碱改性污泥生物炭去除酸性矿山废水中的Cd(Ⅱ)  

Removal of Cd(Ⅱ)from acid mine wastewater using alkali modified sludge biochar

作　　者：杨江峰 许良全 李子建 张华 周记名 卢许佳 YANG Jiangfeng;XU Liangquan;LI Zijian;ZHANG Hua;ZHOU Jiming;LU Xujia(The 3th Engineering Co.,Ltd.,the Second Public Bureau of China Communications,Xi'an 710016,China;China Construction Eighth Engineering Bureau Co.,Ltd.,Shanghai 200135,China;China Railway 22th Bureau Group Co.,Ltd.,Beijing 100043,China;China Railway Sanju Group Bridge and Tunnel Engineering Co.,Ltd.,Chengdu 610000,China;China Civil Engineering Group Corporation,Beijing 100038,China;SINOHYDRO Bureau 7 Co.Ltd.,Chengdu 611730,China)

机构地区：[1]中交二公局第三工程有限公司,西安710016 [2]中国建筑第八工程局有限公司,上海200135 [3]中铁二十二局集团有限公司,北京100043 [4]中铁三局集团桥隧工程有限公司,成都610000 [5]中国土木工程集团有限公司,北京100038 [6]中国水利水电第七工程局有限公司,成都611730

出　　处：《矿冶》2025年第1期124-134,共11页Mining And Metallurgy

基　　金：四川省科技计划项目(2021YJ0033)。

摘　　要：采用NaOH溶液对原始污泥生物炭(SBC)进行改性,制备改性污泥生物炭(NSBC),并将其用于去除酸性矿山废水中的Cd(Ⅱ)。通过批量吸附试验,研究了溶液初始pH值、共存离子、吸附时间及初始浓度对Cd(Ⅱ)去除的影响,并探讨了去除Cd(Ⅱ)的潜在机理。结果表明,与原始污泥生物炭(SBC)相比,碱改性后的污泥生物炭(NSBC)表面多孔且含氧基团数量增加。NSBC在溶液pH值为4.0~7.0时对Cd(Ⅱ)的去除率保持在95%以上,且具有较强的抗离子干扰能力。SBC和NSBC对Cd(Ⅱ)的去除行为符合拟二级动力学模型和Langmuir模型。在投加量为0.5 g·L^(-1)、溶液pH值为4.0、温度为25℃的条件下,SBC和NSBC对Cd(Ⅱ)的饱和吸附量分别为67.44 mg·g^(-1)和196.62 mg·g^(-1)。NSBC对Cd(Ⅱ)的去除机理包括含氧基团的络合、矿物的溶解-沉淀及静电作用。NaOH solution was used to modify raw sludge biochar(SBC)to prepare modified sludge biochar(NSBC),which was then applied for the removal of Cd(Ⅱ)from acid mine drainage.Batch adsorption experiments were conducted to investigate the effects of initial solution pH,coexisting ions,adsorption time,and initial concentration on the removal of Cd(Ⅱ),as well as to explore the potential mechanisms of Cd(Ⅱ)removal from aqueous solutions.Compared to raw sludge biochar(SBC),the alkali-modified sludge biochar exhibited a more porous surface and an increased number of oxygen-containing functional groups.In contrast to SBC,NSBC maintained a Cd(Ⅱ)removal rate of over 95%at a solution pH range of 4.0–7.0 and demonstrated stronger resistance to ion interference.The Cd(Ⅱ)removal behaviors of both SBC and NSBC followed the pseudo-second-order kinetic model and the Langmuir isotherm model.At a dosage of 0.5 g·^(-1),a solution pH of 4.0,and a temperature of 25℃,the maximum adsorption capacities of SBC and NSBC for Cd(Ⅱ)were 67.44 mg·g^(-1) and 196.62 mg·g^(-1),respectively.The mechanisms of Cd(Ⅱ)removal by NSBC included complexation with oxygen-containing functional groups,dissolution-precipitation of minerals,and electrostatic interactions.

关 键 词：生物炭 NaOH改性 Cd(Ⅱ) 酸性矿山废水 吸附性能 潜在机理 

分 类 号：X703.1[环境科学与工程—环境工程]