Versatile silicate-modified hydrochar based on Scutellaria baicalensis-residue for efficiently removing heavy metal-antibiotic co-contamination and relevant bio-contaminants from wastewater

IF 5.6 1区农林科学 Q1 AGRICULTURAL ENGINEERING

Industrial Crops and Products Pub Date : 2024-11-04 DOI:10.1016/j.indcrop.2024.119873

Yaozu Mi , Shuo Zhang , Haohao Yan , Genji Yang , Hua Yang , Yang Zhou , Lei Miao , Xinyan Gao , Yaqi Hong , Hailian Zang , Chunyan Li

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引用次数: 0

Abstract

In this study, we utilized typical Chinese medicine herbal residues (CMHRs)－Scutellaria baicalensis (Scutellaria baicalensis Georgi) residue (SR), as the raw material and employed Na₂SiO₃ and Fe₂(SO₄)₃ as modifying agents to fabricate a novel and multifunctional hydrochar (FeSi-SRHC), which was designed for comprehensive removal of typical contaminants such as Cu²⁺, Zn²⁺, tetracycline (TC), and ciprofloxacin (CIP), along with relevant bio-contaminants (resistant bacteria (RBs) and resistance genes (RGs)) present in wastewater. Based on the analysis of adsorption kinetics and Freundlich isotherm, it was found that FeSi-SRHC exhibited physical monolayer adsorption for Cu²⁺/Zn²⁺ while mainly chemical multilayer adsorption for TC/CIP in single-contamination system. Furthermore, Langmuir isotherm demonstrated excellent adsorption capacity of FeSi-SRHC towards Cu²⁺/Zn²⁺/TC/CIP with maximum capacities of 255.75, 265.26, 425.53, and 404.86 mg/g, respectively. In the co-contamination system, the presence of Cu²⁺, Zn²⁺, TC, and CIP exhibited varying degrees of inhibitory or promotive effects on the mutual adsorption by FeSi-SRHC. This divergence stemmed from differences in complexation intensities and concentration ratios among diverse co-existing contaminants. Based on XPS and Density Functional Theory (DFT) analyses, the adsorption process for Cu²⁺, Zn²⁺, TC, and CIP by FeSi-SRHC primarily involves pore fill, complexation reactions, ion exchange, hydrogen bonding, π-π stacking interactions, and electrostatic interactions. Bio-contaminant removal experiments revealed that the release of baicalin and wogonoside from FeSi-SRHC disrupts the structure of RBs cells and compromises the integrity of resistance plasmids. The practical application experiment showed that FeSi-SRHC displayed favorable performance for removing heavy metals, antibiotics, and bio-contaminants in actual wastewater. This study presented a “Treating waste with waste” strategy, which provided a method with low carbon, eco-friendly, and inexpensive for CMHRs resources and turning waste into treasure while proposing a idea to address the challenges associated with treating heavy metal, antibiotic, and bio-contaminant contamination in wastewater.

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基于黄芩残基的多功能硅酸盐改性水炭，用于高效去除废水中的重金属-抗生素共污染和相关生物污染物

本研究以典型的中药渣（CMHRs）--黄芩（Scutellaria baicalensis Georgi）渣（SR）为原料，采用 Na2SiO3 和 Fe2(SO4)3 作为改性剂，制备了一种新型多功能水炭（FeSi-SRHC）、设计用于全面去除废水中的典型污染物，如 Cu2+、Zn2+、四环素（TC）和环丙沙星（CIP），以及相关的生物污染物（抗性细菌（RBs）和抗性基因（RGs））。根据吸附动力学和 Freundlich 等温线分析发现，在单一污染体系中，FeSi-SRHC 对 Cu2+/Zn2+ 表现出物理单层吸附，而对 TC/CIP 则主要表现出化学多层吸附。此外，Langmuir 等温线表明 FeSi-SRHC 对 Cu2+/Zn2+/TC/CIP 具有出色的吸附能力，最大吸附容量分别为 255.75、265.26、425.53 和 404.86 mg/g。在共污染体系中，Cu2+、Zn2+、TC 和 CIP 的存在对 FeSi-SRHC 的相互吸附有不同程度的抑制或促进作用。这种差异源于各种共存污染物之间络合强度和浓度比的不同。根据 XPS 和密度泛函理论（DFT）分析，FeSi-SRHC 对 Cu2+、Zn2+、TC 和 CIP 的吸附过程主要涉及孔隙填充、络合反应、离子交换、氢键、π-π 堆积相互作用和静电作用。生物污染物去除实验表明，FeSi-SRHC 释放的黄芩苷和乌药苷会破坏 RBs 细胞的结构，损害抗性质粒的完整性。实际应用实验表明，FeSi-SRHC 在去除实际废水中的重金属、抗生素和生物污染物方面表现出良好的性能。该研究提出了一种 "以废治废 "的策略，为 CMHRs 资源化和变废为宝提供了一种低碳、环保、廉价的方法，同时为解决废水中重金属、抗生素和生物污染物污染的处理难题提出了一种思路。

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来源期刊

Industrial Crops and Products 农林科学-农业工程

CiteScore

9.50

自引率

8.50%

发文量

1518

审稿时长

43 days

期刊介绍： Industrial Crops and Products is an International Journal publishing academic and industrial research on industrial (defined as non-food/non-feed) crops and products. Papers concern both crop-oriented and bio-based materials from crops-oriented research, and should be of interest to an international audience, hypothesis driven, and where comparisons are made statistics performed.