In this study, the potential for pulverized raw macadamia nut shell (MNS) for the sequestration of methylene blue from aqueous media was assessed. The sorbent was characterized using scanning electron microscopy for surface morphology, functional group analysis was performed with a Fourier-transform infrared spectrometer (FT-IR), and Brunauer–Emmett–Teller (BET) isotherm was used for surface area elucidation. The effects of contact time, sorbent dosage, particle size, pH, and change in a solution matrix were studied. Equilibrium data were fitted using Temkin, Langmuir, and Freundlich adsorption isotherm models. The sorption kinetics was studied using the Lagergren pseudo-first-order, pseudo-second-order, Elovich, and intraparticle diffusion models. The feasibility of the study was established from the thermodynamic studies. A surface area of 2.763 m²/g was obtained. The equilibrium and kinetics of sorption was best described by the Langmuir and the pseudo-second-order models, respectively. The sorption process was spontaneous () and endothermic in nature (). The positive value of (0.15 ) implies increased randomness of the sorbate molecules at the surface of the sorbent. This study presents sustainable management of wastewater using MNS as a potential low-cost sorbent for dye decontamination from aqueous solution.

中文翻译：

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使用粉碎的马卡达姆坚果壳从水溶液中吸附亚甲蓝的平衡，动力学和热力学研究。

在这项研究中，评估了粉碎的夏威夷果坚果壳粉（MNS）从含水介质中螯合亚甲基蓝的潜力。使用扫描电子显微镜表征吸附剂的表面形态，使用傅立叶变换红外光谱仪（FT-IR）进行官能团分析，并使用Brunauer-Emmett-Teller（BET）等温线进行表面积解析。研究了接触时间，吸附剂用量，粒径，pH和溶液基质变化的影响。使用Temkin，Langmuir和Freundlich吸附等温线模型拟合平衡数据。使用Lagergren伪一级，伪二级，Elovich和粒子内扩散模型研究了吸附动力学。该研究的可行性由热力学研究确定。表面积为2。获得² / g。吸附的平衡和动力学分别由Langmuir模型和拟二阶模型最好地描述。吸附过程是自发的（）和吸热性（）。正值（0.15）表示吸附剂表面上的吸附物分子的随机性增加。这项研究提出了使用MNS作为潜在的低成本吸附剂对废水中的染料进行去污的可持续管理方法。