吸附
蒙脱石
结晶紫
溴化物
化学
溴化铵
热重分析
解吸
插层(化学)
亚甲蓝
水溶液
核化学
阳离子聚合
介孔材料
朗缪尔吸附模型
罗丹明B
无机化学
有机化学
肺表面活性物质
光催化
催化作用
病理
医学
生物化学
作者
El‐Refaie Kenawy,Ayman A. Ghfar,Saikh Mohammad Wabaidur,Moonis Ali Khan,Masoom Raza Siddiqui,Zeid A. ALOthman,Ayoub Abdullah Alqadami,Muhammad Hamid
标识
DOI:10.1016/j.jenvman.2018.04.121
摘要
Herein, Cetyltrimethyl ammonium bromide (CTAB) intercalated and branched polyhydroxystyrene (BPS) functionalized montmorillonite (MMT) nano-composite (BPS-CTAB-MMT) was developed, characterized, and its potential as an adsorbent was tested in sequestering cationic dyes viz. rhodamine B (RB), crystal violet (CV), and methylene blue (MB) from aqueous environment. N2 adsorption/desorption isotherm showed mesoporous BPS-CTAB-MMT surface with a BET surface area of 273.8 m2/g. The appearance of sharp spikes at 2855 and 2925 cm−1 (associated with symmetric and asymmetric tensions of C – H bonds) in infra-red spectrum of BPS-CTAB-MMT indicates successful intercalation of MMT with CTAB and functionalization with BPS. The observed crystallite size of BPS-CTAB-MMT was 66 nm. Comparatively greater weight loss for BPS-CTAB-MMT (11%) than MMT (9%) was observed during thermogravimetric analysis. The adsorption of dyes on BPS-CTAB-MMT was pH dependent with maximum uptake was observed in the pH range: 5–6. For initial dyes concentration (Co) range: 50–150 mg/L, the observed equilibration time for CV was 300 min, whereas for RB and MB the equilibration time varied between 300 and 360 min. Modeling investigations revealed the applicability of Sips isotherm and pseudo-second-order (PSO) kinetic models to dyes adsorption data. Sips maximum adsorption capacity (qs) values for RB, CV, and MB at 55 °C were 476.5, 438.7, and 432.7 mg/g, respectively. The adsorption of dyes on BPS-CTAB-MMT was thermodynamically favorable. Desorption studies showed 42.1% RB and 41.9% CV recovery with 0.1 M NaOH and CH3COCH3, respectively, while only traces of MB were recovered with tested eluents.
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