Humic acid enhances adsorption effect: Application foundation of high-temperature composting products for remediation of heavy metals pollution

IF 3.7 3区生物学 Q2 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Biochemical Engineering Journal Pub Date : 2024-07-03 DOI:10.1016/j.bej.2024.109415

Feng Ma , Tong Zhu , Youzhao Wang , Xu Li , Mingdong Chang , Chaoyue Zhao , Zhipeng Wang , Haoyu Quan

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Abstract

High-temperature composting products are rich in humic acid, which contains abundant oxygenated functional groups capable of binding to heavy metals, and thus can be considered for remediation of heavy metals pollution. However, the specific adsorption properties of high-temperature composting humic acid (HHA) remain unclear. In this study, humic acid was extracted from composting products using the acid-base extraction method, and the adsorption effect and mechanism were investigated. The experimental results showed that the maximum adsorption capacity of HHA for Cu(II), Zn(II), and Pb(II) was 69.43 mg/g, 58.55 mg/g, and 65.84 mg/g, respectively, representing an average enhancement of 21.80 % compared to conventional composting humic acid. Spectra analysis revealed that the enhanced adsorption mechanism of HHA was mainly due to a 51.63 % increase in hydroxyl and carboxyl groups, which were bound to heavy metals through chelation reactions. Furthermore, kinetics and thermodynamics studies indicated that the adsorption process was an endothermic reaction and predominantly driven by ion exchange. Additionally, the application of high-temperature composting products is economical and feasible due to their production from cheap organic waste. This study aims to demonstrate the superiority of HHA in the adsorption of heavy metals and enhance the comprehension of the adsorption mechanism, which provides an application foundation of composting products for the remediation of heavy metals pollution.

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腐殖酸可增强吸附效果：高温堆肥产品在重金属污染修复中的应用基础

高温堆肥产品富含腐植酸，腐植酸含有丰富的含氧官能团，能够与重金属结合，因此可以考虑用于重金属污染的修复。然而，高温堆肥腐植酸（HHA）的具体吸附特性仍不清楚。本研究采用酸碱萃取法从堆肥产品中提取腐植酸，并对其吸附效果和机理进行了研究。实验结果表明，HHA 对铜（II）、锌（II）和铅（II）的最大吸附容量分别为 69.43 mg/g、58.55 mg/g 和 65.84 mg/g，与传统堆肥腐植酸相比平均提高了 21.80%。光谱分析显示，HHA 的吸附机理增强主要是由于羟基和羧基增加了 51.63%，通过螯合反应与重金属结合。此外，动力学和热力学研究表明，吸附过程是一个内热反应，主要由离子交换驱动。此外，应用高温堆肥产品既经济又可行，因为它们是利用廉价的有机废物生产的。本研究旨在证明 HHA 在重金属吸附方面的优越性，并加深对吸附机理的理解，为堆肥产品在重金属污染修复方面的应用提供基础。

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来源期刊

Biochemical Engineering Journal 工程技术-工程：化工

CiteScore

7.10

自引率

5.10%

发文量

380

审稿时长

34 days

期刊介绍： The Biochemical Engineering Journal aims to promote progress in the crucial chemical engineering aspects of the development of biological processes associated with everything from raw materials preparation to product recovery relevant to industries as diverse as medical/healthcare, industrial biotechnology, and environmental biotechnology. The Journal welcomes full length original research papers, short communications, and review papers* in the following research fields: Biocatalysis (enzyme or microbial) and biotransformations, including immobilized biocatalyst preparation and kinetics Biosensors and Biodevices including biofabrication and novel fuel cell development Bioseparations including scale-up and protein refolding/renaturation Environmental Bioengineering including bioconversion, bioremediation, and microbial fuel cells Bioreactor Systems including characterization, optimization and scale-up Bioresources and Biorefinery Engineering including biomass conversion, biofuels, bioenergy, and optimization Industrial Biotechnology including specialty chemicals, platform chemicals and neutraceuticals Biomaterials and Tissue Engineering including bioartificial organs, cell encapsulation, and controlled release Cell Culture Engineering (plant, animal or insect cells) including viral vectors, monoclonal antibodies, recombinant proteins, vaccines, and secondary metabolites Cell Therapies and Stem Cells including pluripotent, mesenchymal and hematopoietic stem cells; immunotherapies; tissue-specific differentiation; and cryopreservation Metabolic Engineering, Systems and Synthetic Biology including OMICS, bioinformatics, in silico biology, and metabolic flux analysis Protein Engineering including enzyme engineering and directed evolution.