Modified maifanite (MMF) was prepared by the synthesized method with sulfuric acid treatment and high-temperature calcination and evaluated as an effective adsorption material to remove the nutrient salt in waste watery. Compared with the raw maifanite (RMF), the MMF exhibited a higher adsorption capacity and higher removal efficiency. The results showed that the adsorption rates of total phosphorus (TP), total nitrogen (TN), ammonia nitrogen (NH3-N), nitrate-nitrogen (NOx-N), and chemical oxygen demand (COD) by MMF were 86.7%, 44.9%, 29.1%, 19.8%, and 11.9%, respectively, and compared to RMF, the average adsorption capacity of these nutrients by MMF increased by 20.5 mg/kg, 126.2 mg/kg, 61.9 mg/kg, 117.18 mg/kg, and 86.9 mg/kg, respectively. MMF maintained the basic structure and composition of maifanite, while having a rougher and looser surface, more irregular pores, wider gaps, and more active materials such as oxidizing Fe. This study suggests that MMF can be further applied to treat domestic sewage and eutrophic water.
Keywords: Adsorption; Modified maifanite (MMF); Nitrogen and phosphorus removal; Water eutrophication.
© 2021. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.