Seawater Modification of Lignocellulosic Fibers from Wheat Straw: Effects of Temperature, Ultrasonic, and Microwave Fields

ABSTRACT

In this study, the effects of physical fields on the seawater modification of lignocellulosic fibers obtained from wheat straw were investigated by incorporating three types of physical fields, namely temperature, ultrasonic, and microwave fields, into seawater based on the response surface methodology. The results obtained herein suggests that the optimum parameters of temperature, ultrasonic, and microwave fields were 82.2°C + 53 min, 80 W + 49 min, and 420 W + 28.3 min, respectively. Seawater/physical field modification resulted in lesser hydroxyl groups, hemicellulose content, and silicon content, as well as higher crystallinity, surface roughness, and thermal stability. From the viewpoint of surface, chemical, and thermal properties, seawater/microwave field exhibited the best modification effect, followed by those of seawater/temperature field and seawater/ultrasonic field. The silicon content was decreased from 29.9 to 10.1 wt.% after seawater/microwave field modification. Moreover, the crystallinity and degradation temperature at 5% weight loss increased from 48.5 to 55.2% and 96 to 175°C, respectively.

摘要

本研究采用响应面法, 在海水中加入温度场、超声波场和微波场, 研究了物理场对麦秸木质纤维海水改性的影响. 结果表明, 温度场、超声场和微波场的最佳参数分别为82.2°C+53 min、80 w + 49min和420 w + 28.3 min. 海水/物理场改性使羟基、半纤维素含量和硅含量减少, 结晶度、表面粗糙度和热稳定性提高. 从表面性质、化学性质和热性质来看, 海水/微波场的改性效果最好, 其次是海水/温度场和海水/超声波场. 海水/微波场改性后, 硅含量从29.9%降至10.1%. 此外, 结晶度和5%重量损失时的降解温度分别从48.5%和96°C增加到55.2%和175°C.

KEYWORDS:

• Lignocellulosic fibers
• wheat straw
• seawater modification
• temperature field
• ultrasonic field
• microwave field

关键词:

• 木质纤维
• 麦秸
• 海水改性
• 温度场
• 超声场
• 微波场

Disclosure statement

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Additional information

Funding

This research was funded by Natural Science Foundation of the Higher Education Institutions of Anhui Province (Grant. No. KJ2020A0283) and National Natural Science Foundation of China (Grant. No. 51804007).