Efficacy of spent tea waste as chemically impregnated adsorbent involving ortho-phosphoric and sulphuric acid for abatement of aqueous phenol—isotherm, kinetics and artificial neural network modelling

Pathak, Uttarini; Jhunjhunwala, Aastha; Roy, Ananya; Das, Papita; Kumar, T. Santhosh; Mandal, Tamal

doi:10.1007/s11356-019-06014-z

Cited by 21 publications

(19 citation statements)

References 56 publications

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“…Figure 7a suggested that the first order Lagergren equation was predominant during the initial phase of adsorption indicating physisorption to some extent with R 2 = 0.9091 33,34 …”

Section: Resultsmentioning

confidence: 99%

Removal of levosulpiride from pharmaceutical wastewater using an advanced integrated treatment strategy comprising physical, chemical, and biological treatment

Jhunjhunwala

Pathak

Sarkar

et al. 2020

Env Prog and Sustain Energy

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In recent times the impact of pharmaceutical wastes generated from the pharmaceutical industry and domestic sewages on the aquatic ecosystem has become a major concern. The traditional sole treatment processes are not adequate for the elimination of these wastes. To overcome the lack of the individual treatment processes, integrated treatment methodology has been devised in the present study. The degradation of the pharmaceutical, levosulpiride, by using Ozone (O3), activated carbon (AC) and biological treatment by A.faecalis JF339228 and E. aurantiacum KX008295.1in its aqueous solution has been investigated. The percentage removal of Levosulpiride from its synthetic aqueous solution of 600 mg/L concentration using 2 g/L activated carbon and 5.2 g/h ozone and biological treatment by A.faecalis JF339228 and E. aurantiacum KX008295.1 in 72 hr were 51.60, 53.50, 39.97, and 37.51% respectively. Simultaneous treatment using adsorption and ozone followed by biological treatment with A. faecalis JF339228 and E. aurantiacum KX008295.1 has been employed in this study. To overcome the demerits of the individual treatment process, the integrated treatment is employed which has shown a synergistic effect in the degradation of levosulpiride with minimal doses of activated carbon, ozone, and minimum time of operation. The percentage removal of levosulpiride achieved was about 76 and 61% for 800 mg/L levosulpiride wastewater, respectively. Therefore, the integrated treatment system is rendered economical, efficient, and safe.

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“…Figure 7a suggested that the first order Lagergren equation was predominant during the initial phase of adsorption indicating physisorption to some extent with R 2 = 0.9091 33,34 …”

Section: Resultsmentioning

confidence: 99%

Removal of levosulpiride from pharmaceutical wastewater using an advanced integrated treatment strategy comprising physical, chemical, and biological treatment

Jhunjhunwala

Pathak

Sarkar

et al. 2020

Env Prog and Sustain Energy

Self Cite

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“…The design and optimization of an adsorption process for the removal of inorganic and organic contaminants from aqueous solutions critically depends on the analysis of the equilibrium isotherms (Figures 13-15). The Langmuir parameters can also be used to predict the affinity between the nitrate and each sorbent using a dimensionless separation factor (R L ) [3,10,31]:…”

Section: Langmuir Linearized Formmentioning

confidence: 99%

“…The R L value was between 0 and 1, which signifies a strong relation for adsorption (Figure 16). The Langmuir parameters can also be used to predict the affinity between the and each sorbent using a dimensionless separation factor (RL) [3,10,31]:…”

