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| 溶液初始pH值及裂解温度对玉米秸秆基生物炭吸附Cr(Ⅵ)的影响 |
| Impact of Initial pH and Pyrolysis Temperature on the Adsorption of Cr(Ⅵ) from Aqueous Solutions on Corn Straw-based Materials |
| Received:January 05, 2016 |
| DOI：10.13254/j.jare.2016.0006 |
| 中文关键词: 玉米秸秆;生物炭;Cr(Ⅵ);吸附;pH;裂解温度 |
| 英文关键词: corn straw;biochar;Cr(Ⅵ);adsorption;pH;pyrolysis temperature |
| 基金项目:国家级创新项目（201610019027） |
| Author Name | Affiliation | E-mail | | WANG Shuai | College of Resources and Environment, China Agricultural University, Beijing 100193, China | | | SHANG Jian-ying | College of Resources and Environment, China Agricultural University, Beijing 100193, China | jyshang@cau.edu.cn | | HU Ke-lin | College of Resources and Environment, China Agricultural University, Beijing 100193, China | | | WANG Bo | College of Resources and Environment, China Agricultural University, Beijing 100193, China | | | XU Dong-hao | College of Resources and Environment, China Agricultural University, Beijing 100193, China | | | YANG Wen | College of Resources and Environment, China Agricultural University, Beijing 100193, China | | | ZHENG Xiao-li | College of Resources and Environment, China Agricultural University, Beijing 100193, China | | | YAN Chao-rui | College of Resources and Environment, China Agricultural University, Beijing 100193, China | |
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| 中文摘要: |
| 以玉米秸秆为原料，在300、450℃和600℃下裂解得到3种生物炭，通过批处理实验讨论了溶液初始pH值和裂解温度对玉米秸秆及其生物炭吸附Cr（Ⅵ）的影响，并用吸附动力学模型和等温吸附模型对实验结果进行拟合。结果表明：对于同种吸附材料而言，溶液初始pH值越低，玉米秸秆及其生物炭对Cr（Ⅵ）的吸附量越大；当溶液初始pH值为3或5时，对Cr（Ⅵ）的吸附性能大小顺序为：玉米秸秆 > 生物炭300℃ > 生物炭450℃ > 生物炭600℃；当溶液初始pH=1时，对Cr（Ⅵ）的吸附性能大小顺序为：生物炭300℃ > 玉米秸秆 > 生物炭450℃ > 生物炭600℃，且生物炭300℃对Cr（Ⅵ）的最大吸附量约为141.24 mg·g-1。可见，溶液初始pH值越低，生物炭的裂解温度越低，越有利于生物炭对Cr（Ⅵ）的吸附。 |
| 英文摘要: |
| Batch experiments were performed on Cr(Ⅵ) adsorption using four straw-based materials including corn straw and three kinds of biochar pyrolysed at 300 ℃, 450 ℃ and 600 ℃, respectively. The results showed that the Cr(Ⅵ) adsorption were significantly affected by initial pH and pyrolysis temperature. The data were described by kinetic and isotherm models, and showed that the adsorption of Cr(Ⅵ) was increased with the decrease of initial pH. The removal rates of Cr(Ⅵ) were decreased with the increase of the pyrolysis temperature at pH=3 or pH=5. The biochar pyrolysed at 300 ℃ had the best capability of removing Cr(Ⅵ) from aqueous solution at pH=1, and the maxi-mum adsorption quantity was 141.24 mg·g-1 approximately. It observed that both the lower initial pH and the lower pyrolysis temperature had positive effects on the removal of Cr(Ⅵ) from aqueous solution. |
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