Impact of soybean stover- and pine needle-derived biochars on Pb and As mobility, microbial community, and carbon stability in a contaminated agricultural soil

Effect of bamboo and rice straw biochars on the mobility and redistribution of heavy metals (Cd, Cu, Pb and Zn) in contaminated soil

“…Although partly explored, the effects of biochar on mobility and bioavailability of heavy metals have been reported by others (Beesley et al, 2010;Fellet et al, 2011;Rizwan et al, 2015). To our understanding, limited research has been directed to determine the redistribution of multiple heavy metal contaminants in soils amended with different types of biochar (Ahmad et al, 2016a(Ahmad et al, , 2016b.…”

Integrating EDDS-enhanced washing with low-cost stabilization of metal-contaminated soil from an e-waste recycling site

“…The details were reported in our previous study (Ahmad et al, 2016b). The Brunauer-Emmett-Teller (BET) surface areas were 5.61 m 2 g À1 for BC300 and 420 m 2 g À1 for BC700, whereas the pH at 1:5 biochar/water suspension were 7.27 for BC300 and 11.32 for BC700, respectively.…”

“…It has been shown that Cu, Pb and Zn could be immobilized on the surface of the biochar via formation of surface complexes and precipitates, as well as ion exchange with oxygen-containing functional groups, carboxyl groups (-COOH) in particular (Uchimiya et al, 2011b;Rajapaksha et al, 2015). In addition, electrostatic attraction and cation-p electron donoracceptor interactions could occur on the graphene-like surface of biochar (Qiu et al, 2009;Zhang et al, 2015;Ahmad et al, 2016b). Moreover, precipitation of newly formed Pb-containing minerals (such as (Pb 5 (PO 4 ) 3 (OH))) was also identified as an immobilization pathway because of available phosphorus released from the biochar (Cao et al, 2011;Moon et al, 2013).…”

“…Biochar was shown to improve soil properties (soil aggregation, water holding capacity, nutrient availability and microbial activity), crop yield, and act as a carbon sink (Ahmad et al, 2016a;Hussain et al, 2016;Rizwan et al, 2016). The leachability of metals/metalloids, such as Cd, Cu, Pb, Zn, and As, was also proved to be significantly reduced (Cao et al, 2009;Uchimiya et al, 2011a;Lu et al, 2014;Ahmad et al, 2016b). Similarly, coal fly ash (CFA) produced from power generation was also found useful for stabilization of metal-contaminated soil because of its Fe-, Al-, and Ca-rich components (Komarek et al, 2013;.…”

Effects of Biochar and Marble mud on Mine Waste Properties to Reclaim Tailing Ponds

“…The same incubation temperature and time were stated by Ahmad et al . () using soil bean and pine derived biochar to remediate contaminated soils. The treatments were the mix of MW and: biochar from solid pig manure (PM), biochar from cotton ( Gossipium hirsutum L.) crop residues (CR), biochar from municipal solid waste, MM, PM + MM, CR + MM, MSW + MM and control without amendment.…”