Coconut waste (CW), a novel, low cost adsorbent, has been utilized for the removal of methylene blue (MB) dye from an aqueous solution. CW was chemically modified with acrylic (AcA) and polyacrylic acids (PAcA) using different modification methods, such as esterification with AcA, chemically grafting of PAcA, and plasma-enhanced chemical vapor deposition (PECVD) coating with PAcA. CW-based adsorbents were used in the experiments to study MB adsorption probability, and their activities were compared. The adsorption behavior of MB onto the adsorbents was investigated with respect to parameters such as sorbent dosage (0.5–4 g/L), pH (2–10), initial dye concentration (50–250 mg/L), and temperature (22–65 °C). The time taken of AcA modified CW (CW-AcA), PAcA-grafted CW (CW-PAcA_grafted), and PAcA-coated CW (CW-PAcA_coated) for the removal of 94.6%, 97.7%, and 91.0% of MB from 50 mg/L of dye solution is 180 min. Characterization of CW-based adsorbents was achieved using SEM, XRD, BET, XPS, and FT-IR analysis. The adsorption fitted the Langmuir model, and the adsorption kinetics were consistent with a pseudosecond-order kinetics model. The results obtained from the maximum adsorption capacity (q_max) for AcA-, PAcA_coated-, and PAcA_grafted-CWs were 138.88, 136.98, and 98.03 mg/g at adsorbent dose of 0.1 g/50 mL for initial dye concentration of 200 mg/L, 22 ± 1 °C, and pH 10:10:8.

椰子废料（CW）是一种新型的低成本吸附剂，已用于从水溶液中去除亚甲基蓝（MB）染料。使用不同的改性方法，用丙烯酸（AcA）和聚丙烯酸（PAcA）对CW进行化学改性，例如用AcA酯化，化学接枝PAcA以及使用PAcA进行等离子体增强化学气相沉积（PECVD）涂层。实验中使用了基于CW的吸附剂来研究MB的吸附可能性，并比较了它们的活性。研究了MB在吸附剂上的吸附行为，涉及的参数包括吸附剂剂量（0.5–4 g / L），pH（2–10），初始染料浓度（50–250 mg / L）和温度（22）。 –65°C）。AcA修饰CW（CW-AcA），PAcA接枝CW（CW-PAcA_接枝）和PAcA包覆CW（CW-PAcA）花费的时间_涂）用于去除94.6％，97.7％，和50毫克的MB 91.0％/染料溶液L为180分钟。使用SEM，XRD，BET，XPS和FT-IR分析可对基于CW的吸附剂进行表征。吸附符合Langmuir模型，并且吸附动力学与伪二级动力学模型一致。从AcA-，PAcA_包覆的PAW和PAcA_接枝的CW的最大吸附容量（q _max）得到的结果是在200 g初始染料浓度为0.1 g / 50 mL的吸附剂量下为138.88、136.98和98.03 mg / g mg / L，22±1°C，pH 10：10：8。