Harish Sharma - Academia.edu (original) (raw)

Papers by Harish Sharma

Environmental Nanotechnology, Monitoring & Management, 2022

Copper and lead ions in polluted water sources pose grave ecological and health concerns to all l... more Copper and lead ions in polluted water sources pose grave ecological and health concerns to all living things. The processed biomass of Myrica esculenta was utilised as a biosorbent to remove copper and lead ions from wastewater. Biosorption evaluation was impacted by operating variables such as pH (1.0 to 7.0), metal ion concentration (10 to 50 mg/L), biomass concentration (1 to 5 g), contact time (15 to 75 min), and temperature (25 to 65 ◦C). The copper and lead ion sorption study was carried out using a batch sorption system. At pH 4.0, the highest biosorption efficiencies of Myrica esculenta for CuII and PbII were found to be 94.9 % and 90.2 %, respectively. Studies on biosorption indicated that pseudo-second-order models more accurately described kinetic data. Regarding the biosorption isotherm, the Langmuir model was the best applicable model for experimental data. On Myrica esculenta the maximum observed adsorption capacity Qmax for PbII ions is 43.86 mg/g, while the maximum observed adsorption capacity Qmax for CuII ions is 39.37 mg/g. The FTIR findings of Myrica esculenta biomass indicated that there were hydroxyl (–OH), amine (–NH), carbonyl (–C–– O) and carboxylic (–COOH) functional groups on biomass. These functional groups interact with the metal ions in synthetic wastewater. Under examined conditions, the biosorption of CuII and PbII ions on Myrica esculenta biomass was found spontaneous (ΔG0 < 0), endothermic (ΔH0 > 0), and feasible (ΔS0 > 0) according to the computed thermodynamic parameters ΔG0, ΔH0 and ΔS0.

Discover Water, 2022

Heavy metals cause outrageous ecological risks when released into the environment from many point... more Heavy metals cause outrageous ecological risks when released into the environment from many point and non-point sources. Biosorbents prepared from the leaves of Eupatorium adenophorum (AEA) and Acer oblongum (AAO) were used as practical solutions to remove the toxic heavy metal cadmium (Cd 2+) from wastewater. Biosorption of Cd 2+ was investigated using AEA and AAO biomass under batch conditions. The effect of operating variables like temperature, contact time, the pH impact, and initial metal concentration and biosorbent portion on Cd 2+ removal has been studied. The optimal pH and the sorbent dosage were found to be 7.0 and 2.0 g L −1 , respectively, and removal efficiency attained was 93.3% with an equilibrium removal time of 90 min. The equilibrium uptake of Cd 2+ was evaluated by Freundlich, Langmuir, and Temkin isotherm models. The Langmuir isotherm model was proved fit confirming single layer of sorption. The biosorption of Cd 2+ onto activated AEA and AAO biomass achieved were 45.45 mg g −1 and 44.64 mg g −1 respectively. The adsorption affinity of AEA toward Cd 2+ was discovered a lot more prominent than AAO biomass. The kinetic data of Cd 2+ biosorption onto activated AEA and AAO, fitted with a pseudo-second-order well with higher values of R 2 (> 0.99). Thermodynamics disclosed that the adsorption process was spontaneous (∆G 0 < 0), endothermic (∆H 0 > 0), and feasible (ΔS 0 > 0). The adsorption of Cd 2+ onto AEA was more exothermic and spontaneous than the AAO biosorbent. Additionally, FT-IR and SEM analysis uncovered that Cd 2+ were adsorbed onto selected biomassdue to-NH- ,-COOH,-OH, and-NH 2 groups. Ionic, coordination bond formation, and electrostatic interaction with Cd 2+ demonstrated that they were promising biosorbent for wastewater treatment.

