Green Treatment of Phosphate from Wastewater Using a Porous Bio-Templated Graphene Oxide/MgMn-Layered Double Hydroxide Composite

Yi-Ting Lai; Yu-Sheng Huang; Chin-Hsuan Chen; Yan-Cheng Lin; Horng-Tay Jeng; Min-Chao Chang; Lih-Juann Chen; Chi-Young Lee; Po-Chun Hsu; Nyan-Hwa Tai

doi:10.1016/j.isci.2020.101065

Green Treatment of Phosphate from Wastewater Using a Porous Bio-Templated Graphene Oxide/MgMn-Layered Double Hydroxide Composite

iScience. 2020 May 22;23(5):101065. doi: 10.1016/j.isci.2020.101065. Epub 2020 Apr 18.

Authors

Affiliations

¹ Department of Materials Science and Engineering, National Tsing-Hua University, Hsinchu, Taiwan 30013, Republic of China; Department of Mechanical Engineering and Materials Science, Duke University, Durham, NC 27708, USA.
² Department of Materials Science and Engineering, National Tsing-Hua University, Hsinchu, Taiwan 30013, Republic of China.
³ Department of Physics, National Tsing-Hua University, Hsinchu, Taiwan 30013, Republic of China.
⁴ Department of Physics, National Tsing-Hua University, Hsinchu, Taiwan 30013, Republic of China; Physics Division, National Center for Theoretical Sciences, Hsinchu, Taiwan 30013, Republic of China; Institute of Physics, Academia Sinica, Taipei, Taiwan 11529, Republic of China.
⁵ Material and Chemical Research Laboratories, Industrial Technology Research Institute, Hsinchu Taiwan 30011, Republic of China.
⁶ Department of Mechanical Engineering and Materials Science, Duke University, Durham, NC 27708, USA. Electronic address: pochun.hsu@duke.edu.
⁷ Department of Materials Science and Engineering, National Tsing-Hua University, Hsinchu, Taiwan 30013, Republic of China. Electronic address: nhtai@mx.nthu.edu.tw.

Abstract

Excessive phosphorus in water is the primary culprit for eutrophication, which causes approximately $2.2 billion annual economic loss in the United States. This study demonstrates a phosphate-selective sustainable method by adopting Garcinia subelliptica leaves as a natural bio-template, where MgMn-layered double hydroxide (MgMn-LDH) and graphene oxide (GO) can be grown in situ to obtain L-GO/MgMn-LDH. After calcination, the composite shows a hierarchical porous structure and selective recognition of phosphate, which achieves significantly high and recyclable selective phosphate adsorption capacity and desorption rate of 244.08 mg-P g^-1 and 85.8%, respectively. The detail variation of LDHs during calcination has been observed via in situ transmission electron microscope (TEM). Moreover, the roles in facilitating phosphate adsorption and antimicrobial ability of chemical constituents in Garcinia subelliptica leaves, biflavonoids, and triterpenoids have been investigated. These results indicate the proposed bio-templated adsorbent is practical and eco-friendly for phosphorus sustainability in commercial wastewater treatment.

Keywords: Environmental Chemical Engineering; Green Chemistry; Natural Material.