Heavy metal pollution is caused due to anthropogenic activities and is considered as a serious environmental problem which endangers human health and environment. The present study deals with biosorption, an eco-friendly technique for the removal of heavy metal Zn(II) from aqueous medium. Various natural materials have been explored for the uptake of metal ions, where most of them are physically or chemically enhanced. Dry cowdung powder (DCP) has been utilized as a low-cost, environmentally friendly humiresin without any pre-treatment, thus demonstrating the concept of Green Chemistry. Batch biosorption studies using ⁶⁵Zn(II) tracer were performed and the impact of different experimental parameters was studied. Results revealed that at pH 6, 94 ± 2% of Zn(II) was effectively biosorbed in 5 min, at 303 K. The process was spontaneous and exothermic, following pseudo-second-order reaction. The mechanism of heavy metal biosorption employing green adsorbent was therefore elucidated in order to determine the optimal method for removing Zn(II) ions. DCP has a lot of potential in the wastewater treatment industry, as seen by its ability to meet 3A's affordability, adaptability, and acceptability criteria. As a result, DCP emerges as one of the most promising challengers for green chemistry and the zero-waste idea.

重金属污染是人类活动造成的，被认为是危害人类健康和环境的严重环境问题。本研究涉及生物吸附，这是一种从水介质中去除重金属 Zn(II) 的环保技术。已经探索了各种天然材料来吸收金属离子，其中大多数是物理或化学增强的。干牛粪粉 (DCP) 已被用作低成本、环保的腐殖质，无需任何预处理，从而展示了绿色化学的概念。^使用65进行批量生物吸附研究进行了 Zn(II) 示踪剂，并研究了不同实验参数的影响。结果表明，在 pH 6 时，94 ± 2% 的 Zn(II) 在 303 K 的 5 分钟内被有效地生物吸附。该过程是自发的和放热的，遵循准二级反应。因此，阐明了采用绿色吸附剂进行重金属生物吸附的机理，以确定去除 Zn(II) 离子的最佳方法。DCP 在废水处理行业具有很大的潜力，这从其满足 3A 的可负担性、适应性和可接受性标准的能力可见一斑。因此，DCP 成为绿色化学和零浪费理念最有希望的挑战者之一。