Preparation, characterization and the adsorption characteristics of lignin/silica nanocomposites from cellulosic ethanol residue

Abstract

The preparation, characterization, and adsorption characteristics of lignin/silica nanocomposites are described. The nanocomposites were obtained from cellulosic ethanol residue (CER) by an in situ method. The lignin was used as a structure directing reagent, and sulfuric acid as precipitating reagent during the synthesis of lignin/silica nanocomposites. The effects of pH on the properties of the nanocomposites have been investigated in detail. The prepared nanocomposites were characterized by the FT-IR, SEM, TG-TGA, XPS and low-temperature nitrogen sorption methods. Adsorption capacities and adsorption behaviors of selected lignin/silica nanocomposite, lignin, and silica for Methylene Blue (MB) were also studied, respectively. The results indicated that the lignin/silica nanocomposite is a good candidate for a biosorbent, providing a potential route for the high value-added utilization of CER.

Development of Phyllanthus emblica (L) fruit as a carrier for EGCG: Interaction and in vitro digestion study

“…The peak observed around 1724 cm −1 in wet sample, was caused by the stretching vibration of C=O bond due to nonionic carboxyl groups (−COOCH 3 , −COOH); while the corresponding peak in CSP sample was shifted to 1,732 cm −1 with an obvious intensity decrease, and the intensity of the band at 1,634 cm −1 , the indicative of asymmetric stretching vibrations of ionic carboxylic acid groups (−COO − ) was enhanced (Iqbal, Saeed, & Zafar, ), which probably ascribed to the saponification caused by alkaline modification; however, the band at 1727 cm −1 and 1651 cm −1 showed opposite change trend in EP sample, indicating that ethanol interacted with the emblica fruit to produced nonionic carboxyl groups or caused the esterification of the carboxylic acids (Feng et al, ; Pholosi, Ofomaja, & Naidoo, ). The peaks around 1,450 cm −1 in samples, is assigned to the characteristic vibration from aromatic rings of lignin (Tian, Li, Zhou, & Guo, ). The spectra peaks ranged from 1,450 to 1,300 cm −1 were due to the stretching vibration of −CH 2 and in‐plane rocking of −CH 3 , respectively, this result was in line with the FTIR spectrum of the dietary fiber in apple pomace (Wu et al, ).…”

PVC Coated Lignin/silica Composites Derived from Biomass Rice Husks as a High Performance Anode Material for Lithium Ion Batteries

“…As shown in Figure 4a, LS has obvious absorption peaks at 2930, 1716 and 1592 cm À 1 , corresponding to characteristic peaks of CÀ C, C=O and C=C, respectively, which disappeared after carbonization. [25][26][27] The peaks at 1098, 815 and 477 cm À 1 are related to the stretching vibration of SiÀ OÀ Si bond, confirming the existence of SiO 2 in the samples. [28] It is worth noting that an obvious absorption peak at 1100-1200 cm À 1 is assigned to the asymmetric bending vibration of SiÀ OÀ C, which indicates that the silica and carbon in the material were not simply physically mixed, but closely bonded through chemical bonds to form a stable structure.…”

“…The functional groups of samples were characterized by FTIR. As shown in Figure 4a, LS has obvious absorption peaks at 2930, 1716 and 1592 cm −1 , corresponding to characteristic peaks of C−C, C=O and C=C, respectively, which disappeared after carbonization [25–27] . The peaks at 1098, 815 and 477 cm −1 are related to the stretching vibration of Si−O−Si bond, confirming the existence of SiO 2 in the samples [28] .…”

Extracting lignin-SiO2 composites from Si-rich biomass to prepare Si/C anode materials for lithium ions batteries

“…In the Si-rich biomass, most silicate exists in the secondary wall of cells and attaches lignin compactly, forming the multi-layers with channels to prevent the harm of bacteria and injurious insects, as well as absorb the nutrients [26][27][28]. The commensal lignin and silicate possess similar hydrolytic properties, which can be solved by alkaline solution and precipitated by acidic solution [29,30]. Xue et al [31] obtained lignin-SiO2 hybrid composite with spherical morphology from RHs with NaOH dissolving, followed by H2SO4 precipitating.…”