Dye Removal Using Hairy Nanocellulose: Experimental and Theoretical Investigations.,ACS Applied Materials & Interfaces

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Dye Removal Using Hairy Nanocellulose: Experimental and Theoretical Investigations.
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-01-17 , DOI: 10.1021/acsami.9b18679
Mandana Tavakolian _{1,

2,

3} , Hannah Wiebe _{1,

2,

3} , Mohammad Amin Sadeghi _{1,

3} , Theo G M van de Ven _{2,

3,

4}

Affiliation

Adsorption is a common technique for the treatment of dye-contaminated wastewater. Achieving a high dye removal capacity is a common challenge with sustainable, low-cost adsorbents. Recently, a class of easily functionalized, biorenewable cellulose nanoparticles called hairy nanocellulose has been developed. Electrosterically stabilized nanocrystalline cellulose (ENCC), which can be synthesized from wood pulp through a two-step oxidation by periodate and chlorite, is a form of hairy nanocellulose with a high negative charge density, and thus has the potential for a high adsorption capacity. In this work, the adsorption of methylene blue, a cationic dye, by ENCC was shown to occur up to charge stoichiometry (1400 mg dye/g adsorbent), at which point aggregation of ENCC-dye complexes is observed. A model is developed to show that the adsorption can be described by an ion-exchange mechanism and is influenced by the presence of other ions. Equilibrium dye removal is reduced at both high ionic strengths and low pH. To facilitate handling, composite hydrogel beads of sodium alginate and ENCC (ALG-ENCC beads) are developed, and their methylene blue removal capacity is shown to maintain a high removal capacity (1250 mg/g). ALG-ENCC beads provide a facile way to employ these nanoparticles on a larger scale, providing a potential means for the removal of dyes and other contaminants at larger wastewater volumes.

中文翻译：

使用有毛的纳米纤维素去除染料：实验和理论研究。

吸附是处理染料污染废水的常用技术。实现高染料去除能力是可持续，低成本吸附剂的普遍挑战。近来，已经开发了一种称为毛状纳米纤维素的易于官能化的，可生物再生的纤维素纳米颗粒。由木浆通过高碘酸盐和亚氯酸盐的两步氧化合成的电稳定纳米晶体纤维素（ENCC）是一种具有高负电荷密度的有毛纳米纤维素，因此具有高吸附能力的潜力。在这项工作中，直到电荷化学计量（1400 mg染料/ g吸附剂）为止，ENCC对亚甲基蓝（一种阳离子染料）的吸附均显示出来，此时观察到ENCC-染料络合物的聚集。开发了一个模型来表明吸附可以通过离子交换机制来描述，并受其他离子的存在的影响。在高离子强度和低pH值下，平衡染料的去除均会降低。为促进处理，开发了藻酸钠和ENCC的复合水凝胶珠（ALG-ENCC珠），并显示其亚甲基蓝的去除能力可保持较高的去除能力（1250 mg / g）。ALG-ENCC珠粒提供了大规模使用这些纳米颗粒的简便方法，为在较大废水量下去除染料和其他污染物提供了一种潜在的手段。开发了藻酸钠和ENCC的复合水凝胶珠粒（ALG-ENCC珠粒），并显示其亚甲基蓝去除能力可保持较高的去除能力（1250 mg / g）。ALG-ENCC珠粒提供了大规模使用这些纳米颗粒的简便方法，为在较大废水量下去除染料和其他污染物提供了一种潜在的手段。开发了藻酸钠和ENCC的复合水凝胶珠粒（ALG-ENCC珠粒），并显示其亚甲基蓝去除能力可保持较高的去除能力（1250 mg / g）。ALG-ENCC珠粒提供了大规模使用这些纳米颗粒的简便方法，为在较大废水量下去除染料和其他污染物提供了一种潜在的手段。

更新日期：2020-01-21

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