Researching | Enhancement of anaerobic fermentation performance of polylactic acid by 60Co-γ ray irradiation pretreatment

Journals >Journal of Radiation Research and Radiation Processing >Volume 42 >Issue 4 >Page 040402 > Article

Journal of Radiation Research and Radiation Processing
Vol. 42, Issue 4, 040402 (2024)

Enhancement of anaerobic fermentation performance of polylactic acid by ⁶⁰Co-γ ray irradiation pretreatment

Chao ZHOU¹, Zhen LI¹, Lingxi LI¹, Wenbao JIA^1,2, and Yongsheng LING^1,2,*

Author Affiliations

¹Institute of Nuclear Analysis Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China

²Jiangsu University Collaborative Innovation Center for Radiation Medicine, Suzhou 215031, China

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DOI: 10.11889/j.1000-3436.2023-0115 Cite this Article

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 Copy Citation Text

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FTIR spectra of PLA samples with different absorbed doses after irradiation (color online)

Fig. 1. FTIR spectra of PLA samples with different absorbed doses after irradiation (color online)

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TGA curves of PLA samples with different absorbed doses (color online)

Fig. 2. TGA curves of PLA samples with different absorbed doses (color online)

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Fig. 3. DTG curves of PLA samples with different absorbed doses (color online)

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Fig. 4. Lactate concentration of PLA samples under different absorption doses during enzymatic hydrolysis (color online)

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Fig. 5. Mass loss of PLA samples under different absorption doses during enzymatic hydrolysis (color online)

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Fig. 6. Results of PLA anaerobic fermentation experiment for biogas production under different absorption doses (color online)

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Fig. 7. FTIR spectra of PLA samples with different absorbed dosages after 31 d of thermophilic fermentation (color online)

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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 1. Lactic acid concentration of PLA samples with different absorption doses

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吸收剂量 / Gy Absorbed dose	M_n / (g∙mol^-1)	M_w / (g∙mol^-1)	M_p / (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 2. Changes in molecular weight of PLA samples with different absorption doses

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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 3. X-ray diffraction parameters of PLA samples with different absorption doses

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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, T_max

T_5%

T_25%

T_50%

T_75%

0

337

347

355

362

356

60

329

345

355

360

359

Table 4. Thermal parameters of PLA samples at different doses

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References (28)

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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

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