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首页> 外文期刊>Journal of spectroscopy >Synthesis and Physicochemical Characterization of Anion Exchanger Based on Green Modified Bottle Gourd Shell
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Synthesis and Physicochemical Characterization of Anion Exchanger Based on Green Modified Bottle Gourd Shell

机译：基于绿色葫芦壳的阴离子交换剂的合成及理化性质

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The structural performance and biosorption behavior of a new cationic biosorbent (CALV) prepared from bottle gourd (Lagenaria vulgaris) shell (LVS) as a potentially valuable agrowaste have been established. The biosorbent with anion exchangeable function was synthesized from a modified lignocellulosic biomass (MLV) by a quaternary ammonium agent, N-(3-chloro-2-hydroxypropyl)trimethylammonium chloride. Preparation of the appropriate MLV precursor was firstly carried out by the process of alkaline pretreatment of LVS biomass using a green carbonate solution. In this way, partial delignification, removal of extractive substances, and increased porosity of the cellulose-enriched MLV biomass, as well as the activation of available cellulosic microfibrils to alkaline-cellulose have been achieved. The optimization of synthesis conditions was carried out by direct estimation of the CALV biosorption efficiency to phosphate (using ICP-OES) and nitrate (using UV-VIS) from the aqueous solutions. The structural changes of MLV precursors during green modification and the success of synthesis and biosorbent performances before and after the removal of anions from contaminated solutions have been registered and clarified by physicochemical methods, which include elemental analysis, chemical constitution, morphological characterization, and FTIR spectroscopy. In accordance with the FTIR spectroscopic analysis and isotherm studies, a structural model of the CALV biosorbent and its ion exchange mechanism are proposed.
机译：已经建立了一种新的阳离子生物吸附剂（CALV）的结构性能和生物吸附行为，这种阳离子生物吸附剂由葫芦壳（Lagenaria vulgaris）壳（LVS）制成，可作为潜在的有价值的增味剂。通过季铵试剂N-（3-氯-2-羟丙基）三甲基氯化铵由改性的木质纤维素生物质（MLV）合成具有阴离子交换功能的生物吸附剂。首先通过使用绿色碳酸盐溶液对LVS生物质进行碱性预处理的方法来制备适当的MLV前体。以这种方式，已经实现了部分脱木质素，去除了萃取物质以及富含纤维素的MLV生物质的增加的孔隙率，以及将可用的纤维素微纤维活化为碱性纤维素。合成条件的优化是通过直接估计水溶液中CALV对磷酸盐（使用ICP-OES）和硝酸盐（使用UV-VIS）的生物吸附效率来进行的。已通过物理化学方法记录并阐明了绿色改性过程中MLV前体的结构变化以及从污染溶液中去除阴离子前后的成功合成和生物吸附性能，包括元素分析，化学组成，形态表征和FTIR光谱。根据FTIR光谱分析和等温线研究，提出了CALV生物吸附剂的结构模型及其离子交换机理。

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