Biotoxicity assessment and lignocellulosic structural changes of phosphoric acid pre-treated young coconut husk hydrolysate for biohydrogen production

Shalini Narayanan Arisht, Peer Mohamed Abdul, Chun Min Liu, Sheng Kai Lin, Rizal Muzhafar Maaroff, Shu Yii Wu, Jamaliah Md Jahim

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Major sugar constituents in young coconut husk were found to be glucans (0.30 g/g husk), while xylans were 0.10 g/g husk. Pre-treatments were carried out using phosphoric acid with dried coconut husk powder under steam heating. The effect of phosphoric acid on coconut husk hydrolysis was observed using acid concentrations of 0%, 1%, 5% and 10% (v/v). Soluble sugar concentration in hydrolysate was increasing proportional to acid concentration, as the total recovered solid decreases. FTIR and XRD analysis showed that acid hydrolysis led to the disruption of internal chemical bonds, causing coconut husk structural sugars to be released into the hydrolysate. Highest soluble sugar concentration, 29.9 g/L with a total suspended solid of 75.1 g/L, was obtained when the coconut husk was pre-treated with 10% phosphoric acid, and can be utilised for biohydrogen fermentation. Biotoxicity testing of the hydrolysates shows that half-maximal inhibition concentration of phosphoric acid was around 4.41% for a 24-h incubation and 3.80% for a 96-h incubation.

Original languageEnglish
Pages (from-to)5830-5843
Number of pages14
JournalInternational Journal of Hydrogen Energy
Volume44
Issue number12
DOIs
Publication statusPublished - 1 Mar 2019

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phosphoric acid
Phosphoric acid
Sugars
sugars
Acids
Hydrolysis
acids
hydrolysis
Chemical bonds
fermentation
Fermentation
chemical bonds
Steam
steam
pretreatment
Heating
Powders
Testing
heating

Keywords

  • Biohydrogen
  • Cocos nucifera
  • EC
  • Hydrolysate
  • Phosphoric acid
  • Toxicity

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

Cite this

Biotoxicity assessment and lignocellulosic structural changes of phosphoric acid pre-treated young coconut husk hydrolysate for biohydrogen production. / Arisht, Shalini Narayanan; Abdul, Peer Mohamed; Liu, Chun Min; Lin, Sheng Kai; Maaroff, Rizal Muzhafar; Wu, Shu Yii; Md Jahim, Jamaliah.

In: International Journal of Hydrogen Energy, Vol. 44, No. 12, 01.03.2019, p. 5830-5843.

Research output: Contribution to journalArticle

Arisht, Shalini Narayanan ; Abdul, Peer Mohamed ; Liu, Chun Min ; Lin, Sheng Kai ; Maaroff, Rizal Muzhafar ; Wu, Shu Yii ; Md Jahim, Jamaliah. / Biotoxicity assessment and lignocellulosic structural changes of phosphoric acid pre-treated young coconut husk hydrolysate for biohydrogen production. In: International Journal of Hydrogen Energy. 2019 ; Vol. 44, No. 12. pp. 5830-5843.
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