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Highly efficient removal of diazinon pesticide from aqueous solutions by using coconut shell-modified biochar
Arabian Journal of Chemistry ( IF 6 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.arabjc.2020.05.011
Nor Atikah Baharum , Hanisah Mohmad Nasir , Mohd Yusoff Ishak , Noorain Mohd Isa , Mohd Ali Hassan , Ahmad Zaharin Aris

Abstract This study evaluates the adsorption of diazinon from aqueous solutions onto coconut shell-modified biochar using a batch system. The amount of dosage and initial pH are the main parameters being studied to obtain maximum adsorption capacity of the probe molecules. The carbonized coconut shell biochar (BC1), activated coconut shell biochar (BC2), chemically modified phosphoric acid (BC3) and sodium hydroxide coconut shell biochar (BC4) were prepared and tested as variables in the adsorption experiment. The characteristic of biochar via SEM, EDX and BET analysis revealed the large porous of surface morphology and slight changes in the composition with high surface area (405.97 – 508.07 m2/g) by following the sequence of BC3 > BC2 > BC4. Diazinon removal percentage as high as 98.96% was achieved at pH 7 with BC3 as adsorbent dosing at 5.0 g/L. The high coefficient of determination, R2 with a small value of ERRSQ and χ2 error analysis present the BC1 (0.9971) and BC2 (0.9999) are best fitted with Freundlich isotherm indicates multilayer sorption onto heterogeneous surface whereby the Langmuir isotherm model is the best fitting is described of monolayer adsorption process onto the homogenous surface of BC3 and BC4. The results indicated the maximum adsorption capacity (qm) was achieved by BC3 with 10.33 mg/g, followed by BC2 (9.65 mg/g) in accordance to the Langmuir isotherm while Freundlich isotherm showed the highest adsorption capacity (kF) with 1.73 mg/g (L/mg)1/n followed by BC4 with 0.63 mg/g (L/mg)1/n at favorable adsorption isotherm (1 ≤ n ≤ 10). Thus, the results obtained depicted that BC2 and BC3 are highly efficient adsorbents and both exhibit great potential in removing diazinon from aqueous solutions.

中文翻译:

椰壳改性生物炭高效去除水溶液中二嗪农农药

摘要 本研究使用批处理系统评估了水溶液中二嗪农在椰壳改性生物炭上的吸附。剂量和初始 pH 值是正在研究的主要参数,以获得探针分子的最大吸附能力。制备碳化椰壳生物炭 (BC1)、活化椰壳生物炭 (BC2)、化学改性磷酸 (BC3) 和氢氧化钠椰壳生物炭 (BC4) 作为吸附实验中的变量。通过 SEM、EDX 和 BET 分析,生物炭的特征表明,按照 BC3 > BC2 > BC4 的顺序,表面形态的大孔隙和高表面积(405.97 – 508.07 m2/g)的组成略有变化。二嗪酮去除率高达98。在 pH 7 下达到 96%,BC3 作为吸附剂剂量为 5.0 g/L。高决定系数、具有较小 ERRSQ 值的 R2 和 χ2 误差分析表明 BC1 (0.9971) 和 BC2 (0.9999) 最适合 Freundlich 等温线表明多层吸附到异质表面,其中 Langmuir 等温线模型是最佳拟合描述了单层吸附过程到 BC3 和 BC4 的同质表面。结果表明,根据朗缪尔等温线,BC3 达到了最大吸附容量 (qm),为 10.33 mg/g,其次是 BC2 (9.65 mg/g),而 Freundlich 等温线显示出最高吸附容量 (kF),为 1.73 mg/g g (L/mg)1/n 其次是 BC4,在有利的吸附等温线 (1 ≤ n ≤ 10) 下为 0.63 mg/g (L/mg)1/n。因此,
更新日期:2020-07-01
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