Abstract

In the present study, Mentha plant ash was modified by Na and Al for the synthesis of adsorbent and applied for the removal of Fluoride from an aqueous solution. Mixture of acid washed Mentha plant ash (MPA) and NaOH (in the ratio 1:1.3) thermally treated at 600°C in a muffle furnace then treated with aqueous solution of sodium aluminate. The characterization of sodium aluminum modified ash (Na-Al-MA) powder was done such as SEM (Scanning Electron Microscopy), Particle Size Analysis (PSA), Fourier transformed spectroscopy (FTIR), Zeta Potential, XRD (X-ray Diffraction) analysis, and Brunauer–Emmett–Teller (BET) analysis. The removal of fluoride from an aqueous solution carried out with Na-Al-MA by batch adsorption process. The Na-Al-MA was found to be very effective as adsorbent. The maximum removal of fluoride was achieved ̴ 86% at neutral pH and at room temperature. It was investigated that Langmuir adsorption isotherm and pseudo-second-order kinetic was best fitted for fluoride adsorption. The fluoride adsorption on Na-Al-MA was an exothermic process. A possible mechanism including electrostatic attraction, hydrogen bonding, and metal-fluoride interaction for fluoride adsorption on Na-Al-MA have described in this study.

Novelty statement: Utilization of Mentha plant ash for the development of adsorbent and its application in adsorptive removal of fluoride from aqueous solution is the novelty of this work. Adsorbent preparation may be the better way of waste biomass management.

摘要

在本研究中，薄荷植物灰被 Na 和 Al 改性以合成吸附剂，并应用于从水溶液中去除氟化物。酸洗过的薄荷植物灰 (MPA) 和 NaOH（比例为 1:1.3）的混合物，在马弗炉中在 600°C 下热处理，然后用铝酸钠水溶液处理。对钠铝改性灰分 (Na-Al-MA) 粉末进行表征，例如 SEM（扫描电子显微镜）、粒度分析（PSA）、傅里叶变换光谱（FTIR）、Zeta 电位、XRD（X 射线衍射）分析和布鲁瑙尔-埃米特-特勒 (BET) 分析。Na-Al-MA 通过间歇吸附法从水溶液中去除氟化物。发现 Na-Al-MA 作为吸附剂非常有效。在中性 pH 值和室温下，氟化物的最大去除率达到 ̴ 86%。研究表明，Langmuir 吸附等温线和准二级动力学最适合氟化物吸附。Na-Al-MA 上的氟化物吸附是一个放热过程。本研究描述了一种可能的机制，包括静电引力、氢键和金属 - 氟化物相互作用在 Na-Al-MA 上吸附氟化物。

新颖性声明：利用薄荷植物灰开发吸附剂及其在水溶液中吸附去除氟化物的应用是这项工作的新颖性。吸附剂制备可能是废物生物质管理的更好方法。