Characterization of algae residue biochar and its application in methyl orange wastewater treatment

Abstract

In this work, Spirulina residue was used as the raw material to prepare different biochars by changing the pyrolysis time. Moreover, the obtained products were characterized by scanning electron microscopy, transmission electron microscopy, Raman spectroscopy, Fourier transform infrared spectroscopy, and X-ray diffraction energy spectra. This experiment used the batch adsorption method to study the adsorption effect of pH, dosage, and pyrolysis time on methyl orange. The adsorption of methyl orange onto Spirulina residue biochar (SRBC) were fitted with the Langmuir isotherm model and pseudo-second-order kinetics. The results showed that the surface functional groups of SRBC obtained by dry pyrolysis were abundant, and could effectively adsorb methyl orange dye in an aqueous solution. The sample prepared at 500 °C for 5 h had the best adsorption effect on methyl orange. The change of pyrolysis time will affect the physicochemical properties of biochar from Spirulina residue, thereby affecting its adsorption effect on methyl orange dye. The analysis showed that the chemical adsorption of SRBC on methyl orange might be the primary way of dye removal. The results can provide a reference for preparing biochar from algae residue and biochar application in the removal of dye wastewater.

Use of <i>Eichhornia Crassipes</i> as a Bioadsorbent for the Removal of Methyl Orange and Methylene Blue Present in Residual Solutions

“…This behavior was observed using mesoporous activated carbon [Azam et al, 2020] for the adsorption of MB and MO, it was found that the adsorption capacity decreases with the increase of Cads, causing an increase in the removal of dyes (98.5% for MO and 82% for MB). Moreover, the use of biochar from natural sources such as black sapote leaves [Herrera-González et al, 2019], E. crassipes [Nurhadi et al, 2019], Spirulina algae residues [Zhu et al, 2021], chestnut hull [Zhang et al, 2018] lychee seeds, banana peel [Srivatsav et al, 2020] obtaining in these works a removal percentage of 66.7 up to 99.9% for both dyes.…”

Remarkable synergy between sawdust biochar and attapulgite/diatomite after co-ball milling to adsorb methylene blue

“… 39 Calculated from the D peak and G peak integration of these three materials, the I D / I G value of MBC was much higher than that of MABC10% and MDBC10%, which may be that more minerals were introduced by ball milling to destroy the structure of C element. 42 The I D / I G ratios of MABC10% and MDBC10% were closer to 1 with few change, which may be due to that the addition of ATP and DE reduced the grain size of the C unit and promoted the amorphous structure and lattice defects of C. 37,43 …”

“…Both are plans of graphite, (002) and (100), respectively, and the former was traditionally used to estimate the degree of carbon graphitization. [35][36][37] For MABC10%, there were three characteristic peaks (2q = 30.6°, 40.8°and 50.7°) that correspond to attapulgite (JCPDS No. 21-0958) and MDBC10% showed peaks of amorphous opal-A at 2q = 21.6°.…”

Preparation of dye adsorbents from renewable resources and photocatalytic degradation research

“…Yi-di et al and Hao et al respectively studied the effect of pyrolysis temperature and pyrolysis time on the adsorption effect of seaweed adsorbents. It was found that increasing the temperature and shortening the time could reduce the graphite layer spacing and improve the stability of the biochar and adsorb more dye molecules [11,12].…”