Scholarlink

<p>The leather industry of West Bengal continuously discharges chromium-laden effluents, with hexavalent chromium [Cr(VI)] being particularly persistent and toxic. Hexavalent chromium released from tannery effluents poses serious environmental and public health hazards due to its high mobility, solubility, and carcinogenicity. Biosorption offers a sustainable and cost-effective alternative to conventional physicochemical remediation methods. In this study, the biosorption potential of <i>Bacillus cereus</i> F4810/72, a strain previously isolated from tannery wastewater, was systematically evaluated for Cr(VI) removal under varying physicochemical conditions. Batch experiments were conducted to investigate the influence of initial metal concentration (10–1000&#xa0;µg/mL), contact time (10–100&#xa0;min), pH (1–9), biomass concentration (1–4&#xa0;g/L), temperature (10–60&#xa0;°C), and agitation speed (10–120&#xa0;rpm) on biosorption efficiency. Maximum Cr(VI) removal (approximately 79–80%) was achieved under optimized conditions: 250&#xa0;µg/mL initial Cr(VI), 4&#xa0;g/L biomass, pH 3, 50&#xa0;°C, 70&#xa0;min contact time, and 80&#xa0;rpm agitation. Langmuir and Freundlich isotherm models were applied to elucidate adsorption behavior. Nonlinear Langmuir modeling indicated monolayer adsorption with a maximum capacity (Q<sub>max</sub>) of 28.57&#xa0;mg/g, whereas the Freundlich model (<i>R</i><sup>2</sup> = 0.98) suggested adsorption onto a heterogeneous surface. Regeneration studies showed that 2&#xa0;M HCl and a combined HNO₃–ascorbic acid eluent exhibited superior desorption efficiencies, maintaining high uptake–release performance across three cycles. Overall, <i>B. cereus</i> F4810/72 demonstrates strong Cr(VI) biosorption and regeneration potential, highlighting its viability as a low-cost, eco-friendly biosorbent for chromium-contaminated industrial wastewater systems.</p> Graphical Abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Biosorption-based elimination of hexavalent chromium using Bacillus cereus F4810/72 isolated from tannery effluents

  • 期刊论文

  • 发表日期：

    2025年12月23日

查看全文
  • Arghyadeep Bhattacharjee,
  • Debolina Chatterjee,
  • Sayan Poddar,
  • Tapti Sengupta,
  • Srabani Karmakar,
  • Arup Kumar Mitra,
  • Tanima Bhattacharya,
  • Shreyasee Roy,
  • Saheli Roy Chowdhury,
  • Khayali Das,
  • Kunal Mondal

摘要

The leather industry of West Bengal continuously discharges chromium-laden effluents, with hexavalent chromium [Cr(VI)] being particularly persistent and toxic. Hexavalent chromium released from tannery effluents poses serious environmental and public health hazards due to its high mobility, solubility, and carcinogenicity. Biosorption offers a sustainable and cost-effective alternative to conventional physicochemical remediation methods. In this study, the biosorption potential of Bacillus cereus F4810/72, a strain previously isolated from tannery wastewater, was systematically evaluated for Cr(VI) removal under varying physicochemical conditions. Batch experiments were conducted to investigate the influence of initial metal concentration (10–1000 µg/mL), contact time (10–100 min), pH (1–9), biomass concentration (1–4 g/L), temperature (10–60 °C), and agitation speed (10–120 rpm) on biosorption efficiency. Maximum Cr(VI) removal (approximately 79–80%) was achieved under optimized conditions: 250 µg/mL initial Cr(VI), 4 g/L biomass, pH 3, 50 °C, 70 min contact time, and 80 rpm agitation. Langmuir and Freundlich isotherm models were applied to elucidate adsorption behavior. Nonlinear Langmuir modeling indicated monolayer adsorption with a maximum capacity (Qmax) of 28.57 mg/g, whereas the Freundlich model (R2 = 0.98) suggested adsorption onto a heterogeneous surface. Regeneration studies showed that 2 M HCl and a combined HNO₃–ascorbic acid eluent exhibited superior desorption efficiencies, maintaining high uptake–release performance across three cycles. Overall, B. cereus F4810/72 demonstrates strong Cr(VI) biosorption and regeneration potential, highlighting its viability as a low-cost, eco-friendly biosorbent for chromium-contaminated industrial wastewater systems.

Graphical Abstract