Tran Hai Nguyen, Tomul Fatma, Thi Hoang Ha Nguyen, Nguyen Dong Thanh, Lima Eder C, Le Giang Truong, Chang Chang-Tang, Masindi Vhahangwele, Woo Seung Han
Institute of Fundamental and Applied Sciences, Duy Tan University, Ho Chi Minh City 700000, Vietnam.
Burdur Mehmet Akif Ersoy University, Faculty of Arts and Science, Chemistry Department, 15100 Burdur, Turkey.
J Hazard Mater. 2020 Jul 15;394:122255. doi: 10.1016/j.jhazmat.2020.122255. Epub 2020 Feb 8.
In this study, we developed an innovative spherical biochar with high porosity and excellent paracetamol (PRC) adsorption capacity. The optimal pyrolysis temperatures for the preparation of spherical biochar (derived from pure glucose) and non-spherical biochar (from pomelo peel wastes) were obtained at 900 °C and 700 °C, respectively. Various advanced techniques were applied to characterize the prepared biochars. Spherical and non-spherical biochars exhibited large specific surface area (1292 and 1033 m/g) and high total pore volume (0.704 and 1.074 cm/g), respectively. The adsorption behavior of PRC onto two biochars was conducted utilizing batch experiments. Results demonstrated that the adsorption process was slightly affected by the change of solution pH (2-11) and addition of NaCl (0.05-1.0 M) and was able to achieve fast equilibrium (∼120 min). The maximum adsorption capacity of spherical biochar (286 mg/g) for PRC was approximately double that of non-spherical biochar (147 mg/g). The signal of thermodynamic parameters was negative ΔG° and ΔH° values, but positive ΔS° value. The adsorption mechanism consisted of pore-filling, hydrogen bonding formations, n-π and π-π interactions, and van der Waals force. The adsorption capacities of two biochars were insignificantly dependent on different real water samples containing PRC. Consequently, the biochars can serve as a green and promising material for efficiently removing PRC from water.
在本研究中，我们制备了一种具有高孔隙率和出色对乙酰氨基酚（PRC）吸附能力的创新性球形生物炭。制备球形生物炭（由纯葡萄糖制成）和非球形生物炭（由柚子皮废料制成）的最佳热解温度分别为900℃和700℃。采用了各种先进技术对制备的生物炭进行表征。球形和非球形生物炭的比表面积分别很大（1292和1033 m/g），总孔体积分别很高（0.704和1.074 cm/g）。利用分批实验研究了PRC在两种生物炭上的吸附行为。结果表明，吸附过程受溶液pH值变化（2-11）和NaCl添加量（0.05-1.0 M）的影响较小，且能快速达到平衡（约120分钟）。球形生物炭对PRC的最大吸附容量（286 mg/g）约为非球形生物炭（147 mg/g）的两倍。热力学参数的信号为负的ΔG°和ΔH°值，但为正的ΔS°值。吸附机制包括孔隙填充、氢键形成、n-π和π-π相互作用以及范德华力。两种生物炭的吸附容量对含有PRC的不同实际水样的依赖性不显著。因此，生物炭可作为一种绿色且有前景的材料，用于从水中高效去除PRC。
