DIAO Han,AI Heng-yu,ZHANG Gui-ling,et al.Preparation of Aluminum Matrix Diatomite Sludge and Its Adsorption and Removal Efficiency of Phosphorus[J].China Water & Wastewater,2020,36(19 19):83-88.
Preparation of Aluminum Matrix Diatomite Sludge and Its Adsorption and Removal Efficiency of Phosphorus
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第36卷
Number:
19 19
Page:
83-88
Column:
Date of publication:
2020-10-01
- Keywords:
- aluminum matrix diatomite sludge; phosphorous adsorption and removal; pH value; adsorption mechanism
- Abstract:
- Aluminum matrix diatomite sludge (ADS) was prepared by adding polyaluminum chloride and sodium hydroxide into diatomite water sample, and the adsorption efficiency and adsorption mechanism of phosphorus in water by ADS was explored. Specific surface area and average pore diameter of ADS were 78.092 m2/g and 5.065 nm, respectively. The specific surface area of ADS was 13.5 times higher to that of diatomite, which provided a large number of sites for adsorption reaction and exhibited the characteristics of mesoporous materials. pH value had a great influence on adsorption efficiency. The adsorption efficiency was better when pH value was neutral. When pH was 6 and 8, removal efficiencies of phosphorus reached 83.0% and 80.9%, respectively. Adsorption mechanism of phosphorus by ADS was mainly chemical deposition reaction and electrostatic adsorption, and chemical adsorption played a leading role, which conformed to the quasi-secondary reaction kinetics model. The phosphorous adsorption and removal process of ADS was mainly monolayer adsorption, and the adsorption sites were evenly distributed, which was consistent with the Langmuir isotherm adsorption model. The maximum adsorption capacity of phosphorus by ADS was 15.54 mg/g, and the maximum theoretical equilibrium adsorption capacity was 15.97 mg/g.
Last Update:
2020-10-01