Ba-modified peanut shell biochar (PSB): preparation and adsorption of Pb(II) from water

Abstract The impact of Ba-modified peanut shell biochar (Ba-PSB) on Pb(II) removal was studied and BaCl2 used as a modifier. It shown that the PSB obtained at 750 °C had best adsorption effect, Ba-PSB larger specific surface area good effect Pb(II). At pH = 5, concentration 400 mg/L, time 14 h, temperature 55 °C, loading amount black (BPSB), red (RPSB), Ba-BPSB, Ba-RPSB reached 128.050, 98.217, 379.330, 364.910 mg/g, respectively. In addition, based non-linear fitting, it found quasi-second-order kinetic model Redlich-Peterson isothermal could be applied to describe Ba-PSB. behavior unmodified modified spontaneous process. Moreover, chemical modification BPSB, RPSB, for hindering –COOH –OH groups revealed 81.81, 77.08, 86.90, 83.65% Pb(II), respectively, which due participation –COOH, while 17.61, 21.70, 12.77, 15.06% from group, increase cation strength (Na+, K+, Ca2+, Mg2+) will reduce capacity