The use of zero-valent iron (ZVI) on water remediation applications has not been fully explored because of its agglomeration and rapid passivation. Biochar has been widely used to provide the stability to ZVI by preventing its agglomeration. Herein, bamboo char supported ZVI (BC-ZVI) were synthesized via an in-situ thermal conversion of iron (III) chloride loaded bamboo char, which is iron chloride as a Fe source and bamboo as a carbon source. Different parameters such as temperature, iron loading, and type of iron salt were analyzed throughout the study and the best performance was obtained for the BC-ZVI prepared at 1000 °C with 15% iron loading using FeCl2. These particles exhibited high maximum Langmuir adsorption capacities of 100.4, and 63.9 mg/g for Cu(II), and Pb(II) respectively. Fe utilization ratio of BC-ZVI was increased from 5 to 30 after the pretreatment of bamboo at 600 °C for 1h. The structure and morphological studies indicated that these particles were sized 1-3 µm in diameter. These particles could be promising renewable adsorbents that will be an alternative green synthesis path to ZVI adsorbents produced using hazardous chemicals such as sodium borohydride (NaBH4).

Bamboo Char supported zero-valent (BC-ZVI) iron for water remediation

ACS Spring 2022

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