Optimization of the Sound Absorption Coefficient (SAC) from Cellulose–Silica Aerogel Using the Box–Behnken Design

Abstract

Noise pollution, which has become a major environmental issue in urban areas, can be minimized using acoustic insulation derived from cellulose–silica aerogel. The raw materials required in the process include waste newspaper-based cellulose, geothermal silica, and NaOH/ZnO solution. Therefore, this study investigates the effect of cellulose, silica, and ZnO concentrations on optimizing the sound absorption coefficient (SAC) using the Box–Behnken design (BBD). The results showed that the optimum conditions were obtained at 39.8578 wt % cellulose, 16.5428 wt % silica, and 0.5684 wt % ZnO. The impedance test for the cellulose aerogel and cellulose–silica aerogel showed SAC values of 0.59 and 0.70, respectively, and were characterized by XRD, FTIR, BET–BJH, SEM–EDX, and TG. The results of XRD and FTIR data indicate that the product was cellulose–silica aerogel, and the SEM micrographs showed that silica particles were attached to the fiber surface. Furthermore, type IV isotherms were observed in the cellulose–silica aerogel, typical of mesoporous materials. The presence of silica strengthened the aerogel structure, improved its thermal stability, and increased the surface area but decreased its pore size.

Facile preparation of Bacterial cellulose‐SiO2 composite aerogel with good mechanical strength and thermal stability

“…Figure 5 shows the FT‐IR spectra of the aerogels prepared in the presence of BC. The peaks were identified, and their corresponding chemical bonds are marked on the graph [30–33] . The peaks at 3450 cm −1 and 1635 cm −1 are attributed to the O−H stretching vibration and bending vibration of residual free OH groups (or a small amount of adsorbed water), indicating the presence of unreacted −OH within the aerogel.…”

“…The peaks were identified, and their corresponding chemical bonds are marked on the graph. [30][31][32][33] The peaks at 3450 cm À 1 and 1635 cm À 1 are attributed to the OÀ H stretching vibration and bending vibration of residual free OH groups (or a small amount of adsorbed water), indicating the presence of unreacted À OH within the aerogel. The peaks around 2972 cm À 1 , 1411 cm À 1 and 907 cm À 1 are caused by the CÀ H vibration of SiÀ CH 3 .…”

Advances in modified silica nanoparticles utilization for various applications: Now and future

“…SNPs are useful in a variety of coating formulations due to their distinctive qualities, which include a wide surface area, customizable size, and chemical stability. These qualities help to advance the fields of corrosion protection, antimicrobial coatings, self-cleaning surfaces, and other cutting-edge coating applications [59].…”

Cellulose Fibers-Based Porous Lightweight Foams for Noise Insulation

“…However, they do have some negative aspects when compared to other commonly used polymeric materials. Here are some of the drawbacks of using cellulose fibers in NISp applications [ 36 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 ]. (i) Moisture sensitivity, (ii) poor fire resistance, (iii) pest attraction, (iv) settling and decomposition, (v) dust and allergen release and (vi) limited applications mean that CFs may not be ideal for situations where moisture or fire resistance is a critical concern.…”