Highly enhanced adsorption performance of tetracycline antibiotics on KOH-activated biochar derived from reed plants

Abstract

Organic pollutants in water are an increasingly prominent problem.

Investigation of biochar from Cedrella fissilis applied to the adsorption of atrazine herbicide from an aqueous medium

“…Regarding the textural characteristics, the BCC presented a specific surface area (Fig. 2a) of 27.96 m 2 g -1 , which is relatively low when compared to activated carbons [35,36], but high when compared to other existing biochars in the literature [37][38][39]. Furthermore, the N 2 adsorption isotherms showed a hysteresis loop in the region from 0.4 to 0.9, confirming the presence of mesopores [40].…”

Pristine and activated bentonite for toxic metal removal from wastewater

“…The pseudo-first-order, pseudo-second-order and intraparticle diffusion kinetic models (Equations ( 8)-( 11)) were compared in order to establish mechanism and rates of the adsorption process (Ololade et al 2018;Zhao et al 2020).…”

“…These hazards necessitate legislation against the direct discharge of heavy metals into the environment. Remedial alternatives for heavy metal removal from aqueous solution include adsorption, coagulation, flocculation, electrochemical removal, ion exchange, bioremediation, membrane filtration, chemical precipitation, etc (Burakov et al 2018;Zhao et al 2020). However, the limitations associated with most of them include the costs of handling sludge/secondary pollutants, sensitive operating conditions, low efficiency, toxic sludge generation, high energy consumption, and incomplete removal (Kanamarlapudi et al 2018;.…”

Effect of pyrolysis temperature on Si release of alkali-enhanced Si-rich biochar and plant response

“…Several studies have investigated the influence of alkali agents on biomass C transformation during pyrolysis (Azargohar and Dalai 2006;Chen et al 2020;Yang et al 2020;Zhao et al 2020). In general, decarboxylation reaction was known as the main process to remove C from feedstock during pyrolysis and it had similar preference for biomass as dehydration reaction under low temperature pyrolysis (Liu and Han 2015).…”

“…In our study, the clear decrease in C contents of alkali-enhanced biochars at 550 °C compared to 0B biochars indicated the significant role of alkali pretreatment (Tables S1 and S2). Alkali agent such as KOH was found to promote dehydration, decarboxylation, and decarbonylation reactions with biomass during pyrolysis (Yang et al 2020;Zhao et al 2020). The KOH treatment could enhance the decomposition of volatile intermediate, strengthen the reaction with stable C fragments, and facilitate the overall reaction rate with C matrix of biomass (Azargohar and Dalai 2006;Chen et al 2020).…”