Graphene/hydroxyapatite nano-composite for enhancement of hydrogen productivity from delignified duckweed

Ahmed Tawfik, Xuefei Tan, Mohamed Elsamadony, Muhammad Abdul Qyyum, Ahmed M. Azzam, Muhammad Mubashir, Hui Suan Ng, Muhammad Saeed Akhtar, Kuan Shiong Khoo

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


The incredible growth of the duckweed (DW) in the water ecosystem causes severe environmental problems and reduces biodiversity. Harvesting and valorization of such plants represents a challenge due to its richness with organics. Hydrogen productivity (HP) from dark fermentation of delignified duckweed (DDW) is the main objective of current research. The anaerobes cultures were immobilized on the Graphene/hydroxyapatite nano-composite (nG/HAP) for enhancement of hydrogen yield (HY) and enzymes activities. The HP of 13.5 ± 0.78 mL was obtained from the fermentation of native DW and significantly increased up to 208.9 ± 12.6 mL for delignified one. This was linked to an increase of the hydrogenase enzyme (HE) activities from 0.02 ± 0.0003 to 0.109 ± 0.004 mg M.B reduced/min. The HP was further increased up to 387.1 ± 13.6 mL for batches containing 80 mg/gVS of nG/HAP. nG/HAP inhibited the competitors and promoted the cooperators for the Firmicutes hydrogen producers.
Original languageEnglish (US)
StatePublished - Dec 15 2022
Externally publishedYes

Bibliographical note

Generated from Scopus record by KAUST IRTS on 2023-09-20

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Organic Chemistry
  • General Chemical Engineering
  • Fuel Technology


Dive into the research topics of 'Graphene/hydroxyapatite nano-composite for enhancement of hydrogen productivity from delignified duckweed'. Together they form a unique fingerprint.

Cite this