Division of Computational Physics, Institute for Computational Science, Ton Duc Thang University, Ho Chi Minh City, Viet Nam; Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Viet Nam.
Department of Academic Affairs and Testing, Dong Nai Technology University, Dong Nai, Viet Nam.
Environ Res. 2021 Sep;200:111492. doi: 10.1016/j.envres.2021.111492. Epub 2021 Jun 9.
Anionic Congo red dye (CR) is not effectively removed by conventional adsorbents. Three novel biochars derived from agro-waste (Acacia auriculiformis), modified with metal salts of FeCl, AlCl, and CaCl at 500 °C pyrolysis have been developed to enhance CR treatment. These biochars revealed significant differences in effluents compared to BC, which satisfied initial research expectations (P < 0.05). The salt concentration of 2 M realized optimal biochars with the highest CR removal of 96.8%, for AlCl-biochar and FeCl-biochar and 70.8% for CaCl-biochar. The modified biochars were low in the specific surface area (137.25-380.78 m g) compared normal biochar (393.15 m g), had more heterogeneous particles and successfully integrated metal oxides on the surface. The CR removal increased with a decrease in pH and increase in biochar dosage, which established an optimal point at an initial loading of 25 mg g. Maximum adsorption capacity achieved 130.0, 44.86, and 30.80 mg g for BFe, BCa, and BAl, respectively. As magnetic biochar, which is easily separated from the solution and achieves a high adsorption capacity, FeCl-biochar is the preferred biochar for CR treatment application.
阴离子刚果红染料（CR）不能被常规吸附剂有效去除。本研究开发了三种新型生物炭，由农业废弃物（相思树）制成，并用 FeCl、AlCl 和 CaCl 的金属盐在 500°C 热解改性，以增强 CR 的处理效果。与 BC 相比，这些生物炭在流出物中表现出显著差异，满足了初步研究的预期（P<0.05）。盐浓度为 2M 时，AlCl-生物炭和 FeCl-生物炭的 CR 去除率最高，达到 96.8%，CaCl-生物炭的去除率为 70.8%。改性生物炭的比表面积（137.25-380.78m²/g）低于普通生物炭（393.15m²/g），具有更多的异质颗粒，并成功地在表面集成了金属氧化物。CR 的去除率随着 pH 值的降低和生物炭用量的增加而增加，在初始负载为 25mg/g 时达到最佳点。BFe、BCa 和 BAl 的最大吸附容量分别达到 130.0、44.86 和 30.80mg/g。作为一种易于从溶液中分离并实现高吸附容量的磁性生物炭，FeCl-生物炭是 CR 处理应用的首选生物炭。
