Biosorption of lead from acid solution using chitosan as a supporting material for spore forming-fungal biomass encapsulation

The adsorption of dibutyl phthalate (DBP) from aqueous solution using phoenix leaves activated carbon (PLAC) by chemical activation with phosphate was investigated. After scanning electron microscopy, energy dispersive X-ray spectrometry, Brunauer-Emmett-Teller (BET) and infrared spectrum characterization of PLAC, the influences of solution pH, contact time, initial DBP concentration and temperature on the adsorption rate were investigated. The isotherm, kinetic and thermodynamic parameters were explored to describe the experimental data. The PLAC has a heterogeneous distribution of grain and a well-developed porous structure. The main elements of PLAC are 24.26 % carbon, 70.65 % oxygen and 3.75 % phosphor. The BET surface area of the sample is 593.52 m 2 /g with the average pore diameter of 6.31 nm. The single-point total pore volume was found to be 0.52 cm 3 /g. The infrared spectrum showed the complexity of the material. The maximum DBP adsorption rate was 97.36 %, and the maximum adsorption capacity was 48.68 mg/g at pH 13. The monolayer sorption capacity of the biosorbent for DBP was found as 133.33 mg/g with the Langmuir isotherm. The equilibrium data fitted with Freundlich isotherm better than Langmuir, Dubinin-Radushkevich and Temkin isotherm. The kinetic data were best described by the pseudo-second-order model better than pseudo-first-order kinetic, intraparticle diffusion, and Elovich model. The thermodynamic studies indicated that the sorption process spontaneous, thermodynamically favorable and endothermic. The PLAC can be an alternative material for treatment of DBP wastewater.

Section: Characterization Of the Placmentioning

confidence: 99%

Efficient adsorption of dibutyl phthalate from aqueous solution by activated carbon developed from phoenix leaves

Wang

2014

“…Linear correlation of q versus t 1/2 designates the presence of intraparticle diffusion, and if C = 0, intraparticle diffusion controls the process' rate, whereas if C = 0, intraparticle diffusion is not the rate-controlling step, but film diffusion is involved in the metal sorption process (Al-Degs et al 2006;Lang et al 2013). Clearly, there is a linear dependence of q on t 1/2 at all temperatures studied, suggesting that intraparticle diffusion might be involved in the sorption of U(VI) by MSR (Fig.…”

Section: Reaction-based Kineticsmentioning

confidence: 99%

Biosorption of U(VI) from aqueous systems by malt spent rootlets. Kinetic, equilibrium and speciation studies

Anagnostopoulos

Symeopoulos

Bourikas

et al. 2015

A low-cost and environmentally friendly cleanup technique is evaluated in this study, based on the use of a brewery by-product, malt spent rootlets, as potential biosorbent for U(VI) sequestration from aquatic systems. Uranium uptake was rapid (2.5 h at 25°C), and MSR exhibited capability of removing U(VI) from effluents of high acidity (pH 1.5) and salinity (0.5 M NaCl and NaNO 3 ). Maximum uptake was 157 mg U(VI) g -1 at 25°C. The pseudo-second-order model gave the best fit for kinetic data, whereas film diffusion was the rate-controlling step. Langmuir adsorption isotherm was the best fitting model. Activation energy, thermodynamic data and the extent of sorption reversibility implied that sorption of U(VI) is predominantly chemical. FTIR studies showed that lignin moieties are mainly responsible for U(VI) uptake. Speciation modeling showed that only positively charged and uncharged uranium species can be retained on the biomass. Finally, desorption studies revealed that Na 2 CO 3 was the most efficient eluent with 78 % of U(VI), previously bound on the biosorbent's surface, recovered.

“…For the separation, removal and preconcentration of Pb(II) various types of fungal species immobilised on different solid supports were studied. Chitosan-immobilised Rhizopus arrhizus beads (Lang et al 2013) and immobilised Pycnoporus sanguineus beads (Yus Azila et al 2008) were reported for Pb(II). Solid phase extraction of Pb(II) was carried out with Aspergillus fumigatus (Soylak et al 2006), Penicillium italicum (Mendil et al 2008) and Aspergillus niger (Baytak et al 2007) immobilised on Diaion HP-2MG resin, Sepabeads SP 70 and silica, respectively.…”

Section: Introductionmentioning

confidence: 99%

Penicillium chrysogenum immobilised silica: flame atomic absorption spectrometric Pb determination in industrial effluent, sludge and food samples

Karve

Choudhary

2016

A solid phase extraction method based on the immobilisation of Penicillium chrysogenum on silica was developed for preconcentration and flame atomic absorption spectrometric determination of Pb(II). The immobilised sorbent was packed in a column to optimise the conditions for its quantitative sorption and desorption. Various parameters such as pH, type of eluent, sample and eluent flow rate and influence of others ions were systematically studied. Pb(II) was quantitatively sorbed at pH 4.0 at a flow rate of 2.0 mL min -1 and eluted with 10.0 mL of 1.0 M HCl at 0.2 mL min -1 flow rate. The devised procedure applied for Pb determination in tap water, an industrial effluent and sludge sample, black tea, spinach leaves and green beans (canned food) was reproducible, with a relative standard deviation of 0.8%. The method was validated by a BCR 701 standard lake sediment sample. The limit of detection and limit of quantification for Pb(II) were 7.16 and 23.88 lg L -1 , respectively, with an enrichment factor of 100.