In situ growth of ZIF-67 onto bamboo pulp black liquor porous carbons as an efficient adsorbent for malachite green removal

Porous carbon is one of the most commonly used adsorbent and catalyst carrier material, but porous carbon alone has relatively poor adsorption and degradation effect on dyes. In this work, porous carbon (PC) was prepared from black liquor of bamboo pulp and trace amount of zeolitic imidazolate framework-67 (ZIF-67) was loaded onto PC and subsequently calcined under nitrogen atmosphere. Co and N elements are dispersed on the surface of the obtained material (ZIF-67/PC@C). Besides, ZIF-67/PC@C also exhibits weak magnetic property. The ZIF-67/PC@C was further used as adsorbent for malachite green (MG) and as catalyst to activate peroxymonosulfate (PMS) for MG degradation. It is found that ZIF-67/PC@C exhibits good adsorption performances for MG with a maximum adsorption capacity of 1808 mg/g, which is much higher than that of PC (1277 mg/g). In addition, ZIF-67/PC@C shows high activity for effective activation of PMS to produce hydroxyl radical（ · OH) sulfate radicals (SO 4 - · ）and singlet oxygen ( 1 O 2 ) for oxidative degradation of MG.