Gourai Moumita, Nayak Ashok K, Nial Partha S, Satpathy Bijaylaxmi, Bhuyan Rajashree, Singh Saroj K, Subudhi Umakanta
Biochemistry & Biophysics Laboratory, CSIR-Institute of Minerals & Materials Technology Bhubaneswar 751 013 Odisha India
Academy of Scientific & Innovative Research (AcSIR) Ghaziabad 201002 Uttar Pradesh India.
RSC Adv. 2023 Feb 1;13(7):4340-4350. doi: 10.1039/d2ra07514h. eCollection 2023 Jan 31.
Anthropogenic activities accelerate fluoride contamination in groundwater, which largely affects public health. Though biochars have been explored for defluoridation, the plasma technology-based production of biochars has not received as considerable attention as other methods and it is also important that biochars be tested on groundwater samples. In the present study, for the first time, we report the preparation of biochars from different parts of using thermal plasma processing and demonstrate fluoride adsorption in both synthetic and contaminated groundwater. Water samples were collected from different locations in Nuapada district of Odisha such as Kotamal-Makardampada (20°24'46''N 82°37'19''E), Pandrapathar (20°34'41''N 82°39'25''E), Karlakot-Kadobhata (20°22'52''N 82°37'24''E), Kotamal-Jhakarpada (20°24'35''N 82°37'20''E), and Dohelpada (20°33'50''N 82°38'57''E). The leaf samples are processed at 1600 °C for 3 min in an inert atmosphere under a continuous flow of argon to get suitable biochars. The plasma-synthesized biochars contain larger exposed surfaces, which are efficient for the adsorption of fluoride. The prepared biochars were highly porous, amorphous, and contain > 72% carbon, which increases the efficiency of defluoridation due to the surface adsorbate site exposed. XRD of the samples showed the presence of calcium hydroxide, magnesium oxide, and calcium oxide, and large peaks of carbon. Raman data showed the double bond of carbon with oxygen in the form of carbonyl bonds, thioether, and sulfhydryl bonds, which contribute to the protonated site for the adsorption of fluoride, and assist in water penetration and swelling of biochars. The biochar of is very efficient for the adsorption of fluoride from standard samples as well as groundwater samples up to a concentration of 6 ppm. Conclusively, the present investigation shows that leaves are a good alternative adsorbent that could be used for the removal of fluoride from groundwater samples with > 85% removal in 18 h using 1 g biochar for 100 mL or 10 g biochar for 1 L water containing 4 ppm fluoride. To our knowledge, this is the first report on the thermal plasma-based production of biochars for the removal of fluoride from drinking water.
人为活动加速了地下水中的氟污染，这在很大程度上影响公众健康。尽管已对生物炭用于除氟进行了探索，但基于等离子体技术生产生物炭尚未像其他方法那样受到广泛关注，并且对生物炭在地下水样品上进行测试也很重要。在本研究中，我们首次报告了使用热等离子体处理从[植物名称]的不同部位制备生物炭，并展示了其在合成地下水和受污染地下水中的氟吸附情况。从奥里萨邦努阿帕达区的不同地点采集水样，如科塔马尔 - 马卡尔丹帕达（北纬20°24'46''，东经82°37'19''）、潘德拉帕塔尔（北纬20°34'41''，东经82°39'25''）、卡尔拉科特 - 卡多布哈塔（北纬20°22'52''，东经82°37'24''）、科塔马尔 - 贾卡帕达（北纬20°24'35''，东经82°37'20''）和多赫勒帕达（北纬20°33'50''，东经82°38'57''）。[植物名称]叶片样品在氩气连续流动的惰性气氛中于1600℃处理3分钟，以获得合适的生物炭。等离子体合成的生物炭具有更大的暴露表面，对氟的吸附效率高。制备的生物炭高度多孔、无定形，且碳含量>72%，由于表面吸附位点的暴露，提高了除氟效率。样品的X射线衍射显示存在氢氧化钙、氧化镁和氧化钙以及大的碳峰。拉曼数据显示碳与氧以羰基键、硫醚键和巯基键的形式存在双键，这些有助于形成氟吸附的质子化位点，并有助于生物炭的水渗透和膨胀。[植物名称]生物炭对标准样品以及浓度高达6 ppm的地下水样品中的氟吸附非常有效。总之，本研究表明，[植物名称]叶片是一种很好的替代吸附剂，可用于从地下水样品中去除氟，使用1 g生物炭处理100 mL含4 ppm氟的水或10 g生物炭处理1 L水，18小时内去除率>85%。据我们所知，这是关于基于热等离子体生产[植物名称]生物炭用于去除饮用水中氟的首次报道。
