PMC:4764609 / 30529-31958 JSONTXT

{"target":"https://pubannotation.org/docs/sourcedb/PMC/sourceid/4764609","sourcedb":"PMC","sourceid":"4764609","source_url":"https://www.ncbi.nlm.nih.gov/pmc/4764609","text":"The adsorption mechanism was investigated using FTIR analysis of the native DNES, native and the metal loaded DNES-CH composite in the range of 400–4000 cm−1 (Fig. 8a–c). The native DNES FTIR spectra showed sharp peaks at 874, 1418 cm−1 but after forming composite with chitosan, provided a number of functional groups which correspond to the amino and the carboxyl. In DNES-CH composite, ES is porous in nature and provides an efficient and strong support for the CH in forming the scaffold with more number of hydroxyl, carboxyl, amino and alcohol groups available to chelate the copper metal ions. FTIR spectra showed marked differences before and after adsorption of copper. Broadly, the spectrum could be divided into three distinct regions viz. 630–1000, 1180–3000, and 3300–3700 cm−1 wherein there are significant variations in the absorption patterns and the groups assigned for biosorption as given in Table 7.\nFig. 8 a FTIR spectrum of native DNES. b FTIR spectrum of native DNES–CH composite. c FTIR spectrum of copper loaded DNES–CH composite\nTable 7 FTIR peaks and their corresponding groups\nDNES–CH composite spectrum peaks (λ) Copper treated DNES–CH composite, spectrum peaks (λ) Assignment\n3747 3755, 3717 O–H \u0026 N–H groups\n3357 3376\n3304 3338\n2986 3001 Carboxyl groups\n1741 1717 Amines\n1550 1508 N–H bending vibration\n1398 1389 C-N, Amines\n1224 1182\n1022 963\n869 872 NH3 rocking vibration\n651 632 Cu–O stretching","divisions":[{"label":"figure","span":{"begin":920,"end":1055}},{"label":"label","span":{"begin":920,"end":926}},{"label":"caption","span":{"begin":927,"end":1055}},{"label":"p","span":{"begin":927,"end":1055}},{"label":"label","span":{"begin":1056,"end":1063}},{"label":"caption","span":{"begin":1064,"end":1105}},{"label":"p","span":{"begin":1064,"end":1105}},{"label":"tr","span":{"begin":1106,"end":1206}},{"label":"th","span":{"begin":1106,"end":1142}},{"label":"th","span":{"begin":1143,"end":1195}},{"label":"th","span":{"begin":1196,"end":1206}},{"label":"tr","span":{"begin":1207,"end":1239}},{"label":"td","span":{"begin":1207,"end":1211}},{"label":"td","span":{"begin":1212,"end":1222}},{"label":"td","span":{"begin":1223,"end":1239}},{"label":"tr","span":{"begin":1240,"end":1249}},{"label":"td","span":{"begin":1240,"end":1244}},{"label":"td","span":{"begin":1245,"end":1249}},{"label":"tr","span":{"begin":1250,"end":1259}},{"label":"td","span":{"begin":1250,"end":1254}},{"label":"td","span":{"begin":1255,"end":1259}},{"label":"tr","span":{"begin":1260,"end":1285}},{"label":"td","span":{"begin":1260,"end":1264}},{"label":"td","span":{"begin":1265,"end":1269}},{"label":"td","span":{"begin":1270,"end":1285}},{"label":"tr","span":{"begin":1286,"end":1302}},{"label":"td","span":{"begin":1286,"end":1290}},{"label":"td","span":{"begin":1291,"end":1295}},{"label":"td","span":{"begin":1296,"end":1302}},{"label":"tr","span":{"begin":1303,"end":1334}},{"label":"td","span":{"begin":1303,"end":1307}},{"label":"td","span":{"begin":1308,"end":1312}},{"label":"td","span":{"begin":1313,"end":1334}},{"label":"tr","span":{"begin":1335,"end":1356}},{"label":"td","span":{"begin":1335,"end":1339}},{"label":"td","span":{"begin":1340,"end":1344}},{"label":"td","span":{"begin":1345,"end":1356}},{"label":"tr","span":{"begin":1357,"end":1366}},{"label":"td","span":{"begin":1357,"end":1361}},{"label":"td","span":{"begin":1362,"end":1366}},{"label":"tr","span":{"begin":1367,"end":1375}},{"label":"td","span":{"begin":1367,"end":1371}},{"label":"td","span":{"begin":1372,"end":1375}},{"label":"tr","span":{"begin":1376,"end":1405}},{"label":"td","span":{"begin":1376,"end":1379}},{"label":"td","span":{"begin":1380,"end":1383}},{"label":"td","span":{"begin":1384,"end":1405}},{"label":"td","span":{"begin":1406,"end":1409}},{"label":"td","span":{"begin":1410,"end":1413}}],"tracks":[]}