Nickel metal organic framework efficiency in Cadmium removal from wastewater entering the Caspian Sea using response surface model

In recent years, cadmium in wastewater and Industrial sludge has distributed in marine ecosystem and it has created many hazards to human and aquatics. Given this situation, present study aims to investigate the possibility of using Nickel based metal- organic framework as an efficient way to remove heavy metal cadmium from water. Additionally, the influence of important factors such as pH, time, and dose of absorbent has been examined in present study. The result demonstrates that all three elements have direct and significant influences on absorption process and the highest amount of cadmium removal is observed in pH =5.36 reaction time of 16.35min and absorbent dose of 0.03gr. In fact, pH plays a key role in the absorption of the element, and its interactions with the absorption time and dose can greatly increase the effectiveness of this method. According to the findings, increasing the contact time reduced the rate of adsorption efficiency and the adsorbent dose up to certain levels could have a significant effect on increasing the efficiency of the adsorption process. Also, Langmuir isotherm model has demonstrated highest conformity with laboratory results and the increase in absorbent is shown due to increase in contact surface between absorbent and adsorbate. Moreover, the application of Nickel-based metal organic framework is a cost-effective, practical, and suitable method to remove heavy metals ions like cadmium from marine ecosystems.