Sustainable mechanisms of biochar derived from brewers' spent grain and sewage sludge for ammonia–nitrogen capture

One-step preparation and application of magnetic sludge-derived biochar on acid orange 7 removal via both adsorption and persulfate based oxidation

“…3b. Peaks at about 3427 cm À1 (-OH stretching), 27 1627 cm À1 (C]O), 28 1050 cm À1 (C-OH vibration of carboxylic), 24 800 cm À1 (aromatic C-H) 24 and 540 cm À1 (-C-Br-) 39 were detected on both of fresh and used MSDBC and SDBC. Peak at 470 cm À1 was only detected on the spectra of fresh and used MSDBC, which should be assigned to Fe-O stretch of Fe 3 O 4 .…”

Adsorption of Ammonium Nitrogen from Aqueous Solution on Chemically Activated Biochar Prepared from Sorghum Distillers Grain

“…No obvious absorptions were found from the FTIR spectrum of NaOH-activated biochar in the range of 4000-400 cm −1 , indicating the relative absence of functional groups on its surface. However, the KOH-activated biochars presented obviously enhanced absorption peak amount and intensity: a broad band at about 3420 cm −1 attributed to hydroxyl group stretching vibration [12,17], two bands at 1590 cm −1 and 1384 cm −1 assigned to the stretching vibration of asymmetric and symmetric COO-of deprotonated carboxylate functional groups [49], and a 1045 cm −1 band caused by a C-O-C stretching mode [17]. Thus, the FTIR results indicated that the KOH-activated biochar had much more functional groups, e.g., hydroxyl groups and carboxyl groups, which are critical for the adsorption of NH 4 + -N by electrostatic interaction [50].…”

Characterization and ammonia adsorption of biochar prepared from distillers' grains anaerobic digestion residue with different pyrolysis temperatures

“…The pyrolysis heating rate was 5 ∘ C min −1 , and then held for 1.0 h at the predetermined temperature. 7 Subsequently, the sample was cooled to room temperature with the same N 2 flow rate. The solid residue left in the porcelain crucible was designated as biochar.…”

“…The complex and heterogeneous chemical compositions as well as the morphologies of resulting BRC samples significantly affected their surface chemistries and structures as shown in this study, which in turn explained the way BRC samples interacted with NH 4 + . 7 Differences in NH 4 + adsorption were a result of the properties of each BRC sample. Higher SSA was responsible for higher NH 4 + adsorption which was confirmed by the highest linear correlation coefficient (R 2 =0.982) found between K F and SSA (Table S3).…”