NOPR Collection:

Optical and anti-oxidant application of zinc doped cadmium sulfide nanoparticle

2020-01-01T00:00:00Z

Title: Optical and anti-oxidant application of zinc doped cadmium sulfide nanoparticle Authors: Selvakumar, C; Deepa, M Abstract: Present work explains about optical and oxidant activity of zinc doped cadmium sulfide nanoparticle. Compare with undoped cadmium sulfide, zinc doped nanoparticles have different results in IR, SEM, TEM and XRD. EDAX image shows the crystalline arrangement of nanoparticles. Anti-oxidant activity describes using DHHP’s radical scavenging method and optical relation determine by Tauc’s equation. Page(s): 9-17

Experimental studies in antisolvent crystallization: Effect of antisolvent ratio and mixing patterns

2020-01-01T00:00:00Z

Title: Experimental studies in antisolvent crystallization: Effect of antisolvent ratio and mixing patterns Authors: Waval, Aniket S; Patel, Pooja; Nemade, Parag R; Mathpati, Channamallikarjun S Abstract: The crystals size and distribution play an important role in drug properties which has a major impact on the performance e.g., stability, solubility and bioavailability. The crystal size distribution (CSD) depends on the hydrodynamics and local degree of supersaturation in the crystallizer. In this study, we have investigated the effects of various operating conditions (antisolvent ratio, power, agitator design) using different mixing techniques such as impellers and ultrasound on CSD and average crystal size (ACS). It is found that mixing plays a dominant role in CSD and ACS. The hydrofoil (axial flow impeller) provides a wide range of ACS (406 to 240 μm) at lower power as compared to Rushton turbine (radial flow impeller) (395 to 375 μm). The mixed flow impeller produces the intermediate crystal size (365 to 345 μm). The increase in the antisolvent ratio results in a decrease in ACS. The same results observed for the power input. Page(s): 18-25

A low-cost adsorbent (wheat plant ash) prepared from agricultural waste for removal of paraquat from aqueous solutions

2020-01-01T00:00:00Z

Title: A low-cost adsorbent (wheat plant ash) prepared from agricultural waste for removal of paraquat from aqueous solutions Authors: Kamble, Manisha G; Trivedi, Nikhilesh S; Mandavgane, Sachin A Abstract: A low-cost adsorbent (wheat plant ash) has been prepared using a common agricultural waste (wheat straw) and its physicochemical characteristics, including chemical, physical, mineralogical, and morphological, and adsorption efficacy are investigated. WPA is characterized by SEM (scanning electron microscopy), CHNS(ultimate analysis) analysis, Brunauer–Emmett–Tellersurface area technique, and Fourier transform infrared method. The BET surface area of wheat plant ash was found to be 37 m²/g. To evaluate its adsorption capacity, paraquat is chosen as the adsorbate. Batch adsorption is performed by varying adsorbent dosage, initial concentration, and contact time. Experimental data are fitted to both kinetic and isotherm models. Pseudo-first-order and pseudo-second-order kinetic models are applied to experimental data, which indicated that the latter model had the best fit. Langmuir, Freundlich, Temkin, and Dubinin–Radushkevich isotherm models are then applied to the equilibrium data. The adsorption capacity of WPA for paraquat removal, determined using the Langmuir isotherm, is found to be approximately 241.3 mg/m² at 303 K. Page(s): 26-34

Groundnut plant ash: Characterisation and adsorption efficacy study for removal of paraquat dichloride

2020-01-01T00:00:00Z

Title: Groundnut plant ash: Characterisation and adsorption efficacy study for removal of paraquat dichloride Authors: Kamble, Manisha G; Deokar, Sunil K; Tajane, Sonali P; Mandavgane, Sachin A Abstract: For the first time combustion residue of agricultural waste i.e. groundnut plant is characterized in detail and explored as an adsorbent for removal of chlorinated herbicide, paraquat. The study investigates the chemical, physical, mineralogical, and morphological characteristics of GPA (Groundnut Plant Ash) adsorbent produced using groundnut plant. GPA has been characterized using the Fourier Transform Infrared (FTIR) spectroscopy to determine the functional groups, and Scanning Electron Microscopy (SEM) to examine the surface morphology of the carbon. Batch adsorption is performed by varying adsorbent dosage, initial concentration and contact time. Result shows that the kinetic models mainly the pseudo-second order and Elovich model had the best fit. The equilibrium data are analyzed using different isotherm models. The adsorption capacity of GPA for paraquat removal is found 265.71 mg/m²which is the highest reported value. Page(s): 35-42