由玉米秸秆制备的木质素磺酸盐吸附剂对废水中 Pb 和 Cu 的吸附。
Adsorption of Pb and Cu in wastewater by lignosulfonate adsorbent prepared from corn straw.
机构信息
College of Environmental and Chemical Engineering, Chongqing Three Gorges University, Wanzhou, 404100 Chongqing, China.
Chongqing Wanzhou Sanfeng Environmental Protection Power Generation Co., LTD, Wanzhou, 404100 Chongqing, China.
出版信息
Int J Biol Macromol. 2023 Aug 30;247:125820. doi: 10.1016/j.ijbiomac.2023.125820. Epub 2023 Jul 13.
The heavy metal ions contained in industrial wastewater are a great threat to human health. Exploring a adsorbent which have low-cost, green environmental friendly, high adsorption capacity, good recycle is key to solve heavy metal ions pollution. Lignin sulfonate was obtained by treating corn stover, and then modified lignin sulfonate was obtained by hydrothermal method. The porous structure makes heavy metal ions occupy more internal adsorption sites. Modified lignosulfonate adsorbent efficiency removes heavy metals in wastewater especially Cu and Pb. The adsorption capacity of Cu on modified lignosulfonate is 450.3 mg g, Pb is 475.4 mg g. In addition, for 40 mg L Cu and Pb using 0.4 g L, the adsorption equilibrium is only reached within 60 min. Meanwhile, the removal ratio of Pb is 83 %, Cd is 72 %, Cu is 87 %, Zn is 36 %, Mn is 25 %, Cr is 95 %, and Fe is 99 % in wastewater using 0.4 g L adsorbent in 2 h. This research develops a practical adsorbent to remove heavy metals from actual wastewater.
工业废水中所含的重金属离子对人类健康是一个巨大的威胁。探索一种具有低成本、绿色环保、高吸附容量、良好可回收性的吸附剂是解决重金属离子污染的关键。通过处理玉米秸秆得到木质素磺酸盐，然后通过水热法得到改性木质素磺酸盐。多孔结构使重金属离子占据更多的内部吸附位。改性木质素磺酸盐吸附剂能有效去除废水中的重金属，尤其是 Cu 和 Pb。改性木质素磺酸盐对 Cu 的吸附容量为 450.3mg/g，Pb 的吸附容量为 475.4mg/g。此外，对于 40mg/L 的 Cu 和 Pb，使用 0.4g/L 的吸附剂，仅在 60min 内就达到吸附平衡。同时，在 2h 内，使用 0.4g/L 的吸附剂，废水中 Pb 的去除率为 83%，Cd 的去除率为 72%，Cu 的去除率为 87%，Zn 的去除率为 36%，Mn 的去除率为 25%，Cr 的去除率为 95%，Fe 的去除率为 99%。这项研究开发了一种实用的吸附剂，可用于去除实际废水中的重金属。
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