Mechanochemical synthesis of Ca-Al-Fe layered double hydroxide for efficient phosphate removal from aqueous solution

被引:4
作者
Zhu, Rixin [1 ]
Yan, Liangguo [1 ]
Song, Wen [1 ]
Ma, Zhenmin [1 ]
Jia, Ruibao [2 ]
Sun, Shaohua [2 ]
机构
[1] Univ Jinan, Sch Water Conservancy & Environm, Jinan 250022, Peoples R China
[2] Shandong Prov Water Supply & Drainage Monitoring, Jinan 250101, Peoples R China
关键词
Layered Double Hydroxides; Layered Double Oxide; Mechanochemical Method; pH Independence; Phosphorus Removal; ADSORPTIVE REMOVAL; FACILE PREPARATION; HEAVY-METALS; CONGO RED; MG-AL; WATER; IRON; CAPACITY; EQUILIBRIUM; PERFORMANCE;
D O I
10.1166/mex.2021.1951
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
A simple mechanochemical method was utilized to synthesize Ca-Al-Fe layered double hydroxide (CAF-LDH) and the Ca-Al-Fe-layered double oxide (CAF-LDO) was obtained by calcining CAF-LDH at 500 degrees C. From the results of XRD, FTIR, SEM and zeta potential, both CAF-LDH and CAF-LDO contained abundant functional groups, such as -OH, NO3- and CO32-. Over 90% removal efficiency for 25.0 mg/L phosphate was achieved with CAF-LDH and CAF-LDO at pH 3-10. The adsorption process quickly reached equilibrium within only 30 min. The isothermal and kinetics data better fit the Langmuir model (LM) and the pseudo- second-order (PSO) model, respectively. Based on the adsorption tests, zeta potential and FTIR, the interaction mechanisms were mainly electrostatic attraction and inner-sphere surface complexation (ISSC). In addition, CAF-LDH and CAF-LDO presented efficient regeneration, reusability, selectivity and potential application to remove phosphate in the water environment.
引用
收藏
页码:524 / 532
页数:9
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