Environmental Chemistry Laboratory, Resource Management and Environmental Section, Life Science Division, Institute of Advanced Study in Science and Technology, Guwahati, Assam, 781035, India.
Department of Chemistry, Abhayapuri College, Abhayapuri, Bongaigaon, Assam, India.
Environ Monit Assess. 2023 Aug 17;195(9):1044. doi: 10.1007/s10661-023-11656-1.
Ash collected from thrown-away by-products while preparing a popular traditional food additive, kolakhar of the Assamese community of North East, India, was used as an alternate cost-effective, porous bioadsorbent option from the conventional activated carbon for the purification of carcinogenic dyes laden water. The base material for kolakhar preparation was taken from the discarded banana stem waste to stimulate agricultural waste management. Methylene blue (MB) and basic fuchsin (BF) dyes were used as model cationic dyes. Characterization techniques like CHN, Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field emission-scanning electron microscope (FE-SEM), energy dispersive X-ray (EDX), and Brunauer-Emmett-Teller (BET) analysis of the prepared banana stem ash (BSA) reveal the presence of high inorganic contents and functional groups in the irregular, porous bioadsorbent with surface area 55.534 m g. Various regulating parameters studied to optimize the adsorption capacity of BSA were bioadsorbent dose (0.1-3 g/L), temperature (298-318 K), contact time (0-150 min), pH (2-9), and initial dye concentrations (10-40 mg/L). Non-linear kinetic models suggested Elovich for both MB and BF adsorption, while the non-linear isotherm model suggested Langmuir and Temkin for MB and BF adsorption, respectively, as best-fitted curves. The monolayer adsorption capacity (qm) for MB and BF was 15.22 mg/g and 24.08 mg/g at 318 K, respectively, with more than 95% removal efficiency for both dyes. The thermodynamic parameters studied indicated that the adsorption is spontaneous. The ∆H values of MB and BF adsorptions were 2.303 kJ/mol (endothermic) and - 29.238 kJ/mol (exothermic), respectively.
从印度东北部的阿萨姆社区一种受欢迎的传统食品添加剂 kolakhar 的废弃副产物中收集的灰烬被用作替代传统活性炭的具有成本效益的多孔生物吸附剂，用于净化含有致癌染料的水。 kolakhar 的制备基础材料取自废弃的香蕉茎废物，以刺激农业废物管理。亚甲蓝 (MB) 和碱性品红 (BF) 染料被用作模型阳离子染料。对制备的香蕉茎灰 (BSA) 进行 CHN、傅里叶变换红外光谱 (FTIR)、X 射线衍射 (XRD)、X 射线光电子能谱 (XPS)、场发射扫描电子显微镜 (FE-SEM)、能谱分析 (EDX) 和 Brunauer-Emmett-Teller (BET) 等特性分析表明，不规则多孔生物吸附剂中存在高无机含量和官能团，比表面积为 55.534 m2/g。研究了各种调节参数以优化 BSA 的吸附容量，包括生物吸附剂剂量（0.1-3 g/L）、温度（298-318 K）、接触时间（0-150 min）、pH（2-9）和初始染料浓度（10-40 mg/L）。MB 和 BF 吸附的非线性动力学模型均表明 Elovich 适用，而 MB 和 BF 吸附的非线性等温线模型分别表明 Langmuir 和 Temkin 适用，作为最佳拟合曲线。在 318 K 下，MB 和 BF 的单层吸附容量（qm）分别为 15.22 mg/g 和 24.08 mg/g，对两种染料的去除效率均超过 95%。研究的热力学参数表明，吸附是自发的。MB 和 BF 吸附的 ∆H 值分别为 2.303 kJ/mol（吸热）和-29.238 kJ/mol（放热）。
