XRD of the two samples heated at different temperatures is shown in Fig 2a . The initial hump around 19 o C is due to BMI. With rise in temperature there is diminishing of sharp peaks which is indicative of the fact that crystallinity is decreased. This may be due to production of excess amorphous carbon due to heating as well as flocculating property of aluminium sulphate which was also evident from the fact that the colour changes from greenish black to black with rise in temperature as reported previously [12]. The line profiles shown the larger crystallites formed because of coalescence of the crystallites are almost three times larger. The deconvolution (Gaussian) of the peaks were done (Fig ) and the specifications of the deconvoluted peaks are given in and 30.22672 n-a 24.04214 0.97807 0.04521 31.34237 n-a 26.84724 0.97268 0.05426 26.25946 n-a 29.02729 0.96809 0.03187 44.91619 n-a 30.97207 0.9637 41.44293 n-a 52.17283 0.89815 0.056 13.66248 27.55546 n-a 52.92297 0.89525 0.04098 37.77799 n-a 52.92297 0.89525 29.52308 0.51533 3.00425 a 55.14536 0.88644 0.01763 88.66993 n-a 57.12398 0.87832 0.41488 3.80351 a 58.46512 0.87266 0.02668 59.52569 nc 59.37121 0.86877 0.88165 0.01539 103.66654 nc 64.04304 0.84787 0.38689 0.00675 242.06102 nc