Alginate/Carboxymethylcellulose/Dex/MnO₂/g-C₃N₄ (Alg/CMC/Dex/MnO₂/g-C₃N₄) sol crosslinked with Ca²⁺ composite gel was synthesized by dissipative convective process followed by freeze drying process and characterized by Fourier transform infra red spectroscopy(FT-IR), Thermogravimetric analysis (TGA), Powder X-ray diffraction (PX-RD), Scanning electron microscopy (SEM), Atomic force microscopy (AFM), Brunauer-Emmett –Teller (BET) adsorption isotherm and Rheology. As synthesized composite was used electrochemical sensor for the detection of Cr(VI) by Cyclic Voltammetry in aqueous solutions over the range of 0.01 to 20.0 μg mL⁻¹ with a detection limit of 0.63 ng mL⁻¹ and 1.17 ng mL⁻¹ respectively. The rheological behavior of the gel Alg/CMC/Dex/MnO₂/g-C₃N₄/Ca showed elastic behavior dominating over viscous behavior with an increase of angular frequency sweep on account of showing gel like structures. The catalyst Alg/CMC/Dex/MnO₂/g-C₃N₄/Ca reduced Cr(VI) to Cr(III) just in 1.20 min. in presence of 0.01 M NaBH₄ which is due to its highest surface area among all as synthesized monoliths. The reduction of Cr (VI) became fast took only 26.63 s in presence of conc. H₂SO₄. The reaction kinetics became very fast when the catalyst amount is increased 0.006 g and the reaction cannot be measurable. The novelty of the catalyst Alg/CMC/Dex/MnO₂/g-C₃N₄/Ca is that it does not need any acid or base to reduce Cr(VI) to Cr(III) in a minimum time reported.

通过耗散对流，冷冻干燥的方法合成了Ca ²⁺复合凝胶交联的藻酸盐/羧甲基纤维素/ Dex / MnO ₂ / gC ₃ N ₄（Alg / CMC / Dex / MnO ₂ / gC ₃ N ₄）溶胶。傅里叶变换红外光谱（FT-IR），热重分析（TGA），粉末X射线衍射（PX-RD），扫描电子显微镜（SEM），原子力显微镜（AFM），Brunauer-Emmett –Teller（BET）吸附等温线和流变学。作为合成的复合材料，使用电化学传感器通过循环伏安法在0.01至20.0μgmL ^-1范围内的水溶液中检测Cr（VI）检测限分别为0.63 ng mL ^-1和1.17 ng mL ^-1。Alg / CMC / Dex / MnO ₂ / gC ₃ N ₄ / Ca凝胶的流变行为显示出弹性行为优于粘性行为，并且由于显示了类似凝胶的结构，因此角频率扫描增加。催化剂Alg / CMC / Dex / MnO ₂ / gC ₃ N ₄ / Ca仅在1.20分钟内就将Cr（VI）还原为Cr（III）。在0.01 M NaBH _4的存在下，这是由于在所有合成的整体料中其最大的表面积。在浓溶液存在下，Cr（VI）的还原速度很快，仅需26.63 s。H ₂ SO ₄。当催化剂量增加0.006g时，反应动力学变得非常快，并且反应无法测量。催化剂Alg / CMC / Dex / MnO ₂ / gC ₃ N ₄ / Ca的新颖之处在于，它不需要任何酸或碱就能在最短的时间内将Cr（VI）还原为Cr（III）。