The denitrification efficiency was enhanced by 1.78-fold with PA6-AQS. Repeated-batch operations showed that the denitrification efficiency with PA6-AQS became stabilized above 80% of the original value and exhibited a better catalytic activity and durability.

Keywords:

• polyamide
• functional polymer biocarrier
• catalysts
• applications
• dyes/pigments

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This study was supported by Supporting Program for New Century Excellent Talents in University 12 [grant number NCET-10-0127], National Natural Science Foundation of China [grant number 51208170], Program for Hundred Outstanding Innovation Talents in Hebei Universities (II) [grant number BR2-211] and Hebei Natural Science Foundation for Distinguished Young Scholars [grant number E2012208012].