ABSTRACT

In this work, NaOH-activated Aerva javanica leaf (NAJL) powder was successfully developed as a cost-effective adsorbent for removal of crystal violet (CV) from an aqueous environment. The prepared adsorbent was characterized using FTIR, SEM, and their surface area was determined by BET technique. Different parameters affecting the adsorption of CV dye such as pH solution, adsorbent dose, equilibrium time, initial CV concentration, and temperature were investigated. The results revealed that the best-optimized values were found as pH–9, dose–20 mg, time–30 min, temperature– 25 ^°C. The adsorption experimental data exhibited excellently fitted well to the nonlinear Langmuir isotherm and Pseudo-first-order kinetic models. The maximum monolayer adsorption capacity of CV dye was 315.2 mg/g. The experimental parameters of thermodynamic analysis exhibited that the CV dye adsorption onto NAJL powder was exothermic and spontaneous. Electrostatic attraction, π-π interactions, and Hydrogen bonding were the mechanism behind the adsorption of CV dye.

摘要

在这项工作中，NaOH 活化的Aerva javanica 叶 (NAJL) 粉末被成功开发为一种具有成本效益的吸附剂，用于从水性环境中去除结晶紫 (CV)。用FTIR、SEM对制备的吸附剂进行表征，并通过BET技术测定其表面积。研究了影响 CV 染料吸附的不同参数，如 pH 溶液、吸附剂剂量、平衡时间、初始 CV 浓度和温度。结果表明，最佳优化值为 pH–9、剂量–20 mg、时间–30 min、温度– 25  ^°C. 吸附实验数据与非线性朗缪尔等温线和伪一级动力学模型非常吻合。CV染料的最大单层吸附容量为315.2 mg/g。热力学分析的实验参数表明，CV 染料吸附在 NAJL 粉末上是放热和自发的。静电引力、π-π 相互作用和氢键是 CV 染料吸附背后的机制。