Section: Langmuir Linearized Formmentioning

confidence: 99%

Black Tea Waste as Green Adsorbent for Nitrate Removal from Aqueous Solutions

Bondarev,

Popovici,

Călin

et al. 2023

Materials

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The aim of the study was to prepare effective low-cost green adsorbents based on spent black tea leaves for the removal of nitrate ions from aqueous solutions. These adsorbents were obtained either by thermally treating spent tea to produce biochar (UBT-TT), or by employing the untreated tea waste (UBT) to obtain convenient bio-sorbents. The adsorbents were characterized before and after adsorption by Scanning Electron Microscopy (SEM), Energy Dispersed X-ray analysis (EDX), Infrared Spectroscopy (FTIR), and Thermal Gravimetric Analysis (TGA). The experimental conditions, such as pH, temperature, and nitrate ions concentration were studied to evaluate the interaction of nitrates with adsorbents and the potential of the adsorbents for the nitrate removal from synthetic solutions. The Langmuir, Freundlich and Temkin isotherms were applied to derive the adsorption parameters based on the obtained data. The maximum adsorption intakes for UBT and UBT-TT were 59.44 mg/g and 61.425 mg/g, respectively. The data obtained from this study were best fitted to the Freundlich adsorption isotherm applied to equilibrium (the values R2 = 0.9431 for UBT and R2 = 0.9414 for UBT-TT), this assuming the multi-layer adsorption onto a surface with a finite number of sites. The Freundlich isotherm model could explain the adsorption mechanism. These results indicated that UBT and UBT-TT could serve as novel biowaste and low-cost materials for the removal of nitrate ions from aqueous solutions.

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“…The hydrothermal method always needs to use a closed reactor and autoclave [ 15 , 16 ]. Although the use of acid (particularly H 3 PO 4 ) can increase the performance of biochar and some experiments about H 3 PO 4 modified biochars have been carried out in inert atmosphere at higher temperatures [ 17 , 18 , 19 , 20 , 21 ], very few literatures has reported about biochar preparation under the condition of less than 200 °C, especially under air atmosphere, because biochar prepared under inert atmosphere means a complex and costly preparation process. Furthermore, H 3 PO 4 is environmentally friendly due to its non-toxicity and easily being washed by water [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis of Cauliflower Leaves Biochar at Low Temperature in the Air Atmosphere for Cu(II) and Pb(II) Removal from Water

Tian

Moeen

et al. 2020

Materials

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In this study, a facile and low-cost method for biochar (CLB) preparation from vegetable waste (cauliflower leaves) was developed at a low temperature (120 °C) in the air atmosphere. The prepared mechanism, adsorption mechanism, and performance of CLB for Cu(II) and Pb(II) sorption were investigated using Scanning electron microscopy- energy dispersive X-ray spectroscopy(SEM-EDS), X-ray diffraction(XRD), Fourier transform infrared spectroscopy(FTIR), and a series of sorption experiments. Then the CLB was subjected to single and double element sorption studies to examine the effect of pH value on the Cu(II)/Pb(II) sorption capacities and then competitive sorption priority. There are both more hydroxyl (–OH) and carboxyl (–COOH) functional groups on the surface of CLB compared to those from control (without H3PO4 impregnation), resulting in more ion exchanges and complexation reaction for CLB with Cu(II) and Pb(II). Besides, the phosphorus-containing groups (e.g., P = OOH, P = O.), which newly formed with H3PO4 impregnation, could also enhance sorption, especially for Pb(II), this way leaded to its adsorption and precipitation as Pb5(PO4)3OH crystals. The performance of maximum adsorption capacities of CLB toward Cu(II) and Pb(II) were 81.43 and 224.60 mg/g, respectively. This sorption was slightly pH-dependent, except that the sorption capacity improved significantly as the pH value of the solution increased from 2 to 4. Competitive sorption experiment confirmed that Pb(II) had a higher sorption priority than Cu(II).

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Efficacy of spent tea waste as chemically impregnated adsorbent involving ortho-phosphoric and sulphuric acid for abatement of aqueous phenol—isotherm, kinetics and artificial neural network modelling

Cited by 21 publications

References 56 publications

Removal of levosulpiride from pharmaceutical wastewater using an advanced integrated treatment strategy comprising physical, chemical, and biological treatment

Removal of levosulpiride from pharmaceutical wastewater using an advanced integrated treatment strategy comprising physical, chemical, and biological treatment

Black Tea Waste as Green Adsorbent for Nitrate Removal from Aqueous Solutions

Facile Synthesis of Cauliflower Leaves Biochar at Low Temperature in the Air Atmosphere for Cu(II) and Pb(II) Removal from Water

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