Abstract
The performance of groundwater treatment waste (GWTW) as an adsorbent and catalyst in the decoloration of aluminum dye Sanodure green LWN (SG) solution was investigated. The raw GWTW was more suitable for dye removal than calcined at 800 °C temperature. The catalytic activity of GWTW in Fenton-like reactions in sunlight increases with decreasing pH from 5.5 to 2.5 and increasing temperature from 20 to 60 °C. The rate of 70% decoloration in the first 5 min and 92% after 50 min of 100 mg/L SG dye solution was reached at 50 °C and pH 3. Kinetics of the SG dye color removal fitted well with the double exponential and two-stage pseudo-first-order kinetic models. The activation energy of the first stage of the SG dye degradation reaction is 30.45 kJ/mol. GWTW could be re-used for the pre-treatment of dye-contaminated wastewater before entering the wastewater treatment plant.
Highlights
From ancient times, the people desired to look at colorful, beautiful-looking products in their environment and used them extensively in daily life
Experimental results obtained using groundwater treatment waste (GWTW)-Sanodure Green LWN (SG) dye adsorption systems have revealed the fact that dye removal is a strongly pH-dependent process
The effect of solution pH on SG dye removal efficiency is related to GWTW surface protonation degree
Summary
The people desired to look at colorful, beautiful-looking products in their environment and used them extensively in daily life. The chemical compounds that give the color can be harmful to the environment and dangerous for humans (Mittal, 2020). Metal coloring is performed both for technical and decorative purposes. Surfaces of aluminum alloys are usually protected by forming anodic films that can be colored (Chang et al, 2016). The color range of anodized aluminum depends on the aluminum alloy base and on the dye composition. Mono-azo, poly-azo, and metal complex organic dyes are widely used for aluminum coloring. Metal complex dyes contain complex aromatic ligands and heavy metals, which increase their toxicity
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