Physicochemical and photodegradation characteristics of hematite-biochar nanocomposite prepared from bamboo sawdust

Abstract

This work implicates the synthesis of biochar-hematite nanocomposite from bamboo sawdust and its photodegradation characteristic for remazol brilliant blue. The nanocomposite was prepared through a one-step pyrolysis process in a tubular furnace under a flow of nitrogen and impregnation using FeSO4.7H2O and FeCl3.6H2O. The physicochemical properties were characterized by x-ray diffraction and Fourier transform infrared spectroscopy, which confirmed that hematite was successfully identified on the surface of the nanocomposite. The results also show that the nanocomposite is suitable for photodegradation application. The decolorization of remazol brilliant blue is suitable with the Langmuir isotherm model and pseudo-second-order kinetic model. At pH = 1, initial concentration = 200 mg/L, contact time = 60 minute and nanocomposite dosage 0.4 g/L, the decolorization efficiency reached 96.9%.

Photodegradation of methylene blue dye by hematite-biochar composite prepared from Dendrocalamus asper using microwave-assisted pyrolysis (MAP)

“…The -OH group is identified by the existence of a peak at a wave number of 3200-3700 cm -1 [4], while the existence of the C-H group is identified at a wave number of 1600-1530 cm -1 [4]. The band at 700-900 cm -1 indicates the existence of a C-O vibration [4]. The addition of hematite into biochar showed a change in the absorption peaks.…”

“…The co-precipitation method was used for HBC synthesis [4]. Distilled water (50 mL), FeCl3.6H2O (8.84 g), and FeSO4.7H2O (4.5 g) were mixed and agitated at 60 o C for 30 min.…”

“…FTIR spectra of biochar and HBC are presented in Figure 2. The -OH group is identified by the existence of a peak at a wave number of 3200-3700 cm -1 [4], while the existence of the C-H group is identified at a wave number of 1600-1530 cm -1 [4]. The band at 700-900 cm -1 indicates the existence of a C-O vibration [4].…”

“…In addition, dyestuffs usually have a high resistance to oxidizing compounds so the selection of an appropriate dye removal method from wastewater is a formidable challenge. Physicochemical methods such as the advanced oxidation process [3], photodegradation [4], adsorption [5], electrochemical [6], and membrane technique [7] have been proven to be effective in dye removal. Among these methods, adsorption using biomass-based biochar [8] and biomass-based activated carbon [9] have been recognized as promising options due to their excellent selectivity, inexpensive, simple operation, high removal efficiency, and environmental friendliness.…”

“…Among these methods, adsorption using biomass-based biochar [8] and biomass-based activated carbon [9] have been recognized as promising options due to their excellent selectivity, inexpensive, simple operation, high removal efficiency, and environmental friendliness. To overcome the limitations of adsorption, i.e., regeneration and reusability, and to increase the ability of the adsorbent in the dye removal, a hybrid technology such as photocatalytic adsorption has been developed [4] [10]. In this sense, several semiconductor oxides including TiO2 [11], SnO2 [12], and ZnO [13] are normally utilized.…”