Department of Chemistry, Manonmaniam Sundaranar University, Abishekapatti, Tirunelveli, 627 012, Tamilnadu, India.
Department of Chemistry, Manonmaniam Sundaranar University, Abishekapatti, Tirunelveli, 627 012, Tamilnadu, India.
Environ Res. 2023 Mar 1;220:115111. doi: 10.1016/j.envres.2022.115111. Epub 2022 Dec 28.
Adsorption is an important process for the industrial dye effluent treatment. Many adsorbents are employed such as activated carbon, metal oxide, molecular sieves etc. All those adsorbents are having their own setbacks like longer adsorption time and lower adsorption capacity. So development of fast adsorption and higher adsorption capacity is very much essential. In this view, we synthesized hybrid crystal system of tenorite and aluminosilicate framework (CuO@AS) for the faster adsorption. It is characterized by FT-IR, HRTEM and WAXRD. WAXRD proved the hybridization of two crystal systems viz tenorite & alumina in monoclinic phase and silica in trigonal phase. The crystal structure drawn based on the WAXRD data. It is observed that the tenorite and aluminosilicate framework are separate, but they are interlinked through Cu-O-Al and Cu-O-Si bond. This interconnection makes the aluminium in six coordination and Cu in four coordination. Aluminium and copper has 3 and 2 Brønsted acid sites respectively. Moreover, copper has three more OH group, so totally 5 H and 3 OH sites in copper and aluminium are responsible for the faster adsorption with high adsorption capacity compared to reported literature. To test the adsorption tendency, Victoria Blue (VB) and Metanil Yellow (MY) dyes are employed at room temperature. The rate constant of Pseudo-second order kinetics for the VB and MY are 0.002462 g mg min and 0.001619 g mg min which indicated faster adsorption of VB than MY. Moreover, total adsorption capacity for VB (636 mg/g) is higher than MY (52 mg/g). This is due to the hybridization of tenorite and aluminosilicate. Thermodynamic data such as ΔG°, ΔH° and ΔS° revealed that the adsorption is spontaneous, chemisorption and highly disordered in the adsorbent-adsorbate interface. This disorderness is due to the disordered pores present in the material.
吸附是工业染料废水处理的重要过程。许多吸附剂被用于吸附，如活性炭、金属氧化物、分子筛等。所有这些吸附剂都有其自身的缺点，如吸附时间较长和吸附容量较低。因此，开发快速吸附和高吸附容量的吸附剂是非常必要的。有鉴于此，我们合成了锌白矿和铝硅酸盐骨架的混合晶体系统（CuO@AS），以实现更快的吸附。它的特点是 FT-IR、HRTEM 和 WAXRD。WAXRD 证明了两种晶体系统（锌白矿和氧化铝为单斜相，二氧化硅为三角相）的杂交。根据 WAXRD 数据绘制的晶体结构。可以看出，锌白矿和铝硅酸盐骨架是分开的，但它们通过 Cu-O-Al 和 Cu-O-Si 键相互连接。这种连接使得铝处于六配位，铜处于四配位。铝和铜分别有 3 个和 2 个 Brønsted 酸位。此外，铜还有三个 OH 基团，因此铜和铝总共有 5 个 H 和 3 个 OH 位，与文献报道相比，这使得它们具有更快的吸附速度和更高的吸附容量。为了测试吸附倾向，我们在室温下使用维多利亚蓝（VB）和间甲酚黄（MY）染料。VB 和 MY 的准二级动力学速率常数分别为 0.002462 g mg min 和 0.001619 g mg min，表明 VB 的吸附速度比 MY 快。此外，VB 的总吸附容量（636 mg/g）高于 MY（52 mg/g）。这是由于锌白矿和铝硅酸盐的杂交。热力学数据如 ΔG°、ΔH°和 ΔS°表明，吸附是自发的、化学吸附的，并且在吸附剂-吸附质界面上高度无序。这种无序是由于材料中存在无序的孔。
