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农业废弃物衍生的 KOH/FeCl 改性生物炭/海藻酸钠复合珠粒对亚甲基蓝的吸附性能。

Adsorption Performance of Methylene Blue by KOH/FeCl Modified Biochar/Alginate Composite Beads Derived from Agricultural Waste.

机构信息

School of Chemistry and Environmental Engineering, Wuhan Polytechnic University, Wuhan 430023, China.

China-Ukraine Institute of Welding, Guangdong Academy of Sciences, Guangzhou 510650, China.

出版信息

Molecules. 2023 Mar 9;28(6):2507. doi: 10.3390/molecules28062507.

DOI:10.3390/molecules28062507
PMID:36985479
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10052162/
Abstract

In this study, high-performance modified biochar/alginate composite bead (MCB/ALG) adsorbents were prepared from recycled agricultural waste corncobs by a high-temperature pyrolysis and KOH/FeCl activation process. The prepared MCB/ALG beads were tested for the adsorption of methylene blue (MB) dye from wastewater. A variety of analytical methods, such as SEM, BET, FTIR and XRD, were used to investigate the structure and properties of the as-prepared adsorbents. The effects of solution pH, time, initial MB concentration and adsorption temperature on the adsorption performance of MCB/ALG beads were discussed in detail. The results showed that the adsorption equilibrium of MB dye was consistent with the Langmuir isothermal model and the pseudo-second-order kinetic model. The maximum adsorption capacity of MCB/ALG-1 could reach 1373.49 mg/g at 303 K. The thermodynamic studies implied endothermic and spontaneous properties of the adsorption system. This high adsorption performance of MCB/ALG was mainly attributed to pore filling, hydrogen bonding and electrostatic interactions. The regeneration experiments showed that the removal rate of MB could still reach 85% even after five cycles of experiments, indicating that MCB/ALG had good reusability and stability. These results suggested that a win-win strategy of applying agricultural waste to water remediation was feasible.

摘要

在这项研究中，通过高温热解和 KOH/FeCl 活化工艺，从回收的农业废弃物玉米芯制备了高性能改性生物炭/海藻酸钠复合珠粒（MCB/ALG）吸附剂。将制备的 MCB/ALG 珠粒用于吸附废水中的亚甲基蓝（MB）染料。采用 SEM、BET、FTIR 和 XRD 等多种分析方法对所制备的吸附剂的结构和性能进行了研究。详细讨论了溶液 pH 值、时间、初始 MB 浓度和吸附温度对 MCB/ALG 珠粒吸附性能的影响。结果表明，MB 染料的吸附平衡符合 Langmuir 等温模型和准二级动力学模型。在 303 K 时，MCB/ALG-1 的最大吸附容量可达 1373.49 mg/g。热力学研究表明吸附体系是吸热和自发的。MCB/ALG 具有如此高的吸附性能主要归因于孔填充、氢键和静电相互作用。再生实验表明，即使经过五次实验循环，MB 的去除率仍可达到 85%，表明 MCB/ALG 具有良好的可重复使用性和稳定性。这些结果表明，将农业废弃物应用于水修复的双赢策略是可行的。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/31fb/10052162/da1eaaa61003/molecules-28-02507-g008.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/31fb/10052162/c30d79a1c865/molecules-28-02507-g006.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/31fb/10052162/da1eaaa61003/molecules-28-02507-g008.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/31fb/10052162/2ec4a9abef3c/molecules-28-02507-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/31fb/10052162/ec62dd46550c/molecules-28-02507-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/31fb/10052162/cbf26d364d4f/molecules-28-02507-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/31fb/10052162/8ac51765dd23/molecules-28-02507-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/31fb/10052162/c30d79a1c865/molecules-28-02507-g006.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/31fb/10052162/da1eaaa61003/molecules-28-02507-g008.jpg

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