ABSTRACT

The biodegradation of low-density Polyethylene (LDPE) is usually time-consuming, In the presence of Titania-nanoparticles, LDPE is photocatalytically degraded in smaller fragments afterward the bacteria can effectively degrade polyethylene. In the current study, potent polyethylene degrading bacteria were screened from the soil of the local dumpsite and identified using 16s rRNA sequencing. The protein-coated titania nanoparticle (TNPs) was synthesized using Sol-gel Method and characterized by XRD, and SAED-HRTEM. The photocatalytic biodegradation of LDPE (30 microns) in presence of 1M NaOH was studied by exposing it to UV irradiation, visible light, and high temperature (50°C) for 21 days separately and photocatalytic biodegradation was assessed by monitoring % weight loss at every 7 days’ time interval, tensile strength, and FTIR. After 21 days of photocatalytic biodegradation, LDPE film containing both TNPs and Lactobacillus plantarum along with 1M NaOH in presence of visible light was unveiled oxidation and enumerated via the occurrence of strong absorptions band of the carbonyl group (C=O) and also the breaking and weakening of existing absorptions bonds along with the new carbonyl functional group formation. The decline in tensile strength was measured at 21% after 21 days. Thus, experimental results on LDPE after exposure to visible irradiation along with Lactobacillus plantarum and 5% protein-coated TNP showed improvement in degradation rate and elongation 59 % and 51% within 21 days, respectively in comparison to another study (49 % Weight loss and 12% elongation after 45 days). An excellent application of this research is significantly reduced plastic waste via a maintained procedure.

摘要

低密度聚乙烯 (LDPE) 的生物降解通常很耗时，在二氧化钛纳米颗粒的存在下，LDPE 被光催化降解为更小的碎片，之后细菌可以有效地降解聚乙烯。在当前的研究中，从当地垃圾场的土壤中筛选出有效的聚乙烯降解细菌，并使用 16s rRNA 测序进行鉴定。使用溶胶-凝胶法合成了蛋白质包覆的二氧化钛纳米颗粒 (TNP)，并通过 XRD 和 SAED-HRTEM 对其进行了表征。通过将 LDPE（30 微米）分别暴露于紫外线照射、可见光和高温（50°C）21 天，研究了 LDPE（30 微米）在存在 1M NaOH 的情况下的光催化生物降解，并通过监测每个时间点的重量损失百分比来评估光催化生物降解7 天的时间间隔、拉伸强度和 FTIR。经过 21 天的光催化生物降解后，含有 TNPs 和植物乳杆菌以及 1M NaOH 的 LDPE 薄膜在可见光存在下被氧化，并通过出现羰基 (C=O) 的强吸收带以及断裂和随着新羰基官能团的形成，现有吸收键的减弱。21 天后测得拉伸强度下降了 21%。因此，与另一项研究（49% 重量减轻和45 天后伸长 12%）。