Choudhary Sonal, Sharma Kashma, Bhatti Manpreet S, Sharma Vishal, Kumar Vijay
Institute of Forensic Science & Criminology, Panjab University Chandigarh-160014 India
Department of Chemistry, DAV College Sector-10 Chandigarh India 160011.
RSC Adv. 2022 Feb 9;12(8):4780-4794. doi: 10.1039/d1ra08786j. eCollection 2022 Feb 3.
The current study uses the free radical graft copolymerization of acrylic acid as a monomer, ,-methylene-bis-(acrylamide) as a crosslinker and ammonium persulfate as an initiator to synthesise GG-cl-poly(AA) hydrogels based on gellan gum utilising response surface methodology (RSM). A full factorial design was used to obtain the greatest percent swelling ( ), and key process variables were determined using the Pareto chart. To make the procedure cost-effective, a multiple regression model employing ANOVA projected a linear model with a maximum percentage swelling of 556 at the lowest concentration of all three studied factors. As a result, the sequential experimental design was successful in obtaining two-fold increases in the percentage swelling in a systematic way. An RSM-based central composite design was used to optimize the percentage swelling of the three most important synthesis parameters: initiator concentration, monomer concentration, and crosslinker concentration. The best process conditions are 7.3 mM L initiator, 44 μM L monomer, and 21.6 mM L crosslinker. The effective synthesis of GG-cl-poly(AA) was validated by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction, field emission scanning electron microscopy (FE-SEM), and H-nuclear magnetic resonance. The swelling behavior of GG-cl-poly(AA) in water and saline solutions, as well as its water retention capability, was investigated. In comparison to distilled water, the swelling potential of optimized hydrogel was shown to be significantly reduced in saline solutions. The addition of GG-cl-poly(AA) significantly improved the moisture properties of plant growth media (clay, sandy, and clay-soil combination), implying that it has great potential in moisture stress agriculture. GG-cl-poly(AA) biodegradation was studied by soil burial and vermicomposting methods. The composting approach showed 89.95% deterioration after 22 days, while the soil burial method showed 86.71% degradation after 22 days. The synthesized hydrogel may be beneficial for agricultural applications because of its considerable degradation behaviour, strong water retention capacity, low cost, and environmental friendliness.
本研究以丙烯酸为单体、N,N'-亚甲基双丙烯酰胺为交联剂、过硫酸铵为引发剂，采用自由基接枝共聚法，利用响应面法（RSM）合成了基于结冷胶的GG-cl-聚（AA）水凝胶。采用全因子设计以获得最大溶胀百分比（ ），并使用帕累托图确定关键工艺变量。为使该工艺具有成本效益，采用方差分析的多元回归模型预测了一个线性模型，在所有三个研究因素的最低浓度下，最大溶胀百分比为556。结果，序贯实验设计成功地以系统的方式使溶胀百分比提高了两倍。采用基于RSM的中心复合设计优化了引发剂浓度、单体浓度和交联剂浓度这三个最重要的合成参数的溶胀百分比。最佳工艺条件为引发剂浓度7.3 mM/L、单体浓度44 μM/L和交联剂浓度21.6 mM/L。通过傅里叶变换红外光谱（FTIR）、X射线衍射、场发射扫描电子显微镜（FE-SEM）和氢核磁共振对GG-cl-聚（AA）的有效合成进行了验证。研究了GG-cl-聚（AA）在水和盐溶液中的溶胀行为及其保水能力。与蒸馏水相比，优化后的水凝胶在盐溶液中的溶胀潜力显著降低。添加GG-cl-聚（AA）显著改善了植物生长介质（粘土、砂土和粘土-土壤组合）的水分特性，这意味着它在水分胁迫农业中具有巨大潜力。通过土壤掩埋和蚯蚓堆肥法研究了GG-cl-聚（AA）的生物降解。堆肥法在22天后显示出89.95%的降解率，而土壤掩埋法在22天后显示出86.71%的降解率。合成的水凝胶因其显著的降解行为、强大的保水能力、低成本和环境友好性，可能对农业应用有益。
