All-Biomass Double Network Gel: Highly Efficient Removal of Pb 2+ and Cd 2+ in Wastewater and Utilization of Spent Adsor
- PDF / 2,869,896 Bytes
- 12 Pages / 595.276 x 790.866 pts Page_size
- 74 Downloads / 166 Views
ORIGINAL PAPER
All-Biomass Double Network Gel: Highly Efficient Removal of Pb2+ and Cd2+ in Wastewater and Utilization of Spent Adsorbents Lan Wen1,2 · Yuanmeng Zhang1 · Chengbin Liu1 · Yanhong Tang3
© Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Besides excellent adsorption performance of adsorbents, the disposal of spent adsorbents should be considered for environmental concern. In this study, a new all-biomass double network Jute/sodium alginate (Jute/SA) gel is prepared via the simple dripping technique. 80 wt% water of Jute/SA hydrogel endows the adsorbent with high permeability for heavy metal ions diffusion onto internal adsorption sites. The Jute/SA gel adsorbent can efficiently remove heavy metals from melting wastewater, especially Pb2+ and C d2+. The adsorbent shows high adsorption capacities of 291.3 mg g−1 for Pb2+ and 149.9 −1 2+ mg g for C d at 298 K. The adsorption equilibrium reaches within 45 min for 45 mg L−1 Cd2+ and P b2+ using 1 g L−1 2+ 2+ adsorbent, showing 98% removal efficiency of Pb and Cd . Moreover, the removal efficiencies in 45 min reach up to 99.1% for P b2+ (7.539 mg L−1) and 89.9% for C d2+ (4.743 mg L−1) in actual melting effluent containing Zn (43.95 mg L−1), −1 −1 Cu (16.50 mg L ), Mn (19.24 mg L ), Ni (4.90 mg L−1) and Fe (33.75 mg L−1) using 1 g L−1 adsorbent. The concentrations of Pb and Cd decrease below 0.001 mg L−1 using 4 g L−1 adsorbent. Furthermore, the adsorption efficiencies for Pb2+ and Cd2+ remain above 95% in the tenth cycle, and the desorption efficiency is up to 99%. In addition, the spent Jute/SA gel was a good organic fertilizer for plant growth. This work develops an efficient and eco-friendly biomass adsorbent for the removal of heavy metals in actual wastewater. Keywords Biomass adsorbent · Heavy metals · Melting wastewater · Fertilizer
Introduction Heavy metal contaminants in water and disposal of spent heavy metal adsorbents have been an environmental concern. The excessive discharge of wastewater containing lead (Pb2+) and cadmium (Cd2+) into aquatic environment may
* Chengbin Liu [email protected] * Yanhong Tang [email protected] 1
Hunan Provincial Key Laboratory for Cost‑Effective Utilization of Fossil Fuel Aimed at Reducing Carbon‑dioxide Emissions, State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, People’s Republic of China
2
Department of Agriculture and Medical Science, Hunan Radio and TV University, Changsha 410004, People’s Republic of China
3
College of Materials Science and Engineering, Hunan University, Changsha 410082, People’s Republic of China
lead to a potential risk [1]. Adsorption technique is widely used to eliminate heavy metals in wastewater [2, 3]. Various adsorbent materials such as ion-exchange resins, carbon nanotubes and activated carbon have been extensively developed [4–6]. The adsorption process of heavy metal cations commonly involves boundary layer and intraparticle diffusion, as well as surface adsorptio
Data Loading...
