期刊
JOURNAL OF MATERIAL CYCLES AND WASTE MANAGEMENT
卷 23, 期 3, 页码 1037-1047出版社
SPRINGER
DOI: 10.1007/s10163-021-01193-9
关键词
Sewage sludge; Humic acid; Adsorption; Pb2+
资金
- Natural Science Foundation of Gansu province [20JR10RA236]
- University's Innovation Ability Improvement Project of Gansu Provincial office of Education [2019B-051]
This study utilized humic acid extracted from excess sludge to adsorb Pb2+ from a solution. The research found that the presence of co-existing cations negatively affected the adsorption, while increasing solution pH led to enhanced Pb2+ adsorption by the humic acid. The adsorption process involved both physical and chemical adsorption mechanisms.
This study used excess sludge from a sewage treatment plant as raw material to extract humic acid (HA) and explore the ability of HA to adsorb Pb2+ from a solution. The effects of the adsorbent amount, solution pH, and co-existing cations on the adsorption process were investigated. The study showed that the humic acid derived from sludge (S-HA) surface had a loose, clustered texture. The S-HA surface contained many oxygen-containing functional groups, such as carboxyl groups, alcohol hydroxyl groups, and phenolic hydroxyl groups. The presence of co-existing cations, such as Na+, NH4+ and Ca2+, in the solution was not conducive to the adsorption of Pb2+ by S-HA. As the solution pH increased, the adsorption of Pb2+ by S-HA gradually increased. The process by which S-HA adsorbed Pb2+ conformed to a pseudo-second order kinetic model. Additionally, the overall adsorption rate was controlled by liquid membrane diffusion and intra-particle diffusion. The adsorption isotherm followed the Langmuir model, and the S-HA had a maximum adsorption capacity of 27.59 mg/g at 25 degrees C. The adsorption dynamics and thermodynamics results showed that the adsorption of Pb2+ by S-HA occurred via both physical adsorption and chemical adsorption processes.
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