Abstract
Modified eggshell adsorbent was prepared with 5% potassium permanganate solution to adsorb phosphorus in simulated wastewater. Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and scanning electron microscopy (SEM) were used to clarify their phosphorus removal mechanisms. Isothermal and kinetic equations were fitted to explain the mechanism of phosphorus adsorption. The results showed that the optimum conditions were as follows: phosphorus concentration of 5 mg·L-1, wastewater pH of 2, adsorbent dosage of 3.5 g, adsorption time of 350 min, phosphorus adsorption rate of modified eggshell was 90.81%, and the experimental results were relatively stable. According to the characterization, the eggshell adsorbent has good crystallinity, irregular surface structure and abundant pore channels，and the main functional groups on the surface are hydroxyl (-OH) and C-H groups, which enhanced the adsorption effect.
Highlights
With the development of industrialization and the improvement of people's living standards, the problem of environmental pollution has become increasingly prominent
One of the main elements leading to water eutrophication is phosphorus
Phosphorus removal from wastewater has become a hot topic in research
Summary
With the development of industrialization and the improvement of people's living standards, the problem of environmental pollution has become increasingly prominent. The proportion of eutrophication in surface water in China has increased from 5% in the past to 55%[1]. One of the main elements leading to water eutrophication is phosphorus. If untreated phosphorous-containing wastewater is discharged into water, it will lead to a sharp decline in dissolved oxygen in water and a large number of aquatic organisms will die, which will affect the ecological balance of water[2]. Phosphorus removal from wastewater has become a hot topic in research. Due to its low cost and good effect, adsorption is a relatively common method for phosphorus removal[3]. The selection of adsorbent with low price and good effect has become a key factor in the treatment of phosphorouscontaining wastewater by adsorption. Some scholars at home and abroad have tried to use modified zeolite[4], lanthanum-modified bentonite[5], activated alumina[6] and other adsorption and dephosphorization methods
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