Novel ball-milled biochar-vermiculite nanocomposites effectively adsorb aqueous As(Ⅴ).,Chemosphere

当前位置： X-MOL 学术 › Chemosphere › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Novel ball-milled biochar-vermiculite nanocomposites effectively adsorb aqueous As(Ⅴ).
Chemosphere ( IF 8.1 ) Pub Date : 2020-07-08 , DOI: 10.1016/j.chemosphere.2020.127566
Fang Li ₁ , Yongshan Wan ₂ , Jianjun Chen ₃ , Xin Hu ₄ , Daniel C W Tsang ₅ , Hailong Wang ₆ , Bin Gao ₇

Affiliation

Ball milling was used to fabricate a nanocomposite of 20% hickory biochar (600 °C) and 80% expanded vermiculite (20%-BC/VE). This novel composite adsorbent had much higher removal of As(V) from aqueous solutions than ball-milled biochar and expanded vermiculite. Characterization of these adsorbents showed that the enhanced As(V) adsorption was ascribed to much larger surface area and pore volume (2–6 times), notable changes in crystallinity, activation of cations, and increased functional groups in the nanocomposite compared with the ball-milled products of their pristine counterparts. The As(V) adsorption process by the 20%-BC/VE fitted well with the pseudo-second-order kinetic model (R² = 0.990) and Langmuir isotherm model (R² = 0.989) with a maximum adsorption capacity of 20.1 mg g⁻¹. The 20%-BC/VE best performed at pH about 6. The adsorption efficiency was not sensitive to the competition of $N O_{3}^{-}$ , $C l^{-}$ , $S O_{4}^{2 -}$ , as well as the coexistence of humic acid. However, the adsorption capacity for As(V) was significantly reduced by coexisting with $P O_{4}^{3 -}$ . The 20%-BC/VE composite can potentially serve as a superior low-cost adsorbent for As(V) removal in real-world applications.

中文翻译：

新型球磨生物炭-蛭石纳米复合材料可有效吸附含水As(Ⅴ)。

使用球磨制备 20% 山核桃生物炭 (600 °C) 和 80% 膨胀蛭石 (20%-BC/VE) 的纳米复合材料。与球磨生物炭和膨胀蛭石相比，这种新型复合吸附剂对水溶液中 As(V) 的去除率要高得多。这些吸附剂的表征表明，与球相比，纳米复合材料中的 As(V) 吸附增强归因于更大的表面积和孔体积（2-6 倍）、结晶度的显着变化、阳离子的活化以及官能团的增加- 原始同类产品的研磨产品。 20%-BC/VE对As(V)的吸附过程符合准二级动力学模型( R ² = 0.990 )和Langmuir等温线模型( R ² = 0.989 ),最大吸附容量为20.1 mg g ^-1 。 20%-BC/VE在pH值约为6时表现最佳。吸附效率对吸附剂的竞争不敏感。 $氮氧_{3}^{-}$ , $C 我^{-}$ , $S 氧_{4}^{2 -}$ ，以及腐殖酸的共存。然而，与As(V)共存时，As(V)的吸附能力显着降低。 $磷氧_{4}^{3 -}$ 。 20%-BC/VE 复合材料有可能成为实际应用中去除 As(V) 的优质低成本吸附剂。

更新日期：2020-07-13

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11