In this paper, pH sensitive superabsorbent hydrogel (Jh-g-AM-cl-NN′MBA) was designed from unexplored natural exudate of Lannea coromandelica (Houtt.) known as Jhingan gum or Odina gum or Jeol gum. The synthesized adsorbent was characterized by analytical techniques. Swelling studies carried out at different pH and temperature indicted that the hydrogel swelled maximum in alkaline and at high temperature. Batch adsorption was carried out to investigate the effect of initial dye concentration, adsorbent dosage, pH, agitation time and temperature. Adsorption data were fitted to various adsorption isotherms which were best explained by Langmuir isotherm (R2 = 0.997–0.999) with maximum adsorption capacity of 83 mg/g. The kinetic studies suggested that pseudo-second order (R2 = 0.996) well fitted the results. The feasibility of adsorption process determined thermodynamically suggested that adsorption process was endothermic and spontaneous. Moreover, the adsorbent displayed excellent regeneration capability and could be employed for dye removal upto five cycles of desorption–adsorption. The biodegradability of the adsorbent studied by soil burial method indicated that the material degraded completely in 180 days with a calculated half-life of 56 days. In sum, the synthesized adsorbent met all the desirable characters to be an excellent adsorbent.

中文翻译：

---

设计用于从水溶液中修复孔雀石绿染料的 Lannea coromandelica (Houtt) 渗出液的 pH 敏感低成本吸附剂

在本文中，pH 敏感的超吸收水凝胶 (Jh-g-AM-cl-NN'MBA) 是从被称为 Jhingan 胶或 Odina 胶或 Jeol 胶的 Lannea coromandelica (Houtt.) 的天然渗出液中设计的。通过分析技术表征合成的吸附剂。在不同 pH 值和温度下进行的溶胀研究表明，水凝胶在碱性和高温下溶胀最大。进行批量吸附以研究初始染料浓度、吸附剂用量、pH、搅拌时间和温度的影响。吸附数据适合各种吸附等温线，这最好由 Langmuir 等温线（R2 = 0.997-0.999）解释，最大吸附容量为 83 mg/g。动力学研究表明，伪二级 (R2 = 0.996) 很好地拟合了结果。从热力学上确定吸附过程的可行性表明吸附过程是吸热和自发的。此外，该吸附剂显示出优异的再生能力，可用于去除多达五个解吸-吸附循环的染料。通过土埋法研究的吸附剂的生物降解性表明，该材料在 180 天内完全降解，计算出的半衰期为 56 天。总之，合成的吸附剂满足所有理想的特性，是一种优良的吸附剂。通过土埋法研究的吸附剂的生物降解性表明，该材料在 180 天内完全降解，计算出的半衰期为 56 天。综上所述，合成的吸附剂符合作为优良吸附剂的所有理想特性。通过土埋法研究的吸附剂的生物降解性表明，该材料在 180 天内完全降解，计算出的半衰期为 56 天。总之，合成的吸附剂满足所有理想的特性，是一种优良的吸附剂。