USE OF BIOCHAR AS WATER PURIFICATION SYSTEM IN WATERS CONTAMINATED BY HEAVY METALS

XXVIII Congress of the Analytical Chemistry Division

Bari, 22-26 September 2019

USE OF BIOCHAR AS WATER PURIFICATION SYSTEM

IN WATERS CONTAMINATED BY HEAVY METALS

M. Ginepro1_{, G. Costamagna}1_{, S. Mariot}1_{, C. Bezzi}1

marco.ginepro@unito.it - Deparment of Chemistry, University of Turin

Biochar is the final product of vegetable biomass pyrolysis and its use in agriculture allows the CO₂ removal from the atmosphere. Usually biochar is produced by pyrolysis at 550°C; in this work samples were achieved at temperatures ranging from 550 ° C to 1100 °C.

Biochar has a retaining heavy metals property and can be used for

water purification and land decontamination.

In the laboratory, 12 different plant essences of biochar were produced using a

tubular oven at a temperature of 550 °C, 800 °C and 1100 °C.

1g biochar + 50 ml at 2 mg/l

(Al, Cd, Cr, Cu, Mn, Ni, Pb, Zn)

buffer pH = 6

Metals still in solution analyzed with ICP-OES Stirring 24h-48h-72h Surnatant Separation 80.0 82.0 84.0 86.0 88.0 90.0 92.0 94.0 96.0 98.0 100.0

Metals absorption trend

Al 72 ore Cr 72 ore Cu 72 ore Pb 72 ore Zn 72 ore

A b b at m e n to % Abet e ro sso 1100 °C Cilie gio 1100 °C Fico 110 0 °C Gagg ia 1 100 °C Giug giol o 11 00 °C Gusc i noc ciole 110 0 °C Legn o no ccio lo 1 100 °C Noce 110 0 °C Prun o 11 00 °C Sam buco 110 0 °C Sega tura pio ppo 1100 °C Tuto lo m ais 1 100 °C Bioc har c omm ercia le Carb one atvo com mer ciale 0 10 20 30 40 50 60 70 80 90 100

Metal absorption trend

Cd 72 ore Mn 72 ore Ni 72 ore

A b a te m e n t % CONCLUSIONS

 Abatement increases with increasing pyrolysis temperature

 Abatement increases with contact time but also depends on the type of metal  The greatest abatements are obtained for Al, Cu, Pb and Zn

 Cd, Ni and Mn have lower abatement, more variable depending on the essences

chimica 24 h0 48 h 72 h 20 40 60 80 100 120 Al

Abete rosso 550 °C Abete rosso 800 °C Abete rosso 1100 °C

A b at e m e n t % Cd

Fico 550 °C Fico 800 °C Fico 1100 °C

A b at e m e n t % 24 h0 48 h 72 h 20 40 60 80 100 120 Cu

Noce 550 °C Noce 800 °C Noce 1100 °C

A b at e m e n t % 24 h0 48 h 72 h 10 20 30 40 50 60 70 80 Mn

Sambuco 550 °C Sambuco 800 °C Sambuco 1100 °C

A B at e m e n t % 24 h0 48 h 72 h 10 20 30 40 50 60 70 80 90 100 Ni

Fico 550 °C Fico 800 °C Fico 1100 °C

A b at e m e n t % 24 h0 48 h 72 h 20 40 60 80 100 120 Cr

Fico 550 °C Fico 800 °C Fico 1100 °C

A b at e m e n t %