Magnesium activation affects the properties and phosphate sorption capacity of poultry litter biochar

IF 13.1 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES
Biochar Pub Date : 2023-10-07 DOI:10.1007/s42773-023-00263-5
Joshua T. Padilla, Donald W. Watts, Jeffrey M. Novak, Vasile Cerven, James A. Ippolito, Ariel A. Szogi, Mark G. Johnson
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Abstract

Abstract Biochars with a high affinity for phosphorus (P) are promising soil amendments for reducing P in agricultural runoff. Poultry litter (PL) is an abundant biochar feedstock. However, PL-derived biochars are typically high in soluble P and therefore require chemical modification to become effective P sorbents. This study investigated the effect of magnesium (Mg) activation on extractable P (EP) and P sorption capacities of PL-derived biochars. Biochar was produced at 500–900 °C from PL activated with 0–1 M Mg. Three differentially aged PL feedstocks were evaluated (1-, 3–5-, and 7–9-year-old). Increased Mg activation level and pyrolysis temperature both resulted in EP reductions from the biochars. Specifically, biochars produced at temperatures ≥ 700 °C from PL activated with ≥ 0.25 M Mg had negligible EP. X-ray diffractograms indicated that increased Mg loading favored the formation of stable Mg 3 (PO 4 ) 2 phases while increasing temperature favored the formation of both Mg 3 (PO 4 ) 2 and Ca 5 (PO 4 ) 3 OH. Maximum P sorption capacities (P max ) of the biochars were estimated by fitting Langmuir isotherms to batch sorption data and ranged from 0.66–10.35 mg g −1 . Average P max values were not affected by PL age or pyrolysis temperature; however, biochars produced from 1 M Mg-activated PL did have significantly higher average P max values ( p < 0.05), likely due to a greater abundance of MgO. Overall, the results demonstrated that Mg activation is an effective strategy for producing PL-derived biochars with the potential ability to reduce P loading into environmentally sensitive ecosystems.

Abstract Image

镁活化对禽畜凋落物生物炭的性能和磷酸盐吸附能力有影响
生物炭对磷具有较高的亲和力,是一种很有前途的土壤改良剂,可以减少农业径流中的磷。家禽粪便是一种丰富的生物炭原料。然而,pl衍生的生物炭通常富含可溶性磷,因此需要化学改性才能成为有效的磷吸附剂。研究了镁(Mg)活化对pl衍生生物炭可提取P (EP)和P吸附能力的影响。用0-1 Mg活化的PL在500-900°C下制备生物炭。评估了三种不同年龄的PL原料(1岁,3-5岁和7 - 9岁)。Mg活化水平的提高和热解温度的升高均导致生物炭的EP降低。具体来说,在≥700°C的温度下,由≥0.25 M Mg活化的PL产生的生物炭的EP可以忽略不计。x射线衍射图表明,增加Mg负载有利于形成稳定的mg3 (po4) 2相,而增加温度有利于形成mg3 (po4) 2和ca5 (po4) 3 OH。通过拟合Langmuir等温线估计了生物炭的最大磷吸附量(P max),其范围为0.66 ~ 10.35 mg g−1。平均P最大值不受PL年龄和热解温度的影响;然而,由1 M mg活化的PL生产的生物炭确实具有显著更高的平均P最大值(P <0.05),可能是由于MgO的丰度更高。总体而言,研究结果表明,Mg活化是生产pl衍生生物炭的有效策略,具有减少环境敏感生态系统中磷负荷的潜在能力。
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来源期刊
Biochar
Biochar Multiple-
CiteScore
18.60
自引率
10.20%
发文量
61
期刊介绍: Biochar stands as a distinguished academic journal delving into multidisciplinary subjects such as agronomy, environmental science, and materials science. Its pages showcase innovative articles spanning the preparation and processing of biochar, exploring its diverse applications, including but not limited to bioenergy production, biochar-based materials for environmental use, soil enhancement, climate change mitigation, contaminated-environment remediation, water purification, new analytical techniques, life cycle assessment, and crucially, rural and regional development. Biochar publishes various article types, including reviews, original research, rapid reports, commentaries, and perspectives, with the overarching goal of reporting significant research achievements, critical reviews fostering a deeper mechanistic understanding of the science, and facilitating academic exchange to drive scientific and technological development.
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