- Title
- Enhanced removal of As (III) and As (V) from groundwater with rGO@Burkholderia cepacian
- Creator
- Zhao, Zhihao; Cheng, Ying; Li, Jiabing; Chen, Zuliang
- Relation
- Journal of Environmental Chemical Engineering Vol. 12, Issue 5, no. 113599
- Publisher Link
- http://dx.doi.org/10.1016/j.jece.2024.113599
- Publisher
- Netherlands
- Resource Type
- journal article
- Date
- 2024
- Description
- Arsenic (As) species in groundwater pose a major global environmental concern. Bioremediation, as a detoxifying mechanism for As, holds considerable importance in addressing the As contamination. In the current study, the fungus Burkholderia cepacia (BK) was successfully immobilized to increase the elimination of As (III) and As(V) from aqueous solutions using reduced graphene oxide (rGO) produced using green tea extract (GT). The removal efficiency of BK alone for As (III) was only 48.87 %, and the composite rGO@BK can enhance the removal efficiency of As(III) by 11.3 %. In addition, the rGO@BK also enhances the removal efficiency of As(V), which the removal efficiency of As(V) can achieve to 79.04 %, 24.79 % increase compared to BK alone (54.25 %). Scanning electron microscopy (SEM) and scanning electron microscopy (CLSM) showed that the extracellular polymeric substances (EPS) were numerous and uniformly dispersed on the rGO surface, which also indicated that the BK was firmly bound to the surface. Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) analyses confirmed that EPS contains a significant number of functional groups, which are involved in As biosorption through complexation. Three-dimensional excitation-emission matrix (3D-EEM) analysis showed that 3D-EEM indicated that EPS mainly contained tryptophan and humic acid analogs, in which humic acid plays an important role in the redox reaction of arsenic. Electrochemical techniques confirm the function of rGO as a potential electron shuttler. Furthermore, rGO@BK showed significant removal efficiency of both As(III) (44.4 %) and As (V) (98.9 %) in groundwater, which indicate rGO@BK holds great potential in detoxification of As contamination.
- Subject
- biological immobilization; bio-reduction; biosorption; arsenic; SDG 6; SDG 15; Sustainable Development Goal
- Identifier
- http://hdl.handle.net/1959.13/1508947
- Identifier
- uon:56167
- Identifier
- ISSN:2213-3437
- Language
- eng
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