Study on sodium functionalized ultrasonic-diatomite and its performance for phosphorus removal

Li, Gufeng; Yang, Min; Ding, Xuemei; Tan, Wei; Li, Guizhen; Fang, Shuju; Wang, Hongbin

doi:10.5004/dwt.2021.27727

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“…In recent years, the adsorption method with low price, stable properties and high efficiency has attracted extensive attention from researchers (Yin et al 2018a). The nonmetallic mineral raw material are commonly used adsorbent materials (Xu et al 2018), mainly including bentonite (Seredych et al 2008), zeolite (Wu et al 2021), diatomite (Wu et al 2005;Li et al 2021) and etc.…”

Section: Introductionmentioning

confidence: 99%

Preparation of low-cost functionalized diatomite and its effective removal of ammonia nitrogen from wastewater

Fang¹,

Li²,

Hu³

et al. 2022

Environ Sci Pollut Res

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A low-cost functionalization method was used to treat diatomite, and an efficient adsorbent for ammonia nitrogen was prepared by optimizing the functionalization conditions. The functionalized diatomite (DTCA-Na) was characterized by SEM, EDS, BET, XRD, FT-IR and TG. The results demonstrate that DTCA-Na has excellent adsorption performance after being modified with H2SO4 (60.00 wt.%), NaCl (5.00 wt.%) and calcination at 400 °C for 2 h. While studying the effect of adsorption factors on the removal of ammonia nitrogen, the kinetic and thermodynamic behaviors in the adsorption process were discussed. The removal efficiency of the simulated wastewater with the initial ammonia nitrogen concentration of 10.00 mg/L by the DTCA-Na was more than 80% when the contact time was 60 min, pH was 6-10, the dosage of adsorbent was 1.00 g, the temperature was 25 °C. The adsorption process of ammonia nitrogen was conformed to the pseudo-first-order and Langmuir isothermal model. The removal efficiency of ammonia nitrogen was still above 80% after 5 times adsorption-desorption experiments. The DTCA-Na has a brighter prospect of application in the field of ammonia nitrogen wastewater treatment due to its excellent adsorption performance and low-cost advantage.

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