Phosphate adsorption from wastewater using ZnAl-LDO-loaded modified banana straw biochar

• Published in: Environmental science and pollution research international Vol. 26; no. 18; pp. 18343 - 18353
• Main Authors: Jiang, Yan-Hong, Li, An-Yu, Deng, Hua, Ye, Cheng-Hui, Li, Yi
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.06.2019; Springer Nature B.V
• Subjects: Adsorption; Agrochemicals; Aluminum - chemistry; Aquatic Pollution; Atmospheric Protection/Air Quality Control/Air Pollution; bananas; Barium; biochar; Calcium chloride; Calcium sulfate; carbonates; Charcoal; Cultivation; differential thermal analysis; Earth and Environmental Science; Ecotoxicology; Environment; Environmental Chemistry; Environmental Health; Environmental science; Erosion; Fluorides; Fourier transform infrared spectroscopy; hot water treatment; Hydroxides - chemistry; Kinetics; Leachates; Magnesium; microparticles; Musa; nitrates; phosphates; Phosphates - chemistry; Phosphates - isolation & purification; phosphorus; Phosphorus removal; Principal components analysis; Rain water; Research Article; Rivers; scanning electron microscopy; Soil chemistry; Soil contamination; Soil erosion; Soil pollution; sorption isotherms; Straw; Strontium; Sulfates; thermal stability; thermogravimetry; transmission electron microscopy; Waste Water - chemistry; Waste Water Technology; wastewater; Wastewater treatment; Water Management; Water Pollution Control; Water Purification - methods; Watersheds; X-ray diffraction; X-ray photoelectron spectroscopy; Zeta potential; Zinc - chemistry; Taiwan; Adsorption; Wastewater treatment; Sorbents; Phosphate; Adsorption mechanism; Layered double hydroxides
• ISSN: 0944-1344; 1614-7499; 1614-7499
• DOI: 10.1007/s11356-019-05183-1

ZnAl-layered double hydroxide-loaded banana straw biochar (ZnAl-LDH-BSB) was prepared via the hydrothermal method, and the efficient phosphorus removal agent ZnAl-LDO-BSB was obtained by calcination at 500 °C. Based on the ZnAl-LDO-BSB adsorption characteristics, the adsorption mechanism was evaluated via TG/DTA, FTIR, XRD, SEM, HRTEM, and other characterization methods. The results showed that the ZnAl-LDO-BSB assembled into microspheres with typical hexagonal lamellar structures and presented good thermal stability. The adsorption of total phosphate (TP) by ZnAl-LDO-BSB conforms to the Langmuir model, and the theoretical maximum adsorption capacity is 185.19 mg g −1 . The adsorption kinetics were in accordance with the second-order kinetic model, and the anion influence on TP adsorption followed the order CO 3 2− > SO 4 2− > NO 3 − . The combination of zeta potential measurements with the FTIR, XRD, SEM, HRTEM, and XPS results suggested that ZnAl-LDO-BSB adsorbs TP mainly by electrostatic adsorption, surface coordination, and anion intercalation. Graphical abstract