Assessing the Efficiency and Mechanism of Copper Adsorption onto Biochars derived from Corn Straw and Cow Manure
Assessing the Efficiency and Mechanism of Copper Adsorption onto Biochars derived from Corn Straw and Cow Manure
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DOI：
10.1007/s11270-023-06385-7
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发表时间：
2023-06
期刊：
影响因子：
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通讯作者：
Qiao Xu;Chuanqi Xiong;Jialu Fan;Feifan Zhang;Jingjing Wang;Qiuyue Xu;Weiqin Yin;Shengsen Wang;Xiaozhi Wang
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文献类型：
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作者：
Qiao Xu;Chuanqi Xiong;Jialu Fan;Feifan Zhang;Jingjing Wang;Qiuyue Xu;Weiqin Yin;Shengsen Wang;Xiaozhi Wang
以不同农业废弃物（玉米秸秆和牛粪）为原料，研究了500 ℃热解生物炭（CSB 500和CMB 500）对溶液中Cu 2+的吸附效果和吸附机理。研究了吸附动力学、等温线拟合和pH效应，并对吸附前后的Cu 2+进行了表面表征。两种生物炭的吸附等温线均符合Langmuir吸附等温式，CMB 500对Cu 2+的最大吸附容量（78.63 mg g-1）高于CSB 500（73.77 mg g-1）。pH为6.0时，吸附量最大，CSB 500和CMB 500分别为21.24 mg g-1和24.28 mg g-1。两种生物炭对Cu ~（2+）的吸附机理不同。阳离子交换和矿物沉淀对CSB 500吸附Cu 2+的贡献率分别为43.5%和33.2%。CMB 500最重要的机制是矿物沉淀，贡献率为60.7%，这可能是由于CMB 500的高矿物组分容易与Cu 2+沉淀。相关性分析表明，生物炭的总Cu 2+去除量与矿物沉淀、pH、灰分、比表面积和全磷呈高度正相关。研究结果有助于根据生物炭的理化性质选择高效的生物炭材料，以更好地去除废水中的Cu 2+。
The adsorption efficiency and mechanism of Cu2+were qualitatively and quantitatively assessed in solution by biochar pyrolyzed at 500 ℃ (CSB500 vs. CMB500) using different agricultural wastes (corn straw vs. cow manure). The adsorption kinetic, isotherm fittings and pH effect were investigated and surface characterization was carried out before and after Cu2+adsorption. The Langmuir isotherm was the best fit for both biochars and CMB500 had a higher maximum Cu2+adsorption capacity (78.63 mg g–1) than CSB500 (73.77 mg g–1). The adsorption capacity reached the largest at pH 6.0 with 21.24 mg g–1for CSB500 and 24.28 mg g–1for CMB500. The adsorption mechanisms for Cu2+adsorption were different for the two biochars. Specifically, cation exchange and mineral precipitation contributed 43.5% and 33.2% for Cu2+adsorption by CSB500 respectively. The most important mechanism for CMB500 is mineral precipitation and the contribution is 60.7%, probably due to the high mineral components of CMB500 which are easily precipitated with Cu2+. The correlation analysis illustrated that total Cu2+removal capacity is highly positively correlated with mineral precipitation, pH, ash content, specific surface area and total P of biochar. The results benefit for selection of highly efficient biochar materials based on their physicochemical properties for better Cu2+removal from wastewaters.