Shweta Kumari, Jha Harit
Department of Biotechnology, Guru Ghasidas Vishwavidyalaya (A Central University), Bilaspur 49500, Chhattisgarh, India.
Biotechnol Rep (Amst). 2015 Jun 11;7:95-106. doi: 10.1016/j.btre.2015.05.003. eCollection 2015 Sep.
A novel lignosilicate (LS) composite was synthesized from pre-extracted (hot water, 80% ethanol, 0.3 N NaOH) lignin of rice husk (RH) using TEOS as matrix. The extracted lignins were subjected to surface modification by acetylation followed by in situ synthesis of lignosilicate (LS) composites by sol-gel method for application in nickel removal. LS were characterized by FT-IR, scanning electron microscopy (SEM), differential scanning calorimetry (DSC), particle size distribution (PSD) and atomic absorption spectroscopy (AAS). FT-IR studies showed acetyl group in the range of 1680-1690 cm whereas for adsorbed Si-O-Ni the band appeared at 870 cm. Findings suggest that alkali extracted LS with mean PSD of 14.89 nm are thermally more stable ( = 337 °C) than ethanol (ELS) and hot water (HLS) extracted LS, and exhibit potential for Ni removal (38.74%). SEM and PSD () analyses confirmed their rough surfaces and dispersive nature, respectively, suitable for metal biosorption.
采用正硅酸乙酯（TEOS）作为基质，从稻壳（RH）的预提取（热水、80%乙醇、0.3 N氢氧化钠）木质素中合成了一种新型木质素硅酸盐（LS）复合材料。对提取的木质素进行乙酰化表面改性，然后通过溶胶-凝胶法原位合成木质素硅酸盐（LS）复合材料，用于去除镍。通过傅里叶变换红外光谱（FT-IR）、扫描电子显微镜（SEM）、差示扫描量热法（DSC）、粒度分布（PSD）和原子吸收光谱（AAS）对LS进行了表征。FT-IR研究表明，乙酰基团在1680-1690 cm范围内，而对于吸附的Si-O-Ni，该谱带出现在870 cm处。研究结果表明，平均粒度为14.89 nm的碱提取LS比乙醇（ELS）和热水（HLS）提取的LS热稳定性更高（=337°C），并且具有去除镍的潜力（38.74%）。SEM和PSD（）分析分别证实了它们粗糙的表面和分散性，适合于金属生物吸附。
