Composite of biomass and lead resistent Aspergillus oryzae for highly efficient aqueous phase Pb(II) adsorption

Abstract

In this research, compound biosorbent peanut shell‐HA (PSH) and millet chaff‐HA (MCH), which were composited by peanut shell (PS) and millet chaff (MC) with lead resistent Aspergillus oryzae (HA), respectively, were used to remove Pb2+ from aqueous solution. The characterize of biosorbents were analyzed by FTIR and SEM. Batch experiments were performed to evaluate the effect of pH, biosorbent concentration, initial Pb2+ concentration and contact time on the Pb2+ removal. The results indicated that the functional groups and surface morphology of PSH and MCH were significantly different after compound procedures. The maximum adsorption capacity qm of PSH and MCH were 43.09% and 83.21% higher than PS and MC, respectively. Meanwhile, the compound biosorbent showed a significant adsorption advantage at the low pH and more efficient in adsorption compared to pristine materials. The adsorption isotherms and kinetics studies demonstrated that the adsorption process can be well fitted by the Langmuir and pseudo‐second‐order model, respectively. Fixed‐bed experiments showed that the MCH possesses stronger fixed bed adsorption capacity (qexp[MCH]=8.30 mg g−1,qexp[PSH]=7.13 mg g−1) and shorter height of mass transfer zone (H[MCH]=6.96 cm, H[PSH]=16.56 cm) than PSH. The compound biosorbents performs better than pristine materials with higher adsorption capacity. This study provides a promising strategy for manufacture of new biosorbent. © 2017 American Institute of Chemical Engineers Environ Prog, 36: 1658–1666, 2017

Lead Biosorption Characterisation of Aspergillus piperis

“…This scenario typically occurs during the start of the adsorption. The PFO Pb(II) adsorption rate for Aspergillus is expected to range from 0.0190 to 0.1676 [27]. The analytical form of the PFO can be seen in Equation (5).…”

“…When the adsorbate concentration is low enough the Langmuir kinetic model can be simplified to a PSO model. The PSO Pb(II) adsorption rate for Aspergillus is expected to range from 0.0019 to 0.0200 [27]. The analytical form of the PSO model can be seen in Equation ( 7):…”

Acetaldehyde Adsorption Characteristics of Ag/ACF Composite Prepared by Liquid Phase Plasma Method

“…Ag/ACF composites increased 2.4~4.2 (tb) times and 1.3 times compared to ACF, indicating that the adsorption performance of AA by Ag p was improved at breakthrough and exhaustion time. In addition, the height of t transfer zone was also reduced by 17 to 31% in Ag/ACF composites compared suggesting that the fixed bed column due to low mass transfer resistance can be us efficiently [30]. It was found that Ag particles precipitated on the surface of the the LPP reaction improved the AA adsorption ability, and the amount of Ag p acted as a major influence factor on the adsorption performance improvement presumed to be due to the high adsorption affinity between the Ag particles on t surface and the carbonyl group of AA [31,32].…”

Pilot-Scale Field Demonstration of Environmental Nanotechnology for Groundwater Defluoridation

“…In addition, utilization of the traditional fixed-bed reactor (single-column mode) for water defluoridation is still hindered by its relatively weak adsorption affinity. On the one hand, the relatively weak adsorption affinity resulted in a long mass transfer zone, , and thus considerable amounts of adsorbents were far from reaching adsorption equilibrium when fluoride in the effluent exceeded the MCL value ( e.g ., 1.0 mg/L) . On the other hand, fluoride concentration in the effluent might rise steadily, increasing the requirement for water quality monitoring to avoid excessive contaminants.…”