Abstract
In this study, locally grown bamboo ( Gigantochloa spp.) was used as feedstock for pyrolysis production of biochar under various pyrolysis temperatures (400–800°C). The resultant biochars were tested for their performance in adsorptive removal of the methylene blue (MB) dye. The scope of the adsorption experiment includes the effects of adsorbent dosage, solution pH, initial adsorbate concentration, and contact time. The adsorption data confirmed that pyrolysis temperature has a significant effect on adsorptive performance, whereas biochar pyrolysed at 500°C (BC500) has the highest adsorptive performance with the maximum adsorption capacity (derived from the Langmuir model) being 86.6 mg g-1. Basic characterisations (SEM, EDX, XRD, FTIR, and BET) were carried out for BC500 where FTIR and SEM confirmed the adsorption of MB onto the biochar, while the BET data showed the reduction of the BET surface area, total pore volume, and pore diameter after the adsorption process.
Highlights
The textile industry is an ever-growing market associated with the production of fabric
It was revealed that pyrolysis temperature of 500°C resulted in the highest biochar yield at 11.39% and possessed the highest adsorptive performance when compared to biochar produced at other temperatures
The scanning electron microscope (SEM) image revealed the rough surface of biochar which becomes smoother after methylene blue (MB) adsorption, while energy-dispersive X-ray spectroscopy (EDX) data reveal the composition of C, O, S, Cl, and K elements in biochar pyrolysed at 500°C (BC500)
Summary
The textile industry is an ever-growing market associated with the production of fabric. Despite its significance, this industrial sector contributes to the largest global polluters, in releasing untreated effluents into the water bodies [1, 2]. This industrial sector contributes to the largest global polluters, in releasing untreated effluents into the water bodies [1, 2] These effluents consist of various organic compounds and toxic substances. Dyes, which are widely used to impart colour onto products, are among the many effluents that are discharged from textile factories, which account for more than 50% of the world’s dyestuff market [6]. Despite its many practical uses, MB is a known irritant that can cause eye burn and, if consumed, can cause nausea, headache, increased heart rate, and the inflammation of the gastrointestinal tracts [7,8,9]
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