一种新的贝生物复合材料,用于从水溶液中有效吸附去除和:合成,工艺优化,建模和机制研究
Abdulrahman Oyekanmi Adeleke1, C O Royahu1, Akil Ahmad2
1Institute of Energy Infrastructure (IEI), Universiti Tenaga Nasional (UNITEN), Putrajaya Campus, Jalan IKRAM-UNITEN, Kajang, Selangor, Malaysia.
PloS one
|February 22, 2024
概括
贝生物复合材料有效地从水中去除 (Cd) 和 (Pb). 使用响应表面方法的优化条件实现了高吸附能力,为重金属去除提供了可持续的解决方案.
科学领域:
- 环境科学 环境科学
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 水溶液中的重金属污染对环境和健康构成重大风险.
- 传统的废水处理方法在去除特定重金属方面可能昂贵且低效.
- 贝是一种丰富,低成本,未充分利用的废物,具有环境修复的潜力.
研究的目的:
- 开发和描述一种由贝取的新型生物复合材料,用于高效地生物吸收 (Cd (II)) 和 (Pb (II)) 离子.
- 使用响应表面方法 (RSM) 来优化生物吸收过程参数.
- 评估改性生物复合材料的吸附能力和机制.
主要方法:
- 修改贝变成生物复合材料.
- 使用BET表面积分析,元素散射X射线分析 (EDS) 和富里埃变换红外光谱学 (FT-IR) 的表征.
- 在RSM中使用中央复合设计 (CCD) 优化工艺变量 (pH,吸附剂剂量,初始度,温度).
- 吸附异温和动力学研究,分别使用兰迈尔和伪二阶模型进行分析.
- 差异分析 (ANOVA) 用于验证RSM模型.
主要成果:
- 贝生物复合材料的特定表面积为9.1476 m2/g.
- EDS证实了C,O,Ag和Ca的存在,在吸附后检测到了Cd和Pb.
- FT-IR显示了参与吸附的基和基功能组.
- 确定了最佳条件:pH为5.57,吸附剂剂量为2.53g/L,初始度为46.76 mg/L,温度为28.48°C.
- 获得的最大吸附能力为Cd (II) 的97.54 mg/g和Pb (II) 的78.99 mg/g.
- 该RSM模型显示高有效性 (R2>0.91) 和适应性.
- 兰木尔等温和和伪二次运动模型最好地描述了实验数据.
结论:
- 修改后的贝生物复合材料是一种高度有效的Cd (II) 和Pb (II) 离子吸收剂.
- RSM成功优化了生物吸收过程,确定了影响关键参数.
- 该研究表明,利用废弃的贝作为一种可持续且具有成本效益的材料,可以从废水中提炼重金属的潜力.
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