Cadmium and lead adsorption and desorption by coffee waste-derived biochars

IF 1.2 4区 农林科学 Q2 AGRICULTURE, MULTIDISCIPLINARY Bragantia Pub Date : 2022-01-01 DOI:10.1590/1678-4499.20210142
Ruan Carnier, A. Coscione, Cleide Aparecida de Abreu, L. C. A. Melo, Andressa Ferreira da Silva
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引用次数: 7

Abstract

: Biochar derived from coffee waste has been reported as a promising material for heavy metal sorption. However, if the intended use is environmental remediation, knowing the extent to which desorption may occur is critical. Thus, the objective of this work was to evaluate the efficiency of spent coffee ground (SCG) and coffee parchment (CP) biochars pyrolyzed at 700 °C under laboratory conditions, in the sorption of Cd and Pb from aqueous solutions, in a pH range from 2 to 10, and their retention after an induced desorption process with a 2.9 pH acetic acid solution. Both biochars were alkaline, and the initial pH of the solution had a large effect on the sorption capacity of SCG but a small effect on the sorption capacity of CP. The Pb sorption capacity was higher for CP (18.6 mg∙g –1 ) than for SCG (11.4 mg∙g –1 ), while both biochars had low Cd retention capacities (1.18 mg∙g –1 ). Coffee parchment also showed the highest Pb retention (30% to 87%), while for Cd there was no difference between CP and SCG biochars. Our results showed that metal precipitation was the main mechanism for metal immobilization and CP biochar proved to be more reliable than SCG, mainly for Pb, due to its higher sorption capacity and lower metal release by desorption than SCG. These characteristics are particularly important for the use of biochar in environmental remediation. Besides that, the biochar production represents an eco-friendly destination for these feedstocks, contributing to the circular economy.
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咖啡废弃物生物炭对镉和铅的吸附和解吸
据报道,从咖啡废料中提取的生物炭是一种很有前途的重金属吸附材料。然而,如果预期用途是环境补救,了解解吸可能发生的程度是至关重要的。因此,本研究的目的是评估在实验室条件下,在700°C下热解的废咖啡渣(SCG)和咖啡羊皮纸(CP)生物炭在pH范围为2至10的水溶液中吸附Cd和Pb的效率,以及在pH为2.9的乙酸溶液中诱导解吸后的保留率。两种生物炭均为碱性,溶液初始pH对SCG的吸附容量影响较大,对CP的吸附容量影响较小,CP的Pb吸附容量(18.6 mg∙g -1)高于SCG (11.4 mg∙g -1),而两种生物炭的Cd保留容量均较低(1.18 mg∙g -1)。咖啡羊皮纸的Pb保留率最高(30% ~ 87%),而CP和SCG生物炭的Cd保留率无显著差异。结果表明,金属沉淀是金属固定的主要机制,CP生物炭比SCG更可靠,主要是对Pb,因为它的吸附能力比SCG高,解吸时金属释放量比SCG低。这些特性对于生物炭在环境修复中的应用尤为重要。除此之外,生物炭生产代表了这些原料的环保目的地,有助于循环经济。
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来源期刊
Bragantia
Bragantia AGRICULTURE, MULTIDISCIPLINARY-
CiteScore
2.40
自引率
8.30%
发文量
33
审稿时长
4 weeks
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).
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