Membrane and Separation Technology Division, CSIR- Central Glass and Ceramic Research Institute, 196, Raja S.C. Mullick Road, Kolkata, 700 032, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201 002, India.
Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201 002, India; Waste Re-processing Division, CSIR- National Environmental Engineering Research Institute, Nehru Marg, Nagpur, 440 020, India.
Environ Pollut. 2022 Nov 1;312:120056. doi: 10.1016/j.envpol.2022.120056. Epub 2022 Aug 29.
Effective immobilization of industrial waste into biochar development could be one of the most promising technologies for solid waste management to achieve circular economy. In this study, post-industrial cotton textile waste (PICTW), a cellulose rich industrial waste, was subjected to slow pyrolysis to develop a surface engineered biochar through phosphoric acid impregnation. Biochar produced at 500 °C designated as PICTWB500 showed a maximum methylene blue number (240 mg g) with remarkable specific surface area of 1498 m g. FESEM, FTIR, XRD and Raman spectra analysis were performed to investigate the surface texture and functionalities developed in the biochar. Adsorption efficiency of the biochar was assessed using drimarene red, blue, violet, and black dyes as model dye pollutants in batch mode at different biochar dose, pH and contact time. The maximum monolayer adsorption capacity was obtained in the range 285-325 mg g for different dyes, determined from Langmuir adsorption model. The kinetic behaviour was more favourable with the pseudo second-order model. The recycling ability of PICTWB500 was proven to be effective up to 6th cycle without compromising its adsorption efficiency significantly. This study demonstrated an excellent adsorption capability of the biochar in dye laden real textile effluent and recycling of spent biochar as a precursor of bio compost. Hence, this study established a dual win strategy for waste utilization in textile industry using a closed loop approach with substantial techno-economic feasibility that may have potential applications.
将工业废物有效固定在生物炭的开发中，可能是实现循环经济的固体废物管理最有前途的技术之一。在这项研究中，后工业棉纺织废物（PICTW），一种富含纤维素的工业废物，经过慢速热解，通过磷酸浸渍开发了一种表面工程生物炭。在 500°C 下生产的生物炭指定为 PICTWB500，其亚甲蓝值（240mg g）最高，比表面积达到 1498m g。通过 FESEM、FTIR、XRD 和拉曼光谱分析研究了生物炭的表面结构和功能。采用直接红染料、蓝色、紫色和黑色染料作为模型染料污染物，在不同的生物炭剂量、pH 和接触时间下，在批处理模式下评估了生物炭的吸附效率。从 Langmuir 吸附模型中确定，不同染料的最大单层吸附容量在 285-325mg g 范围内。动力学行为更符合准二级模型。证明 PICTWB500 的回收能力在第 6 次循环时仍然有效，而不会显著降低其吸附效率。本研究证明了生物炭在含有染料的实际纺织废水中具有优异的吸附能力，并可以回收用过的生物炭作为生物堆肥的前体。因此，本研究通过闭环方法，利用具有重大技术经济可行性的方法，为纺织工业废物利用建立了一个双赢的策略，具有潜在的应用前景。
