On the potential of pristine Cocos nucifera L. tissues for green desalination

A. Adelodun
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Abstract

Coconut palm tree (Cocos nucifera L.) tissues were used as a readily available, low-cost and green adsorbent to desalinate seawater. The tree bark (CB), husk (CH), leaves (CL) and roots (CR) were examined in their fresh (F) and dry (D) forms. The salinity removal (adsorption) efficiency followed the trend: F_CB ≈ F_CR > F_CL > D_CR > F_CL > D_CR. The sorbents from the coastal region desalinated more efficiently than those from a non-coastal region. Also, the fresh tissues were more effective and efficient than the dry parts. The salinity retention ability (desalination : desorption) follows the trend: F_CR (22.2) > F_CB (19.0) ≫ D_CR (12.3) > D_CB (11.0) > D_CL (6.14) ≈ F_CL (6.10) > F_CH (4.3) > D_CH (2.1). Moreover, the desalination fitted the pseudo-second-order kinetics than the pseudo-first-order, suggesting the predominance of chemisorption over physical removal. Overall, water pH, conductivity, total dissolved solids and dissolved oxygen (DO) correlated positively and strongly with desalination. By contrast, the density and redox potential correlated negatively, whereas temperature and DO showed no definite influence. Conclusively, F_CR and F_CB are the most suitable coconut palm tree tissues for desalination. Future studies should include chemical characterization of the tissues and system optimization for upscaling. This article is part of the theme issue ‘Developing resilient energy systems’.
原始椰树组织在绿色海水淡化中的潜力
利用椰树组织作为一种易于获得、低成本、绿色的海水脱盐吸附剂。在新鲜(F)和干燥(D)状态下,对树皮(CB)、皮(CH)、叶(CL)和根(CR)进行了检测。除盐(吸附)效率依次为:F_CB≈F_CR > F_CL > D_CR > F_CL > D_CR。来自沿海地区的吸附剂比来自非沿海地区的吸附剂脱盐效率更高。此外,新鲜的组织比干燥的部分更有效。盐度保持能力(脱盐:脱附)表现为:F_CR (22.2) > F_CB (19.0) > D_CR (12.3) > D_CB (11.0) > D_CL(6.14)≈F_CL (6.10) > F_CH (4.3) > D_CH(2.1)。此外,海水淡化符合准二级动力学而非准一级动力学,表明化学吸附优于物理去除。总体而言,水的pH值、电导率、总溶解固体和溶解氧(DO)与海水淡化呈正相关。相反,密度与氧化还原电位呈负相关,而温度和DO没有明显的影响。综上所述,F_CR和F_CB是最适合海水淡化的椰树组织。未来的研究应包括组织的化学特性和系统优化的升级。本文是“发展有弹性的能源系统”主题问题的一部分。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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