Abstract Preparation of modified semi-coke has been achieved, using phosphoric acid as the modifying agent, by microwave heating from virgin semi-coke. Process optimization using a Central Composite Design (CCD) design of Response Surface Methodology (RSM) technique for the preparation of modifies semi-coke is presented in this paper. The optimum conditions for producing modified semi-coke were: concentration of phosphoric acid 2.04, heating time 20 minutes and temperature 587 °C, with the optimum iodine of 862 mg/g and yield of 47.48%. The textural characteristics of modified semi-coke were analyzed using scanning electron microscopy (SEM) and nitrogen adsorption isotherm. The BET surface area of modified semi-coke was estimated to be 989.60 m2/g, with the pore volume of 0.74 cm3/g and a pore diameter of 3.009 nm, with micro-pore volume contributing to 62.44%. The Methylene Blue monolayer adsorption capacity was found to be 98 mg/g at 332 K. The adsorption capacity of the modified semi-coke highlights its suitability for liquid phase adsorption application with a potential usage in waste water treatment.

中文翻译：

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微波加热和亚甲基蓝吸附动力学制备改性半焦

摘要 以磷酸为改性剂，通过微波加热原生半焦制备改性半焦。本文介绍了使用响应面法 (RSM) 技术的中心复合设计 (CCD) 设计制备改性半焦的工艺优化。生产改性半焦的最佳条件为：磷酸浓度2.04，加热时间20分钟，温度587℃，碘的最佳用量为862mg/g，产率为47.48%。使用扫描电子显微镜（SEM）和氮吸附等温线分析改性半焦的质构特征。改性半焦的 BET 表面积估计为 989.60 m2/g，孔体积为 0.74 cm3/g，孔径为 3.009 nm，微孔体积占 62.44%。发现亚甲基蓝单层吸附容量在 332 K 时为 98 mg/g。改性半焦的吸附容量突出了其适用于液相吸附应用，并有可能用于废水处理。