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Dairy-Manure Derived Biochar Effectively Sorbs Lead and Atrazine

机译：乳制品衍生的生物炭有效地吸收铅和At去津

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摘要

Biochar (BC) produced from agricultural crop residues has proven effective in sorbing organic contaminants. This study evaluated the ability of dairy-manure derived biochar to sorb heavy metal Pb and organic contaminant atrazine. Two biochar samples were prepared by heating dairy manure at low temperature of 200 ℃ (BC200) and 350 ℃ (BC350). The untreated manure (BC25) and a commercial activated C (AC) were included as controls. Sorption of Pb by biochar followed a dual Langmuir-Langmuir model, attributing to Pb precipitation (84-87%) and surface sorption (13-16%). Chemical speciation, X-ray diffraction, and infrared spectroscopy indicated that Pb was precipitated as β-Pb_9(PO_4)_6 in BC25 and BC200 treatment, and as Pb_3(CO_3)_2(OH)_2 in BC350. Lead sorption by AC obeyed a single Langmuir model, attributing mainly to surface sorption probably via coordination of Pb d-electron to C=C (π-electron) and -O-Pb bonds. The biochar was 6 times more effective in Pb sorption than AC, with BC200 being the most effective (up to 680 mmol Pb kg~(-1)). The biochar also effectively sorbed atrazine where atrazine was partitioned into its organic phase, whereas atrazine uptake by AC occurred via surface sorption. When Pb and atrazine coexisted, little competition occurred between the two for sorption on biochar, while strong competition was observed on AC. Results from this study indicated that dairy manure can be converted into value-added biochar as effective sorbent for metal and/or organic contaminants.
机译：从农作物残留物中产生的生物炭（BC）已被证明可有效吸收有机污染物。这项研究评估了乳制品衍生生物炭吸收重金属Pb和有机污染物阿特拉津的能力。通过在200℃（BC200）和350℃（BC350）的低温下加热奶肥来制备两个生物炭样品。包括未处理的粪便（BC25）和商业活化的C（AC）作为对照。生物炭对Pb的吸附遵循Langmuir-Langmuir双重模型，归因于Pb的沉淀（84-87％）和表面吸附（13-16％）。化学形态，X射线衍射和红外光谱表明，在BC25和BC200处理中，Pb以β-Pb_9（PO_4）_6的形式沉淀，在BC350中以Pb_3（CO_3）_2（OH）_2的形式沉淀。 AC对铅的吸附遵循一个Langmuir模型，主要归因于表面吸附，可能是通过Pb d电子与C = C（π电子）和-O-Pb键的配位作用而引起的。生物炭对Pb的吸附效率是AC的6倍，而BC200最有效（高达680 mmol Pb kg〜（-1））。生物炭还有效吸附了at去津，其中at去津被分配到其有机相中，而AC吸收r去津则是通过表面吸附而发生的。当Pb和at去津共存时，两者之间几乎没有竞争吸附生物炭，而在AC上观察到强烈竞争。这项研究的结果表明，奶牛粪便可以转化为增值生物炭，作为金属和/或有机污染物的有效吸附剂。

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  • 来源
    《Environmental Science & Technology》 |2009年第9期|3285-3291|共7页
  • 作者

    XINDE CAO; LENA MA; BIN GAO; WILLIE HARRIS;

  • 作者单位

    School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China Soil and Water Science Department, University of Florida, Gainesville, Florida 32611;

    Soil and Water Science Department, University of Florida, Gainesville, Florida 32611;

    Agricultural and Biological Engineering Department, University of Florida, Gainesville, Florida 32611;

    Soil and Water Science Department, University of Florida, Gainesville, Florida 32611;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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