| 棉秆与污泥共热解制备生物炭工艺优化及其结构与吸附性能 |
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| 引用本文： | 邓辉,李政家,金志文,张涛.棉秆与污泥共热解制备生物炭工艺优化及其结构与吸附性能[J].农业工程学报,2016,32(24):248-254. |
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| 作者姓名： | 邓辉 李政家 金志文 张涛 |
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| 作者单位： | 新疆兵团化工绿色过程重点实验室/石河子大学化学化工学院,石河子,832003 |
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| 基金项目： | 国家自然科学基金项目(51368051与51162024)石河子大学高层次人才科研启动资金专项(RCZX201204)；石河子大学杰出青年项目(2012ZRKX JQ-05)。 |
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| 摘 要： | 随着经济的发展,产量巨大的棉秆与污泥亟需找到新的资源化方式。该研究利用污泥与棉秆共热解制备炭,采用正交试验法全面考察与分析了各因素对污泥-棉秆炭吸附性能以及表面结构的影响。结果表明,污泥质量分数、KOH浓度、微波功率、辐照时间以及装填量均会显著影响污泥-棉秆炭的吸附性能、表面官能团以及孔结构。优化工艺参数为:污泥质量分数30%,微波功率280 W,辐照时间24 min,KOH质量分数50%,装填量150 g,在该工艺条件可制备获得综合吸附性能较优的污泥-棉秆炭,其亚甲基蓝、酸性品红、硫酸铜以及碘的吸附值分别达到157.80、293.39、272.12、1 281.93 mg/g。污泥-棉秆炭的吸附性能可达到或超过国家木质净水用活性炭一级品的标准,但吸附质与炭的结构特性均会影响其吸附性能。酸性官能团总量与孔容分别与酸性品红吸附值及硫酸铜吸附值显著相关,其他结构参数与吸附性能相关性不显著,污泥-棉秆炭对污染物的吸附并不只是单一的物理吸附或化学吸附。该研究结果对于定向设计高效的棉秆-污泥炭基吸附剂具有参考价值。
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| 关 键 词： | 废弃物 污泥 生物质 棉秆炭 吸附性能 KOH活化-微波热解法 表面结构 |
| 收稿时间： | 2015/12/16 0:00:00 |
| 修稿时间： | 2016/10/17 0:00:00 |
Process optimization of char prepared from co-pyrolysis of cotton stalk and sludge and analysis on its structure and adsorption capacity |
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| Deng Hui,Li Zhengji,Jin Zhiwen and Zhang Tao.Process optimization of char prepared from co-pyrolysis of cotton stalk and sludge and analysis on its structure and adsorption capacity[J].Transactions of the Chinese Society of Agricultural Engineering,2016,32(24):248-254. |
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| Authors: | Deng Hui Li Zhengji Jin Zhiwen and Zhang Tao |
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| Institution: | The Key Laboratory for Green Processing of Chemical Engineering, Xinjiang Production and Construction Corps/School of Chemistry and Chemical Engineering, Shihezi University, Shihezi 832003, China,The Key Laboratory for Green Processing of Chemical Engineering, Xinjiang Production and Construction Corps/School of Chemistry and Chemical Engineering, Shihezi University, Shihezi 832003, China,The Key Laboratory for Green Processing of Chemical Engineering, Xinjiang Production and Construction Corps/School of Chemistry and Chemical Engineering, Shihezi University, Shihezi 832003, China and The Key Laboratory for Green Processing of Chemical Engineering, Xinjiang Production and Construction Corps/School of Chemistry and Chemical Engineering, Shihezi University, Shihezi 832003, China |
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| Abstract: | Abstract: The production of sludge and cotton stalk arise along with the rapid development of China''s economy. Currently the most common methods for sludge and cotton stalk disposal are landfilling, incineration, and application in land in China. And incineration of cotton stalk may bring new air pollution problems; it may contaminate soils and ground water when sludge is used in land as fertilizer. Therefore, it is necessary to find an efficient way for the sludge and cotton stalk recycling. As alternative technology for the common sludge and cotton stalk treatment methods, the pyrolysis has been researched. But there are few researches on the effect of reaction conditions on surface structure properties of chars obtained from co-pyrolysis of sludge and biomass, as well as the research on the relationship between surface structure and adsorption properties. In this study, the pore structure properties (BET surface area, total pore volume and average pore width), the abundance of surface functional groups and the adsorption capacities of sludge and cotton stalk chars (SCA) were analyzed under 5 different reaction conditions. The reaction conditions included sludge content, concentration of KOH (potassium hydroxide) solution, radiation power, radiation time and loading amount. Chars were made from the mixtures of cotton stalk and sludge by microwave heating via KOH activation. The adsorption capacities of SCA were measured by removing methylene blue (MB), acid fuchsin (AF), iodine and copper sulphate (CuSO4) in aqueous solution. The correlations between the structure parameters and the adsorption capacities were calculated to test if the structure would affect the adsorption properties of chars. The results showed that all reaction conditions influenced the pore structure properties, and the abundance of surface chemical groups of chars significantly. On the same structure parameter, the effects of 5 conditions were not the same. For all pore or chemical structure parameters, each of these factors showed the influence with different capacities, and all the responses showed different trend with the change of condition levels. The adsorption capacity of SCA could reach the national stand of wooden activated carbon. All reaction conditions influenced the adsorption capacities to the MB and the CuSO4 significantly, but its influence on the adsorption capacities to AF and iodine was not significant. And for the same adsorption capacity, the reaction conditions showed different influence. The composite index, which was calculated by the adsorption capacity to MB, AF, iodine and CuSO4, was used to optimize the preparation process of the char, and the optimal parameters were as follows: the sludge content of 30%, the concentration of KOH solution of 50%, the radiation power of 280 W, the radiation time of 24 min and the loading amount of 150 g. The adsorption capacities of the SCA to MB, AF, iodine and CuSO4 obtained at the optimal parameters were 157.80, 293.39, 1281.93 and 272.12 mg/g, respectively. The effects of the reaction condition on composite index were as follows: load amount > radiation time > sludge content > radiation power > KOH concentration. The chemical and pore structure properties of the chars and the characteristics of the adsorbate influenced the adsorption properties of SCA significantly. The number of total acidic groups and total pore volume had significant correlation with the adsorption capacity to AF and CuSO4 respectively. But other single structure characteristic did not significantly correlate with the adsorption capacity of SCA. The adsorption of SCA to the pollutants is not a single physical adsorption or chemical adsorption. The research results can provide a reference for designing an effective adsorbent made from the SCA. |
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| Keywords: | wastes sludges biomass cotton stalk chars adsorption capacity potassium hydrate activation-microwave pyrolysis method structure properties |
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