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以秸秆生物炭为试验修复材料,采用矿区野外调查和室内吸附试验结合的方法,研究了溶液Cu~(2+)不同初始浓度、溶液pH、吸附时间及生物炭添加量下,秸秆生物炭对溶液中Cu~(2+)吸附作用的影响,并对秸秆生物炭的吸附性能进行测试,以期为修复草原铜矿区及周边污染提供参考依据。结果表明:秸秆生物炭的最佳吸附pH为4.5;吸附平衡时间为8h;相同吸附条件下当炭添加量为0.5g时,秸秆生物炭在溶液中Cu~(2+)浓度为512mg·L~(-1)时吸附量最大,为17.06mg·g~(-1)。因此,当矿区污染物中含量<512mg·L~(-1)时,吸附环境pH为酸性,添加0.5g秸秆生物炭,吸附8h,固定和吸附废水中的Cu~(2+)效果明显且节约成本。
Using straw biochar as the experimental material, the effects of straw biochar on the biodegradability of straw were studied using field investigation and indoor adsorption test in mining area. The effects of different concentrations of Cu 2+, solution pH, adsorption time and biochar addition were studied. Solution of Cu ~ (2+) adsorption effect, and straw biochar adsorption properties were tested in order to provide a reference for the restoration of grassland copper mining area and the surrounding pollution. The results showed that the optimum adsorption pH of straw biochar was 4.5 and the adsorption equilibrium time was 8h. Under the same adsorption conditions, when the amount of carbon added was 0.5g, the concentration of Cu 2+ in straw biochar was 512 mg · L ~ (-1), the maximum amount of adsorption was 17.06 mg · g ~ (-1). Therefore, when the content of pollutants in the mining area is less than 512mg · L -1, the pH value of the adsorption environment is acidic. Adding 0.5g straw biochar and adsorbing for 8h, the effect of Cu 2+ in the fixed and adsorbed wastewater is obvious save costs.