Effectiveness and mechanisms of hydrogen sulfide adsorption by camphor-derived biochar

Abstract

The characteristics and mechanisms of hydrogen sulfide (H2S) adsorption on a biochar through pyrolysis at various temperatures (100 to 500 degrees C) were investigated. The biochar used in the current study was derived from the camphor tree (Cinnamomum camphora). The samples were ground and sieved to produceparticle sizes of 0.4 mm to 1.25 mm, 0.3 mm to 0.4 mm, and <0.3 mm. The H2S breakthrough capacity was measured using a laboratory-designed test. The surface properties of the biochar were characterized using pH and Fourier-transform infrared spectroscopy (FTIR) analysis. The results obtained demonstrate that all camphor-derived biochars were effective in H2S sorption. Certain threshold ranges ofthepyrolysis temperature and surfacepH were observed, which, when exceeded, have dramatic effects on the H2S adsorption capacity. The sorption capacity ranged from 1.2 mg/g to 121.4 mg/g. The biochar with 0.3 mm to 0.4 mm particle size possesses a maximum sorption capacity at 400 degrees C. The pH and FTIR analysis results showed that carboxylic and hydroxide radical groups were responsible for H2S sorption. These observations will be helpful in designing biochar as engineered sorbents for the removal of H2S.

Removal of Hydrogen Sulfide from Biogas Using a Red Rock

“…Selection of particle size of an adsorbent is significant to enhance the adsorption ability of the material [30,31]. Particles with larger diameter have lower adsorption ability of hydrogen sulfide from biogas than the particle of smaller size [32,33]. According to our study, outcomes on hydrogen sulfide adsorption using red rock samples of different particle size are obtained as shown in Figure 5.…”

Low-cost filter media for removal of hydrogen sulphide from piggery biogas

“…The green waste-derived biochar recorded the second highest breakthrough capacity (6.5 g S/kg medium). While this value was within the wide range measured by Shang et al (2012) (1.1-114 g S/kg medium) for camphor derived biochar, it was considerably lower than the capacities reported by Shang et al (2013) which ranged from 109 to 383 g S/kg medium for biochars derived from agricultural/forestry wastes products such as camphor, rice hulls and bamboo. Others have reported on engineered GAC which has been impregnated with caustic compounds (Siefers, 2010;Abatzoglou and Boivin, 2009) such as sodium hydroxide (NaOH) or potassium hydroxide (KOH), sodium bicarbonate (NaHCO 3 ) and sodium carbonate (Na 2 CO 3 ) or strong oxidising agents such as potassium permanganate (KMnO 4 ).…”

Biochar reduces the bioavailability of di-(2-ethylhexyl) phthalate in soil

“…Biochar is known as black carbon that is formed by the pyrolysis of biomass and is referred to as a 'super sorbent' for contaminants (Shang et al, 2012). Many studies have shown that soil amendment with biochar could enhance soil adsorption of contaminants and thus reduce their bioavailability and leaching risk (Cabrera et al, 2011;Lü et al, 2012;Song et al, 2013).…”