A Laboratory Investigation of the Adsorption Performance and Mechanism of Organics in Industrial Wastewater on mp-Zr(OH)4

• DOI: 10.1016/j.jwpe.2024.105327
• Publication Date: 2024-04-18T11:21:19Z
• Authors: Deqiang Zhao; Heng Lu; Hainan Liu; Bingyao Zhang; Qingkong Chen; Qiutong Yan; Xiaosong Gu; Bojie Yuan; Saleh Al-Farraj; Ky Nguyen; Mika Sillanpää; Niklas Hedin
• Keywords: Industrial wastewater treatment; Langmuir adsorption model; Chemical Stability

We reported on the development of mesoporous zirconium hydroxide (mp-Zr(OH)4) sorbents with high capacity for adsorptive removal organic pollutants from industrial wastewater. The sorbent was prepared by a one-step chemical precipitation method at room temperature. adsorption and efficiency oxygen demand (COD) wastewater were studied using an automatic measurement apparatus. effects different parameters (adsorbent dosage, time, regeneration times, adsorbate's molecular weight adsorbate solubility), isotherm, thermodynamics, kinetics evaluated. By analyzing scanning electron microscopy (SEM) images powder X-ray diffractograms (XRD) no obvious differences observed before after organics, which indicated structural stability sorbent. specific surface area reduced 450 m2/g to 189 adsorption, desorption organics 350 m2/g. COD analyzed in Langmuir model that described data better than empirical Freundlich model. This finding points towards occurred as monolayer mp-Zr(OH)4. free energy (ΔG) is range −20 kJ/mol < ΔG 0. Entropy changes are ΔS > Quasi-second-order dynamic Quasi-first-order model, elucidates its primary reliance porous surfaces incorporation adsorption.