Preparation of novel porous hydroxyapatite sheets with high Pb2+ adsorption properties by self-assembly non-aqueous precipitation method

Feng, Guo; Zheng, Eugene E.; Jiang, Feng; Hu, Zi; Fu, Huiqun; Li, Yuguang; Meng, Hui; Wu, Qian; Liu, Jianmin; Yang, Qing; Jiang, Weihui

doi:10.1016/j.ceramint.2023.07.013

Cited by 13 publications

(2 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At present, membrane filtration [4], precipitation [5], electrochemical [6], ion exchange [7] and adsorption methods [8] are used in the treatment of polluted water bodies. Chemical precipitation method refers to the method of adding precipitating agent to polluted waters, forming sediment through chemical interaction of precipitating agent and heavy metals, filtering and separating the sediment to remove heavy metal ions [9]. Precipitation method has the characteristics of low cost and good selectivity [10].…”

Section: Introductionmentioning

confidence: 99%

“…The absorbance at 452 nm was measured by UV-visible spectrophotometer. Then, according to the standard Cu(II) curve, the concentration of Cu(II) in the solution after adsorption was determined Ce.The effects of adsorption amount (0.02-1 mL), pH value(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12) and different adsorbents on the adsorption properties of Cu(II) were studied. The pH of Cu(II) solution was adjusted using HCl (0.1 mol/L) and NaOH (0.1 mol/L) standard solutions.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Preparation and application of acrylic polymer modified magnetic starch adsorption materials

HOU,

Yan

2023

Preprint

View full text Add to dashboard Cite

Heavy metal ion wastewater is very harmful to human body and environment, and the adsorption materials used in traditional adsorption methods such as starch cellulose are easily hydrolyzed, resulting in secondary pollution to water. In this paper, acrylic polymers such as polyacrylate /polyglycidyl methacrylate/polyhydroxyethyl methacrylate were grafted onto magnetic starch by grafting polymerization to improve the hydrolysis and adsorption properties of starch. Acrylic polymers modified magnetic starch materials St/Fe3O4-g-pAA, St/Fe3O4-g-pHEMA and St/Fe3O4-g-pGMA were prepared, and their properties as adsorbents for Cu(II) removal were studied. The adsorption experiment results show that St/Fe3O4-g-pAA has the best adsorption performance under the same adsorption conditions. The maximum unit adsorption capacity of St/Fe3O4-g-pAA was 78.1 mg/g under the optimum adsorption conditions of 20 mg/L initial concentration of copper ion solution, pH value of solution 7 and adsorption time 160 min. St/Fe3O4-g-pGMA has the best stability and the best reproducibility and can retain 95.7% of the first adsorption effect after 8 adsorption cycles. The adsorption properties of St/Fe3O4-g-pHEMA are the least dependent on pH value. The adsorption processes of the three acrylic polymers modified magnetic starch adsorption materials all follow the Langmuir isotherm model, which is more consistent with the second-order II kinetic model, indicating that the three acrylic polymers modified magnetic starch adsorption materials are mainly chemisorbed and occur on the single molecular layer. The thermodynamics of adsorption process was studied and the data show that adsorption process belongs to endothermic reaction and temperature rise was conducive to adsorption.

show abstract