The coating of the fibrous skeleton of luffa cylindrica (LC) with polyaniline (PANI) was carried out by in-situ polymerization of aniline. A thin PANI layer in its emeraldine-salt form (ES) got bound on to the LC surface, as revealed by the green color the latter developed, procuring more roughness to the luffa fibers. The surfaces of both materials, i.e. the purified original luffa (LC) and the PANI-coated luffa (PANI/LC) were characterized by FTIR, completed by the Raman range, SEM/EDX and XRD. In particular, the presence of N–H moieties in the FTIR spectrum and the appearance of the following bands: C = N stretching of the quinoid di-imine units, C = C stretching of the quinoid ring and C–N^.+ band of the radical-cation in the Raman spectrum confirmed the effectiveness of the coating of LC. Dedoping, as determined by solid addition method, completed at around pH 9.5. After characterization, PANI/LC was tested for its capacity to adsorb hexavalent chromium anionic species. First, the emergence of the chromium characteristic peak in the EDX spectrum brought experimental evidence for the effective sorption of chromium onto the PANI/LC surface. Then, the novel material displayed a high efficiency to retain the metallic pollutant, going up to ~ 300 mg.g⁻¹. Thus, after the PANI-grafting, this light and cheap agricultural by-product should compete advantageously with commercial anionic exchangers, at least in terms of efficiency. Besides, adsorption parameters were examined. The Cr(VI) uptake process was found to follow second order kinetics, with a pseudo-second order rate constant equal to 0.7144 × 10^–3 g.mg⁻¹.min⁻¹. At the lower end of concentrations, the adsorption efficiency decreased with increasing temperature. The computed thermodynamic parameters (namely ΔH°, ΔS° and ΔG°) indicate that adsorption is exothermic, with an unfavourable entropy change, and confirm its spontaneity. None of some classical models fitted the equilibrium sorption data, a result that expresses the sorption mechanism complexity.

聚苯胺（PANI）对丝瓜圆筒状（LC）纤维状骨架的包覆是通过苯胺的原位聚合进行的。呈翡翠盐形式（ES）的薄PANI层粘结在LC表面，绿色由后者显现出来，从而使丝瓜纤维更加粗糙。两种材料的表面，即纯化的原始丝瓜（LC）和涂有PANI的丝瓜（PANI / LC）的表面均通过FTIR进行了表征，该光谱由拉曼光谱仪，SEM / EDX和XRD完成。特别是在FTIR光谱中存在N–H部分，并出现以下谱带：C =醌二亚胺单元的N延伸，C =醌环和C–N的C延伸^。拉曼光谱中自由基阳离子的能带证实了LC涂层的有效性。通过固体添加方法确定的去掺杂在pH 9.5左右完成。表征后，测试PANI / LC吸附六价铬阴离子物质的能力。首先，EDX光谱中铬特征峰的出现为铬在PANI / LC表面上的有效吸附提供了实验证据。然后，这种新型材料表现出了很高的保留金属污染物的效率，高达〜300 mg.g ^-1。因此，在PANI接枝之后，至少在效率方面，这种轻质廉价的农业副产品应有利地与商业阴离子交换剂竞争。此外，检查了吸附参数。发现Cr（VI）的吸收过程遵循二级动力学，拟二级速率常数等于0.7144×10 ^–3  g.mg ^-1 .min ^-1。在较低的浓度下，吸附效率随温度升高而降低。计算的热力学参数（即ΔH°，ΔS°和ΔG°）表明吸附是放热的，熵变不利，并确认了其自发性。一些经典模型都不符合平衡吸附数据，该结果表达了吸附机理的复杂性。