Biplob Biswas - Academia.edu (original) (raw)

Papers by Biplob Biswas

Kagaku Kogaku Ronbunshu, 2009

Bioresource Technology, 2008

Orange waste, an available biomass, was immobilized with zirconium(IV) to investigate its feasibi... more Orange waste, an available biomass, was immobilized with zirconium(IV) to investigate its feasibility for phosphate removal from an aquatic environment. Kinetics, effects of pH and foreign anions, and the adsorption isotherm for phosphate have been examined. The adsorption capacity has been compared to that of two commercially available adsorbents such as zirconium ferrite and MUROMAC XMC 3614. The prepared gel was an effective adsorption gel for phosphate removal with a reasonably high sorption capacity of 57 mg-P/g, which was four times higher than that of zirconium ferrite. The highest removal of phosphate was observed at low pH, whereas higher pH suppressed phosphate removal, but even up to pH 9 more than 85% phosphate removal was observed. Adsorbed phosphate was eluted by NaOH solution. Fixed bed column-mode experiments confirmed the complete adsorption of phosphate in continuousmode operation. Throughout the operating conditions, zirconium was not leaked.

Separation Science and Technology, 2011

Adsorption of fluoride was studied batch wise from aqueous solution by using zirconium(IV)-loaded... more Adsorption of fluoride was studied batch wise from aqueous solution by using zirconium(IV)-loaded orange waste gel to achieve practical utility and evaluate the viability of the adsorption gel. Fluoride adsorption was found to be dependent on solution pH and the maximum adsorption of fluoride was observed at pH 2–4. The maximum sorption capacity of the gel for fluoride was evaluated as 1.2 mmol/g, which was compared to that of zirconium(IV)-loaded Amberlite 200CT, a strongly acidic cation exchange resin, which was only 0.5 mmol/g in applied experimental condition. The influence of high concentration of co-existing anions on adsorption of fluoride was studied to evaluate selectivity and competitiveness of fluoride adsorption. The presence of foreign anions such as Cl−, , , and had no significant effect on fluoride adsorption of the present gel. Adsorption of fluoride from actual waste plating solution was also carried out, suggesting very effective adsorption at a solid/liquid ratio greater than 4 g/dm3. Repeated use of the gel was also successfully examined over ten cycles of adsorption-elution-regeneration without any degradation of the gel. These results suggest that the modified orange waste gel is a promising candidate for fluoride adsorption from aqueous solution.

Separation Science and Technology, 2008

ABSTRACT Orange waste has been chemically modified and loaded with lanthanum(III) and/or cerium(I... more ABSTRACT Orange waste has been chemically modified and loaded with lanthanum(III) and/or cerium(III) to examine its adsorption behavior to both As(V) and As(III). Arsenate removal was found to be favored over a pH range of 6 ∼ 9.5 while arsenite removal took place at pH values ranging from 9 to 11. The maximum sorption capacity of the gel for As(III) removal was evaluated as 43 mg/g, while that for As(V) was 42 mg/g. Column-mode tests using the La(III)-loaded gel confirmed a complete removal of As(V). A reasonably high adsorption potential within the design criteria makes the present gel an alternative choice for arsenic removal.

Environmental Technology, 2012

This investigation provides new insights into the effective removal of tetrafluoroborate by means... more This investigation provides new insights into the effective removal of tetrafluoroborate by means of bio-sorption on waste generated in the orange juice industry. It was undertaken to evaluate the feasibility of zirconium(IV)-loaded saponified orange waste gel for removal from an aqueous solution. Batch adsorption experiments were carried out to study the influence of various factors such as pH, presence of competing anions, contact time, initial concentration and temperature on the adsorption of . The optimum removal was observed in the equilibrium pH region 2–3. The presence of co-existing anions showed no adverse effect on removal except . The equilibrium data at different temperatures were reasonably interpreted by the Langmuir adsorption isotherm and the maximum adsorption capacities were evaluated as 2.65, 3.28, 3.87 and 4.77 mmol g−1 at 293, 298, 303 and 313 K, respectively. Thermodynamic parameters such as Δ G°, Δ H° and Δ S° indicated that the nature of adsorption is spontaneous and endothermic. The results obtained from this study demonstrate the potential usability of orange waste after juicing as a good selective adsorbent.

Environmental Technology, 2011

Separation Science and Technology, 2012

Journal of Environmental Sciences-china, 2009

Ashes from sewage sludge incineration have a high phosphorus content, approximately 8% (W/W), whi... more Ashes from sewage sludge incineration have a high phosphorus content, approximately 8% (W/W), which indicates a potential resource of the limiting nutrient. Incineration of sewage sludge with subsequent recovery of phosphorus is a relatively new sludge treatment technique. In this article, the leaching of phosphorus by using sulfuric acid as well as hydrochloric acid by means of several batch experiments was presented. At the same time a selective recovery of phosphorus by adsorption was also discussed. The effects of acid concentration, temperature and time on extraction were studied. The phosphorus leaching increased with the increase in acid concentration and temperature. Kinetic studies showed that the complete leaching of phosphorus took place in less than 4 h. Selective adsorption of phosphorus by using orange waste gel provided a hint for recovery of this natural resource, which eventually could meet the ever-increasing requirement for phosphorus. The overall results indicated that the incinerated sewage sludge ash can be treated with acid to efficiently recover phosphorus and thus can be considered a potentially renewable source of phosphorus.

