160
S. Sahithya and C. Krishnaveni
the degradation process was terminated at 48 h (colorless state) (Vanaja et al. 2014;
Raina et al. 2020).
4 Discussion
Weeds are one of the most aggressive, troublesome and undesirable elements of
the world’s vegetation (Mahgoub et al. 2005). In the present study an attempt was
made to explore the potential application of the leaf extract of the weed to explore its
viability as an antimicrobial agent and make silver nanoparticles for dye degradation.
Present study shows that the acetone extract showed good anti-bacterial activity
against Bacillus subtilis and ethanol extract showed good anti-bacterial activity
against Pseudomonas putida than dist. water extract. The zone of inhibition was
higher against Pseudomonas putida (30 mm). The inhibitory effect increased with
increase in concentration of the extract. The positive control Streptomycin showed
the inhibitory effect against the bacteria (Nakano et al. 2004; Nutter et al. 2016).
Among the different solvent extracts from leaves of P. juliflora tested for antimicrobial activity only methanol extract showed significant anti-bacterial activity based on
the zone of inhibition in a diffusion assay (Zainal et al. 1988). The results of ethanol
fractions obtained from various parts of P. juliflora showed that the leaf, pod and
flower extracts were efficient in inhibiting growth of bacteria (Mohamedsham et al.
2010).
The change of the colour of the ethanol extract from green to reddish-brown was
observed in the present study. Colour of methanol extract changing from green to
reddish-brown was observed in the similar study carried out by (Arya et al. 2018)
on the synthesis of silver nanoparticles from the leaf extracts. The absorption bands
at 3367.86, 1634.74, 1393.63, 1057.04, 703.08 and 400.25 cm
−1 shows the presence of C = C–H Stretching, OH (water), t-butyl stretching, N–S Stretching, C–C
Deformation and S–S Stretching. The FTIR analysis revealed about 15 peaks representing the available functional groups within the Acetone extract of P. juliflora. The
major functional groups are alcohols, phenols, aromatics, alkyl halides, alkenes and
primary amines (Arya et al. 2018; Picariello et al. 2017).
The photocatalytic degradation potential of the nanoparticle can be observed from
the subsequent decrease of the absorbance value of dye. The percentage of degradation efficiency of silver nanoparticles was observed as 95.6% at 48 h (Table 2). The
degradation percentage was increased as increasing the exposure time of dye silver
nanoparticles (Vanaja et al. 2014; Raina et al. 2020).
5 Conclusion
The present study supports the view that, even a weed can be used for activities which
might make it a useful plant. The leaves extract of P. juliflora were found to be a
S. Sahithya and C. Krishnaveni
the degradation process was terminated at 48 h (colorless state) (Vanaja et al. 2014;
Raina et al. 2020).
4 Discussion
Weeds are one of the most aggressive, troublesome and undesirable elements of
the world’s vegetation (Mahgoub et al. 2005). In the present study an attempt was
made to explore the potential application of the leaf extract of the weed to explore its
viability as an antimicrobial agent and make silver nanoparticles for dye degradation.
Present study shows that the acetone extract showed good anti-bacterial activity
against Bacillus subtilis and ethanol extract showed good anti-bacterial activity
against Pseudomonas putida than dist. water extract. The zone of inhibition was
higher against Pseudomonas putida (30 mm). The inhibitory effect increased with
increase in concentration of the extract. The positive control Streptomycin showed
the inhibitory effect against the bacteria (Nakano et al. 2004; Nutter et al. 2016).
Among the different solvent extracts from leaves of P. juliflora tested for antimicrobial activity only methanol extract showed significant anti-bacterial activity based on
the zone of inhibition in a diffusion assay (Zainal et al. 1988). The results of ethanol
fractions obtained from various parts of P. juliflora showed that the leaf, pod and
flower extracts were efficient in inhibiting growth of bacteria (Mohamedsham et al.
2010).
The change of the colour of the ethanol extract from green to reddish-brown was
observed in the present study. Colour of methanol extract changing from green to
reddish-brown was observed in the similar study carried out by (Arya et al. 2018)
on the synthesis of silver nanoparticles from the leaf extracts. The absorption bands
at 3367.86, 1634.74, 1393.63, 1057.04, 703.08 and 400.25 cm
−1 shows the presence of C = C–H Stretching, OH (water), t-butyl stretching, N–S Stretching, C–C
Deformation and S–S Stretching. The FTIR analysis revealed about 15 peaks representing the available functional groups within the Acetone extract of P. juliflora. The
major functional groups are alcohols, phenols, aromatics, alkyl halides, alkenes and
primary amines (Arya et al. 2018; Picariello et al. 2017).
The photocatalytic degradation potential of the nanoparticle can be observed from
the subsequent decrease of the absorbance value of dye. The percentage of degradation efficiency of silver nanoparticles was observed as 95.6% at 48 h (Table 2). The
degradation percentage was increased as increasing the exposure time of dye silver
nanoparticles (Vanaja et al. 2014; Raina et al. 2020).
5 Conclusion
The present study supports the view that, even a weed can be used for activities which
might make it a useful plant. The leaves extract of P. juliflora were found to be a