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Tailoring biochar by PHP towards the oxygenated functional groups(OFGs)-rich surface to improve adsorption performance

引用

Chinese Chemical Letters 2022年第6期33卷 3097-3100页

作者： Xinyue Xiong Zhanglin Liu Li Zhao Mei Huang Lichun Dai Dong Tian Jianmei Zou Yongmei Zeng Jinguang Hu Fei Shen Institute of Ecological and Environmental Sciences Sichuan Agricultural UniversityChengdu 611130China Rural Environment Protection Engineering&Technology Center of Sichuan Province Sichuan Agricultural UniversityChengdu 611130China Key Laboratory of Development and Application of Rural Renewable Energy Biogas Institute of Ministry of Agriculture and Rural AffairsChengdu 610041China Chemical and Petroleum Engineering Schulich School of Engineeringthe University of CalgaryCalgary T2N4H9Canada

In this work,a modification method of H_(3)PO_(4)plus H_(2)O_(2)(PHP)was introduced to targetedly form abundant oxygenated functional groups(OFGs)on biochar,and methylene blue(MB)was employed as a model pollutant for adsorption to reflect the modification *** indicated that parent biochars,especially derived from lower temperatures,substantially underwent oxidative modification by PHP,and OFGs were targetedly ***,approximately 21.5-fold MB adsorption capacity was achieved by PHP-modified biochar comparing with its parent *** evaluate the compatibility of PHP-modification,coefficient of variation(CV)based on MB adsorption capacity by the biochar from various precursors was calculated,in which the CV of PHP-modified biochars was 0.0038 comparing to0.64 of the corresponding parent *** results suggested that the PHP method displayed the excellent feedstock compatibility on biochar *** maximum MB adsorption capacity was454.1 mg/g when the H_(3)PO_(4)and H_(2)O_(2)fraction in PHP were 65.2%and 7.0%;the modification was further intensified by promoting temperature and ***,average 94.5%H_(3)PO_(4)was recovered after 10-batch modification,implying 1.0 kg H_(3)PO_(4)(85%)in PHP can maximally modify 2.37 kg ***,this work offered a novel method to tailor biochar towards OFGs-rich surface for efficient adsorption.

关键词： Biochar Oxidative modification Phosphoric acid Hydrogen peroxide oxygenated functional groups

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