Biosorption of methylene blue by nonliving biomass of the brown macroalga Sargassum hemiphyllum
Biosorption of methylene blue by nonliving biomass of the brown macroalga Sargassum hemiphyllum
复制标题
棕色巨藻马尾藻非生物生物质对亚甲基蓝的生物吸附
DOI：
10.2166/wst.2017.343
复制
发表时间：
2017-09-01
影响因子：
2.7
通讯作者：
Long, Jianyou
中科院分区：
文献类型：
--
作者：
Liang, Jianfeng;Xia, Jianrong;Long, Jianyou
研究了半叶马尾藻对亚甲基蓝的去除能力。批实验进行了检查参数，如初始pH值，接触时间，生物量和初始染料浓度上的吸附容量的影响。S.采用傅里叶变换红外光谱（FT-IR）、扫描电子显微镜（SEM）和X射线光电子能谱（XPS）对吸附MB前后的半叶藓进行了表征。L-1，pH = 5时，单分子层吸附量为729.93 mg.g（-1），吸附时间为120 min。准二级动力学模型准确描述了吸附动力学数据。在293-313 K温度范围内的热力学参数（Δ G（0）、Δ H-0和Δ S-0）表明生物吸附是一个吸热的自发反应。红外光谱分析表明，藻体表面的羟基、胺基和羧基是吸附亚甲基蓝的主要官能团。XPS分析表明，藻体与亚甲基蓝的结合是通过-NH 2基团进行的。这些结果表明S.半叶藓是去除废水中MB染料的良好生物吸附剂。
The ability of Sargassum hemiphyllum to remove methylene blue (MB) from aqueous solution was evaluated. Batch experiments were conducted to examine the effects of parameters such as initial pH, contact time, biomass dose and initial dye concentration on adsorption capacity. S. hemiphyllum before and after MB adsorption was characterized by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The Langmuir isotherm model provided the best correlation with experimental data, and the monolayer biosorption capacity was 729.93 mg.g(-1) within 120 min using 0.5 g.L-1 algal biomass and pH of 5. The pseudo-second-order kinetic model accurately described the adsorption kinetics data. Thermodynamic parameters (Delta G(0),Delta H-0 and Delta S-0) at temperature ranges of 293-313 K demonstrated that biosorption is an endothermic and spontaneous reaction. FT-IR analysis showed that the hydroxyl, amine and carboxyl functional groups on the surface of the algae were the most important functional groups for biosorption of MB. XPS analysis indicated that the algal biomass combined with MB molecules through -NH2 groups. These results suggest that S. hemiphyllum is a favorable biosorbent for removing MB dye from wastewater.