酸性矿山排水(AMD)是与采矿活动有关的环境问题,导致矿区释放有毒水。聚醚砜(PES)膜用于AMD治疗,但是它们有限的亲水性阻碍了它们的性能。壳聚糖增强亲水性,解决这个问题。然而,有效性取决于壳聚糖的脱乙酰度(DD),在壳聚糖生产的脱乙酰过程中确定。本研究优化了甲壳素脱乙酰温度,碱性(NaOH)浓度,和反应时间,对于PES/壳聚糖膜应用,壳聚糖脱乙酰度(DD)最高。先前的研究表明,高DD壳聚糖增强膜的防污和亲水性,增加污染物截留率和渗透通量。根据温度(80、100、120°C)评估最佳脱乙酰条件,NaOH浓度(20、40、60wt。%),和时间(2,4,6小时)进行。在80°C下获得的最高壳聚糖DD为87.11%,40wt。%NaOH在4小时的甲壳素脱乙酰。与原始PES膜(72.83°接触角)相比,PES/0.75壳聚糖膜(87.11%DD)显示表面亲水性(63.62°接触角)增加。这表明了膜性能的改善。因此,推测在AMD治疗背景下导致高污染物排斥和渗透通量,对文学的假设。
Acid mine drainage (AMD) is an environmental issue linked with mining activities, causing the release of toxic water from mining areas. Polyethersulphone (PES) membranes are explored for AMD treatment, but their limited
hydrophilicity hinders their performance. Chitosan enhances
hydrophilicity, addressing this issue. However, the effectiveness depends on chitosan\'s degree of deacetylation (DD), determined during the deacetylation process for chitosan production. This study optimized the chitin deacetylation temperature, alkaline (NaOH) concentration, and reaction time, yielding the highest chitosan degree of deacetylation (DD) for PES/chitosan membrane applications. Prior research has shown that high DD chitosan enhances membrane antifouling and
hydrophilicity, increasing contaminant rejection and permeate flux. Evaluation of the best deacetylation conditions in terms of temperature (80, 100, 120 °C), NaOH concentration (20, 40, 60 wt.%), and time (2, 4, 6 h) was performed. The highest chitosan DD obtained was 87.11% at 80 °C, 40 wt. %NaOH at 4 h of chitin deacetylation. The PES/0.75 chitosan membrane (87.11%DD) showed an increase in surface
hydrophilicity (63.62° contact angle) as compared to the pristine PES membrane (72.83° contact angle). This was an indicated improvement in membrane performance. Thus, presumably leading to high contaminant rejection and permeate flux in the AMD treatment context, postulate to literature.