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Influence of pyrolysis temperature on the characteristics and lead(II) adsorption capacity of phosphorus-engineered poplar sawdust biochar
Journal of Analytical and Applied Pyrolysis ( IF 6 ) Pub Date : 2020-12-30 , DOI: 10.1016/j.jaap.2020.105010
Yonggang Xu , Tianxia Bai , Qiao Li , Hongtao Yang , Yubo Yan , Binoy Sarkar , Su Shiung Lam , Nanthi Bolan

Phosphorus (P)–engineered biochars (BCP) were prepared via co-pyrolysis of poplar sawdust and monopotassium phosphate (KH2PO4) (10 %, w/w) at 300 ℃, 500 ℃ and 700 ℃ to evaluate their potential lead [Pb(II)] adsorption. Effects of pH, contact time, and initial Pb(II) concentration on the Pb(II) adsorption capacity of the biochars were investigated. The physico-chemical, morphological, porous structure, crystallinity and spectroscopic characteristics of pre- and post-Pb-adsorbed biochars were analyzed to unravel the Pb(II) adsorption mechanism. Results showed that KH2PO4 reacted with biomass carbon to form stable C–P and/or C–O–P groups in BCP, and increased carbon retention and aromaticity of BCP. However, the addition of KH2PO4 led to an adverse effect on porous structure, e.g. surface area of biochars produced at 300 ℃, 500 ℃ and 700 ℃ were decreased by 41.53 %, 80.32 %, and 59.74 %, respectively. Adsorption experiments displayed that BCP produced at 300 ℃ exhibited the highest Pb(II) adsorption capacity (qmax = 154.7 mg g−1), which was almost 6 times higher than the pristine biochar (qmax = 24.3 mg g−1). Potassium polymetaphosphate [(KPO3)n] particles were attached on the surface of BCP, which facilitated the precipitation of Pb(II) to form [Pb(PO3)2]n, Pb5(PO4)3OH and PbHPO4. This study thus demonstrated the effect of pyrolysis temperature on the enhancing removal capability of P-modified biochar for Pb(II) from aqueous solutions.



中文翻译:

热解温度对磷工程杨木屑生物炭特性和铅(II)吸附能力的影响

通过在300℃,500℃和700℃下对杨木屑和磷酸一钾(KH 2 PO 4)(10%,w / w)进行共热解制备磷(P)工程生物炭(BCP),以评估其潜在的铅含量[Pb(II)]吸附。研究了pH,接触时间和初始Pb(II)浓度对生物炭对Pb(II)吸附能力的影响。分析了Pb吸附前后的生物炭的理化,形态,多孔结构,结晶度和光谱特性,以阐明Pb(II)的吸附机理。结果表明,KH 2 PO 4与生物量碳发生反应,在BCP中形成稳定的C–P和/或C–O–P基团,并增加了BCP的碳保留和芳香性。但是,添加KH2 PO 4对多孔结构产生不利影响,例如300℃,500℃和700℃产生的生物炭表面积分别减少41.53%,80.32%和59.74%。吸附实验表明,在300℃时产生的BCP表现出最高的Pb(II)吸附容量(q max = 154.7 mg g -1),几乎是原始生物炭(q max = 24.3 mg g -1)的6倍。聚偏磷酸钾[(KPO 3n ]颗粒附着在BCP的表面,促进了Pb(II)的沉淀,形成了[Pb(PO 32 ] n,Pb5(PO 43 OH和PbHPO 4。因此,该研究证明了热解温度对P改性生物炭从水溶液中去除Pb(II)的增强去除能力的影响。

更新日期:2021-01-07
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