Synthesis, Characterization, and Utilization of Water Hyacinth (Eichhornia crassipes) Magnetic Biochar for Nitrate Removal from Simulated Wastewater

Key Engineering Materials Pub Date : 2024-04-18 DOI:10.4028/p-mqqs5n

Tristan Roy L. Panaligan, Andrea Kate S. Lee, Chelsea J. Petareal, Jhon Rex Tadena

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Abstract

The research centered on creating magnetic water hyacinth biochar (MWHB) by chemically co-precipitating Fe2+ and Fe3+ ions onto the initial biomass, which was pyrolyzed at 450°C for an hour. This MWHB was then utilized in a series of batch adsorption experiments to evaluate its effectiveness in removing nitrates from simulated wastewater. The investigation focused on understanding the impact of pH, amount of adsorbent used, and duration of contact on nitrate removal efficiency. These parameters were selected using a 2k+1 Full Factorial Design of Experiments (DOE). The data collected from the experiments underwent analysis in JMP® (SAS institute) using Pearson’s Correlation test, providing a comprehensive statistical analysis beyond utilizing the software's Prediction Profiler. The findings revealed that the quantity of adsorbent used significantly affected the nitrate removal efficiency of the magnetic biochar, demonstrating a correlation coefficient (r) of 0.8459. On the other hand, pH and contact time exhibited relatively weaker effects, obtaining correlation coefficients of-0.1943 and 0.2915, respectively. The DOE suggested the optimal conditions for nitrate removal to be at pH 3, utilizing 0.40 grams of adsorbent, and maintaining a contact time of 90 minutes, with a predicted nitrate removal efficiency of approximately 99.10%, while the actual removal efficiency stood at 97.31%. Additionally, Scanning Electron Microscopy (SEM) analysis was employed to examine the surface morphology of the MWHB before and after nitrate removal, aiding in understanding the factors contributing to the observed nitrate removal efficiency.

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水葫芦（Eichhornia crassipes）磁性生物炭的合成、表征和利用，用于去除模拟废水中的硝酸盐

研究的核心是通过化学方法将 Fe2+ 和 Fe3+ 离子共沉淀到初始生物质上，然后在 450°C 下热解一小时，从而制造出磁性水葫芦生物炭（MWHB）。然后利用这种 MWHB 进行一系列批量吸附实验，以评估其从模拟废水中去除硝酸盐的效果。调查的重点是了解 pH 值、吸附剂用量和接触时间对硝酸盐去除效率的影响。这些参数是通过 2k+1 全因子实验设计 (DOE) 选定的。从实验中收集的数据在 JMP® （SAS 研究所）中进行了分析，使用了皮尔逊相关性检验，提供了超越软件预测剖析器的综合统计分析。研究结果表明，使用的吸附剂数量对磁性生物炭的硝酸盐去除效率有显著影响，相关系数 (r) 为 0.8459。另一方面，pH 值和接触时间的影响相对较弱，相关系数分别为-0.1943 和 0.2915。DOE 认为，去除硝酸盐的最佳条件是 pH 值为 3，使用 0.40 克吸附剂，接触时间为 90 分钟，预测的硝酸盐去除率约为 99.10%，而实际去除率为 97.31%。此外，还采用扫描电子显微镜（SEM）分析法检查了 MWHB 在去除硝酸盐之前和之后的表面形态，以帮助了解导致观察到的硝酸盐去除效率的因素。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Key Engineering Materials

CiteScore

1.00

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0.00%

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