Department of Chemistry, University of Engineering and Technology, Lahore, Pakistan; Institute of Polymer and Textile Engineering, University of the Punjab, Lahore 54590, Pakistan.
Institute of Polymer and Textile Engineering, University of the Punjab, Lahore 54590, Pakistan.
Int J Biol Macromol. 2021 Jul 1;182:950-958. doi: 10.1016/j.ijbiomac.2021.04.098. Epub 2021 Apr 18.
In this study, biodegradable polymeric films (BPFs) based on chitosan and acrylic acid cross-linked with 3-aminopropyl triethoxysilane (APTES) were developed for water retention and soil-conditioning applications in areas sufferings from water scarcity. A series of BPFs were prepared by varying the amount of silica nanoparticles (SiNPs) (0.67% to 2.6%) and a correlation of the optimum amount of SiNPs with thermal stability, morphology, swellability (at various pH), degradability, and anti-microbial activity were deduced. The obtained results showed that the NP 8 (containing 2.51% of SiNPs) exhibited the maximum absorption capacity (1815%) in distilled water, whereas NP6 (including 1.88% of SiNPs) expressed the maximum thermal stability (T at 375.61 °C). The microscopic images further strengthen this observation because the maximum number of micro-porous cavities was shown on the surface of NP8. The time-dependent swelling response in distilled water accomplished that hydrophilicity (percentage swelling) of films was enhanced with an increase in the concentration of SiNPs. All BPFs samples exhibited inhibitory response against both gram-positive (for Staphylococcus aureus was 2.9 cm for NP6) and gram-negative (for Escherichia coli was 0.9 cm for NP8) bacteria. The biodegradation test inferred that the degradation of BPFs in soil did not affect the soil fertility as nano-silica is proven as growth-promoting miniatures. It can be concluded that these BPFs may be efficiently employed in the agriculture sector for water retention and as a soil conditioner.
在这项研究中，开发了基于壳聚糖和丙烯酸的可生物降解聚合物薄膜（BPF），并用 3-氨丙基三乙氧基硅烷（APTES）交联，用于水资源匮乏地区的保水和土壤改良应用。通过改变二氧化硅纳米粒子（SiNPs）的量（0.67%至 2.6%）制备了一系列 BPF，并推导出最佳 SiNPs 量与热稳定性、形态、溶胀性（在各种 pH 值下）、降解性和抗微生物活性之间的相关性。结果表明，NP8（含 2.51%的 SiNPs）在蒸馏水中表现出最大的吸收能力（1815%），而 NP6（含 1.88%的 SiNPs）表现出最大的热稳定性（T 在 375.61°C）。微观图像进一步证实了这一观察结果，因为 NP8 表面显示出最大数量的微孔腔。在蒸馏水中的时变溶胀响应表明，随着 SiNPs 浓度的增加，薄膜的亲水性（溶胀百分比）增强。所有 BPF 样品均对革兰氏阳性（NP6 对金黄色葡萄球菌的抑菌圈为 2.9 厘米）和革兰氏阴性（NP8 对大肠杆菌的抑菌圈为 0.9 厘米）细菌表现出抑制作用。生物降解试验推断，BPF 在土壤中的降解不会影响土壤肥力，因为纳米硅已被证明是促进生长的微型体。可以得出结论，这些 BPF 可有效地用于农业部门的保水和土壤改良。
