Inorganic Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis, 157 71, Athens, Greece.
Dyeing, Finishing, Dyestuffs and Advanced Polymers Laboratory, DIDPE, University of West Attica, 250 Thivon St., 122 41, Athens, Greece.
Environ Geochem Health. 2024 Jun 7;46(7):233. doi: 10.1007/s10653-024-02013-3.
Dyes, considered as toxic and persistent pollutants, must be removed from organic wastes prior to their composting and application in sustainable agriculture. Azo dyes, capable of altering the physicochemical properties of soil, are difficult to expel by conventional wastewater treatments. C.I. Acid Black 1 (AB 1), a sulfonated azo dye, inhibits nitrification and ammonification in the soil, lessens the nitrogen use efficacy in crop production and passes substantially unaltered through an activated sludge process. The retention of C.I. Acid Black 1 by raw and expanded perlite was investigated in order to examine the potential effectiveness of this aluminosilicate material toward organic waste cleanup. Dye adsorption proved spontaneous and endothermic in nature, increasing with temperature for both perlites. Expanded perlite having a more open structure exhibited a better performance compared to the raw material. Several of the most widely recognized two-parameter theoretical models, i.e., Langmuir, Freundlich, Temkin, Brunauer-Emmett-Teller (BET), Harkins-Jura, Halsey, Henderson, and Smith, were applied to reveal physicochemical features characterizing the adsorption. The Langmuir, Freundlich, Temkin, BET, Henderson, and Smith equations best fitted experimental data indicating that the adsorption of anionic dye on perlites is controlled by their surface, i.e., non-uniformity in structure and charge. This heterogeneity of surface is considered responsible for promoting specific dye adsorption areas creating dye "islands" with local dye supersaturations.
染料被认为是有毒且持久的污染物，在进行堆肥和应用于可持续农业之前，必须从有机废物中去除。偶氮染料能够改变土壤的物理化学性质，很难通过传统的废水处理方法去除。C.I.酸性黑 1（AB 1）是一种磺化偶氮染料，它会抑制土壤中的硝化和氨化作用，降低作物生产中的氮利用效率，并在活性污泥工艺中基本不变地通过。为了研究这种铝硅酸盐材料对有机废物净化的潜在有效性，研究了未膨胀和膨胀珍珠岩对 C.I.酸性黑 1 的保留情况。染料吸附被证明是自发和吸热的，两种珍珠岩的温度升高都会增加。与原材料相比，具有更开放结构的膨胀珍珠岩表现出更好的性能。应用了几种最广泛认可的双参数理论模型，即朗缪尔、弗伦德利希、坦金、 Brunauer-Emmett-Teller（BET）、哈金斯-朱拉、Halsey、亨德森和史密斯，以揭示描述吸附的物理化学特征。朗缪尔、弗伦德利希、坦金、BET、亨德森和史密斯方程最适合实验数据，表明阴离子染料在珍珠岩上的吸附受其表面控制，即结构和电荷的非均一性。这种表面的不均匀性被认为是促进特定染料吸附区域形成具有局部染料过饱和度的染料“岛屿”的原因。
