The scientific community is becoming increasingly interested in the production of activated carbon (AC) using pyrolyzed biomass wastes as potential sustainable precursors. Both chemical and physical methods may have a significant impact on the chemical and physical properties of AC, making it suitable for a variety of applications such as water pollution treatment, CO₂ capture, dye, and heavy metal (HM) removal, and energy storage. The properties of AC are significantly influenced by feedstock composition, pyrolysis conditions, and carbon activation parameters. In comparison to traditional AC, activated biochar appears to be a new potentially cost-effective, and environmentally friendly carbon material with a wide range of applications. Walnut is a well-known member of the Juglandaceae family. Walnut Shell (WS) is extremely tough and degrades very slowly, and the multiple synthesis procedures employ the shell to prepare AC. In this review article, a detailed list of products and different applications of AC from the WS is provided. The cited results explain the optimal conditions for an adsorption process, which include pH, adsorbent dosage, temperature, agitation speed, contact time, efficiency, adsorption capacity, fitting model, kinetics, and thermodynamics. In addition, it also describes the removal of a few organic compounds, and energy storage applications using parameters such as BET, different electrolytes, and specific capacitance.

科学界对利用热解生物质废物作为潜在的可持续前体生产活性炭（AC）越来越感兴趣。化学和物理方法都可能对AC的化学和物理性质产生重大影响，使其适用于多种应用，例如水污染处理、CO ₂捕获、染料和重金属（HM）去除以及能源存储。 AC 的性能受原料成分、热解条件和碳活化参数的显着影响。与传统活性炭相比，活性生物炭似乎是一种具有潜在成本效益的新型环保碳材料，具有广泛的应用前景。核桃是核桃科的著名成员。核桃壳（WS）非常坚韧，降解速度非常慢，多重合成程序利用核桃壳来制备AC。在这篇评论文章中，提供了 WS 的 AC 产品和不同应用的详细列表。引用的结果解释了吸附过程的最佳条件，包括 pH、吸附剂剂量、温度、搅拌速度、接触时间、效率、吸附容量、拟合模型、动力学和热力学。此外，它还描述了一些有机化合物的去除，以及使用 BET、不同电解质和比电容等参数的储能应用。