Comparative study of rice husk biochars for aqueous antibiotics removal

Abstract

BACKGROUND Antibiotics are widely used for the treatment of bacterial infections in humans and animals, but it can be released into water sources due to incomplete metabolism in humans or via discharge from drug manufacturers. RESULTS The efficiency of removal of three antibiotics was enhanced with increasing biochar dosage. The adsorption of three antibiotics by RH700 was much higher than by RH300 and RH500, which might be due to the larger surface area and adsorption pore volume of RH700 (211.76 m2 g‐1 and 6.25 nm, respectively). In addition, the adsorption capacity was greatly affected by the solution pH, background electrolyte and humic acid. The kinetics experiment data were well fitted by the pseudo‐second‐order kinetic model. The maximum adsorption capacities of tetracycline hydrochloride (TC), doxycycline hydrochloride (DC) and ciprofloxacin (CF) based on the Langmuir model by RH700 at 318 K were 80.9, 85.2 and 36.1 mg g‐1, respectively. RH700 exhibited high affinity for antibiotics, mainly ascribed to the chemical interaction between oxygen‐containing functional groups (phenolic hydroxyl group, carboxyl and alkoxy groups) of the biochar surface and TC, DC and CF. CONCLUSION The rice husk biochar produced at high temperature could be applied as a potential adsorbent for removal of antibiotics from water. © 2017 Society of Chemical Industry

Adsorption of Hexavalent Chromium Using Banana Pseudostem Biochar and Its Mechanism

“…increasing temperature and destruction of pore structures at high temperature [38]. The same correlation between surface area and pyrolysis temperature was also observed in previous biochar adsorption study [39]. The C 1s XPS peaks of banana pseudostem biochars are shown in Figure 2, and the ratios of C-O, C=O, COO and CO3 2− bonds to the C-C bonds based on peak area are presented in Table 2.…”

“…The BET surface area (SA) slightly increased as pyrolysis temperature increased from 300 to 500 • C, then decreased as reaching 600 • C. This was probably because of formation of more mesopores caused by escape of volatile substances with increasing temperature and destruction of pore structures at high temperature [38]. The same correlation between surface area and pyrolysis temperature was also observed in previous biochar adsorption study [39]. The C 1s XPS peaks of banana pseudostem biochars are shown in Figure 2, and the ratios of C-O, C=O, COO and CO 3 2− bonds to the C-C bonds based on peak area are presented in Table 2.…”

Effects of Biochar in Soil and Water Remediation: A Review

“…According to the residues types, biochar can present diverse physiochemical properties biochar's content of volatile matter, dissolved organic matter, ash, and carbon [1,15]. Additionally, the pyrolysis condition may influence the physicochemical and chemical properties of biochar [16,17]. However, there are characteristics that are always present, such as rich carbon content, high cation exchange capacity, large surface area, and stability structure [1,13].…”

“…These characteristics, namely specific surface area, porosity, and cation exchange capacity, are responsible for the high adsorption capacity that gives it the ability to remove organic pollutants and heavy metals [13]. Also, the solution pH has a great influence on the adsorption capacity of biochars [16]. Moreover, biochar will improve the soil's biological activities, nutrient retention, water-retention capacity, an increase of pH value, and amount of soil organic matter.…”

Role of non‐ion surfactants in three‐dimensional ordered porous biomass carbon foam derived from the liquefied eucalyptus sawdust for metronidazole adsorption

“…6 Various powder adsorbents are used for adsorption of pollutants from aqueous solutions. [7][8][9][10][11] However, the adsorbent in a powdered form is inappropriate for solid-liquid separation after adsorption, which will cause secondary pollution to the environment. In our previous study, we prepared Vallisneria natans particles by a chemical co-precipitation method magnetic which were capable of being readily and rapidly separated under a proper magnetic field.…”