“…Various peels of biowaste have been used as precursors to produce activated porous carbon, such as mangosteen, cassava, watermelon, onion, orange, lemon, pomelo, garlic, banana [6][7][8][9][10][11][12][13][14][15][16][17][18], coconut [19][20][21][22][23][24], apricot [25][26][27], palm kernel [28][29][30][31][32][33][34], etc. Compared to conventional carbon sources, these biomass materials are copious, natural, and renewable, making them sustainable and inexpensive carbon sources.…”