Asian Journal of Chemistry, 2020

In the present study, removal efficiency (%) of Rubus ellipticus leaves (REL) as an adsorbent for... more In the present study, removal efficiency (%) of Rubus ellipticus leaves (REL) as an adsorbent for the removal of Pb(II), Cu(II) and Cd(II)
ions was investigated. Different parameters i.e., pH, contact time, temperature, adsorbent dose and initial metal ion concentration were
investigated to obtain the optimum adsorption efficiency. At pH 4, a maximum adsorption was 84.6, 80.2 and 74.5 % for Pb(II), Cu(II)
and Cd(II) ions, respectively. The maximum adsorption of all the three metal ions obtained at contact time (75 min), initial metal ion
concentration (10 mg/L), temperature (25 ºC) and adsorbent dose (5.0 g). The equilibrium adsorption of Pb(II), Cu(II) and Cd(II) ions at
different temperature was described by Langmuir, Freundlich and Temkin isotherms. The equilibrium data fitted well the Langmuir
adsorption isotherm. Thermodynamic parameters like Gibb′s free energy (ΔGº), enthalpy (ΔHº) and entropy (ΔSº) were also calculated.
The calculated parameters indicated that adsorption of Pb(II), Cu(II) and Cd(II) ions onto Rubus ellipticus leaves (REL) was spontaneous
(ΔGº < 0), endothermic (ΔGº > 0). The feasibility of the process was evident from the positive value of ΔSº.
Keywords: Biosorption, Isotherm models, Kinetics, Rubus ellipticus.

Abstract: The biosorption of Cu (II), Zn (II) and Pb (II) ions from aqueous solution onto dried b... more Abstract: The biosorption of Cu (II), Zn (II) and Pb (II) ions from aqueous solution onto dried biomass (Urtica dioica leaves) is discussed in the present study. The effect of variation of contact time, adsorbent dose, pH, concentration of metal ions and temperature on biosorption of metal ion is studied. Maximum adsorption was recorded for initial metal ion
concentration of 10 mg/l, adsorbent dose of 2 gm, at pH 5 with 60 minutes of contact time for Lead and Zinc, 45 minutes of contact time for Copper ion. The equilibrium conditions were well described by Langmuir, Freundlich and Temkin isotherm equations. The Langmuir isotherm model have provided a better fit with the experimental data compared to that of Freundlich and Temkin isotherm models. The values of thermodynamic parameters indicate that the adsorption reactions were spontaneous, feasible and exothermic.
Keywords: Biosorption, Heavy Metals, Urtica dioica Leaves (UDL), Isotherms, Thermodynamic Parameters

Environmental Nanotechnology, Monitoring & Management, 2022

Copper and lead ions in polluted water sources pose grave ecological and health concerns to all l... more Copper and lead ions in polluted water sources pose grave ecological and health concerns to all living things. The processed biomass of Myrica esculenta was utilised as a biosorbent to remove copper and lead ions from wastewater. Biosorption evaluation was impacted by operating variables such as pH (1.0 to 7.0), metal ion concentration (10 to 50 mg/L), biomass concentration (1 to 5 g), contact time (15 to 75 min), and temperature (25 to 65 ◦C). The copper and lead ion sorption study was carried out using a batch sorption system. At pH 4.0, the highest biosorption efficiencies of Myrica esculenta for CuII and PbII were found to be 94.9 % and 90.2 %, respectively. Studies on biosorption indicated that pseudo-second-order models more accurately described kinetic data. Regarding the biosorption isotherm, the Langmuir model was the best applicable model for experimental data. On Myrica esculenta the maximum observed adsorption capacity Qmax for PbII ions is 43.86 mg/g, while the maximum observed adsorption capacity Qmax for CuII ions is 39.37 mg/g. The FTIR findings of Myrica esculenta biomass indicated that there were hydroxyl (–OH), amine (–NH), carbonyl (–C–– O) and carboxylic (–COOH) functional groups on biomass. These functional groups interact with the metal ions in synthetic wastewater. Under examined conditions, the biosorption of CuII and PbII ions on Myrica esculenta biomass was found spontaneous (ΔG0 < 0), endothermic (ΔH0 > 0), and feasible (ΔS0 > 0) according to the computed thermodynamic parameters ΔG0, ΔH0 and ΔS0.

