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以酒糟生物碳为原料,采用负载Al(OH)_3改性制得生物吸附剂(CDGB)。通过静态吸附实验研究吸附剂用量、初始浓度、吸附时间、pH值和共存离子对CDGB吸附氟能力的影响。结果表明:CDGB具有非常宽的最适pH值范围,在pH值为5.0~9.0范围内CDGB均能有效地去除饮用水中的氟离子;并且在氟初始浓度为10 mg·L~(-1),吸附时间40 min,CDGB的添加量为2 g·L~(-1)时氟的去除率可达90%以上,且吸附后水中氟离子含量低于1 mg·L~(-1),符合国家饮用水标准;溶液中常见的共存离子(硝酸根、氯离子和硫酸根)对吸附剂吸附没有显著影响;CDGB对氟离子吸附过程符合Langmuir吸附等温线模型和伪二级吸附动力学模型,理论饱和吸附容量为18.05 mg·g~(-1)。
Biogas as carbonaceous material was used as raw material, and biosorbent (CDGB) was prepared by modification with Al (OH) 3. The effects of adsorbent dosage, initial concentration, adsorption time, pH value and coexisting ions on the adsorption capacity of fluorine on CDGB were investigated by static adsorption experiments. The results showed that CDGB had a very wide optimum pH range, and CDGB could effectively remove fluoride ions in drinking water at a pH range of 5.0-9.0. In the initial concentration of 10 mg · L -1 ), The adsorption time was 40 min, the removal rate of fluorine was more than 90% when the amount of CDGB added was 2 g · L -1, and the fluoride ion content in water after adsorption was less than 1 mg · L -1 , Which is in line with national drinking water standards. The common coexisting ions (nitrate, chloride and sulfate) in solution have no significant effect on the sorption of sorbent. The adsorption of fluoride on CDGB conforms to Langmuir adsorption isotherm model and pseudo-second-order sorption kinetics Model, theoretical saturated adsorption capacity of 18.05 mg · g ~ (-1).