Journal of Radiation Research and Radiation Processing, Volume. 42, Issue 4, 040402(2024)
Enhancement of anaerobic fermentation performance of polylactic acid by 60Co-γ ray irradiation pretreatment
Figures & Tables(11)
Fig. 1. FTIR spectra of PLA samples with different absorbed doses after irradiation (color online)
Fig. 2. TGA curves of PLA samples with different absorbed doses (color online)
Fig. 3. DTG curves of PLA samples with different absorbed doses (color online)
Fig. 4. Lactate concentration of PLA samples under different absorption doses during enzymatic hydrolysis (color online)
Fig. 5. Mass loss of PLA samples under different absorption doses during enzymatic hydrolysis (color online)
Fig. 6. Results of PLA anaerobic fermentation experiment for biogas production under different absorption doses (color online)
Fig. 7. FTIR spectra of PLA samples with different absorbed dosages after 31 d of thermophilic fermentation (color online)
Table 1. Lactic acid concentration of PLA samples with different absorption doses
View tableView in ArticleTable 1. Lactic acid concentration of PLA samples with different absorption doses
吸收剂量 / kGy
Absorbed dose
0 20 40 60 乳酸浓度 / (mg·mL-1)
Lactic acid concentration
0.964 4 0.964 4 0.968 3 0.972 7
Table 2. Changes in molecular weight of PLA samples with different absorption doses
View tableView in ArticleTable 2. Changes in molecular weight of PLA samples with different absorption doses
吸收剂量 / Gy
Absorbed dose
Mn
/ (g∙mol-1)
Mw
/ (g∙mol-1)
Mp
/ (g∙mol-1)
PDI 0 33 834 125 539 120 534 3.71 20 22 483 90 209 97 055 4.01 40 26 356 75 673 75 259 2.87 60 27 707 70 554 67 215 2.55
Table 3. X-ray diffraction parameters of PLA samples with different absorption doses
View tableView in ArticleTable 3. X-ray diffraction parameters of PLA samples with different absorption doses
吸收剂量 / kGy
Absorbed dose
峰位 2θ /(°)
Peak position
半高宽 β /(°)
FWHM β
晶粒尺寸 / nm
Crystallite size
结晶度 / %
Crystallinity
0 16.26 0.834 86 57.1 20 16.00 0.885 93 36.1 40 16.04 0.729 109 63.1 60 16.18 0.846 91 31.5
Table 4. Thermal parameters of PLA samples at different doses
View tableView in ArticleTable 4. Thermal parameters of PLA samples at different doses
吸收剂量 / kGy
Absorbed dose
质量损失温度 / ℃
Temperature of mass loss
最高分解温度 / ℃
Maximum temperature for
decomposition, Tmax
T5% T25% T50% T75% 0 337 347 355 362 356 60 329 345 355 360 359
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Chao ZHOU, Zhen LI, Lingxi LI, Wenbao JIA, Yongsheng LING. Enhancement of anaerobic fermentation performance of polylactic acid by 60Co-γ ray irradiation pretreatment[J]. Journal of Radiation Research and Radiation Processing, 2024, 42(4): 040402
Paper Information
Category: RADIATION TECHNOLOGY APPLICATION
Received: Dec. 19, 2023
Accepted: Jan. 28, 2024
Published Online: Sep. 14, 2024
The Author Email: LING Yongsheng (凌永生)
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