Since last few years, climate change has been a serious concern all over the world. The concentrations of carbon dioxide (CO₂) in the atmosphere have been increasing at an alarming rate and this has been a key contributor to global warming and associated climate change. Hence, there is a global demand to reduce atmospheric CO₂ for balancing our climatic condition. Herein, we have synthesized cost-effective and environment-friendly chitosan grafted multi-walled carbon nanotubes (CSMWCNTs) based solid adsorbents for the capture of carbon dioxide as well as an efficient catalyst for its chemical fixation. Physical characterization of CSMWCNTs was done by fourier transformation infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscope (SEM) analysis, Brunauer-Emmett-Teller (BET) isotherm and thermogravimetric analysis (TGA). The CO₂ uptake capacity of CSMWCNTs was found to be significantly higher (1.92 ccg⁻¹) than that of pure chitosan but lower than functionalized multi-walled carbon nanotubes (10.20 ccg⁻¹). Moreover, it has been found that CSMWCNTs shows significant catalytic activity towards the chemical fixation of CO₂ with epoxides (propylene oxide and styrene oxide) and leading to the formation of corresponding cyclic carbonates. Cycloaddition of CO₂ with epoxides is one of the greenest approach to form high value added organic chemicals which have several applications as synthons in fine chemicals, petrochemicals, valuable intermediates, antifoam additives, engineering plastics and pharmaceuticals. Hence, to the best of our knowledge, for the first time capture and chemical fixation of CO₂ (at atmospheric pressure) by CSMWCNTs is being reported herein and which may help to reduce CO₂ gas from the atmosphere.

过去几年以来，气候变化一直是世界范围内的一个严重问题。大气中的二氧化碳（CO ₂）浓度以惊人的速度增加，这是导致全球变暖和相关的气候变化的关键因素。因此，存在减少大气中CO ₂的全球需求。平衡我们的气候条件。在这里，我们已经合成了具有成本效益和环境友好的壳聚糖接枝多壁碳纳米管（CSMWCNTs）为基础的固体吸附剂，用于捕获二氧化碳以及用于化学固定的有效催化剂。CSMWCNT的物理表征通过傅里叶变换红外光谱（FT-IR），X射线衍射（XRD），扫描电子显微镜（SEM）分析，Brunauer-Emmett-Teller（BET）等温线和热重分析（TGA）进行。发现CSMWCNTs的CO ₂吸收能力明显高于纯壳聚糖（1.92 ccg ^-1），但低于功能化的多壁碳纳米管（10.20 ccg ^-1）。）。此外，已经发现CSMWCNT对用环氧化物（环氧丙烷和苯乙烯氧化物）化学固定CO ₂表现出显着的催化活性，并导致形成相应的环状碳酸酯。CO ₂与环氧化物的环加成反应是形成高附加值有机化学品的最绿色方法之一，该有机化合物在精细化学品，石化产品，有价值的中间体，消泡添加剂，工程塑料和药品中作为合成子有多种应用。因此，据我们所知，本文首次报道了CSMWCNT捕获和化学固定CO ₂（在大气压下），这可能有助于减少大气中的CO ₂气体。