| Citation: |
ZHANG Liping，HU Xiang，WANG Weiwei，et al. Treatment of mine water containing ammonia nitrogen by sodium hexametaphosphate modified zeolite[J]. Coal Science and Technology，2024，52（12）：362−372. DOI: 10.12438/cst.2023-1567
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The ammonium nitrogen (NH4+—N) exceeding standard in mine waters is a widespread issue in certain mining regions of our country. As the demand for its removal escalates, a strategy involving the modification of natural zeolite (NZ) with sodium hexametaphosphate (SHMP) immersion was employed to enhance its removal efficiency. The results demonstrated that after 3 h of immersion in a 0.1 mol/L SHMP solution, SHMP-modified zeolite (SHMP−NZ) was prepared. Under conditions with an initial NH4+—N concentration of 5 mg/L and a dosage of 2 g/L, an oscillatory adsorption of 2 h led to a NH4+—N removal efficiency of 95.7%, representing a 39.9% enhancement compared to the unmodified natural zeolite. Scanning electron microscopy and surface area measurements revealed that upon modification, the zeolite exhibited enlarged pores, a smoother and more loosely structured surface, increased specific surface area, decreased micropore volume, and an augmentation in mesopore, macropore, and average pore diameter. Analyses using X-ray diffraction and Fourier-transform infrared spectroscopy indicated no significant alteration in the fundamental framework of the modified zeolite. The adsorption of NH4+—N by SHMP−NZ was optimal under weakly acidic or neutral conditions. The impact of coexisting cations on the adsorption followed the order K+ > Na+ > Ca2+ > Mg2+. Pseudo-first-order, pseudo-second-order, and Elovich kinetic nonlinear fitting suggested that both natural zeolite and SHMP−NZ adsorption of NH4+—N is better aligned with the pseudo-second-order kinetic model. The adsorption process was identified as chemisorption (ion exchange), and particle inner diffusion models revealed that the NH4+—N adsorption by both materials involves three stages: external diffusion, internal diffusion, and reaction equilibrium. The Freundlich isotherm model revealed that SHMP−NZ is more conducive to NH4+—N adsorption compared to NZ. The Langmuir isotherm model aptly described the NH4+—N adsorption process by both natural zeolite and SHMP−NZ, with correlation coefficients R2 being
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李璞. 煤矿含氨氮矿井水处理中用药量管理分析. 能源与节能. 2025(05): 342-344 .
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