Journal of Hazardous Materials, 2008

Orange waste, produced during juicing has been loaded with zirconium(IV) so as to examine its ads... more Orange waste, produced during juicing has been loaded with zirconium(IV) so as to examine its adsorption behavior for both As(V) and As(III) from an aquatic environment. Immobilization of zirconium onto the orange waste creates a very good adsorbent for arsenic. Adsorption kinetics of As(V) at different concentrations are well described in terms of pseudo-second-order rate equation with respect to adsorption capacity and correlation coefficients. Arsenate was strongly adsorbed in the pH range from 2 to 6, while arsenite was strongly adsorbed between pH 9 and 10. Moreover, equimolar (0.27 mM) addition of other anionic species such as chloride, carbonate, and sulfate had no influence on the adsorption of arsenate and arsenite. The maximum adsorption capacity of the Zr(IV)-loaded SOW gel was evaluated as 88 mg/g and 130 mg/g for As(V) and As(III), respectively. Column adsorption tests suggested that complete removal of arsenic was achievable at up to 120 Bed Volumes (BV) for As(V) and 80 BV for As(III). Elution of both arsenate and arsenite was accomplished using 1 M NaOH without any leakage of the loaded zirconium. Thus this efficient and abundant bio-waste could be successfully employed for the remediation of an aquatic environment polluted with arsenic.

Journal of Colloid and Interface Science, 2007

Phosphate removal from an aquatic environment was investigated using La(III)-, Ce(III)-and Fe(III... more Phosphate removal from an aquatic environment was investigated using La(III)-, Ce(III)-and Fe(III)-loaded orange waste. The adsorption isotherm, the kinetics of adsorption and the effect of pH on the removal of phosphate have been examined. The % removal of phosphate using La(III)-and Ce(III)-loaded orange waste gel increases with increasing pH within the range of 5-7 but decreases when the pH is increased beyond this range. The equilibrium sorption was observed to be in accordance with Langmuir type adsorption and the maximum adsorption capacity was evaluated as 13.94 mg P/g of dry gel for all the three types of gels. Kinetic studies revealed that 15 h is enough to reach equilibrium in batch experiments. Fixed bed sorption experiments confirmed the continuous phosphate adsorption and elution capability of such simply modified gels. Due to their low cost, availability and significantly high adsorption capability, metal-loaded SOW gels can be effectively employed for the removal of phosphate from water.

Journal of Hazardous Materials, 2009

a b s t r a c t Zr(IV) and Fe(III) ions were loaded onto an orange waste precursor to prepare a m... more a b s t r a c t Zr(IV) and Fe(III) ions were loaded onto an orange waste precursor to prepare a metal-loaded orange waste gel, which was investigated for the adsorptive removal and recovery of antimony (III and V) from an aqueous environment. The loading capacity of the orange waste for Zr(IV) and Fe(III) was found to be 1.40 and 1.87 mmol/g, respectively. The maximum batch mode sorption capacity of the Zr(III)-loaded saponified orange waste (SOW) gel was found to be 0.94 mmol/g for Sb(III) and 1.19 mmol/g for Sb(V). A nearly similar result was found for the Fe(III)-loaded SOW gel with the sorption capacity for Sb(III) and Sb(V) being 1.12 and 1.19 mmol/g, respectively. The presence of a variety of anionic species such as carbonate, chloride, nitrate and sulfate had no influence on the adsorption of both Sb(III) and Sb(V). A column adsorption-elution test demonstrated the utility of this system in continuous mode. Selective sulfide precipitation of antimony is one of the major findings in the present work, which clearly suggests a means of effective recovery of antimony from solution containing antimony and other metal ions. Due to their low cost, availability and significantly high adsorption capacity, the metal-loaded gels are expected to be effectively employed for the removal and recovery of antimony from aqueous solution, thus leading to the establishment of a greener environment.

Journal of Hazardous Materials, 2011

Astringent persimmon was chemically cross-linked by formaldehyde to obtain a novel kind of adsorp... more Astringent persimmon was chemically cross-linked by formaldehyde to obtain a novel kind of adsorption gel, which was named as APF gel. The adsorption behaviors of Mo(VI) and Re(VII) along with other coexisting metals onto the APF gel were studied in the present paper. The APF gel was found to be effective for the adsorption of Mo(VI) while the gel is almost completely inert toward rhenium and calcium over the whole hydrochloric acid concentration region. The APF gel has a low affinity for iron, copper, lead, nickel, manganese and zinc ions when the concentration of HCl is higher than 1 mol/L. The gel exhibited selectivity only for Mo(VI) with a remarkably high adsorption capacity 1.05 mol/kg, and the adsorption behavior obeys the Langmuir model. According to the thermodynamic and kinetic studies, the endothermic adsorption process followed pseudo-second order kinetics. Also, its excellent adsorption characteristics for Mo(VI) were confirmed by the adsorption and elution tests using a column packed with the APF gel. The result provides a new approach for the recovery of Mo(VI) from a industrial waste effluent.

Bioresource Technology, 2011

Persimmon waste was chemically modified by crosslinking with concentrated sulfuric acid to obtain... more Persimmon waste was chemically modified by crosslinking with concentrated sulfuric acid to obtain a novel kind of adsorption gel, which was termed as crosslinked persimmon tannin (CPT), hereinafter. The adsorption behaviors of Mo(VI) with other coexisting metal ions onto the CPT gel were investigated. The gel exhibited selectivity only for Mo(VI) ions evidenced by the high value of separation factor of molybdenum and rhenium (b Mo/Re = 164.37), and the adsorption mechanism of Mo(VI) as a multispecies was studied. The molybdenum adsorption behavior conforms to the Langmuir model with a remarkably high adsorption capacity of 0.56 mol/kg. A kinetic study for the adsorption of molybdenum at various temperatures confirmed that the endothermic adsorption process followed pseudo-second order kinetics. Moreover, its excellent adsorption properties and applicability for Mo(VI) were demonstrated by the removal and separation of Mo(VI) from different Mo-Re containing industrial wastewaters.