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首页> 外文期刊>RSC Advances >High dispersions of nano zero valent iron supported on biochar by one-step carbothermal synthesis and its application in chromate removal
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High dispersions of nano zero valent iron supported on biochar by one-step carbothermal synthesis and its application in chromate removal

机译：通过一步式碳水合成的BioChar支持纳米零价铁的高分散体及其在铬酸盐去除中的应用

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摘要

A one-step carbothermal synthesis and characterization of biochar-supported nanoscale zero-valent iron (nZVI/BC) was performed for the removal of hexavalent chromium (Cr(vi)) from aqueous solution. High dispersions of nanoscale zero-valent iron supported on biochar were successfully synthesized by the pyrolysis of an iron-impregnated biomass (corn stover) as the carbon and iron source under nitrogen atmosphere. The effects of the pyrolytic temperature on the Fe mineralogies formed on the biochar are discussed. In general, the effects of the treatment time, initial solution pH, and nZVI/BC dosage on the Cr(vi) removal are presented. The results showed high crystallinity and purity, and nZVI/BC was obtained at a pyrolytic temperature of 800 degrees C. The batch experimental results determined that the adsorption capacity of Cr(vi) decreases with the increase in the initial pH value from 4.0 to 10.0. The Cr(vi) adsorption kinetics data effectively followed a pseudo-second-order kinetics with a calculated rate constant of 0.0.3396 g mg(-1) min(-1). The calculated thermodynamic parameters, such as G degrees, H degrees, and S degrees, were evaluated, and the results indicated that the Cr(vi) reduction on nZVI/BC was a spontaneous and endothermic process. The adsorption mechanism of Cr(vi) was investigated by XRD and XPS analyses and the results demonstrated that Cr(vi) was reduced to Cr(iii) and the oxidation of nZVI occurred during the reaction process. These results prove that nZVI/BC synthesized by a one-step carbothermal method can be considered as a potential candidate for the removal of Cr(vi) from aqueous solutions.
机译：用于从水溶液中除去六价铬（铬（VI））中进行生物炭支持的纳米尺度零价铁的一步法碳热合成和表征（的nZVI / BC）。支撑在生物炭纳米尺度零价铁的高分散体成功地由铁浸渍的生物质（玉米秸秆）的热分解为氮气氛下，碳和铁源合成。讨论在形成于生物炭中的Fe矿物学热解温度的影响。一般来说，处理时间，初始溶液的pH值，以及在Cr（VI）的去除率的nZVI / BC剂量的影响被呈现。结果表明高的结晶度和纯度，并在800℃热解温度制得的nZVI / BC将批料实验结果确定铬（VI）的吸附能力与从4.0到10.0的增加在初始pH值降低。的铬（VI）的吸附动力学数据有效，随后为0.0.3396克毫克计算速率常数的伪二阶动力学（-1）分钟（-1）。所计算出的热力学参数，如G度，H度，和S度，进行了评价，结果表明，上的nZVI / BC的铬（VI）还原为自发的吸热过程。铬（VI）的吸附机理是由XRD和XPS分析，结果表明，铬（VI）还原为Cr（III）和的nZVI的氧化反应过程中发生的。这些结果证明，通过一步法碳热法合成的nZVI / BC可以被认为是用于从水溶液中去除的Cr（VI）的潜在候选者。

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  • 来源
    《RSC Advances》 |2019年第22期|共8页
  • 作者

    Li Shifeng; You Tingting; Guo Yang; Yao Shuhua; Zang Shuyan; Xiao Min; Zhang Zhigang; Shen Yanming;

  • 作者单位

    Shenyang Univ Chem Technol Liaoning Engn Res Ctr Treatment &

    Recycling Ind D Shenyang 110142 Liaoning Peoples R China;

    Shenyang Univ Chem Technol Liaoning Engn Res Ctr Treatment &

    Recycling Ind D Shenyang 110142 Liaoning Peoples R China;

    Shenyang Univ Chem Technol Liaoning Engn Res Ctr Treatment &

    Recycling Ind D Shenyang 110142 Liaoning Peoples R China;

    Shenyang Univ Chem Technol Liaoning Engn Res Ctr Treatment &

    Recycling Ind D Shenyang 110142 Liaoning Peoples R China;

    Shenyang Univ Chem Technol Liaoning Engn Res Ctr Treatment &

    Recycling Ind D Shenyang 110142 Liaoning Peoples R China;

    Shenyang Univ Minist Educ Sch Environm Key Lab Reg Environm &

    Ecoremediat Shenyang 110044 Liaoning Peoples R China;

    Shenyang Univ Chem Technol Liaoning Prov Key Lab Chem Separat Technol Shenyang 110142 Liaoning Peoples R China;

    Shenyang Univ Chem Technol Liaoning Prov Key Lab Chem Separat Technol Shenyang 110142 Liaoning Peoples R China;

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