| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1515411 | Journal of Physics and Chemistry of Solids | 2015 | 9 Pages |
•The PDA@SBP was firstly synthesized via a one-pot bio-inspired dip-coating approach.•The adsorption capacity of the native SBP was increased significantly by surface modification.•The high-cost of polydopamine have been partly replaced by SBP.•A novel bio-absorbent was provided to extend the utilization of waste sea buckthorn branches.
Polydopamine coated sea buckthorn branch powder (PDA@SBP) was facilely synthesized via a one-pot bio-inspired dip-coating approach. The as-synthesized PDA@SBP was characterized using Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM). The adsorption progresses of Safranine T on the surface of PDA@SBP adsorbent were systematically investigated. More specifically, the effects of solution pH, contact time, initial concentration and temperature were evaluated, respectively. The experimental results showed the adsorption capacity of PDA@SBP at 293.15 K could reach up to 54.0 mg/g; the adsorption increased by 201.7% compared to that of native SBP (17.9 mg/g). Besides, kinetics studies showed that pseudo-second-order kinetic model adequately described the adsorption behavior. The adsorption experimental data could be fitted well a Freundlich isotherm model. Thermodynamic analyses showed that the ST adsorption was a physisorption endothermic process. Regeneration of the spent PDA@SBP adsorbent was conducted with 0.1 M HCl without significant reduction in adsorption capacity. On the basis of these investigations, it is believed that the PDA@SBP adsorbent could have potential applications in sewage disposal areas because of their considerable adsorption capacities, brilliant regeneration capability, and cost-effective and eco-friendly preparation and use.
Graphical abstractDopamine was firstly self-polymerized and consequently adhered onto the surface of SBP substrate (denoted here as PDA@SBP). Then, the sufficient chemical functional groups on the PDA shell could easily capture Safranine T molecules onto the surface of PDA@SBP from aqueous solutions and the adsorption capability of PDA@SBP could be greatly improved in comparison with the naked SBP substrates.Figure optionsDownload full-size imageDownload as PowerPoint slide
