Abstract

This work is devoted to studying the adsorption of sodium dodecyl sulfate (SDS) and sodium N-lauryl sarcosinate (NLS) on activated carbons produced from hydrolytic lignin using laboratory and pilot setups. Commercially available activated carbons produced by “Sorbent” Ltd. and SKT-3 are used for comparison. The surface of the activated carbons is modified (hydrophilized) by cellulose sulfoacetate (CSA) adsorption from aqueous solutions. Amounts of surfactants adsorbed on the activated carbon surface are determined from their radioactivity using tritium-labeled compounds. It has been found that the maximum adsorption of anionic surfactants is higher on activated carbons obtained from lignin. Adsorption values in the saturation region are 1.7 and 1.5 mmol/g for SDS and NLS on activated carbons obtained from lignin and 0.8 mmol/g for both surfactants adsorbed on commercial carbons. It has been shown that the preliminary application of CSA does not affect the maximum adsorption of NLS at its high concentrations; however, it reduces its adsorption in the initial region of the isotherm. Adsorption of CSA and its ability to be retained on the surface of the activated carbons is also studied. Tritium-labeled CSA has been used to show that the isotherm of its adsorption on activated carbon obtained from lignin is S-shaped beginning from a concentration of 0.5 g/L and reaches a maximum value of 25 mg/g. In the presence of NLS, the polymer is desorbed from the carbon surface by more than 50%.

中文翻译：

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磺基乙酸纤维素改性木质素活性炭对阴离子表面活性剂的吸附

摘要

这项工作致力于利用实验室和中试装置研究十二烷基硫酸钠 (SDS) 和 N-月桂基肌氨酸钠 (NLS) 在由水解木质素生产的活性炭上的吸附。使用“Sorbent” Ltd.生产的市售活性炭和SKT-3进行比较。活性炭的表面通过磺基乙酸纤维素（CSA）从水溶液中的吸附进行改性（亲水化）。使用氚标记的化合物根据其放射性测定吸附在活性炭表面上的表面活性剂的量。已经发现，从木质素获得的活性炭对阴离子表面活性剂的最大吸附量较高。对于从木质素获得的活性炭上的 SDS 和 NLS，饱和区的吸附值为 1.7 和 1.5 mmol/g，对于吸附在商业炭上的两种表面活性剂，饱和区的吸附值为 0.8 mmol/g。结果表明，CSA的初步应用并不影响NLS在高浓度下的最大吸附量；然而，它减少了其在等温线初始区域的吸附。还研究了 CSA 的吸附及其保留在活性炭表面的能力。氚标记的CSA已被用来表明其在从木质素中获得的活性炭上的吸附等温线从浓​​度0.5g/L开始呈S形，并达到最大值25mg/g。在 NLS 存在下，聚合物从碳表面解吸超过 50%。