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通过树网状物从水溶液中生物吸收pb (II):吸附性研究和建模

Soma Nag¹, Sugam Bhowmik¹, Nirjhar Bar²

¹Department of Chemical Engineering, National Institute of Technology Agartala, Tripura, India.

International journal of phytoremediation

|July 5, 2024

概括

皮有效地从水中去除有毒的 (Pb (II)) 离子,这是由于它们的多孔结构. 这种水果废弃物为整治提供了可持续的解决方案,实现了高清除效率.

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:

(Pb (II)) 离子是源自工业活动的有毒环境污染物.
从水溶液中去除重金属的有效和可持续方法对于环境保护至关重要.
农业废物,如果皮,代表了一个潜在的低成本的生物吸收材料.

研究的目的:

研究普通 (Citrus reticulate) 皮作为生物吸收剂,从水溶液中去除有毒Pb (II) 离子的有效性.
描述普通皮粉末的表面特性,并确定负责吸附的功能群.
优化吸附参数,评估生物吸附剂的吸附机制和可重复使用性.

主要方法:

使用扫描电子显微镜 (SEM),Brunauer-Emmett-Teller (BET) 分析和富里埃变换红外光谱 (FTIR) 进行香皮粉末的表征.
优化吸附参数,包括pH值,吸附剂度,生物吸收剂剂量,接触时间和温度.
分别使用伪二阶模型和朗迈尔模型进行动力学和异热学研究. 进行了吸附-脱附周期,以评估可重复使用性.
使用多重多项式回归 (MPR) 和遗传算法 (GA) 进行预测和优化的统计分析.

主要成果:

色皮粉具有多孔表面积 (32.46 m2g-1),多孔体积 (0.402 cm3g-1),平均多孔大小 (38.6 Å),适合Pb (II) 结合.
FTIR分析确定了参与Pb (II) 离子复合的功能组 (性O-H,C-O,N=C=N).
在最佳条件下,在20毫克L-1度和2.5克L-1生物吸收剂剂量下,达到97.08%的Pb(II) 清除.
吸附遵循伪二次动力学和兰迈尔异热模型,最大吸附能力为23.04毫克g-1.1.
生物吸收剂显示适度的可重复使用性,在第3次吸附-脱附循环中使用0.4M HCl.去除35.28%的Pb.
吸附过程被确定为自发的,内热的,并由粒子内部扩散驱动.

结论:

子皮是一种经济高效且环保的生物吸收剂,用于从污染水中去除Pb (II) 离子.
皮层的多孔结构和功能组对其高吸附能力有很大贡献.
该研究表明,这种方法在工业废水处理中具有扩大规模的潜力.
统计模型 (MPR和GA) 准确地预测和优化了除过程.

关键词:

生物吸收生物吸收果网状树皮的皮肤.在GA建模中使用GA模型.

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