用工业碱木素单锅合成具有卓越铅(II)固定能力的生物炭

IF 4.2 2区 化学 Q2 BIOCHEMISTRY & MOLECULAR BIOLOGY Molecules Pub Date : 2024-09-11 DOI:10.3390/molecules29184310
Jiale Li, Taoze Liu, Zhanghong Wang
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引用次数: 0

摘要

本研究以 IALG 为原料,通过单锅热解工艺合成了生物炭。研究人员对所得生物炭(IALG-BC)的理化性质进行了表征,并将其与去掉灰分的酸处理木质素所得生物炭(A-IALG-BC)的理化性质进行了比较。本研究进一步探讨了这两种木质素基生物炭对铅(II)的吸附性能和机制。结果表明,IALG 中的高灰分(主要由 Na 组成)在热解过程中起到了有效催化剂的作用,降低了活化能,并促进了所得生物炭(IALG-BC)孔隙结构的发展。此外,热解后,与 Na 有关的矿物质转化为大小在 80 至 150 nm 之间的颗粒物质,这些颗粒物质成为有效固定铅(II)的活性吸附位点。吸附结果表明,IALG-BC 对铅(II)的吸附性能明显优于 A-IALG-BC。根据 Langmuir 模型得出,IALG-BC 对铅(II)的理论最大吸附容量为 809.09 mg/g,约为 A-IALG-BC 的 40 倍。此外,IALG-BC 对铅(II)的吸附平衡可在大约 0.5 小时内达到,而 A-IALG-BC 则需要 2 小时以上。
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One-Pot Synthesis of Biochar from Industrial Alkali Lignin with Superior Pb(II) Immobilization Capability
This study synthesized biochar through a one-pot pyrolysis process using IALG as the raw material. The physicochemical properties of the resulting biochar (IALG-BC) were characterized and compared with those of biochar derived from acid-treated lignin with the ash component removed (A-IALG-BC). This study further investigated the adsorption performances and mechanisms of these two lignin-based biochars for Pb(II). The results revealed that the high ash content in IALG, primarily composed of Na, acts as an effective catalyst during pyrolysis, reducing the activation energy and promoting the development of the pore structure in the resulting biochar (IALG-BC). Moreover, after pyrolysis, Na-related minerals transformed into particulate matter sized between 80 and 150 nm, which served as active adsorption sites for the efficient immobilization of Pb(II). Adsorption results demonstrated that IALG-BC exhibited a significantly superior adsorption performance for Pb(II) compared to that of A-IALG-BC. The theoretical maximum adsorption capacity of IALG-BC for Pb(II), derived from the Langmuir model, was determined to be 809.09 mg/g, approximately 40 times that of A-IALG-BC. Additionally, the adsorption equilibrium for Pb(II) with IALG-BC was reached within approximately 0.5 h, whereas A-IALG-BC required more than 2 h. These findings demonstrate that the presence of inorganic mineral components in IALG plays a crucial role in its resource utilization.
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来源期刊
Molecules
Molecules 化学-有机化学
CiteScore
7.40
自引率
8.70%
发文量
7524
审稿时长
1.4 months
期刊介绍: Molecules (ISSN 1420-3049, CODEN: MOLEFW) is an open access journal of synthetic organic chemistry and natural product chemistry. All articles are peer-reviewed and published continously upon acceptance. Molecules is published by MDPI, Basel, Switzerland. Our aim is to encourage chemists to publish as much as possible their experimental detail, particularly synthetic procedures and characterization information. There is no restriction on the length of the experimental section. In addition, availability of compound samples is published and considered as important information. Authors are encouraged to register or deposit their chemical samples through the non-profit international organization Molecular Diversity Preservation International (MDPI). Molecules has been launched in 1996 to preserve and exploit molecular diversity of both, chemical information and chemical substances.
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