Felipe Augusto Reis Gonçalves, G. Castro, J. Tronto, R. F. Novais
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引用次数: 0
摘要
近年来,旨在减轻环境影响的研究受到重视。使用从热解中获得的生物炭是一种通常直接丢弃在环境中的有机材料回收的替代方案。生物炭具有从废水中回收养分的潜力,在后一种情况下,生物炭的再利用或再循环作为控释肥料可能是一种选择。然而,离子在不同生物炭中的吸附特性尚不清楚。本研究的目的是评价废弃马铃薯生物炭对离子的吸附作用,并对所制备的材料进行物理化学表征。以废弃马铃薯为原料,在450°C N2气氛下热解制备生物炭。为了确定其离子谱,测试了纯生物炭对hn - po4 (3 - n) -、ca2 +、mg2 +、Al 3+的吸附,以及掺入al3 +后生物炭对hn - po4 (3 - n) -的吸附。用去离子水、KCl (1.0 mol·L -1)和Mehlich-1萃取剂洗涤这些离子。在绝对值上,离子的吸附顺序为:Al 3+(酸性pH值下)= ca2 + > Al 3+ > H n PO 4(3 - n) -(掺杂Al 3+的生物炭)> Mg 2+ > H n PO 4(3 - n) -(未掺杂的生物炭)。Al - 3+掺杂生物炭对h_2o_4 (3 - n) -的吸附有积极影响。生物炭具有优先吸附阳离子的特性,掺杂工艺有利于吸附阴离子。
Ionic adsorption and characterization of biochar from discarded potatoes
: Studies aimed at mitigating environmental impacts have received attention in recent years. The use of biochar obtained from the pyrolysis is an alternative for the recovery of organic materials that usually are directly discarded in the environment. Biochar has the potential to recover nutrients from wastewater, and in the latter case, the reuse or recycling of biochar as a controlled-release fertilizer could be an option. However, the adsorption characteristics of the ions into different biochars have not been known. The aim of this study was to evaluate the ions adsorption in biochar derived from discarded potatoes, as well as to make physical and chemical characterization of the produced materials. The biochar derived from discarded potatoes was produced by pyrolysis at 450 °C under an N2 atmosphere. In order to define its ionic profile, the adsorption of H n PO 4(3–n)– , Ca 2+ , Mg 2+ , and Al 3+ was tested in pure biochar, as well as adsorption of H n PO 4(3–n)– in biochar after it was doped with Al 3+ . The desorption of these ions was tested by washing with deionized water, and the KCl (1.0 mol·L –1 ) and Mehlich-1 extractors. In absolute values, the adsorption order of the ions was Al 3+ (in acid pH value) = Ca 2+ > Al 3+ > H n PO 4(3–n)– (biochar doped with Al 3+ ) > Mg 2+ > H n PO 4(3–n)– (biochar without doping). The adsorption of H n PO 4(3–n)– was positively influenced by the doping of biochar with Al 3+ . The biochar has preferential characteristics for cations adsorption, and the doping process can aid in adsorption of anions.
期刊介绍:
Bragantia é uma revista de ciências agronômicas editada pelo Instituto Agronômico da Agência Paulista de Tecnologia dos Agronegócios, da Secretaria de Agricultura e Abastecimento do Estado de São Paulo, com o objetivo de publicar trabalhos científicos originais que contribuam para o desenvolvimento das ciências agronômicas.
A revista é publicada desde 1941, tornando-se semestral em 1984, quadrimestral em 2001 e trimestral em 2005.
É filiada à Associação Brasileira de Editores Científicos (ABEC).