Dilute sulfuric acid hydrolysis of red macroalgae Eucheuma denticulatum with microwave-assisted heating for biochar production and sugar recovery

Yong Yi Teh, Keat Teong Lee, Wei-Hsin Chen, Shih Cheng Lin, Herng Kuang Sheen, Inn Shi Tan

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

This study aims to produce biochar and sugars from a macroalga Eucheuma denticulatum using dilute sulfuric acid hydrolysis along with microwave-assisted heating. The reactions were operated at sulfuric acid concentrations of 0.1 and 0.2 M, reaction temperatures of 150–170 °C and a heating time of 10 min. Compared to the raw macroalga, biochar qualities were improved with increased carbon content and lower ash and moisture contents. The calorific value of the biochar could be intensified up to 45%, and 39% of energy yield was recovered. Apart from producing biochar, the highest total reducing sugars were 51.47 g/L (74.84% yield) along with a low by-product 5-HMF of 0.20 g/L, when the biomass was treated under the optimum conditions at 160 °C with 0.1 M H2SO4. Thus, this study demonstrated that macroalgae could be potentially used as biomass feedstock under microwave-assisted acid hydrolysis for the production of biofuel and value-added products.

Original languageEnglish
Pages (from-to)20-27
Number of pages8
JournalBioresource Technology
Volume246
DOIs
Publication statusPublished - 2017 Dec 1

Fingerprint

macroalga
Sulfuric acid
Sugars
sulfuric acid
hydrolysis
Hydrolysis
sugar
Biomass
Microwaves
heating
Heating
Recovery
Calorific value
biomass
Biofuels
Ashes
biofuel
Feedstocks
Coal ash
Byproducts

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

Cite this

Teh, Yong Yi ; Lee, Keat Teong ; Chen, Wei-Hsin ; Lin, Shih Cheng ; Sheen, Herng Kuang ; Tan, Inn Shi. / Dilute sulfuric acid hydrolysis of red macroalgae Eucheuma denticulatum with microwave-assisted heating for biochar production and sugar recovery. In: Bioresource Technology. 2017 ; Vol. 246. pp. 20-27.
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Dilute sulfuric acid hydrolysis of red macroalgae Eucheuma denticulatum with microwave-assisted heating for biochar production and sugar recovery. / Teh, Yong Yi; Lee, Keat Teong; Chen, Wei-Hsin; Lin, Shih Cheng; Sheen, Herng Kuang; Tan, Inn Shi.

In: Bioresource Technology, Vol. 246, 01.12.2017, p. 20-27.

Research output: Contribution to journalArticle

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AB - This study aims to produce biochar and sugars from a macroalga Eucheuma denticulatum using dilute sulfuric acid hydrolysis along with microwave-assisted heating. The reactions were operated at sulfuric acid concentrations of 0.1 and 0.2 M, reaction temperatures of 150–170 °C and a heating time of 10 min. Compared to the raw macroalga, biochar qualities were improved with increased carbon content and lower ash and moisture contents. The calorific value of the biochar could be intensified up to 45%, and 39% of energy yield was recovered. Apart from producing biochar, the highest total reducing sugars were 51.47 g/L (74.84% yield) along with a low by-product 5-HMF of 0.20 g/L, when the biomass was treated under the optimum conditions at 160 °C with 0.1 M H2SO4. Thus, this study demonstrated that macroalgae could be potentially used as biomass feedstock under microwave-assisted acid hydrolysis for the production of biofuel and value-added products.

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