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利用甘蔗渣残渣制备的无粘结剂热压颗粒活性炭吸附亚甲基蓝

Adsorption of Methylene Blue Using As-Developed Binderless Hot-Pressed Granular Activated Carbon Derived from Sugarcane Bagasse Residues.

作者信息

Inthapat Pimonpan, Worasuwannarak Nakorn, Li Xian, Yao Hong, Sutthasupa Sutthira, Prachakittikul Pensiri, Koo-Amornpattana Wanida, Klaitong Paeka, Chaiwat Weerawut

机构信息

Department of Chemical Engineering, Faculty of Engineering, Mahidol University, Nakhon Pathom 73170, Thailand.

The Joint Graduate School of Energy and Environment, King Mongkut's University of Technology Thonburi, Bangkok 10140, Thailand.

出版信息

ACS Omega. 2025 Jul 31;10(31):34618-34632. doi: 10.1021/acsomega.5c03372. eCollection 2025 Aug 12.

Abstract

This study aims to develop sugarcane bagasse-derived granular activated carbon (SCB-GAC) as a biobased adsorbent for methylene blue (MB) adsorption in an aqueous solution using a binderless hot-pressed (HP) technique. HP conditions, i.e., mechanical pressure, temperature, and holding time, were systematically fine-tuned to first produce HP-SCB pellets. HP pellets were further carbonized at 500 °C for 1 h to obtain biochar pellets, which were cut into granules prior to activation with steam under the optimum conditions of 850 °C for 30 min. The mechanical pressure showed the most significant influence on the yield and textural properties of the as-developed HP-SCB-GAC. The optimal HP condition of 20 MPa at 270 °C for 30 min resulted in a substantial yield (53.7%) of the developed HP-SCB-GAC with uniform surface texture possessing the highest strength and specific surface area (804.6 m/g). The MB adsorption using the selected HP-SCB-GAC showed minimal sensitivity to pH adjustments. The maximum MB adsorption capacity at approximately 138 mg/g could be achieved and fitted with the pseudo-second-order kinetic model and Langmuir equilibrium isotherm behaviors. The selected HP-SCB-GAC could reach as high as 87-92% of MB adsorption efficiency for at least five consecutive cycles using ethanol as the regenerant.

摘要

本研究旨在采用无粘结剂热压(HP)技术,开发甘蔗渣衍生的颗粒活性炭(SCB-GAC)作为一种生物基吸附剂,用于水溶液中甲基蓝(MB)的吸附。对HP条件,即机械压力、温度和保温时间进行了系统微调,以首先制备HP-SCB颗粒。将HP颗粒在500℃下进一步碳化1小时,得到生物炭颗粒,在850℃、30分钟的最佳条件下用蒸汽活化之前,将其切成颗粒。机械压力对所开发的HP-SCB-GAC的产率和结构性质影响最为显著。在270℃、20MPa、30分钟的最佳HP条件下,所开发的HP-SCB-GAC产率可观(53.7%),表面质地均匀,具有最高强度和比表面积(804.6m²/g)。使用所选的HP-SCB-GAC进行MB吸附对pH调节的敏感性最小。可实现约138mg/g的最大MB吸附容量,且符合准二级动力学模型和朗缪尔平衡等温线行为。使用乙醇作为再生剂,所选的HP-SCB-GAC在至少五个连续循环中可达到高达87-92%的MB吸附效率。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/68ad/12355300/d6729340326f/ao5c03372_0001.jpg

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