纳米羧化壳聚糖在污水无机阴离子去除中的研究

Research on the removal of inorganic anions in wastewater using nano-carboxylated chitosan

本文旨在研究合成纳米修饰的羧化壳聚糖吸附剂,并将其应用于去除污水中无机阴离子。采用两步法将铁纳米颗粒嫁接至羧化壳聚糖得到纳米羧化壳聚糖吸附剂,用傅立叶变换红外光谱(FTIR)和动态光散射法(DLS)进行表征。评估pH值、吸附剂浓度、阴离子浓度和接触时间对吸附剂吸附阴离子的影响,结果表明,在酸性pH值范围内吸附的阴离子浓度较高。吸附剂浓度越高,吸附速率越高。在接触时间为10~60min时,吸附阴离子的量随接触时间的增加而增加,而在接触时间超过60min后,吸附阴离子的量基本不变。研究结果表明,壳聚糖改性吸附剂可以有效地去除水溶液中的NO_(3)^(-)、F^(-)和PO_(4)^(3-)等阴离子。

The aim of this study is to synthesize nano-modified carboxylated chitosan adsorbents and apply them to remove inorganic anions from wastewater.Iron nanoparticles were grafted onto carboxylated chitosan in a two-step process to obtain nano-carboxylated chitosan adsorbents,which were characterized using Fourier transform infrared spectroscopy(FTIR)and dynamic light scattering(DLS).The effects of pH value,adsorbent concentration,anion concentration,and contact time on the adsorption of anions by the adsorbent were evaluated.The results showed that the concentration of adsorbed anions was higher at acidic pH.The higher the adsorbent concentration,the higher the adsorption rate.The amount of adsorbed anions increased with increasing contact time from 10~60 minutes,but remained relatively constant after 60 minutes.The study results indicate that chitosan-modified adsorbents can effectively remove nitrate,fluoride,and phosphate anions from aqueous solutions.