Influence of pyrolysis temperature on characteristics and phosphate adsorption capability of biochar derived from waste-marine macroalgae (Undaria pinnatifida roots).
The collected roots of Undaria pinnatifida, the main waste in farming sites, accounting for 40-60% of annual production, was pyrolyzed under temperature ranging from 200 to 800°C to evaluate the influence of pyrolysis temperature on biochar properties and phosphate adsorption capacity. It was confirmed that an increase in the pyrolysis temperature led to a decrease of the yield of biochar, while ash content remained almost due to carbonization followed by mineralization. Elemental analysis results indicated an increase in aromaticity and decreased polarity at a high pyrolysis temperature. When the pyrolysis temperature was increased up to 400°C, the phosphate adsorption capacity was enhanced, while a further increase in the pyrolysis temperature lowered the adsorption capacity due to blocked pores in the biochar during pyrolysis. Finally, a pot experiment revealed that biochar derived from waste-marine macroalgae is a potent and eco-friendly alternative material for fertilizer after phosphate adsorption.
Center for Water Resources Cycle Research, Korea Institute of Science and Technology, P.O. Box 131, Cheongryang, Seoul 130-650, South Korea.
Kyung-Won
KW
Jung
Environmental Business Team, R&D Division, KG Chemical, Sihwa Industrial Complex 1Da 106, 5, Somanggongwon-ro, Siheung-si, Gyeonggi-do 429-848, South Korea.
Kipal
K
Kim
Center for Water Resources Cycle Research, Korea Institute of Science and Technology, P.O. Box 131, Cheongryang, Seoul 130-650, South Korea.
Tae-Un
TU
Jeong
Center for Water Resources Cycle Research, Korea Institute of Science and Technology, P.O. Box 131, Cheongryang, Seoul 130-650, South Korea. Electronic address: khahn@kist.re.kr.
Kyu-Hong
KH
Ahn
D000327:Adsorption; D017756:Aquaculture / Q000379:methods; D002244:Carbon; D002606:Charcoal / Q000032:analysis / Q000737:chemistry*; D004553:Electric Conductivity; D005308:Fertilizers; D006358:Hot Temperature; D006863:Hydrogen-Ion Concentration; D010710:Phosphates / Q000737:chemistry; D018517:Plant Roots / Q000737:chemistry; D012624:Seaweed / Q000737:chemistry*; D044648:Undaria / Q000737:chemistry*; D018505:Waste Management / Q000379:methods*
D005308:Fertilizers; D010710:Phosphates; C540010:biochar; D002606:Charcoal; D002244:Carbon
Biochar; Marine macroalgae; Phosphate; Pyrolysis; Undaria pinnatifida roots