Preparing high purity white carbon black from rice husk

Abstract

In this paper, rice husk (RH) was used as raw material to prepare white carbon black, and the key technological parameters of preparing white carbon black from RH were studied through single‐factor test, orthogonal experiment, and response surface analysis. Meanwhile, the characteristic of white carbon black was also analyzed. Through orthogonal experiment analysis, it was confirmed that the order of factors affecting the purity of white carbon black was calcination temperature > alkali treatment time > final pH > surfactant. Based on the response surface optimization analysis, the optimum parameters for preparation of white carbon black were as follows: calcination temperature 610°C, alkali treatment time of 2.3 hr, final pH of 10, CTMAB was used as the surfactant. Under this condition, the purity of silica prepared could be reached to 99.39%, and the particle size was uniform, spherical, and well dispersed, which satisfied the requirements of GB/T 34698‐2017 standard.

Simultaneous isolation of cellulose and lignin from wheat straw and catalytic conversion to valuable chemical products

“…Moreover, the band at 896 cm −1 is attributed to the C-H bending vibration of β-1,4-glucosidic bonds, which is the characteristic band of cellulose in the fingerprint region [29]. The band at 1113 cm −1 belongs to the asymmetrical stretching vibration of Si-O-Si and/ or the stretching vibration of both C-O and C-O-C bonds [30,31] In the spectrum of cellulose isolated at 150 °C with 1.0 wt% H 2 SO 4 (curve b), the characteristic bands around 1734 and 1509 cm −1 belonged to hemicellulose and lignin become weaker, indicating that most hemicellulose and lignin have been removed from EWS. Similarly, in the spectrum of cellulose isolated at 150 °C with 1.5 wt% H 2 SO 4 (curve c), the characteristic bands of hemicellulose and lignin almost disappear.…”