4.8 Article

Increasing straw surface functionalities for enhanced adsorption property

Journal

BIORESOURCE TECHNOLOGY
Volume 320, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2020.124393

Keywords

Straw; Dye; Adsorption; Modification; Wastewater treatment; Surface functional group

Funding

  1. Australia-China Joint Research Centre - Healthy Soils for Sustainable Food Production and Environmental Quality [ACSRF48165]
  2. Cooperative Research Centres Projects (CRC-P) 'Optimising Nitrogen Recovery from Livestock Waste for Multiple Production and Environmental Benefits
  3. National Natural Science Foundation of China [22002032]
  4. Hebei Key RD Program [20327303D, 19223811D]
  5. Natural Science Foundation of Hebei province [B2019201064]
  6. Advanced Talents Incubation Program of the Hebei University [1081/801260201284]

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The study demonstrates that low-temperature partial oxidation is an effective method for modifying reed straw, increasing methylene blue adsorption and removal efficiency, with a high yield, offering a new sustainable environmental management technology. A linear correlation exists between oxygen content and methylene blue adsorption at different modification temperatures, but under high temperature conditions, pore blockage and competition with metallic cations need to be considered.
A simple low-temperature partial-oxidation process was demonstrated as an effective technology for reed straw modification towards environmental remediation. At an optimal temperature of 180 degrees C, the straw materials exhibited a remarkable colour change from light yellow to dark brown, increased methylene blue (MB) uptake by 1.8 times, enhanced removal efficiency from 34.5% to 92.8%, and a high yield of 77.2%. Spectroscopic characterization and Boehm titration proved that the amount of surface oxygen (O)-containing functional groups significantly increased after modification. A strong linear correlation (R-2 = 0.93) existed between total amounts of O-containing functional groups and MB uptake for modification temperatures below 180 degrees C, whereas blockage of the pore entrances and competition with metallic cations must be taken into account for samples generated from excess heating (>180 degrees C). These results provided insights into designing promising technologies for sustainable environmental management through reutilization of agricultural waste.

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