Adsorption of ammonium on biochar prepared from giant reed.
Giant reed was used as precursor for making biochar in order for the adsorption of NH4 (+)-N from aqueous solution. And the adsorption of the product to NH4 (+)-N was examined. The surface features of biochar were investigated by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy/energy dispersive spectrometer (SEM-EDS), and X-ray diffraction (XRD). XRD patterns showed several peaks and correspond to the high amount of crystalline material. The crystals contain KCl, K2O, CaO, MgO, and SiO and possess high surface area which enhances adsorption. The influence of different parameters such as initial concentration, adsorption time, pH, and ionic strength has been carried out. The adsorption could reach equilibrium through 24 h reaction and had the best adsorption amount at the solution pH values from 7 to 9. The cation has great influence on the adsorption of NH4 (+)-N, whereas the anion exerted a weaker effect. The adsorption followed pseudo-first-order and pseudo-second-order models. And the intraparticle diffusion and desorption studies further elucidated that the mechanism of adsorption on the product was ion exchange. The product equilibrium data was well described by the Langmuir and Freundlich model. The maximum adsorption capacities were 1.490 mg/g. Biochar derived from giant reed at 500 °C was suggested as a promising adsorbent for the removal of NH4 (+)-N from slightly polluted wastewater.
['Hou|Jie|J|', 'Huang|Lei|L|', 'Yang|Zhimin|Z|', 'Zhao|Yaqi|Y|', 'Deng|Chaoren|C|', 'Chen|Yucheng|Y|', 'Li|Xin|X|']
D000327:Adsorption D064751:Ammonium Compounds D002606:Charcoal D004058:Diffusion D006863:Hydrogen-Ion Concentration D007700:Kinetics D008855:Microscopy, Electron, Scanning D009994:Osmolar Concentration D006109:Poaceae D012996:Solutions D017550:Spectroscopy, Fourier Transform Infrared D062065:Waste Water D014874:Water Pollutants, Chemical D014961:X-Ray Diffraction
Ammonium Biochar Giant reed Adsorption experiments Adsorption kinetics and isotherms