Adsorption of Phosphate in Aqueous Phase by Biochar Prepared from Sheep Manure and Modified by Oyster Shells

Abstract

Sheep manure and oyster shells as C and Ca sources, respectively, were used to obtain Ca-enriched biochar materials with a high dephosphorization efficiency. This approach is helpful for the utilization of livestock manure and shell solid waste as well as for creating highly adsorbent materials. The results show that as the Ca content in biochar was increased, the material's phosphate adsorption capacity increased. The maximum adsorption efficiency reached 94%. The highest adsorption capacity (calculated using Langmuir fitting) of the material containing 1:1 biochar/oyster shell weight ratio reached 146.3 mg P/g. With the increase of the pH value of phosphate solution, the adsorption capacity of the sample gradually increased to 89.5−93.3 mg P/g. The adsorption occurred mainly by complexation. The results of this work provide insights into livestock manure and shell solid waste utilization, which yields a material with useful adsorption properties that can be applied for the removal of phosphate and other inorganics from water.

Preparation and Characterization of Biochars from Plant and Animal Waste Under Different Pyrolysis Temperature

“…FTIR spectrum of PFB-300 biochar shows peaks at 3441 cm -1 which obtained to be sharper peak at 3410cm -1 as the temperature increased in PFB-700 attributable to the stretching O-H possibly from carboxyl, phenol, and alcohol functional groups [30]. We also notice the distinctive C-H stretching vibration of the alkyl structure of aliphatic groups at 2877 cm − 1 for PFB-700 but not for the PFB-300 [24,31,32]. The band at 1697-1512 cm − 1 in both PFB-300 and PFB-700 biochar sample due to the presence of aromatic C=C and C=O stretching vibration represented possible conjugated ketones 1600 cm − 1 [33,34].…”

Controlling Eutrophication of Aquaculture Production Water Using Biochar: Correlation of Molecular Composition with Adsorption Characteristics as Revealed by FT-ICR Mass Spectrometry

“…However, the inhibiting effect of adsorption among similarly charged anions has been reported due to competition for adsorption sites between NO 3 − and PO 4 3− and competition for exchange reactions [43]. The P removal capacity of the biochar is high when the surface is modified by ions of alkali metals, such as Ca and Mg [44]. The lower phosphorus sequestration levels of OB and IB could be attributed to the absence of alkali metal or Al and Fe cations in the biochar.…”

Removal Efficiency and Performance Optimization of Organic Pollutants in Wastewater Using New Biochar Composites

“…Ultra low ash biochar Metal steam 2800-3200℃ Figure 10 shows that the preparation conditions of BC mainly include the holding time at the maximum pyrolysis temperature, the maximum pyrolysis temperature, and the pretreatment of raw materials and carrier gas, among which the effect of the maximum pyrolysis temperature is the most obvious. The pyrolysis process of biomass can be divided into three stages: dehydration, thermal decomposition, and carbonization [21]. BC has a variety of uses, among which the strong adsorption makes BC become the current main material of organic pollutant removal.…”