_1718831953 1718831953 Hamid Shirkhanloo sahar.zi67@gmail.com Hamid Shirkhanloo Analytical Methods in Environmental Chemistry Journal AMECJournal 2645-5382 2645-5552 06 30 2024 7 02 10.24200/amecj.v7.i01 https://journal.amecj.com/index.php/AMECJ-01/issue/view/30 Hasan Jasim Mohmmed Zaki Naser Kadhim This study synthesized zinc borate (Zn2BO3(OH), ZB) through one-step precipitation from nano Zinc oxide and boric acid. FTIR, XRD, SEM, EDX, and Zeta potential characterized the product. Due to the photocatalyst properties Congo Red Day (CRD) was removed from the aqueous solution. Effective factors on the adsorption efficiency are studied (time, amount of adsorbent, concentration, pH, and temperature). Results of the study indicated that the best amount of adsorbent was obtained at 0.1 g which was used against dye when adsorption capacities equal 6.034 mg g-1. Also, the adsorption capacities [q(mg/g)] were obtained at 35.556 mg g-1 in the CRD concentration of 50 mg L-1, and [q(mg/g)] was equal to 20.154 mg g-1 in 100 mL sample at pH 5.5. All adsorption processes using distilled water (DW) were analyzed using UV-Vis spectroscopy. The adsorption capacity was calculated by using Langmuir and Freundlich isotherm models, and results showed that the maximum adsorption capacity (qmax) in the Langmuir model was achieved at 212.7 mg g-1 for Zn2BO3(OH). The R-squared (R²) or the low coefficient of determination for Langmuir and Freundlich isotherms adsorption were obtained at 0.98 and 0.89, respectively. The first-order and second-order pseudo coefficients were achieved at R2=0.89 and R2=0.99, respectively.  06 29 2024 89 106 http://creativecommons.org/licenses/by/4.0 10.24200/amecj.v7.i02.319 https://journal.amecj.com/index.php/AMECJ-01/article/view/319 https://journal.amecj.com/index.php/AMECJ-01/article/download/319/578 https://journal.amecj.com/index.php/AMECJ-01/article/download/319/578