Discover Water, 2022

Heavy metals cause outrageous ecological risks when released into the environment from many point... more Heavy metals cause outrageous ecological risks when released into the environment from many point and non-point sources. Biosorbents prepared from the leaves of Eupatorium adenophorum (AEA) and Acer oblongum (AAO) were used as practical solutions to remove the toxic heavy metal cadmium (Cd 2+) from wastewater. Biosorption of Cd 2+ was investigated using AEA and AAO biomass under batch conditions. The effect of operating variables like temperature, contact time, the pH impact, and initial metal concentration and biosorbent portion on Cd 2+ removal has been studied. The optimal pH and the sorbent dosage were found to be 7.0 and 2.0 g L −1 , respectively, and removal efficiency attained was 93.3% with an equilibrium removal time of 90 min. The equilibrium uptake of Cd 2+ was evaluated by Freundlich, Langmuir, and Temkin isotherm models. The Langmuir isotherm model was proved fit confirming single layer of sorption. The biosorption of Cd 2+ onto activated AEA and AAO biomass achieved were 45.45 mg g −1 and 44.64 mg g −1 respectively. The adsorption affinity of AEA toward Cd 2+ was discovered a lot more prominent than AAO biomass. The kinetic data of Cd 2+ biosorption onto activated AEA and AAO, fitted with a pseudo-second-order well with higher values of R 2 (> 0.99). Thermodynamics disclosed that the adsorption process was spontaneous (∆G 0 < 0), endothermic (∆H 0 > 0), and feasible (ΔS 0 > 0). The adsorption of Cd 2+ onto AEA was more exothermic and spontaneous than the AAO biosorbent. Additionally, FT-IR and SEM analysis uncovered that Cd 2+ were adsorbed onto selected biomassdue to-NH- ,-COOH,-OH, and-NH 2 groups. Ionic, coordination bond formation, and electrostatic interaction with Cd 2+ demonstrated that they were promising biosorbent for wastewater treatment.

Asian Journal of Chemistry, 2020

In the present study, removal efficiency (%) of Rubus ellipticus leaves (REL) as an adsorbent for... more In the present study, removal efficiency (%) of Rubus ellipticus leaves (REL) as an adsorbent for the removal of Pb(II), Cu(II) and Cd(II)
ions was investigated. Different parameters i.e., pH, contact time, temperature, adsorbent dose and initial metal ion concentration were
investigated to obtain the optimum adsorption efficiency. At pH 4, a maximum adsorption was 84.6, 80.2 and 74.5 % for Pb(II), Cu(II)
and Cd(II) ions, respectively. The maximum adsorption of all the three metal ions obtained at contact time (75 min), initial metal ion
concentration (10 mg/L), temperature (25 ºC) and adsorbent dose (5.0 g). The equilibrium adsorption of Pb(II), Cu(II) and Cd(II) ions at
different temperature was described by Langmuir, Freundlich and Temkin isotherms. The equilibrium data fitted well the Langmuir
adsorption isotherm. Thermodynamic parameters like Gibb′s free energy (ΔGº), enthalpy (ΔHº) and entropy (ΔSº) were also calculated.
The calculated parameters indicated that adsorption of Pb(II), Cu(II) and Cd(II) ions onto Rubus ellipticus leaves (REL) was spontaneous
(ΔGº < 0), endothermic (ΔGº > 0). The feasibility of the process was evident from the positive value of ΔSº.
Keywords: Biosorption, Isotherm models, Kinetics, Rubus ellipticus.

Abstract: The biosorption of Cu (II), Zn (II) and Pb (II) ions from aqueous solution onto dried b... more Abstract: The biosorption of Cu (II), Zn (II) and Pb (II) ions from aqueous solution onto dried biomass (Urtica dioica leaves) is discussed in the present study. The effect of variation of contact time, adsorbent dose, pH, concentration of metal ions and temperature on biosorption of metal ion is studied. Maximum adsorption was recorded for initial metal ion
concentration of 10 mg/l, adsorbent dose of 2 gm, at pH 5 with 60 minutes of contact time for Lead and Zinc, 45 minutes of contact time for Copper ion. The equilibrium conditions were well described by Langmuir, Freundlich and Temkin isotherm equations. The Langmuir isotherm model have provided a better fit with the experimental data compared to that of Freundlich and Temkin isotherm models. The values of thermodynamic parameters indicate that the adsorption reactions were spontaneous, feasible and exothermic.
Keywords: Biosorption, Heavy Metals, Urtica dioica Leaves (UDL), Isotherms, Thermodynamic Parameters