Showing papers on "Strychnos potatorum published in 2016"

Recovery and reuse of TiO 2 photocatalyst from aqueous suspension using plant based coagulant - A green approach

Abstract: Separation of TiO2 from aqueous suspension is a major constraint in heterogeneous photocatalytic water treatment. As an alternative for existing less effective immobilization techniques, the application of plant based coagulant for the recovery and reuse of TiO2 was investigated for the first time. Aqueous extract derived from seeds of Strychnos potatorum was found to be an effective coagulant for the sedimentation of TiO2. Further, the potential for recovery and reuse of the sedimented photocatalysts TiO2, was investigated by photocatalytic degradation of rhodamine B and terephthalic acid tests. The photocatalytic degradation experiments with recovered catalyst obey pseudo first-order kinetics with enhanced photocatalytic activity than that of the pure TiO2. The investigation of recovered catalysts with XRD, BET, SEM etc., suggests that there is no change in surface and morphological properties when compared with pure TiO2 and the recovered catalysts are highly suitable for recycle and reuse.

Adsorption of toxic Cr(VI) ions from aqueous solution by sulphuric acid modified Strychnos potatorum seeds in batch and column studies

Abstract: A new low-cost adsorbent such as sulphuric acid modified Strychnos potatorum seeds (SMSP) was employed for the removal of toxic Cr(VI) ions from aqueous solution in batch and column modes. Results showed that the removal of Cr(VI) ions could be effectively removed with the SMSP in batch operation. Adsorption of Cr(VI) ions onto SMSP followed the pseudo-first-order and Redlich–Peterson models in batch operation and Thomas model in column operation. Adsorption was more favourable at acidic pH of 2.0 with the maximum monolayer adsorption capacity of 202.7 mg/g. NaOH was a better desorbing agent with the recovery of 93.245% of Cr(VI) ions. Column studies were optimized with various parameters such as bed height (2–10 cm), Cr(VI) ions concentration (50–250 mg/L) and flow rate (5–25 mL/min). According to the fact that SMSP-based adsorption process could be a promising technology for the removal of Cr(VI) ions from wastewaters.

Potential of environmental-friendly, agro-based material Strychnos potatorum, as an adsorbent, in the treatment of paint industry effluent

Abstract: The study was focused on, to make use of the agro-based material Strychnos potatorum as an adsorbent, for the treatment of simulated water-based paint industry effluent (PIE) in a fixed-bed adsorption column (FBC). The influence of bed height, flow rate, and initial concentration of PIE were evaluated in terms of color removal efficiency. The highest color removal was achieved at a larger breakthrough time, and lengthier mass transfer zone was viewed at the lowest flow rate, lowest initial concentration, and highest bed height used in this study. For a successful design of a FBC, breakthrough curves were made and the experimental data were fitted using well-established models such as: Thomas/Bed depth service time (BDST), Adams–Bohart, Yoon–Nelson, and Wang. From the plot of these models, parameters like adsorption capacity and rate constants were calculated. Mass transfer models like Weber–Morris, Boyd, Urano–Tachkawa, and Mathews–Weber were applied to identify the rate-limiting step of the overa...

In Vitro Antibacterial activity and Phytochemical screening of Strychnos potatorum seed extract

Abstract: Biologically active compounds in plant extracts play an important role in herbal medicine through their antimicrobial properties. Strychnos potatorum belongs to the family Loganiaceae. The seed is primarily used in the Indian traditional systems for several treatments including microbial infections. It is used in Ayurveda for treating the eye and urinary tract infections and in Unani for gonorrhoea and kidney troubles ,leucorrhoea, tuberculosis, venereal diseases and in Siddha medicine for acute diarrhea. Present study was to determine the In Vitro antibacterial activity of different seed extracts of Strychnos potatorum and test for the presence of phytochemical constituents. Cold, hot and ethanol seed extracts of Strychnos potatorum were tested for In Vitro antibacterial activity against Staphylococcus aureus ATCC 25923, Pseudomonas aeruginosa ATCC 27853 , E coli ATCC 25922 and Enterococcus faecalis ATCC 29212 by using the standard agar well diffusion method. Distilled water and ethanol as solvent were used as control. Qualitative phytochemical analysis of extracts was also carried out for the presence of bioactive compounds using standard procedures. Results indicated that Cold, hot and ethanol extracts of Strychnos potatorum seed exhibited antibacterial activity among the tested bacteria. Cold seed extract failed to inhibit the growth of Staphylococcus aureus and Pseudomonas aeruginosa where as hot seed extract did not inhibit only the growth of Pseudomonas aeruginosa. But ethanol seed extract inhibited the growth of gram positive and all gram negative bacteria. Growth of Enterococcus faecalis(35.67±1.15) and E.coli (21.67±0.354)was significantly inhibited by ethanol seed extract rather than the growth of Staphylococcus aureus(16.24±0.653). Hot seed extract significantly inhibited the growth of Enterococcus faecalis(22.67±1.15). Phytochemical analysis indicated that Terpenoids and Saponins were present in all three extracts. Steroids and Flavanoids were only absent in hot extract. But ethanol extract contained all the tested phytochemical constituents. Further studies on sequential extraction and purification of antibacterial compounds in seeds could be developed.