Arsenic (As), a geogenic and extremely toxic metalloid can jeopardize terrestrial and aquatic ecosystems through environmental partitioning in natural soil-water compartment, geothermal and marine environments. Although, many researchers have investigated the decontamination potential of different mesoporous engineered bio sorbents for a suite of contaminants, still the removal efficiency of various pyrolyzed agricultural residues needs special attention. In the present study, rice straw derived biochar (RSBC) produced from slow pyrolysis process at 600 °C was used to remove As (V) from aqueous medium. Batch experiments were conducted at room temperature (25 ± 2 °C) under different initial concentrations (10, 30, 50, 100 μg L⁻¹), adsorbent dosages (0.5–5 μg L⁻¹), pH (4.0–10.0) and contact times (0–180 min). The adsorption equilibrium was established in 120 min. Adsorption process mainly followed pseudo–second order kinetics (R² ≥ 0.96) and Langmuir isotherm models (R² ≥ 0.99), and the monolayer sorption capacity of 25.6 μg g⁻¹ for As (V) on RSBC was achieved. Among the different adsorbent dosages and initial concentrations used in the present study, 0.2 g L⁻¹ (14.8 μg g⁻¹) and 100 μg L⁻¹ (13.1 μg g⁻¹) were selected as an optimum parameters. A comparative analysis of RSBC with other pyrolyzed waste materials revealed that RSBC had comparable adsorption ability (per unit area). These acidic groups are responsible for the electron exchange (electrostatic attraction, ion-exchange, π–π/n-πinteractions) with the anionic arsenate, which facilitates optimum removal (>60%) at 7 < pH < pH_PZC. The future areas of research will focus on decontamination of real wastewater samples containing mixtures of different emerging contaminants and installation of biofilter beds that contains different spent adsorbents/organic substrates (including biochar) for biopurification study in real case scenario.

砷（As）是一种具有地质毒性的剧毒准金属，可通过在自然土壤-水隔间，地热和海洋环境中进行环境划分来危害陆地和水生生态系统。尽管许多研究人员已经研究了不同介孔工程生物吸附剂对一系列污染物的去污潜能，但仍需要特别注意各种热解农业残留物的去除效率。在本研究中，使用稻草衍生的生物炭（RSBC），该炭是在600°C的缓慢热解过程中产生的，用于从水性介质中去除As（V）。批次实验在室温下进行（25℃±2℃）下不同初始浓度（10，30，50，100微克大号^-1），吸附剂的剂量（0.5-5微克大号^-1），pH（4.0-10.0）和接触时间（0-180分钟）。在120分钟内建立吸附平衡。吸附过程主要遵循准二级动力学（R ²  ≥0.96）和Langmuir等温模型（R ²  ≥0.99），和25.6微克克的单层吸附能力^-1对As（V）上RSBC达到了。在本研究中使用的不同吸附剂剂量和初始浓度中，0.2 g L ^-1（14.8μgg ^-1）和100μgL ^-1（13.1μgg ^-1选择）作为最佳参数。对RSBC与其他热解废料的比较分析表明，RSBC具有可比的吸附能力（每单位面积）。这些酸性基团负责与阴离子砷酸盐进行电子交换（静电吸引，离子交换，π–π /n-π相互作用），从而有助于在7 <pH <pH _PZC时最佳去除（> 60％）。未来的研究领域将集中在对包含不同新兴污染物混合物的真实废水样品进行去污染，以及安装包含不同废吸附剂/有机底物（包括生物炭）的生物滤床，以便在实际案例中进行生物纯化研究。